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  Subjects -> CHEMISTRY (Total: 845 journals)
    - ANALYTICAL CHEMISTRY (51 journals)
    - CHEMISTRY (595 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (595 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 24)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 244)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 51)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 56)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 15)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 21)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 27)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 203)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 219)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 4)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 310)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 118)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 91)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 4)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 14)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 72)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 24)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 20)
Chemical Reviews     Full-text available via subscription   (Followers: 183)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 58)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 146)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 20)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 258)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 17)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 61)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 3)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 3)
Environmental Chemistry     Hybrid Journal   (Followers: 7)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        1 2 3 | Last

Journal Cover Applied Surface Science
  [SJR: 0.93]   [H-I: 125]   [28 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0169-4332
   Published by Elsevier Homepage  [3051 journals]
  • Evaluation of nanoindentation load-depth curve of MEMS bridge structures
           by calculating the critical elastic-plastic bending deflections
    • Authors: Zhichao Ma; Hongwei Zhao; Xijie Du; Mingxing Zhou; Xiaoxi Ma; Changyi Liu; Luquan Ren
      Pages: 1 - 10
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Zhichao Ma, Hongwei Zhao, Xijie Du, Mingxing Zhou, Xiaoxi Ma, Changyi Liu, Luquan Ren
      This paper proposes a correction method to accurately evaluate the nanoindentation load-depth (P-h) curve of MEMS double clamped micro bridge structures. Critical elastic and plastic deflections of the bent bridge are extracted from the overall elastic-plastic deflection, respectively. Through subtracting the elastic-plastic deflection of the micro bridge from the total displacement of the Berkovich indenter’s tip, the effect of constraint condition (double clamped) on the P-h curve of micro bridge is corrected. Nanoindentation P-h curves of routine and micro bridge C11000 Cu specimens are respectively obtained and compared with each other through both finite element analysis and experiments. Meanwhile, cross-sectional profiles along the symmetry axis of local indentation locations respectively obtained from the nodal deformations and scanned images of routine and micro bridge specimens are also compared and explained. Furthermore, a theoretical model is proposed to analyze the effect of the equivalent flow area induced by the elastic-plastic deflection on maximum indentation depth, the corrected values of Young’s modulus, maximum and residual depths of micro bridge specimens are essentially in agreement with that of routine fixed specimens.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.106
      Issue No: Vol. 434 (2017)
       
  • Strong efficiency improvement in dye-sensitized solar cells by novel
           multi-dimensional TiO2 photoelectrode
    • Authors: Fengyang Zhao; Rong Ma; Yongjian Jiang
      Pages: 11 - 15
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Fengyang Zhao, Rong Ma, Yongjian Jiang
      Titanium dioxide (TiO2) based dye-sensitized solar cells (DSSCs) often exhibit superior power conversion performance. Here we report a DSSC with novel hierarchical TiO2 composite structure (TCS) composed of anatase TiO2 micro-spheres and rutile TiO2 nanobelt framework by hydrothermal approach for high-performance. As photoanode, the TCS based DSSC shows a strong efficiency enhancement by 58% compared with Degussa TiO2 (P25)-DSSC (4.33%). The excellent performance is mainly attribute to its special multi-dimensional structures of TiO2: much active sites of 0D nanoparticle with exposed excellent {001} facet, special electronic transmission channel of 1D nanobelt, good dye adsorption capacity of 2D nanosheet and high light scattering ability of 3D micro-spheres. The novel multi-dimensional TCS materials will open up a new avenue to the electronic devices fields.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.131
      Issue No: Vol. 434 (2017)
       
  • Novel ultrathin Bi2O3 nanowires for supercapacitor electrode materials
           with high performance
    • Authors: Yongfu Qiu; Hongbo Fan; Xueyi Chang; Haifeng Dang; Qun Luo; Zhiyu Cheng
      Pages: 16 - 20
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Yongfu Qiu, Hongbo Fan, Xueyi Chang, Haifeng Dang, Qun Luo, Zhiyu Cheng
      In this paper, the ultrathin Bi2O3 nanowires are synthesized by an oxidative metal vapor transport deposition technique. Their diameters and length are about 10nm and several tens of micrometers, the growth direction is along [101] and the specific surface area is about 7.34m2 g−1. The galvanostatic charge-discharge measurement results show that the specific capacitances of the Bi2O3 nanowires-based electrodes increase with the decrease of the current densities. The maximum capacitance is 691.3Fg−1 at the current density of 2.0Ag−1. The Ragone plot shows that the Bi2O3 nanowires has excellent supercapacitive performance. Moreover, the cyclic stability is measured by the galvanostatic charge/discharge technique at a constant current density of 10.0Ag−1 in 6.0M KOH electrolyte. The results show the excellent capacitance retention of 75.5% over 3000 cycles. In a word, the Bi2O3 nanowires should be the ideal potential electrode materials for low-costing and effective electrochemical supercapacitors.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.171
      Issue No: Vol. 434 (2017)
       
  • Friction-induced nano-structural evolution of graphene as a lubrication
           additive
    • Authors: Jun Zhao; Junyuan Mao; Yingru Li; Yongyong He; Jianbin Luo
      Pages: 21 - 27
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Jun Zhao, Junyuan Mao, Yingru Li, Yongyong He, Jianbin Luo
      Graphene has attracted enormous attention in the field of lubrication based on its excellent physical and chemical properties. Although many studies have obtained thermally or chemically- exfoliated graphene and investigated their wide and important application, few studies have reported their physical nano-structural evolution under friction. In this study, we investigated the lubrication properties of graphene additives with different layer numbers and interlayer spacing by exfoliating. The additives with a higher degrees of exfoliation changed to ordering under friction, and had better lubrication properties, while that with a lower degrees exhibited obvious structural defects and high friction. Therefore, the original degrees of exfoliation plays a key role in the structural evolution of graphene and superior lubrication can be achieved through the physical nano-structure changing to ordering, even graphitization. Furthermore, the ordered tribofilm on the frictional interfaces was parallel to the sliding direction, meaning the highly exfoliated graphene indeed reaching slippage between its layers, which wasn’t experimentally discovered in previous studies. This work provides a new understanding of the relationship between friction-induced nano-structural evolution and lubrication properties of graphene as a lubrication additive, and has great potential for the structural design of graphene as a lubrication additive.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.119
      Issue No: Vol. 434 (2017)
       
  • Insight into the effect of promoter Co on C2 oxygenate formation from
           syngas on CoCu(100) and Cu(100): A comparative DFT study
    • Authors: Xuanyu Sun; Yingzhe Yu; Minhua Zhang
      Pages: 28 - 39
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Xuanyu Sun, Yingzhe Yu, Minhua Zhang
      Density functional theory calculations have been employed to investigate the effect of promoter Co on C2 oxygenate formation from syngas on pure Cu(100) and two kinds of Co-Cu bimetallic surfaces. Based on the results of previous studies that CH3O is a key intermediate in ethanol formation on Cu catalyst, five reactions starting from CH3O were taken into consideration. Different from the results on Cu(100) that CH3OH is the most favorable product on pure Co sites, CH3 formation is more favorable both kinetically and thermodynamically than CH3OH formation, which leads to more CH3 available for CHO insertion to form C2 oxygenates. On the other hand, Co-Cu bimetallic sites can facilitate CHO insertion into CH3 energetically, which is favorable for carbon chain growth. And the addition of Co can make the barrier of CH3 hydrogenation and CH3 coupling to CH4 and CH3CH3 higher, making CH3CHO much more selective than hydrocarbons. In conclusion, by introducing Co into Cu catalyst, the productivity and selectivity of C2 oxygenate precursor of ethanol can be effectively improved. The optimum Co-Cu catalyst should contain Cu ensembles and Co ensembles with proper sizes, and offer enough Co-Cu bimetallic sites at the same time.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.164
      Issue No: Vol. 434 (2017)
       
  • Atomic-scale finishing of carbon face of single crystal SiC by combination
           of thermal oxidation pretreatment and slurry polishing
    • Authors: Hui Deng; Nian Liu; Katsuyoshi Endo; Kazuya Yamamura
      Pages: 40 - 48
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Hui Deng, Nian Liu, Katsuyoshi Endo, Kazuya Yamamura
      Single-crystal silicon carbide (4H-SiC) has a range of useful physical, mechanical and electronic properties that make it a promising material for fabrication of next-generation semiconductor devices. In this work, we report a hybrid polishing process combining thermal oxidation pretreatment and soft abrasive polishing to realize the damage-free and atomic-scale smooth finishing of the carbon face of 4H-SiC. By thermal oxidation pretreatment, the hardness of the carbon face has been reduced from 4.6GPa to 1.7GPa, which enables highly efficient polishing using CeO2 slurry. For conventional CeO2 slurry polishing without pretreatment, scratches still existed after a long polishing duration for 16h. The probable scratch removal mechanism in CeO2 slurry polishing has been proposed based on surface morphology changes during polishing. Whereas a scratch-free surface with well-ordered SiC atomic steps was obtained within a short polishing duration of only 3h when polishing was conducted on a thermally oxidized surface. Our results demonstrate that hybrid polishing combining surface pretreatment and soft abrasive polishing is a promising approach to realize the damage-free and atomic-scale smooth finishing of the carbon face of 4H-SiC.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.159
      Issue No: Vol. 434 (2017)
       
