Subjects -> CHEMISTRY (Total: 1021 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (746 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (49 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (746 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal  
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 36)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 14)
ACS Catalysis     Hybrid Journal   (Followers: 76)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 25)
ACS Combinatorial Science     Hybrid Journal   (Followers: 25)
ACS Macro Letters     Hybrid Journal   (Followers: 34)
ACS Materials Letters     Open Access   (Followers: 3)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 49)
ACS Nano     Hybrid Journal   (Followers: 448)
ACS Photonics     Hybrid Journal   (Followers: 19)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 40)
Acta Chemica Iasi     Open Access   (Followers: 8)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 81)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 15)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 14)
Advanced Science Focus     Free   (Followers: 7)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 108)
Advances in Chemical Science     Open Access   (Followers: 50)
Advances in Chemistry     Open Access   (Followers: 39)
Advances in Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 21)
Advances in Drug Research     Full-text available via subscription   (Followers: 27)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 13)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 20)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 11)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 35)
Advances in Nanoparticles     Open Access   (Followers: 20)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 20)
Advances in Polymer Science     Hybrid Journal   (Followers: 53)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 19)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 22)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 7)
Advances in Science and Technology     Full-text available via subscription   (Followers: 17)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Aggregate     Open Access   (Followers: 3)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 3)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 5)
Alchemy : Jurnal Penelitian Kimia     Open Access   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 71)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 24)
American Journal of Chemistry     Open Access   (Followers: 41)
American Journal of Plant Physiology     Open Access   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 40)
Analytical Science Advances     Open Access   (Followers: 2)
Angewandte Chemie     Hybrid Journal   (Followers: 235)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 353)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 8)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 6)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 13)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 16)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 2)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 12)
Applied Spectroscopy     Full-text available via subscription   (Followers: 27)
Applied Surface Science     Hybrid Journal   (Followers: 33)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 3)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access   (Followers: 2)
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 3)
Atomization and Sprays     Full-text available via subscription   (Followers: 8)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 484)
Biochemistry Insights     Open Access   (Followers: 7)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 11)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 3)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 4)
Biomacromolecules     Hybrid Journal   (Followers: 27)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 4)
BioNanoScience     Partially Free   (Followers: 6)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 213)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 88)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 4)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 26)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 13)
Canadian Mineralogist     Full-text available via subscription   (Followers: 7)
Carbohydrate Polymer Technologies and Applications     Open Access   (Followers: 3)
Carbohydrate Polymers     Hybrid Journal   (Followers: 13)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 76)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 13)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 14)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 17)
Cereal Chemistry     Full-text available via subscription   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 11)
Chemical and Engineering News     Free   (Followers: 25)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 88)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 28)
Chemical Physics Letters : X     Open Access   (Followers: 4)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 25)
Chemical Reviews     Hybrid Journal   (Followers: 265)
Chemical Science     Open Access   (Followers: 44)
Chemical Science International Journal     Open Access   (Followers: 1)
Chemical Technology     Open Access   (Followers: 71)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 23)
ChemInform     Hybrid Journal   (Followers: 9)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 31)
Chemistry & Industry     Full-text available via subscription   (Followers: 8)
Chemistry - A European Journal     Hybrid Journal   (Followers: 224)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 24)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry Education Research and Practice     Free   (Followers: 8)
Chemistry Education Review     Open Access   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry Letters     Full-text available via subscription   (Followers: 49)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 336)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Full-text available via subscription   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 14)
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access   (Followers: 1)
ChemSystemsChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 13)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 5)
Ciencia     Open Access   (Followers: 1)
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 12)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 24)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Chemical Research in Chinese Universities
Journal Prestige (SJR): 0.261
Citation Impact (citeScore): 1
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1005-9040 - ISSN (Online) 2210-3171
Published by Springer-Verlag Homepage  [2658 journals]
  • Improving Catalytic Stability and Coke Resistance of Ni/Al2O3 Catalysts
           with Ce Promoter for Relatively Low Temperature Dry Reforming of Methane
           Reaction