  • Porous worm-like NiMoO4 coaxially decorated electrospun carbon nanofiber
           as binder-free electrodes for high performance supercapacitors and
           lithium-ion batteries
    • Authors: Xiaodong Tian; Xiao Li; Tao Yang; Kai Wang; Hongbao Wang; Yan Song; Zhanjun Liu; Quangui Guo
      Pages: 49 - 56
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Xiaodong Tian, Xiao Li, Tao Yang, Kai Wang, Hongbao Wang, Yan Song, Zhanjun Liu, Quangui Guo
      The peculiar architectures consisting of electrospun carbon nanofibers coaxially decorated by porous worm-like NiMoO4 were successfully fabricated for the first time to address the poor cycling stability and inferior rate capability of the state-of-the-art NiMoO4-based electrodes caused by the insufficient structural stability, dense structure and low conductivity. The porous worm-like structure endows the electrode high capacitance/capacity due to large effective specific surface area and short electron/ion diffusion channels. Moreover, the robust integrated electrode with sufficient internal spaces can self-accommodate volume variation during charge/discharge processes, which is beneficial to the structural stability and integrity. By the virtue of rational design of the architecture, the hybrid electrode delivered high specific capacitance (1088.5Fg−1 at 1Ag−1), good rate capability (860.3Fg−1 at 20Ag−1) and long lifespan with a capacitance retention of 73.9% after 5000 cycles when used as supercapacitor electrode. For lithium-ion battery application, the electrode exhibited a high reversible capacity of 1132.1mAhg−1 at 0.5Ag−1. Notably, 689.7mAhg−1 can be achieved even after 150 continuous cycles at a current density of 1Ag−1. In the view of their outstanding electrochemical performance and the cost-effective fabrication process, the integrated nanostructure shows great promising applications in energy storage.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.09.153
      Issue No: Vol. 434 (2017)
       
  • A facile method to prepare dual-functional membrane for efficient oil
           removal and in situ reversible mercury ions adsorption from wastewater
    • Authors: Qingdong Zhang; Na Liu; Yingze Cao; Weifeng Zhang; Yen Wei; Lin Feng; Lei Jiang
      Pages: 57 - 62
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Qingdong Zhang, Na Liu, Yingze Cao, Weifeng Zhang, Yen Wei, Lin Feng, Lei Jiang
      In this work, a novel thiol covered polyamide (nylon 66) microfiltration membrane was fabricated by combining mussel-inspired chemistry and coupling reaction, which owns excellent dual-function that can simultaneously remove oil from water efficiently and adsorb the mercury ions contained in the wastewater reversibly. Such membrane exhibited high oil/water separation efficiency, outstanding mercury adsorption ability, and good stability. Moreover, it can be regenerated in nitric acid solution, and maintain its good adsorption performance. The as-prepared membrane showed great potentials for water purification to reduce the heavy metal ion pollution and complicated industrial oily wastewater and living wastewater.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.09.230
      Issue No: Vol. 434 (2017)
       
  • Electrochemical corrosion characteristics and biocompatibility of
           nanostructured titanium for implants
    • Authors: Jinwen Lu; Yong Zhang; Wangtu Huo; Wei Zhang; Yongqing Zhao; Yusheng Zhang
      Pages: 63 - 72
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Jinwen Lu, Yong Zhang, Wangtu Huo, Wei Zhang, Yongqing Zhao, Yusheng Zhang
      In the present study, a nano-grained (NG) surface layer on a commercial pure (Grade-2) titanium sheet was achieved by means of sliding friction treatment. The surface characteristics, in vitro corrosion behavior and biocompatibility of NG Ti were investigated, compared with those of the conventional coarse-grained (CG) substrate. The protective passive film on NG Ti surface is thicker than that on CG Ti, leading to its enhanced biological corrosion resistance in simulated body fluid (SBF) solution. In addition, NG Ti shows a much higher hydrophilicity and nano-roughness, which is related to its significantly improved cell attachment, spreading, proliferation and maturation relative to CG Ti. The enhanced biological anti-corrosion properties and biocompatibility render NG Ti a promising biomaterial for implants.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.168
      Issue No: Vol. 434 (2017)
       
  • Inherent wettability of different rock surfaces at nanoscale: a
           theoretical study
    • Authors: Xiao Chang; Qingzhong Xue; Xiaofang Li; Jianqiang Zhang; Lei Zhu; Daliang He; Haixia Zheng; Shuangfang Lu; Zilong Liu
      Pages: 73 - 81
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Xiao Chang, Qingzhong Xue, Xiaofang Li, Jianqiang Zhang, Lei Zhu, Daliang He, Haixia Zheng, Shuangfang Lu, Zilong Liu
      Investigating the inherent wettability of rock surfaces at nanoscale is of great importance in ore floatation and oil recovery field. Using molecular dynamics simulations, we systematically study the wetting behavior of water on different rock surfaces (silica, calcite, gypsum, halite and graphite) at nanoscale. It is demonstrated that the inherent rock wettability follows the order of gypsum>calcite>halite>silica>graphite. Remarkably, we also manifest that the polarity of oil molecules can affect the water contact angles on silica surface. For example, the water contact angles on silica surface in hexane, dodecane, thiophene and toluene are 58±2°, 63±3°, 90±1°, 118±1°, respectively. Furthermore, we investigate the wetting behavior of water on heterogeneous rock surfaces and find that water molecules can move from hydrophobic surface to hydrophilic surface.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.173
      Issue No: Vol. 434 (2017)
       
  • The performance of manganese-based catalysts with Ce0.65Zr0.35O2 as
           support for catalytic oxidation of toluene
    • Authors: Zhongyan Hou; Jie Feng; Tao Lin; Hailong Zhang; Xiaoying Zhou; Yaoqiang Chen
      Pages: 82 - 90
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Zhongyan Hou, Jie Feng, Tao Lin, Hailong Zhang, Xiaoying Zhou, Yaoqiang Chen
      Mesoporous Ce0.65Zr0.35O2 composites are synthesized by co-precipitation method and a series of novel MnOx/Ce0.65Zr0.35O2 monolithic catalysts with different content of manganese oxides are prepared for toluene catalytic oxidation. The results show that the catalytic activity of Ce0.65Zr0.35O2 is promoted by introduction of manganese and influenced remarkably by the amount of MnOx. In particular, the catalyst with 15wt.% MnOx loading performs best activity in view of the lowest complete conversion temperature of 250°C at a GHSV of 12000h−1. According to the characterizations of N2 adsorption-desorption, XRD, SEM-EDX, H2-TPR, O2-TPD and XPS analyses, the superior catalytic activity could be attributed to the well-dispersed MnOx species, good low-temperature redox property, more Mn4+ species and more available surface and lattice oxygen species. Additionally, the optimized catalyst shows high stability during the thermal aging experiment and long-term testing experiment, and it also shows a good activity under the condition of high gas hourly space velocity, which presents a well application prospect.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.09.048
      Issue No: Vol. 434 (2017)
       
  • Surface quality and topographic inspection of variable compliance part
           after precise turning
    • Authors: P. Nieslony; G.M. Krolczyk; S. Wojciechowski; R. Chudy; K. Zak; R.W. Maruda
      Pages: 91 - 101
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): P. Nieslony, G.M. Krolczyk, S. Wojciechowski, R. Chudy, K. Zak, R.W. Maruda
      The paper presents the problem of precise turning of the mould parts with variable compliance and demonstrates a topographic inspection of the machined surface quality. The study was conducted for the cutting tools made of cemented carbide with coatings, in a range of variable cutting parameters. The long shaft with special axial hole, made of hardened 55NiCrMoV6 steel was selected as a workpiece. The carried out study included the stiffness measurement of the machining system, as well as the investigation of cutting force components. In this context, the surface topography parameters were evaluated using the stylus profile meter and analysed. The research revealed that the surface topography, alongside the 3D functional parameters, and PSD influences the performance of the machined surface. The lowest surface roughness parameters values, equalled to Sa =1μm and Sz =4.3μm have been obtained during turning with cutting speed vc =90 m/min. The stable turning of variable compliance part affects the surface texture formation with a unidirectional perpendicular, anisotropic structure. Nevertheless, in case of unstable turning, the characteristic chatter marks are observed, and process dynamics has greater contribution in formation of surface finish than turning kinematics and elastic plastic deformation of workpiece.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.158
      Issue No: Vol. 434 (2017)
       
  • Advanced interface modelling of n-Si/HNO3 doped graphene solar cells to
           identify pathways to high efficiency
    • Authors: Jing Zhao; Fa-Jun Ma; Ke Ding; Hao Zhang; Jiansheng Jie; Anita Ho-Baillie; Stephen P. Bremner
      Pages: 102 - 111
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Jing Zhao, Fa-Jun Ma, Ke Ding, Hao Zhang, Jiansheng Jie, Anita Ho-Baillie, Stephen P. Bremner
      In graphene/silicon solar cells, it is crucial to understand the transport mechanism of the graphene/silicon interface to further improve power conversion efficiency. Until now, the transport mechanism has been predominantly simplified as an ideal Schottky junction. However, such an ideal Schottky contact is never realised experimentally. According to literature, doped graphene shows the properties of a semiconductor, therefore, it is physically more accurate to model graphene/silicon junction as a Heterojunction. In this work, HNO3-doped graphene/silicon solar cells were fabricated with the power conversion efficiency of 9.45%. Extensive characterization and first-principles calculations were carried out to establish an advanced technology computer-aided design (TCAD) model, where p-doped graphene forms a straddling heterojunction with the n-type silicon. In comparison with the simple Schottky junction models, our TCAD model paves the way for thorough investigation on the sensitivity of solar cell performance to graphene properties like electron affinity. According to the TCAD heterojunction model, the cell performance can be improved up to 22.5% after optimizations of the antireflection coatings and the rear structure, highlighting the great potentials for fabricating high efficiency graphene/silicon solar cells and other optoelectronic devices.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.163
      Issue No: Vol. 434 (2017)
       
  • Facile synthesis of NiS anchored carbon nanofibers for high-performance
           supercapacitors
    • Authors: Jinling Xu; Li Zhang; Guancheng Xu; Zhipeng Sun; Chi Zhang; Xin Ma; Chunling Qi; Lu Zhang; Dianzeng Jia
      Pages: 112 - 119
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Jinling Xu, Li Zhang, Guancheng Xu, Zhipeng Sun, Chi Zhang, Xin Ma, Chunling Qi, Lu Zhang, Dianzeng Jia
      Transition metal sulfide compounds with carbon materials are promising for high-performance supercapacitors. Carbon nanofibers (CNFs) wrapped with NiS nanoparticles were herein obtained through electrospinning and calcination. NiS nanoparticles in composite nanofibers are covered by a layer of graphitic carbon, which not only increase the conductivity but also provide active regions for nanoparticle growth to prevent aggregation. The CNFs-NiS electrode has high specific capacity of 177.1mAhg−1 at 1Ag−1 (0.41mAhcm−2 at a current density of 2.3mAcm−2) and long-term cycling stability, with 88.7% capacitance retention after 5000 cycles. The excellent electrochemical activity may be attributed to the accessible specific surface, unique porous structure of CNFs and high specific capacitance of NiS. In addition, the asymmetric supercapacitor has an enhanced volumetric energy density of 13.32 mWh cm−3 at a volumetric power density of 180mWcm−3 and high cycling stability, with 89.5% capacitance retention after 5000 cycles. It also successfully lights up a light-emitting diode. The CNFs-NiS composite has significant potential applications in supercapacitor.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.09.233
      Issue No: Vol. 434 (2017)
       
  • Nanosecond laser ablated copper superhydrophobic surface with tunable
           ultrahigh adhesion and its renewability with low temperature annealing
    • Authors: An He; Wenwen Liu; Wei Xue; Huan Yang; Yu Cao
      Pages: 120 - 125
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): An He, Wenwen Liu, Wei Xue, Huan Yang, Yu Cao
      Recently, metallic superhydrophobic surfaces with ultrahigh adhesion have got plentiful attention on account of their significance in scientific researches and industrial applications like droplet transport, drug delivery and novel microfluidic devices. However, the long lead time and transience hindered its in-depth development and industrial application. In this work, nanosecond laser ablation was carried out to construct grid of micro-grooves on copper surface, whereafter, by applying fast ethanol assisted low-temperature annealing, we obtained surface with superhydrophobicity and ultrahigh adhesion within hours. And the ultrahigh adhesion force was found tunable by varying the groove spacing. Using ultrasonic cleaning as the simulation of natural wear and tear in service, the renewability of superhydrophobicity was also investigated, and the result shows that the contact angle can rehabilitate promptly by the processing of ethanol assisted low-temperature annealing, which gives a promising fast and cheap circuitous strategy to realize the long wish durable metallic superhydrophobic surfaces in practical applications.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.143
      Issue No: Vol. 434 (2017)
       
  • Sensing performance of reduced graphene oxide-Fe doped WO3 hybrids to NO2
           and humidity at room temperature
    • Authors: Carlo Piloto; Mahnaz Shafiei; Hareem Khan; Bharati Gupta; Tuquabo Tesfamichael; Nunzio Motta
      Pages: 126 - 133
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Carlo Piloto, Mahnaz Shafiei, Hareem Khan, Bharati Gupta, Tuquabo Tesfamichael, Nunzio Motta
      Gas sensors operating at room temperature have been fabricated from hybrid films of reduced graphene oxide (rGO) and iron doped (Fe-doped) WO3. Films with different rGO layer thicknesses (1–44nm) obtained by vacuum filtration method were deposited on to a 250nm thick sputtered Fe-doped WO3 film. Raman, XPS and SEM were used to investigate the morphology and composition of the films. The sensors were tested towards different concentrations of NO2 and relative humidity (RH%) at different temperatures ranging from 25°C to 100°C. The experimental results revealed that the highest response of the hybrid gas sensors towards these target gases is found to be for rGO layer thickness of 16nm at room temperature. The sensing mechanisms of the hybrid films for different temperatures and rGO layer thickness were discussed based on the behaviour of the sensors towards the target gases.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.152
      Issue No: Vol. 434 (2017)
       
  • A high efficient nanostructured filter based on functionalized carbon
           nanotube to reduce the tobacco-specific nitrosamines, NNK
    • Authors: Mehdi Yoosefian
      Pages: 134 - 141
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Mehdi Yoosefian
      Filtration efficiency of Pd and Ni loaded single-walled carbon nanotubes via the applicability of the adsorption process for the removal NNK, the tobacco-specific nitrosamines, from tobacco smoke were investigated using first-principles calculations. The thermal and mechanical stability of designed nanostructured filter could allow them to compete with typical commercially used. It is expected that the removal efficiency of the proposed nanostructured filter could also provide a promising adsorbent candidate in removing the environmental pollutant. The suggested separation mechanism in this study was discussed with frontier molecular orbital theory, natural bond orbital (NBO) analyses and the density of states in the density functional theory framework. Finally, by the Bader theory of atoms in molecules (AIM), the topological properties of the electron density contributions for intermolecular and intramolecular interactions has been analyzed. Calculations show that the transition metal-loaded SWCNT exhibit strong affinity toward the NNK molecules.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.166
      Issue No: Vol. 434 (2017)
       
  • Investigation of anodic TiO2 nanotube composition with high spatial
           resolution AES and ToF SIMS
    • Authors: Alexey Dronov; Ilya Gavrilin; Elena Kirilenko; Daria Dronova; Sergey Gavrilov
      Pages: 148 - 154
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Alexey Dronov, Ilya Gavrilin, Elena Kirilenko, Daria Dronova, Sergey Gavrilov
      High resolution Scanning Auger Electron Spectroscopy (AES) and Time-of-Flight Secondary Ion Mass-Spectrometry (ToF SIMS) were used to investigate structure and elemental composition variation of both across an array of TiO2 nanotubes (NTs) and single tube of an array. The TiO2 NT array was grown by anodic oxidation of Ti foil in fluorine-containing ethylene glycol electrolyte. It was found that the studied anodic TiO2 nanotubes have a layered structure with rather sharp interfaces. The differences in AES depth profiling results of a single tube with the focused primary electron beam (point analysis) and over an area of 75μm in diameter of a nanotube array with the defocused primary electron beam are discussed. Depth profiling by ToF SIMS was carried out over approximately the same size of a nanotube array to determine possible ionic fragments in the structure. The analysis results show that the combination of both mentioned methods is useful for a detailed analysis of nanostructures with complex morphology and multi-layered nature.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.132
      Issue No: Vol. 434 (2017)
       
  • Graphene quantum dots modified with adenine for efficient two-photon
           bioimaging and white light-activated antibacteria
    • Authors: Zhimin Luo; Dongliang Yang; Chen Yang; Xiangyang Wu; Yanling Hu; Ying Zhang; Lihui Yuwen; Edwin Kok Lee Yeow; Lixing Weng; Wei Huang; Lianhui Wang
      Pages: 155 - 162
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Zhimin Luo, Dongliang Yang, Chen Yang, Xiangyang Wu, Yanling Hu, Ying Zhang, Lihui Yuwen, Edwin Kok Lee Yeow, Lixing Weng, Wei Huang, Lianhui Wang
      A simple two-step microwave-assisted method was developed for the preparation of adenine-modified graphene quantum dots (A-GQDs) with striking fluorescence properties. The prepared A-GQDs with the lateral size of 3–5nm and single- to few-layer thickness exhibit intense fluorescence with a quantum yield of 21.63% (excited at 350nm) and an average lifetime of 4.47ns. The A-GQDs are biocompatible and present two-photon green fluorescence, which render them suitable for two-photon fluorescent cell imaging. More interestingly, we demonstrate for the first time that the A-GQDs also possess white light-activated antibacterial property. Due to their excellent photoluminescence performance and ease of biological conjugation, A-GQDs can be envisioned as an emerging role for many multifunctional biomedical applications.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.121
      Issue No: Vol. 434 (2017)
       