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      Abstract: A series of Ni catalysts supported on alumina with different Ce contents(1.0%–6.0%, mass fraction) was prepared by the impregnation method and used for dry reforming of methane(DRM) at a relatively low temperature of 650 °C. The promotion effect of Ce with different loading amounts on the physicochemical properties of the catalysts was systematically characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), N2 adsorption-desorption, thermo elemental IRIS Intrepid inductively coupled plasma atomic emission spectrometer (ICP-AES), UV-visible diffuse reflectance spectroscopy(UV-Vis DRS), Fourier transformation infrared(FTIR) spectra, H2-temperature programmed reduction(H2-TPR) analysis, H2-temperature programmed desorption(H2-TPD), and The X-ray photoelectron spectroscopy(XPS) techniques. The results indicate that all the catalysts mainly exist in the NiAl2O4 phase after being calcined at 750 °C with small Ni particle sizes due to the strong metal-support interaction derived from the reduction of the NiAl2O4 phase. The Ce-promoted catalysts show better catalytic performance as well as the resistance against sintering of Ni particles and deposition of carbon compared to the Ni/Al2O3 catalyst. The Ni-6Ce/Al2O3 exhibits the best catalytic stability and coke resistance among the four catalysts studied, which is due to its small Ni nanoparticles sizes, excellent reducibility as well as high amount of active oxygen species. In a 400 h stability test for DRM reaction at 650 °C, Ni-6Ce/Al2O3 exhibits less coke deposition and small growth of Ni nanoparticles. This work provides a simple way to preparing the Ni-Ce/Al2O3 catalyst with enhanced catalytic performance in DRM. The Ni-6Ce/Al2O3 catalyst has great potential for industrial application due to its anti-sintering ability and resistance to carbon deposition.
      PubDate: 2021-10-12
       
  • Architecting Pyrenyl-graphdiyne Nanowalls for High Capacity and Long-life
           Lithium Storage

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      Abstract: Graphdiyne, as the novel carbon allotrope, which is composed of sp2- and sp-hybridized carbon, has exhibited excellent catalytic activity and conductivity. It has been applied in series of fields, such as Li-battery, catalyst and energy conversion. Expanding well-defined structures and useful applications of graphdiyne is still full of challenges in material chemistry. Herein, we optimized the synthesis condition of pyrenylgraphdiyne to obtain the nanowall structure. Compared with the typical nanosheet structure, the pyrenyl-graphdiyne nanowalls (Pyr-GDY-NWs) have more area for lithium insertion. Lithium-ion battery featuring Pyr-GDY-NWs-based electrode exhibits a high reversible specific capacity up to 1464 mA·h/g, which is triple than that of the commercial graphite. We also used the theoretical calculation to investigate the mechanism of Li storage in Pyr-GDY-NWs. The experiment and theoretical data showed that Pyr-GDY-NWs had the potential application in lithium batteries. Therefore, Pyr-GDY with a defined structure would be applied in energy storage and energy conversion.
      PubDate: 2021-10-09
       
  • Diffusion Kinetics Study of Lithium Ion in the Graphdiyne Based Electrode

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      Abstract: Herein, we report a comparative investigation of the electrochemical lithium diffusion within graphidyne(GDY) based electrodes. The transfer kinetic behaviors of lithium ions during the insertion/extraction process are analyzed through different methods including the galvanostatic intermittent titration technique(GITT) and the electrochemical impedance spectroscopy (EIS). GDY with the morphology of nanosheets(GDY NS) shows lithium diffusion coefficients in the orders range of 10−12–10−13 cm2/s through the GITT method. Meanwhile, EIS indicates quite a lower value of lithium diffusion coefficients between 10−13 and 10−15 cm2/s, which indicates that the analysis technique has an influence on the evaluation of GDY-based electrodes. In addition, under the same measurement condition of GITT, GDY nanoparticles(GDY NP) exhibit a lower value of Li+ diffusion coefficient(10−14–10−16 cm2/s) during the charge-discharge process compared to those of GDY NS, which can be ascribed to the wide distributing range of particle size in GDY NP based electrodes. The analysis results in this work reveal that the aggregating forms of GDY electrode material have an important effect on the diffusion process of lithium ions, which provides a pathway to optimize the performance of GDY-based energy storage devices.
      PubDate: 2021-10-08
       
  • Graphdiyne Oxide Modified NiOx for Enhanced Charge Extraction in Inverted
           Planar MAPbI3 Perovskite Solar Cells