  • Novel proton exchange membranes based on structure-optimized poly(ether
           ether ketone ketone)s and nanocrystalline cellulose
    • Authors: Chuangjiang Ni; Yingcong Wei; Qi Zhao; Baijun Liu; Zhaoyan Sun; Yan Gu; Mingyao Zhang; Wei Hu
      Pages: 163 - 175
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Chuangjiang Ni, Yingcong Wei, Qi Zhao, Baijun Liu, Zhaoyan Sun, Yan Gu, Mingyao Zhang, Wei Hu
      Two sulfonated fluorenyl-containing poly(ether ether ketone ketone)s (SFPEEKKs) were synthesized as the matrix of composite proton exchange membranes by directly sulfonating copolymer precursors comprising non-sulfonatable fluorinated segments and sulfonatable fluorenyl-containing segments. Surface-modified nanocrystalline cellulose (NCC) was produced as the “performance-enhancing” filler by treating the microcrystalline cellulose with acid. Two families of SFPEEKK/NCC nanocomposite membranes with various NCC contents were prepared via a solution-casting procedure. Results revealed that the insertion of NCC at a suitable ratio could greatly enhance the proton conductivity of the pristine membranes. For example, the proton conductivity of SFPEEKK-60/NCC-4 (SFPEEKK with 60% fluorenyl segments in the repeating unit, and inserted with 4% NCC) composite membrane was as high as 0.245Scm−1 at 90°C, which was 61.2% higher than that of the corresponding pure SFPEEKK-60 membrane. This effect could be attributed to the formation of hydrogen bond networks and proton conduction paths through the interaction between −SO3H/–OH groups on the surface of NCC particles and −SO3H groups on the SFPEEKK backbones. Furthermore, the chemically modified NCC filler and the optimized chemical structure of the SFPEEKK matrix also provided good dimensional stability and mechanical properties of the obtained nanocomposites. In conclusion, these novel nanocomposites can be promising proton exchange membranes for fuel cells at moderate temperatures.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.09.094
      Issue No: Vol. 434 (2017)
       
  • Adsorption of DNA/RNA nucleobases onto single-layer MoS2 and Li-Doped
           MoS2: A dispersion-corrected DFT study
    • Authors: Meisam Sadeghi; Mohsen Jahanshahi; Morteza Ghorbanzadeh; Ghasem Najafpour
      Pages: 176 - 187
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Meisam Sadeghi, Mohsen Jahanshahi, Morteza Ghorbanzadeh, Ghasem Najafpour
      The kind of sensing platform in nano biosensor plays an important role in nucleic acid sequence detection. It has been demonstrated that graphene does not have an intrinsic band gap; therefore, transition metal dichalcogenides (TMDs) are desirable materials for electronic base detection. In the present work, a comparative study of the adsorption of the DNA/RNA nucleobases [Adenine (A), Cytosine (C) Guanine (G), Thymine (T) and Uracil (U)] onto the single-layer molybdenum disulfide (MoS2) and Li-doped MoS2 (Li-MoS2) as a sensing surfaces was investigated by using Dispersion-corrected Density Functional Theory (D-DFT) calculations and different measure of equilibrium distances, charge transfers and binding energies for the various nucleobases were calculated. The results revealed that the interactions between the nucleobases and the MoS2 can be strongly enhanced by introducing metal atom, due to significant charge transfer from the Li atom to the MoS2 when Lithium is placed on top of the MoS2. Furthermore, the binding energies of the five nucleobases were in the range of −0.734 to −0.816eV for MoS2 and −1.47 to −1.80eV for the Li-MoS2. Also, nucleobases were adsorbed onto MoS2 sheets via the van der Waals (vdW) force. This high affinity and the renewable properties of the biosensing platform demonstrated that Li-MoS2 nanosheet is biocompatible and suitable for nucleic acid analysis.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.162
      Issue No: Vol. 434 (2017)
       
  • Surface modification of chitin and chitosan with poly(3-hexylthiophene)
           via oxidative polymerization
    • Authors: Thien An Phung Hai; Ryuichi Sugimoto
      Pages: 188 - 197
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Thien An Phung Hai, Ryuichi Sugimoto
      In the present work, the modification of biomaterials such as chitin and chitosan were successfully prepared by directly grafting poly(3-hexylthiophene) (P3HT) to their surfaces using simple oxidative polymerization with FeCl3. The thermal stability and crystallinity of grafted chitin and chitosan changed upon grafting with P3HT. The build-up of π-π* structure from the P3HT on the surface of chitin and chitosan resulted in the appearance of UV–vis absorption and fluorescence emission peaks in the range from 500 to 600nm. Introducing P3HT to the surface of chitin and chitosan improved significantly the electrical property of chitin and chitosan with the increase in conductivity from 10−9 to 10−7 S/cm. Furthermore, the usual behavior of hydrophilic surface of chitin and chitosan that turned to hydrophobic with water contact angle of 97.7° and 107.0°, respectively in the presence of P3HT. The mechanism for graft reaction of P3HT to chitin and chitosan was also proposed and discussed.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.197
      Issue No: Vol. 434 (2017)
       
  • Surface processing and ageing behavior of silk fabrics treated with
           atmospheric-pressure plasma for pigment-based ink-jet printing
    • Authors: Chunming Zhang; Libing Wang; Miao Yu; Lijun Qu; Yajing Men; Xiangwu Zhang
      Pages: 198 - 203
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Chunming Zhang, Libing Wang, Miao Yu, Lijun Qu, Yajing Men, Xiangwu Zhang
      Pigment inkjet printing has highlighted the advantages of cost-effective, short production cycle and environment-friendly. However, patterns directly printed with pigment inks usually have low color yields and blurry images which are caused by bleeding phenomenon. This work presents an atmospheric-pressure plasma method for improving the pigment-based ink-jet printing performance of silk fabrics. The effects of surface changes induced are discussed, with data derived from morphological study by atomic force microscopy (AFM), chemical analysis using X-ray photoelectron spectroscopy (XPS) and contact angle measurement. Ink-jet printing experiments were conducted to study the influence of measured changes on anti-bleeding property and color strength of treated and original samples. The ageing experiment indicates that the modified silk fabrics should be printed within 24h after plasma processing for maximum color yields. This study explores an effective approach for the atmospheric-pressure plasma, which can provide its significant use in improving the surface properties and ink-jet printing performance of fabrics.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.178
      Issue No: Vol. 434 (2017)
       
  • A facile FeBr3 based photoATRP for surface modification of mesoporous
           silica nanoparticles for controlled delivery cisplatin
    • Authors: Long Huang; Meiying Liu; Liucheng Mao; Qiang Huang; Hongye Huang; Guangjian Zeng; Jianwen Tian; Yuanqing Wen; Xiaoyong Zhang; Yen Wei
      Pages: 204 - 210
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Long Huang, Meiying Liu, Liucheng Mao, Qiang Huang, Hongye Huang, Guangjian Zeng, Jianwen Tian, Yuanqing Wen, Xiaoyong Zhang, Yen Wei
      Mesoporous silica nanoparticles (MSNs) should be one of the most important materials for biomedical application owing to their high specific surface area, regular porous structure, adjustable pore size and chemical inert. However, the biomedical applications of unmodified MSNs are largely impeded for their poor hydrophilicity and lack of functional groups. In this work, a novel photo-initiated atom transfer radical polymerization (ATRP) strategy has been reported for modified mesoporous silica nanoparticles (MSNs) with hydrophilicility copolymers using FeBr3 as the novel photocatalyst and itaconic acid (IA) and 2-methacryloyloxyethyl phosphorylcholine (MPC) as monomers. Because of the hydrophilicity and anticancer agent cis-dichlorodiamineplatinum(II) (CDDP) loading capacity of poly(MPC-co-IA), the controlled drug delivery applications MSNs-NH2-poly(MPC-co-IA) composites toward CDDP were further investigated. A series of characterization results demonstrated that MSNs-NH2-poly(MPC-co-IA) composites can be successfully fabricated through the novel photo-initiated ATRP. MSNs-NH2-poly(MPC-co-IA) composites showed obvious enhancement of water dispersibility, desirable biocompatibility, high drug loading capability, making them great potential for controlled drug delivery of CDDP. Moreover, as compared with the traditional ATRP, that using the transition metal ions and organic ligands as the catalysis systems in elevated temperature, our method provides a more facile, benign and cost-effective route for fabrication of multifunctional MSNs with great potential for biomedical applications. Finally, this FeBr3 based photoATRP strategy should be further extended for the fabrication of many other polymeric composites owing to its good monomer adoptability.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.187
      Issue No: Vol. 434 (2017)
       
  • The role of the intrinsic Se and In vacancies in the interaction of O2 and
           H2O molecules with the InSe monolayer
    • Authors: Dongwei Ma; Tingxian Li; Di Yuan; Chaozheng He; Zhiwen Lu; Zhansheng Lu; Zongxian Yang; Yuanxu Wang
      Pages: 215 - 227
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Dongwei Ma, Tingxian Li, Di Yuan, Chaozheng He, Zhiwen Lu, Zhansheng Lu, Zongxian Yang, Yuanxu Wang
      Based on first-principle calculations, the effects of the intrinsic point defects, including single Se vacancy and single In vacancy, on the interaction of O2 and H2O molecules with the InSe monolayer are theoretically studied. Both vacancies can significantly enhance the chemical activity of InSe toward the adsorbates. However, H2O molecules highly tend to be physisorbed on the InSe monolayers under ambient conditions, irrespective of the presence of the vacancies. Both the pristine InSe and that with the In vacancy are p-doped by H2O, while the InSe with the Se vacancy is n-doped by H2O. O2 molecules with p-doping effects also highly tend to be physisorbed on the pristine InSe monolayer, while the presence of the vacancies significantly facilitates the O2 dissociation. The O2 dissociation process on the pristine InSe monolayer is endothermic by 1.24eV and needs to overcome an energy barrier of 2.85eV. However, In vacancies make the O2 dissociation process on the InSe monolayer exothermic by 2.15eV with an energy barrier of∼1.0eV. Significantly, O2 dissociation on the InSe monolayers with Se vacancies are highly exothermic by 4.57eV with an energy barrier of only 0.17eV. These results suggest that the defects with agglomerated vacancies, such as edges and grain boundaries, may play an important role in the oxidation and degradation of the 2D InSe under ambient conditions. Our theoretical results can help better understanding the doping and the oxidation of the 2D InSe semiconductor under ambient conditions.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.204
      Issue No: Vol. 434 (2017)
       
  • Synthesis and characterization of Ni-doped TiN thin films deposited by jet
           electrodeposition
    • Authors: F.F. Xia; W.C. Jia; C.Y. Ma; R. Yang; Y. Wang; M. Potts
      Pages: 228 - 233
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): F.F. Xia, W.C. Jia, C.Y. Ma, R. Yang, Y. Wang, M. Potts
      The Ni-doped TiN thin films were successfully prepared by jet electrodeposition in this paper. The microstructure, corrosion properties and mechanical deformation response of the films were studied by means of high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), electrochemical workstation and triboindenter (TI) equipment. The results indicated that the Ni-doped TiN thin film fabricated at the TiN addition amount of 5g/L, had an uniform and fine microstructure. The average particle sizes of nickel grains and TiN nanoparticles were 44.5 and 23.2nm, respectively. The Ni-doped TiN thin film obtained at 5g/L had the minimum corrosion potential and corrosion current values of −0.398V and 1.08×10−3mA/cm2, respectively. When the applied load was 1500μN, the depths of the Ni-doped TiN thin films produced at 3g/L, 5g/L and 8g/L were approximately 35, 28 and 30μm, respectively. The nanohardness of the Ni-doped TiN thin film deposited at 5g/L demonstrated the highest nanohardness (∼34.5GPa), whereas the film prepared at 3g/L had the lowest nanohardness (∼25.8GPa). Subsequently to 4 sliding scans, the amounts of plastic deformation and wear damage in the Ni-doped TiN thin film prefabricated at 5g/L were the lowest compared to the other films.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.203
      Issue No: Vol. 434 (2017)
       
  • Effects of ordered mesoporous structure and La-doping on the microwave
           absorbing properties of CoFe2O4
    • Authors: Tao Shang; Qingshan Lu; Luomeng Chao; Yanli Qin; Yuehou Yun; Guohong Yun
      Pages: 234 - 242
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Tao Shang, Qingshan Lu, Luomeng Chao, Yanli Qin, Yuehou Yun, Guohong Yun
      Low-density ordered mesoporous CoFe2O4 (OCFO) and CoLa0.12Fe1.88O4 (OCLFO) are prepared by nanocasting method using mesoporous silica SBA-15 as a hard-template. The crystal structure, surface chemical state, magnetic properties and electromagnetic parameters are characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurement, X-ray photoelectron spectroscopy, physical property measurement system and vector network analyzer. The results show that all the samples formed a single phase with cubic spinel structure. Meanwhile OCFO and OCLFO possess a highly ordered mesostructure. Comparing with particle CoFe2O4 (P-CFO), OCFO with high specific surface area exhibits lower magnetic saturation (M s), higher imaginary part of complex permittivity (ε′′) and imaginary part of the complex permeability (μ′′). The minimum reflection loss (R L) of OCFO reaches −27.36dB with a matching thickness of 3.0mm. The enhancement of the microwave absorbing performances of OCFO can be mainly attributed to the good impedance matching, high electromagnetic wave attenuation and multiple reflections of electromagnetic wave originated from the ordered mesoporous structure. The M s of OCLFO decreases after La3+ doping, while the specific surface area, coercivity value, ε′′ and μ′′ of OCLFO increase. The minimum R L of OCLFO reaches −46.47dB with a thickness of 3.0mm, and the effective absorption frequency bandwidth reaches 4.9GHz.
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      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.175
      Issue No: Vol. 434 (2017)
       
  • Reduced-graphene-oxide supported tantalum-based electrocatalysts:
           Controlled nitrogen doping and oxygen reduction reaction
    • Authors: Xiaoyun Yang; Qijie Mo; Yulin Guo; Nana Chen; Qingsheng Gao
      Pages: 243 - 250
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Xiaoyun Yang, Qijie Mo, Yulin Guo, Nana Chen, Qingsheng Gao
      Controlled N-doping is feasible to engineer the surface stoichiometry and the electronic configuration of metal-oxide electrocatalysts toward efficient oxygen reduction reactions (ORR). Taking reduced graphene oxide supported tantalum-oxides (TaOx/RGO) for example, this work illustrated the controlled N-doping in both metal-oxides and carbon supports, and the contribution to the improved ORR activity. The active N-doped TaOx/RGO electrocatalysts were fabricated via SiO2-assisted pyrolysis, in which the amount and kind of N-doping were tailored toward efficient electrocatalysis. The optimal nanocomposites showed a quite positive half-wave potential (0.80V vs. RHE), the excellent long-term stability, and the outstanding tolerance to methanol crossing. The improvement in ORR was reasonably attributed to the synergy between N-doped TaOx and N-doped RGO. Elucidating the importance of controlled N-doping for electrocatalysis, this work will open up new opportunities to explore noble-metal-free materials for renewable energy applications.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.185
      Issue No: Vol. 434 (2017)
       
  • Reduced graphene oxide modified NiFe-calcinated layered double hydroxides
           for enhanced photocatalytic removal of methylene blue
    • Authors: Guoqing Zhao; Caifeng Li; Xia Wu; Jingang Yu; Xinyu Jiang; Wenjihao Hu; Feipeng Jiao
      Pages: 251 - 259
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Guoqing Zhao, Caifeng Li, Xia Wu, Jingang Yu, Xinyu Jiang, Wenjihao Hu, Feipeng Jiao
      Calcined layered double hydroxides (CLDH) are one of the remarkable photocatalysts passionately studied for photodecolorization of organic dyes. NiFe-CLDH was successfully modified by reduced graphene oxide (RGO) through a facile in situ crystallization technique. The obtained RGO/NiFe-CLDH composites were fully characterized by powder X-ray diffraction (XRD), Scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared (FT-IR), and UV–vis diffuse reflectance spectroscopy (DRS). The results analysis indicated that RGO sheets could work as base course to prompt the growth of LDH crystallites and NiFe-LDH lamellar crystal promiscuously distributed on the sheets with a strong interplay between each other. The photocatalytic performance of RGO/NiFe-CLDH composites toward decolorization of methylene blue tightly depended on the mass fraction of RGO and calcinated temperature. At the RGO weight loading of 1%, calcination temperature of 500°C, the photocatalytic degradation efficiency of RGO/NiFe-CLDH composites reached 93.0% within 5.0h. The enhanced activity of RGO/NiFe-CLDH composites may be due to the concerted catalysis effect between two constituents of as-prepared composites.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.181
      Issue No: Vol. 434 (2017)
       
  • Self-catalytic stabilized Ag-Cu nanoparticles with tailored SERS response
           for plasmonic photocatalysis
    • Authors: Lili He; Changqing Liu; Jia Tang; Youchen Zhou; Hui Yang; Ruiyu Liu; Jiugang Hu
      Pages: 265 - 272
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Lili He, Changqing Liu, Jia Tang, Youchen Zhou, Hui Yang, Ruiyu Liu, Jiugang Hu
      In-situ SERS monitoring of direct plasmon-driven photocatalysis was achieved using relatively earth-abundant Cu NPs following their decoration with tiny amounts of silver, which promoted excellent SERS and high catalytic activity. The SERS and catalytic performance of the Ag-Cu NPs can be tuned by changing their composition. In particular, it was found that the surface oxidation state of copper could be switched to its metallic state via self-plasmon catalysis under laser irradiation, highlighting the potential of air-unstable copper NPs as stable plasmonic catalysts. These dual functional Ag-Cu NPs were used for SERS real-time monitoring of plasmon-driven photocatalysis reactions involving the degradation of Rhodamine 6G and the dimerization of 4-nitrothiophenol. The corresponding catalytic reaction mechanisms were discussed.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.155
      Issue No: Vol. 434 (2017)
       
  • Investigation of tribological properties of graphene oxide reinforced
           ultrahigh molecular weight polyethylene under artificial seawater
           lubricating condition
    • Authors: Wenchao Pang; Zifeng Ni; JiaLiang Wu; Yongwu Zhao
      Pages: 273 - 282
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Wenchao Pang, Zifeng Ni, JiaLiang Wu, Yongwu Zhao
      A range of ultrahigh molecular weight polyethylene (UHMWPE)/graphene oxide (GO) nanocomposites were fabricated using liquid-phase ultrasonication mixing followed by hot-pressing. The wettability, water absorption and corrosion resistance of composites were studied to prove the composites were suitable for application in liquid environment. The tribological properties of composites under dry, deionized water and seawater lubricating condition were investigated. The results showed that the incorporation of GO decreased the wear rate of UHMWPE under different lubricating conditions and with the increase of GO addition, the wear rate of UHMWPE/GO composites decreased. UHMWPE/GO composites exhibited better tribological behaviors under seawater lubricating condition than other conditions, because good corrosion resistance and excellent wear resistance of UHMWPE/GO composites, and the lubricating effect of seawater is also indispensable.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.115
      Issue No: Vol. 434 (2017)
       