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      Abstract: The interface defects and nickel vacancies of the NiOx lead to interface charge recombination, which limits its application in perovskite solar cells. Here, graphdiyne oxide(GDYO) was added to NiOx as an inorganic hole transporting material. It is found that the average carrier lifetime declined from 29.2 ns to 5.4 ns and the recombination resistance increased significantly after the GDYO adding determined by the time-resolved photoluminescence and electrochemical impedance spectroscopy analysis. We further demonstrated that the GDYO adding to NiOx effectively improved the charge extraction, accelerated the charge transportation and suppressed the charge recombination. Consequently, the optimized NiOx(GDYO)-based cell showed superior performance with a higher fill factor(81.99%) and improved stability with respect to the reference device. This method provides a new method for property regulation of NiOx in inverted planar MAPbI3 perovskite solar cells.
      PubDate: 2021-10-08
       
  • Crystallographic Understanding of Photoelectric Properties for C60
           Derivatives Applicable as Electron Transporting Materials in Perovskite
           Solar Cells

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      Abstract: Hundreds of C60 derivatives stand out as electrontransporting materials(ETMs), for example, in perovskite solar cells(PSCs), due to their properties on electron extraction or defect passivation. However, it still lacks of guidelines to update C60-based ETMs with excellent photoelectric properties. In this work, crystallographic data of eight C60-based ETMs, including pristine C60 and the well-known PCBM as well as six newly synthesized fullerenes, are analyzed to establish the connections between derivatized structures and photoelectric properties for the typical carbon cluster of C60. In terms of packing centroid-centroid distance between neighboring carbon cages, the crystallographic data are useful for probing photoelectric properties, such as electrochemical properties, electron mobility and photovoltaic performances, and therefore facilitate to design novel C60-based ETMs for PSCs with high performances.
      PubDate: 2021-10-06
       
  • Chiral Nematic Cellulose Nanocrystals-Magnetite Nanocomposite Films
           Displaying Magnet-modulated Circular Dichroism Activity

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      PubDate: 2021-10-01
       
  • Printing High-resolution Micro-patterns by Solution Processes

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      Abstract: The preparation of high-resolution micro-patterns is urgently demanded for developing opto-/electric-devices in various applications. Generally, solution processes have been commonly used for fabricating micro-patterned surfaces for its mild operation conditions, facile operability and low-cost. In this contribution, we reviewed recent processes on preparing micro-/nano-patterns using solution processes based the viewpoint of resolution, including inkjet printing, photolithography, micro-contact printing, dip-pen nanolithography, and fiber direct writing, etc. Specifically, advantages/disadvantages and development prospects of various solution processes for preparing micro-/nano-patterns are also summarized. We envision that the review will provide inspirations for developing and optimizing various high-resolution micro-/nano-patterns using solution processes.
      PubDate: 2021-10-01
       
  • A Green Approach to Producing Polymer Microparticles for Local Sustained
           Release of Flavopiridol

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      Abstract: Poly(lactic-co-glycolic acid)(PLGA) microparticles represent an important class of materials used for drug delivery. Current synthesis frequently uses conventional emulsion, where dichloromethane(DCM) is used as the organic phase solvent. Due to the health and environmental toxicity of DCM and its slow degradation, this work replaces DCM with a greener solvent, dimethyl carbonate(DMC). To attain narrow distribution of PLGA particle size, microfluidic flow focusing was chosen over conventional emulsion. This new approach successfully produced PLGA microparticles encapsulated with flavopiridol, a kinase inhibitor. These particles exhibit sustained release profile more desirable than the conventional counterparts. The cytotoxicity and activity tests have demonstrated high biocompatibility and efficacy of these PLGA particles. The high sustainability is also evaluated using simple E-Factor(sEF) and complete E-Factor(cEF). The lower health and environmental toxicities of DMC than DCM are evidenced by approximately one order of magnitude higher in lethal dose, i. e., 50%(LD50) values in rat, 5-fold faster degradation rate, and 30% higher GlaxoSmithKline(GSK) combined greenness value. The approach reported in this work shall provide a new and green means for drug delivery in general. The products enable local sustained delivery of flavopiridol for prevention of post-traumatic osteoarthritis, and anti-cancer therapy.
      PubDate: 2021-10-01
       
  • Synthesis of Fluorinated Urchin-like Serried Hydroxyapatite with Improved
           Water Sorption-Solubility and Bioactivity for Dental Composites