  • Hybridizing polypyrrole chains with laminated and two-dimensional Ti3C2Tx
           toward high-performance electromagnetic wave absorption
    • Authors: Yuan Tong; Man He; Yuming Zhou; Xi Zhong; Lidan Fan; Tingyuan Huang; Qiang Liao; Yongjuan Wang
      Pages: 283 - 293
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Yuan Tong, Man He, Yuming Zhou, Xi Zhong, Lidan Fan, Tingyuan Huang, Qiang Liao, Yongjuan Wang
      In this study, multilayer sandwich heterostructural Ti3C2Tx MXenes decorated with polypyrrole chains have been synthesized successfully via HF etching treatment and in-situ chemical oxidative polymerization approach. The hybrids were investigated as EM wave absorbers for the first time. It is found that the composites consisting of 25wt% Ti3C2Tx/PPy hybrids in a paraffin matrix exhibit a minimum reflection loss of −49.2dB (∼99.99% absorption) at the thickness of 3.2mm and a maximum effective absorption bandwidth of 4.9GHz (12.4–17.3GHz) corresponding to an absorber thickness of 2.0mm. Additionally, a broad effective absorption bandwidth of 13.7GHz (4.3–18.0GHz) can be reached up by adjusting the thickness from 1.5 to 5.0mm. Furthermore, the highest effective absorption bandwidth of 5.7GHz can be reached when the mass fraction is 15wt%. The enhanced comprehensive electromagnetic wave absorption has close correlation with the well-designed heterogeneous multilayered microstructure, generated heterogeneous interfaces, conductive paths, surface functional groups, localized defects and synergistic effect between laminated Ti3C2Tx and conductive polypyrrole network, which significantly improve impedance matching and attenuation abilities. The superior absorbing performance together with strong absorption and broad bandwidth endows the Ti3C2Tx/PPy hybrids with the potential prospect to be advanced EM wave absorbers.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.140
      Issue No: Vol. 434 (2017)
       
  • NO-sensing performance of vacancy defective monolayer MoS2 predicted by
           density function theory
    • Authors: Feifei Li; Changmin Shi
      Pages: 294 - 306
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Feifei Li, Changmin Shi
      Using density functional theory (DFT), we predict the NO-sensing performance of monolayer MoS2 (MoS2-MLs) with and without MoS3-vacancy/S-vacancy defects. Our theoretical results demonstrate that MoS3- and S-vacancy defective MoS2-MLs show stronger chemisorption and greater electron transfer effects than pure MoS2-MLs. The charge transfer analysis showed pure and defective MoS2-MLs all act as donors. Both MoS3-vacancy and S-vacancy defects induce dramatic changes of electronic properties of MoS2-MLs, which have direct relationship with gas sensing performance. In addition, S-vacancy defect leads to more electrons transfer to NO molecule than MoS3-vacancy defect. The H2O molecule urges more electrons transfer from MoS3- or S-vacancy defective MoS2-MLs to NO molecule. We believe that this calculation results will provide some information for future experiment.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.167
      Issue No: Vol. 434 (2017)
       
  • Electrodeposition of nickel-iridium alloy films from aqueous solutions
    • Authors: Wangping Wu; Jinjin Jiang; Peng Jiang; Zhizhi Wang; Ningyi Yuan; Jianning Ding
      Pages: 307 - 317
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Wangping Wu, Jinjin Jiang, Peng Jiang, Zhizhi Wang, Ningyi Yuan, Jianning Ding
      Nickel–iridium (Ni-Ir) alloy films were electrodeposited from aqueous solutions on copper substrates under galvanostatic conditions. The effects of bath composition and deposition time on the faradaic efficiency (FE), partial current densities, chemical composition, morphology and crystallographic structure of the films were studied. The results show that the Ni–Ir alloys with Ir content as high as 37 at% and FE as high as 44% were obtained. Increase in concentration of citric acid had little or no effect on the composition of the alloys, but resulted in a significant decrease in FE and partial current densities of Ni and Ir. The FE and the partial current density of Ni slightly decreased with increasing Ir3+ concentration, however, Ir content increased while partial current density of Ir remained stable. The increase of Ni2+ concentration could result in the increase of the FE and the rate of Ni–Ir deposition, and even no cracks formed on the surface. The surface average roughness and root mean square roughness of the film were 6.8±0.3nm and 5.4±0.3nm, respectively. The mixture phases contained significant amounts of Ni oxides and a small amount of metallic Ni, Ir and Ir oxides on the surface. After argon ion sputter cleaning, the film was mainly composed of metallic Ni and Ir. The film consisted of the amorphous and nanocrystalline phases. The Ni content in the deposits was higher than that in the electrolyte, the co-deposition of Ni–Ir alloy was a normal deposition.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.180
      Issue No: Vol. 434 (2017)
       
  • Electromagnetic interference shielding effectiveness of microcellular
           polyimide/in situ thermally reduced graphene oxide/carbon nanotubes
           nanocomposites
    • Authors: Hongli Yang; Zhi Yu; Peng Wu; Huawei Zou; Pengbo Liu
      Pages: 318 - 325
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Hongli Yang, Zhi Yu, Peng Wu, Huawei Zou, Pengbo Liu
      A simple and effective method was adopted to fabricate microcellular polyimide (PI)/reduced graphene oxide (GO)/multi-walled carbon nanotubes (MWCNTs) nanocomposites. Firstly, microcellular poly (amic acid) (PAA)/GO/MWCNTs nanocomposites were prepared through solvent evaporation induced phase separation. In this process, PAA and dibutyl phthalate (DBP) co-dissolved in N,N-dimethylacetamide (DMAc) underwent phase separation with DMAc evaporating, and DBP microdomains were formed in continuous PAA phase. Subsequently, PAA was thermally imidized and simultaneously GO was in situ reduced. After DBP was removed, the microcellular PI/reduced GO (RGO)/MWCNTs nanocomposites were finally obtained. When the initial filler loading was 8wt%, the electrical conductivity of microcellular PI/RGO, PI/MWCNTs and PI/RGO/MWCNTs nanocomposites were 0.05, 0.02 and 1.87S·m−1, respectively, and the electromagnetic interference (EMI) shielding efficiency (SE) of microcellular PI/RGO, PI/MWCNTs and PI/RGO/MWCNTs nanocomposites were 13.7–15.1, 13.0–14.3 and 16.6–18.2dB, respectively. The synergistic effect between RGO and MWCNTs enhanced both the electrical conductivity and EMI shielding performance of the microcellular PI/RGO/MWCNTs nanocomposites. The dominating EMI shielding mechanism for these materials was microwave absorption. While the initial loading of GO and MWCNT was 8wt%, the microcellular PI/RGO/MWCNTs nanocomposite (500μm thickness) had extremely high specific EMI SE value of 755–823dB·cm2·g−1. Its thermal stability was also obviously improved, the 5% weight loss temperature in nitrogen was 548°C. In addition, it also possessed a high Young’s modulus of 789MPa.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.191
      Issue No: Vol. 434 (2017)
       
  • Evolution processes of the corrosion behavior and structural
           characteristics of plasma electrolytic oxidation coatings on AZ31
           magnesium alloy
    • Authors: Dong Chen; Ruiqiang Wang; Zhiquan Huang; Yekang Wu; Yi Zhang; Guorui Wu; Dalong Li; Changhong Guo; Guirong Jiang; Shengxue Yu; Dejiu Shen; Philip Nash
      Pages: 326 - 335
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Dong Chen, Ruiqiang Wang, Zhiquan Huang, Yekang Wu, Yi Zhang, Guorui Wu, Dalong Li, Changhong Guo, Guirong Jiang, Shengxue Yu, Dejiu Shen, Philip Nash
      Evolution processes of the corrosion behavior and structural characteristics of the plasma electrolytic oxidation (PEO) coated AZ31 magnesium alloy were investigated by using scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), potentio-dynamic polarization curves and electrochemical impedance spectroscopy (EIS) measurements. Detached coating samples were fabricated by an electrochemical method and more details of the internal micro-structure of coatings were clearly observed on the fractured cross-section morphologies of the samples compared to general polished cross-section morphologies. Evolution mechanisms of the coating corrosion behavior in relation to the evolution of micro-structural characteristics were discussed in detail.

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.09.232
      Issue No: Vol. 434 (2017)
       
  • Synthesis and characterization of titanate nanotube/single-walled carbon
           nanotube (TNT/SWCNT) porous nanocomposite and its photocatalytic activity
           on 4-chlorophenol degradation under UV and solar irradiation
    • Authors: A. Payan; M. Fattahi; S. Jorfi; B. Roozbehani; S. Payan
      Pages: 336 - 350
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): A. Payan, M. Fattahi, S. Jorfi, B. Roozbehani, S. Payan
      The titanate nanotube/single-wall carbon nanotube (TNT/SWCNT) nanocomposites from different titania precursors were prepared by a two-step hydrothermal process. These nanocomposites were characterized by XRD, BET, Raman, FESEM, TEM, EDX, EDS, EIS, UV–vis DRS and FTIR techniques. The FESEM and TEM images showed the high porous nanocomposites with two types of tubular structure relating to TNTs and SWCNTs which were interwoven together uniformly. The XRD and Raman analysis further corroborated the chemical interaction between the SWCNT and the TNT in the nanocomposites. The photocatalytic performance of the as-synthesized composites were examined by the photodegradation of 4-CP under solar and UV illumination. The results revealed an impressive enhancement in photocatalytic activity of the nanocomposites under both irradiation conditions comparison to bare TNPs and TNTs. Amongst the TNT/SWCNT nanocomposites, 10% loading of SWCNT under UV irradiation and 5% loading of SWCNT under solar irradiation exhibited the maximum photocatalytic performance while the photocatalytic degradation efficiency of nanocomposites were not affected considerably by the type of precursor. Moreover, the mechanism and role of SWCNT were investigated and the plausible degradation pathways of 4-CP was suggested. TOC analyses was performed for determination of 4-CP mineralization rate and results showed complete mineralization after 240 and 390min under UV and solar irradiation, respectively. The trapping experiments corroborated the O2 − and OH radicals as the main reactive species in 4-CP degradation process. Langmuir-Hinshelwood kinetic model was fittingly matched with the experimental data (R2: 0.9218 and 0.9703 for UV and solar irradiation). Additionally, the stability of the nanocomposites were investigated and revealed 8% decrease in degradation efficiency after four cycles.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.149
      Issue No: Vol. 434 (2017)
       
  • Lanthanum and cerium co-modified Ni/SiO2 catalyst for CO methanation from
           syngas
    • Authors: Dandan Gong; Shuangshuang Li; Shaoxia Guo; Honggui Tang; Hong Wang; Yuan Liu
      Pages: 351 - 364
      Abstract: Publication date: 15 March 2018
      Source:Applied Surface Science, Volume 434
      Author(s): Dandan Gong, Shuangshuang Li, Shaoxia Guo, Honggui Tang, Hong Wang, Yuan Liu
      Sintering of active metal nanoparticles (NPs) and carbon deposition is critical problems for many metal catalysts, such as nickel based catalysts for generating methane from syngas. To improve the resistance to the sintering and carbon deposition, a new scheme was proposed in this work. Lanthanum and cerium co-modified Ni/SiO2 catalysts were synthesized by using perovskite type oxide of La1-xCexNiO3 loaded on SiO2 as the precursor. In a nanocrystallite of La1-xCexNiO3, ions of nickel, lanthanum and cerium are evenly mixed at atomic level and confined in the nanocrystallite, therefore, Ni NPs and the two promoters of La2O3 and CeO2 should be in close contact and highly dispersed on SiO2 after reduction. The catalysts were characterized by using XRD, TEM, BET, H2-TPD, XPS, TG and Raman techniques. Compared with the mono-promoted catalysts, the bi-promoted La0.75Ce0.25NiO3/SiO2 showed much better resistance to carbon deposition, higher resistance to sintering and higher activity for CO methanation, which are attributed to co-eliminating effect of the two promoters for the deposited carbon, confinement of the interacted two promoters for Ni NPs and the higher dispersion of Ni NPs derived from the smaller size of La0.75Ce0.25NiO3.
      Graphical abstract image

      PubDate: 2017-11-09T02:17:17Z
      DOI: 10.1016/j.apsusc.2017.10.179
      Issue No: Vol. 434 (2017)
       
  • Splitting of the ultraviolet plasmon resonance from controlling FePt
           nanoparticles morphology
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Jian Yu, Tingting Xiao, Xuemin Wang, Yan Zhao, Xiaojia Li, Xibin Xu, Zhengwei Xiong, Xinming Wang, Liping Peng, Jin Wang, Hongbu Yin, Jie Chen, Gang Meng, Yifan Li, Weidong Wu
      We show a designed FePt nanoparticles for embedding in a single crystal MgO matrix and demonstrate plasmon resonance absorption can appear in the ultraviolet region. The state of the FePt alloy is confirmed by X-ray photoelectron spectroscopy and selected area electron diffraction. By increasing the laser energy density from 4 to 6 J/cm2, the shape of the FePt nanoparticles is changed from quasi-spherical to quasi-elliptical. Compared with pure MgO, a single plasmon resonance peak at 234 nm was found in the ultraviolet region for the embedded FePt. Increasing the laser energy density induces peak splitting into two peaks, located at 225 and 262 nm, respectively. With a high laser energy density, a red-shift and a blue-shift are observed for the two peaks, respectively. These results are accordance with the theoretical calculations. The ultraviolet plasmon resonance absorption for FePt NPs can be tuned by changing the shape of the nanoparticles.

      PubDate: 2017-11-16T13:13:39Z
       
  • Electromagnetic shielding effectiveness of a thin silver layer deposited
           onto PET film via atmospheric pressure plasma reduction
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Hyo-Jun Oh, Van-Duong Dao, Ho-Suk Choi
      This study presents the first use of a plasma reduction reaction under atmospheric pressure to fabricate a thin silver layer on polyethylene terephthalate (PET) film without the use of toxic chemicals, high voltages, or an expensive vacuum apparatus. The developed film is applied to electromagnetic interference (EMI) shielding. After repeatedly depositing a silver layer through a plasma reduction reaction on PET, we can successfully fabricate a uniformly deposited thin silver layer. It was found that both the particle size and film thickness of thin silver layers fabricated at different AgNO3 concentrations increase with an increase in the concentration of AgNO3. However, the roughness of the thin silver layer decreases when increasing the concentration of AgNO3 from 100 to 500 mM, and the roughness increases with a further increase in the concentration of AgNO3. The EMI shielding effectiveness (SE) of the film is measured in the frequency range of 0.045 to 1 GHz. As a result of optimizing the electrical conductivity by measuring sheet resistance of the thin silver layer, the film fabricated from 500 mM AgNO3 exhibits the highest EMI SE among all fabricated films. The maximum values of the EMI SE are 60.490 dB at 0.1 GHz and 54.721 dB at 1.0 GHz with minimum sheet resistance of 0.244 Ω/□. Given that the proposed strategy is simple and effective, it is promising for fabricating various low-cost metal films with high EMI SE.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Self-assembled metal nano-multilayered film prepared by co-sputtering
           method
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Tianle Xie, Licai Fu, Wen Qin, Jiajun Zhu, Wulin Yang, Deyi Li, Lingping Zhou
      Nano-multilayered film is usually prepared by the arrangement deposition of different materials. In this paper, a self-assembled nano-multilayered film was deposited by simultaneous sputtering of Cu and W. The Cu/W nano-multilayered film was accumulated by W-rich layer and Cu-rich layer. Smooth interfaces with consecutive composition variation and semi-coherent even coherent relationship were identified, indicating that a spinodal-like structure with a modulation wavelength of about 20 nm formed during co-deposition process. The participation of diffusion barrier element, such as W, is believed the essential to obtain the nano-multilayered structure besides the technological parameters.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Electrocatalytic behavior of a nanocomposite of Ni/Pd supported by
           carbonized PVA nanofibers towards formic acid, ethanol and urea oxidation:
           A physicochemical and electro-analysis study
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Ibrahim M.A. Mohamed, Ahmed S. Yasin, Nasser A.M. Barakat, Seung A. Song, Ha Eun Lee, Seong Su Kim
      A nanocomposite of Ni/Pd supported by carbonized poly-vinyl alcohol (PVA) nanofibers (NFs) was synthesized via electrospinning followed by calcination under an argon atmosphere. The as-synthesized NFs were studied using physicochemical analyses, such as field-emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), to investigate the morphology, crystallinity, effect of carbonization and surface chemistry of the NFs, respectively. Cyclic voltammetry (CV) and chronoamperometry (CA) were utilized to study the performance of the NFs towards electrooxidation reactions. The designed NFs present superior electrocatalytic behavior in an acid medium towards formic acid oxidation, as well as urea and ethanol oxidation in an alkaline medium. The electrocatalytic performance of the bimetallic NFs appears to arise from the assembly of bimetallic Ni/Pd@NFs based on PVA, which has hydroxyl groups. These hydroxyl groups can decrease the negative processes that occur as a result of metal-metal interactions, such as the aggregation process. This study introduces a novel non-precious electrocatalyst to facilitate the commercialization of fuel cells based on formic acid, urea and ethanol.
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      PubDate: 2017-11-16T13:13:39Z
       