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      Abstract: Fluorine is present in the hydroxyapatite mineral in natural tooth enamel, which plays a key role in the prevention of dental caries. The aim of this study is to synthetize the fluorinated urchin-like serried hydroxyapatite(FnUHA) particles with different degrees of fluorine substitution and explore the effect of the fluorine element on the water absorption-solubility, mechanical strength, and biological activity of dental composites. The obtained FnUHA particles were further modified with 3-methacryloxypropyl trimethoxysilane(γ-MPS) to get the silanized FnUHA(SFnUHA) particles, which were then used as the reinforcement for dental composites. The morphology, compositional elements, and structure of the FnUHA were characterized by field-emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), X-ray diffractometer(XRD), and Fourier transform infrared spectrometer (FTIR), respectively. The mechanical properties of the SFnUHA reinforced composites with different filler loadings were measured with a universal testing machine. The results demonstrated that the 50%(mass fraction) SF5UHA filled composite exhibited the acceptable flexural strength and compressive strength, giving the respective improvements of 56.3% and 30.8% compared with those of the 50% SUHA filled composite. In addition, this composite also presented lower water absorption-solubility, better in vitro bioactivity, and excellent cell viability. Therefore, fluorinated hydroxyapatite is a promising filler to improve the mechanical properties and functionality of dental composites.
      PubDate: 2021-10-01
       
  • A DFT Investigation on the Electronic Structures and Au Adatom Assisted
           Hydrogenation of Graphene Nanoflake Array

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      Abstract: Graphene nanoribbons with zigzag edges(ZGNRs) have attracted much attention for their spin-polarized edge states predicted more than 15 years ago. Since the ZGNRs are fabricated on metal substrates using molecular precursors, due to their strong coupling with metal substrates, experimental detection of the spin-polarized edge states is still difficult. Here, we design a partially hydrogenated graphene(PHGr), in which periodic hexagonal graphene nanoflakes(GNFs) with zigzag boundaries are embedded in a hydrogenated graphene layer. Using density functional theory(DFT) based first-principles calculations, we find that the hexagonal GNFs exhibit spin-polarized boundary states at their opposite zigzag boundaries, which is similar with the bow-tie-shaped GNFs and ZGNRs. DFT calculations demonstrate that the PHGr is a semiconductor with an antiferromagnetic ground state. Moreover, the antiferromagnetic boundary states and semiconducting properties keep unchanged when the size of GNF varies from 1.4 nm to 2.3 nm. The robustness of the spin-polarized boundary states enables this PHGr as a robust material for detecting spin-polarized boundary states coming from zigzag boundaries. In addition, we find that single Au atoms selectively adsorbed on boundaries catalyze H2 dissociation and therefore lower the barrier of graphene hydrogenation. Therefore, the PHGr can be used not only in carbon-based spintronic devices but also as a platform for single atom catalyst.
      PubDate: 2021-10-01
       
  • Recent Progresses on the High Performance Organic Electrochemical
           Transistors

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      Abstract: Organic electrochemical transistor(OECT) with bulk current modulation capability based on the ion penetration into the organic semiconducting channel exhibits unique features, including high transconductance, low voltage and large capacitance. The high current at a low voltage, together with the compatibility with aqueous environment, makes OECT particularly suitable for bioelectronic applications, such as biological interfacing, printed logic circuitry and neuromorphic devices. However, the operation mechanism and structure-performance relationship of OECT are rather complicated and remain unclear to date. One of the critical issues is the ion penetration and transportation process. This review focuses on the research progresses of how to improve the OECT performance specifically through materials design, interfacing and morphology modulation. Different strategies of promoting the ion doping process are compared and discussed in order to optimize the device performance so that a deep understanding of the OECT operation principle could be gained.
      PubDate: 2021-09-20
       
  • Repair Strategies for Perovskite Solar Cells

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      Abstract: In recent years, organic-inorganic hybrid halide perovskite solar cells(PSCs) have obtained rapid development due to their excellent optoelectronic properties and low fabrication cost. However, owing to the environmental sensitivity of perovskite materials, the instability of PSCs is the key issue hindering its commercialization. Developing feasible strategy to repair the degraded PSCs stands for effective and unique means to prolong the operational lifetime of PSCs. Herein, we summarize various methods to repair the degraded PSCs under the influence of different environmental conditions. Along with the repairing process, the optoelectronic properties of perovskite film as well as the corresponding PSCs are discussed. Some suggestions on how to further improve the intrinsic stability of perovskite and repairing effect of PSCs are also provided.
      PubDate: 2021-09-20
       
  • Glaser Coupling of Substituted Anthracene Diynes on a Non-metallic Surface
           at the Vapor-Solid Interface