  • Investigation of the heating behavior of carbide-bonded graphene coated
           silicon wafer used for hot embossing
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Gao Yang, Lihua Li, Wing Bun Lee, Man Cheung Ng, Chang Yuen Chan
      A recently developed carbide-bonded graphene (CBG) coated silicon wafer was found to be an effective micro-patterned mold material for implementing rapid heating in hot embossing processes owing to its superior electrical and thermal conductivity, in addition to excellent mechanical properties. To facilitate the achievement of precision temperature control in the hot embossing, the heating behavior of a CBG coated silicon wafer sample was experimentally investigated. First, two groups of controlled experiments were conducted for quantitatively evaluating the influence of the main factors such as the vacuum pressure and gaseous environment (vacuum versus nitrogen) on its heating performance. The electrical and thermal responses of this sample under a voltage of 60 V were then intensively analyzed, and revealed that it had somewhat semi-conducting properties. Further, we compared its thermal profiles under different settings of the input voltage and current limiting threshold. Moreover, the strong temperature dependence of electrical resistance for this material was observed and determined. Ultimately, the surface temperature of CBG coated silicon wafer could be as high as 1300 ℃, but surprisingly the graphene coating did not detach from the substrate under such an elevated temperature due to its strong thermal coupling with the silicon wafer.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Fe(II)-substituted cobalt ferrite nanoparticles against multidrug
           resistant microorganisms
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Rokas Žalnėravičius, Algimantas Paškevičius, Kęstutis Mažeika, Arūnas Jagminas
      The present study is focused on the determination the influence of cobalt content in the magnetic cobalt ferrite nanoparticles (Nps) on their antibacterial efficiency against gram-negative Escherichia coli and gram-positive Staphylococcus aureus bacteria and several Candida species, in particular C. parapsilosis and C. albicans. For the synthesis of Fe(II) substituted cobalt ferrite Nps by co-precipitation way, the L-lysine was used as the capping biocompatible agent and the particle size was successfully controlled to be in the range of 5–6.4 nm. The antimicrobial efficiencies of the CoxFe1-xFe2O4@Lys Nps, where x varies from 0.2 to 1.0, were evaluated through the quantitative analysis by comparing with that of Fe3O4@Lys Nps and l-lysine. In this way, it was evidenced that increase in the Co2+ content in the similar sized cobalt ferrite Nps resulted in an increase in their antimicrobial potency into 93.1–86.3 % for eukaryotic and into 96.4–42.7 % for prokaryotic strains. For characterization the composition, structure, and morphology of the tested herein Nps inductively coupled plasma optical emission spectrometry, X-ray diffraction, high-resolution transmission electron microscopy, Mössbauer, and FTIR spectroscopy techniques were conferred.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Facile synthesis of Ag@ZIF-8 core-shell heterostructure nanowires for
           improved antibacterial activities
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Yu-Feng Guo, Wei-Jun Fang, Jie-Ru Fu, Yun Wu, Jun Zheng, Gui-Qi Gao, Cheng Chen, Rui-Wen Yan, Shou-Guo Huang, Chun-Chang Wang
      Compared with pure MOFs, core-shell heterostructures of noble-metal@MOFs have attracted tremendous interest due to their unique structure and extensive applications. In the present study, we have successfully synthesized well-defined core-shell Ag@ZIF-8 nanowires. The products growth process has been investigated by examining the products obtained at different intervals and the thickness of ZIF-8 shell ranging from 30 to 100nm can be technically obtained by tuning the quantity of Ag nanowires. Ag@ZIF-8 has been proven to possess large specific surfaces and high thermal stability. Additionally, the antibacterial activity of Ag@ZIF-8 is further tested against Bacillus subtilis and Escherichia coli BL21. The results reveal that Ag@ZIF-8 core-shell heterostructure nanowires have effective activities against the two types of bacterial strains.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Vertically aligned TiO2 nanorods-woven carbon fiber for reinforcement of
           both mechanical and anti-wear properties in resin composite
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Jie Fei, Chao Zhang, Dan Luo, Yali Cui, Hejun Li, Zhaoqing Lu, Jianfeng Huang
      A series of TiO2 nanorods were successfully grown on woven carbon fiber by hydrothermal method to reinforce the resin composite. The TiO2 nanorods improved the mechanical interlocking among woven carbon fibers and resin matrix, resulting in better fibers/resin interfacial bonding. Compared with desized-woven carbon fiber, the uniform TiO2 nanorods array resulted in an improvement of 84.3% and 73.9% in the tensile and flexural strength of the composite. However, the disorderly TiO2 nanorods on woven carbon fiber leaded to an insignificant promotion of the mechanical strength. The enhanced performance of well-proportioned TiO2 nanorods-woven carbon fiber was also reflected in the nearly 56% decrease of wear rate, comparing to traditional woven carbon fiber reinforced composite.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Growth of high-quality AlN epitaxial film by optimizing the Si substrate
           surface
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Liegen Huang, Yuan Li, Wenliang Wang, Xiaochan Li, Yulin zheng, Haiyan Wang, Zichen Zhang, Guoqiang Li
      High-quality AlN epitaxial films have been grown on Si substrates by optimizing the hydrofluoric acid (HF) solution for cleaning of Si substrates. Effect of the Si substrate surface on the surface morphology and structural property of AlN epitaxial films is investigated in detail. It is revealed that as the concentration of HF solution increases from 0 to 2.0%, the surface morphology and the crystalline quality are initially improved and then get worse, and show an optimized value at 1.5%. The as-grown ∼200nm-thick AlN epitaxial films on Si substrates grown with HF solution of 1.5% reveal the root-mean-square (RMS) surface roughness of 0.49nm and the full-width at half-maximum for AlN(0002) X-ray rocking curve of 0.35°, indicating the smooth surface morphology and the high crystalline quality. The corresponding mechanism is proposed to interpret the effect of Si substrate surface on surface morphology and structural property of AlN epitaxial films, and provides an effective approach for the perspective fabrication of AlN-based devices.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Magnetic, core-shell structured and surface molecularly imprinted polymers
           for the rapid and selective recognition of salicylic acid from aqueous
           solutions
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Zulei Zhang, Dechao Niu, Yongsheng Li, Jianlin Shi
      In this work, a novel kind of magnetic, core-shell structured and surface molecularly imprinted polymers (MMIPs) for the recognition of salicylic acid (SA) was facilely synthesized through a surface imprinting and sol-gel polymerization approach. The as-synthesized MMIPs exhibit uniform core-shell structure and favorable magnetic properties with a saturation magnetization of 22.8 emu g−1. The binding experiments demonstrated that MMIPs possessed high binding and specific recognition capacity, as well as fast binding kinetics and phase separation rate. The maximum binding capacity of MMIPs is around 36.8 mg g−1, nearly 6 times that of the magnetic non-imprinted polymers (MNIPs). Moreover, the selectivity experiments show that all the relative selectivity coefficients towards SA over its structure analogs are higher than 18, further indicating the markedly enhanced binding selectivity of MMIPs. Furthermore, the MMIPs were successfully applied for the determination of SA in environmental water samples with the recovery rates ranging from 94.0 to 108.0 %. This strategy may provide a versatile approach for the fabrication of well-defined molecularly imprinted polymers on nanomaterials for the analysis of complicated matrixes.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Preparation of epoxy-acrylate copolymer/nano-silica via Pickering emulsion
           polymerization and its application as printing binder
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Dangge Gao, Rui Chang, Bin Lyu, Jianzhong Ma, Xiying Duan
      This paper presents a facile and efficient synthesis method to fabricate epoxy-acrylate copolymer/nano-silica latex via Pickering emulsion polymerization stabilized by silica sol. The effects of solid contents, silica concentration and polymerization time on emulsion polymerization were studied. The core-shell epoxy-acrylate copolymer/nano-silica was obtained with average diameter 690 nm, was observed by Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS). The formation mechanism of epoxy-acrylate copolymer/nano-silica emulsion polymerization was proposed through observing the morphology of latex particles at different polymerization time. Fourier Transformation Infrared (FT-IR) and Thermogravimetric Analysis (TGA) were used to study structure and thermostability of the composites. Morphology of the latex film was characterized by Scanning Electron Microscope (SEM). The results indicated that nano-silica particles existed in the composite emulsion and could improve the thermal stability of the film. The epoxy-acrylate copolymer/nano-silica latex was used as binder applied to cotton fabric for pigment printing. The application results demonstrated that Pickering emulsion stabilized by silica sol has good effects in the pigment printing binder without surfactant. Compared with commodity binder, the resistance to wet rubbing fastness and soaping fastness were improved half grade.
      Graphical abstract image

      PubDate: 2017-11-16T13:13:39Z
       
  • Controllable synthesis of hierarchical nickel cobalt sulfide with enhanced
           electrochemical activity
    • Abstract: Publication date: 30 March 2018
      Source:Applied Surface Science, Volume 435
      Author(s): Jinjin Tie, Jiaxi Han, Guiqiang Diao, Jiwen Liu, Zhuopeng Xie, Gao Cheng, Ming Sun, Lin Yu
      The composition of nickel cobalt sulfide has great influence on its electrochemical performance. Herein, the nickel cobalt sulfide with different composition and mixed phase were synthesized by one-step solvothermal method through changing the molar ratio of Ni to Co in the reaction system. The electrochemical measurements showed that the nickel cobalt sulfide with a theoretical molar ratio of Ni/Co to be 1.5:1.5 (NCS-2) demonstrates the superior pseudocapacitive performance with a high specific capacitance (6.47Fcm−2 at 10mAcm−2) and a favorable Coulombic efficiency (∼99%). Whereas, when applied as the catalyst for hydrogen evolution reaction in 1M KOH aqueous electrolyte, the nickel cobalt sulfide with a theoretical molar ratio of Ni/Co is 1:2 (NCS-1) displays better catalytic activity, and it requires a relatively lower overpotential of 282mV to deliver the current density of 10mAcm−2.

      PubDate: 2017-11-16T13:13:39Z
       
 
 
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