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      Abstract: The direct polymerization via irreversible C-C coupling on inert substrates will give access to new low-dimensional advanced functional materials and simplify their industrial fabrication. In this work, we present our initial results in the application of Glaser coupling to the direct on-surface polymerization of a model diacetylene compound at the solid-vapor interface. The self-assembly of the monomer and polymerization products was characterized using scanning tunneling microscopy (STM). In addition, selected optical properties and the electronic structure of all compounds were investigated.
      PubDate: 2021-09-18
       
  • Supramolecular Self-assembly of Amphiphilic Alkynylplatinum(II)
           2,6-Bis(N-alkylbenzimidazol-2′-yl)pyridine Complexes

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      Abstract: Alkynylplatinum(II) bzimpy complexes of trimethylammoniumbenzylethynyl ligand have been synthesized and characterized. Complexes with long alkyl chains have been found to exhibit interesting self-assembly properties in the acetonitrile solution. The amphiphilic nature of the complexes has led to the formation of nanorods, as revealed by electron microscopy experiments. Further increasing the polarity of the solvent media has given rise to the enhancement of low-energy emission.
      PubDate: 2021-09-18
       
  • Enhanced Electrochemical Performance of Na0.67Fe0.5Mn0.5O2 Cathode with
           SnO2 Modification

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      Abstract: P2-type layered oxide Na0.67Fe0.5Mn0.5O2 is recognized as a very promising cathode material for sodium-ion batteries due to the merits of high capacity, high voltage, low cost, and easy preparation. However, its unsatisfactory cycle and rate performances remain huge obstacles for practical applications. Here, we report a strategy of SnO2 modification on P2-type Na0.67Fe0.5Mn0.5O2 to improve the cycle and rate performance. Scanning electron microscope(SEM) and transmission electron microscope(TEM) images indicate that an insular thin layer SnO2 is coated on the surface of Na0.67Fe0.5Mn0.5O2 after medication. The coating layer of SnO2 can protect Na0.67Fe0.5Mn0.5O2 from corrosion by electrolyte and the cycle performance is well enhanced. After 100 cycles at 1 C rate(1 C=200 mA/g), the capacity of SnO2 modified Na0.67Fe0.5Mn0.5O2 retains 83 mA·h/g(64% to the initial capacity), while the capacity for the pristine Na0.67Fe0.5Mn0.5O2 is only 38 mA·h/g(33.5% to the initial capacity). X-Ray photoelectron spectroscopy reveals that the ratio of Mn4+ increases after SnO2 modification, leading to less oxygen vacancy and expanded lattice. As a result, the capacity of Na0.67Fe0.5Mn0.5O2 increases from 178 mA·h/g to 197 mA·h/g after SnO2 modification. Furthermore, the rate performance of Na0.67Fe0.5Mn0.5O2 is enhanced with SnO2 coating, due to high electronic conductivity of SnO2 and expanded lattice after SnO2 coating. The capacity of SnO2 modified Na0.67Fe0.5Mn0.5O2 at 5 C increases from 21 mA·h/g(pristine Na0.67Fe0.5Mn0.5O2) to 35 mA·h/g.
      PubDate: 2021-09-18
       
  • Contemporary Approaches to α,β-Dehydroamino Acid Chemical
           Modifications

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      Abstract: As one of the most common unnatural amino acids(uAAs), α, β-dehydroamino acids(α,β-dhAAs) can be found in various ribosomally synthesized and post-translationally modified peptides(RiPPs) and other naturally occurring peptides. In recent years, novel reactions for α,β-dhAA modification continue to emerge. Due to their unique electrophilicity different from 20 natural amino acids, α,β-dhAAs, especially dehydroalanine(Dha), have become powerful tools for site-selective protein modification. In this review, we mainly focus on the latest research progress of C—C and C-heteroatom(C—X, X=S, N, Se, Si, P, B) bond formation methods based on α,β-dhAAs in the past five years. Particularly, we pay much attention to the α,β-dhAA derivatization methodologies used in the late-stage modification for natural peptides and proteins. In addition, we also focus on the downstream functionalization and therapeutic biologic applications of these modifications.
      PubDate: 2021-09-18
       
  • A One-pot-synthesized Double-layered Anticoagulant Hydrogel Tube

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      Abstract: Extracorporeal membrane oxygenation(ECMO) has emerged as a viable treatment in severe cases of acute respiratory distress syndrome, acute respiratory failure, and adult respiratory distress syndrome. However, thromboembolic events stemming from the use of ECMO devices results in significant morbidity and mortality rates; the inner surface of the ECMO tubing comes into contact with the blood and can readily initiate coagulation. In addition, the tubing needs to be continually replaced due to thromboses on the inner tube wall, which not only increases the risk of infection but also the economic burden. Despite considerable effort, a surface modification strategy that effectively addresses these challenges has not yet been realized. In this study, we developed an integrated hollow core-shell-shell hydrogel tube of gelatin/alginate/acrylamide-bacterial nanocellulose(GAA) that meets the anticoagulant requirements for the inner tubing layer as well as the highly elastic soft material needed for the outer layer. Using static blood from healthy volunteers, we confirmed that the platelets or coagulation is not stimulated by the GAA tubing. Importantly, experiments with dynamic blood also demonstrated that the inner layer of the tubing does not elicit blood clotting. The one-pot-synthesized process may provide guidance for the design of anticoagulation tubes used clinically.
      PubDate: 2021-09-04
      DOI: 10.1007/s40242-021-1267-3
       
  • Growth of Single-walled Carbon Nanotubes on Substrates Using Carbon
           Monoxide as Carbon Source

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      Abstract: The growth of single-walled carbon nanotubes(SWCNTs) on substrates has attracted great interests because of the potential applications in various fields. Carbon monoxide(CO) was used as the carbon source for the growth of SWCNTs on silicon substrates. Random or oriented SWCNTs can be produced by varying the CO flow rate. When the flow rate of CO was as low as 20 sccm(sccm: standard cubic centimeter per minute), dense SWCNT networks with clean surface were produced. When the flow rate was above 50 sccm, vertically aligned SWCNT(VA-SWCNT) arrays were grown. Well-aligned VA-SWCNT arrays were obtained in the temperature range of 650–800 °C and the content of large-diameter(above 1.7 nm) tubes in the array increased with the temperature. The height of the array was affected by the growth temperature, the CO flow rate, and the growth time. These findings indicate CO can be used as an efficient carbon source for the growth of SWCNTs on substrates under low flow rates.
      PubDate: 2021-09-04
      DOI: 10.1007/s40242-021-1277-1
       
  • Surface-enhanced Raman Scattering of Self-assembled Superstructures

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      Abstract: Surface-enhanced Raman scattering(SERS) is a molecular specific spectroscopic technique that amplifies the Raman signal of absorbed molecules for up to 1010 times. Over the past decades, SERS substrates experienced rapid growth, resulting in excellent development for SERS analysis. Because the surface plasmonic resonance coupling between individual materials can form a “hotspot” region to maximize the Raman signal, among many substrate construction strategies, self-assembly attracts more attention in constructing superstructures with strong, uniform and stable SERS activity. In addition, a number of plasmon-free nanomaterials with appropriate superstructures samely show enhanced SERS activity, which is primarily attributed to the formation of the optical resonator. This review aims to provide a scientific synopsis on the progress of self-assembled superstructures for SERS and ignite new discoveries in the SERS platform, as well as SERS applications in various fields.
      PubDate: 2021-09-04
      DOI: 10.1007/s40242-021-1263-7
       
  • Calcium Ion Coordinated Polyamide Nanofiltration Membrane for Ultrahigh
           Perm-selectivity Desalination

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      Abstract: Improving the permeate flux but retaining the rejection of thin-film composite(TFC) polyamide nanofiltration(NF) membrane is a high requirement for desalination. In this work, a calcium ion(Ca2+) coordinated polyamide(PA) NF membrane was prepared by directly adding CaCl2 to the piperazine(PIP) aqueous solution during the interfacial polymerization process. Due to the coordination interaction between Ca2+ and the amide bond in PA active layer, the number of hydrogen bonds in the PA active layer was reduced, causing in turn the decrease of physical cross-linking degree. As a consequence, the pore of the PA active layer was enlarged, prominently enhancing the water permeance of NF membrane. With the increase of CaCl2 concentration, the pure water flux of TFC NF increased significantly while the rejection of Na2SO4 decreased sightly. Compared with TFC NF membrane prepared without CaCl2, the permeate flux of the Ca2+ coordinated polyamide NF membrane prepared under optimal conditions was increased by 3–4 folds with Na2SO4 rejection of 95.26%. Meanwhile, such a Ca2+ coordinated PA NF membrane showed a better SO42−/Cl− selectivity.
      PubDate: 2021-09-04
      DOI: 10.1007/s40242-021-1270-8
       
 
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