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  Subjects -> CHEMISTRY (Total: 849 journals)
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    - CHEMISTRY (598 journals)
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CHEMISTRY (598 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: 32)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 17)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 226)
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: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 53)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
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: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 14)
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: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
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: 26)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 159)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 210)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 1)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 3)
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: 14)
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: 3)
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: 282)
Biochemistry Insights     Open Access   (Followers: 5)
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: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 108)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 93)
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: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 67)
Catalysis for Sustainable Energy     Open Access   (Followers: 6)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 7)
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: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 173)
Chemical Science     Open Access   (Followers: 21)
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: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
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: 147)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
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: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 250)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
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)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
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: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
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: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 11)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 57)
Dalton Transactions     Full-text available via subscription   (Followers: 19)
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: 4)
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: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        1 2 3 | Last

Journal Cover Cellulose
  [SJR: 1.167]   [H-I: 71]   [7 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-882X - ISSN (Online) 0969-0239
   Published by Springer-Verlag Homepage  [2355 journals]
  • Development of nanofibrillated cellulose coated with gold nanoparticles
           for measurement of melamine by SERS
    • Authors: Ziyi Xiong; Xiaowei Chen; Polly Liou; Mengshi Lin
      Pages: 2801 - 2811
      Abstract: The objective of this study was to develop nanofibrillated cellulose (NFC)-based substrate for rapid detection of melamine in milk by surface-enhanced Raman spectroscopy (SERS). NFC were served as a highly porous platform to load with gold nanoparticles (AuNPs), which can be used as a flexible SERS substrate with nanoscale roughness to generate strong electromagnetic field in SERS measurement. The NFC/AuNP substrate was characterized by UV–Vis spectroscopy and electron microscopy. Milk samples contaminated by different concentrations of melamine were measured by SERS coupled with NFC/AuNP substrate. The spectral data analysis was conducted by multivariate statistical analysis [i.e. partial least squares (PLS)]. Satisfactory PLS result for quantification of melamine in milk was obtained (R = 0.9464). The detection limit for melamine extracted from liquid milk by SERS is 1 ppm, which meets the World Health Organization’s requirement of melamine in liquid milk. These results demonstrate that NFC/AuNP substrate has improved homogeneity and can be used in SERS analysis for food safety applications.
      PubDate: 2017-07-01
      DOI: 10.1007/s10570-017-1297-7
      Issue No: Vol. 24, No. 7 (2017)
       
  • Surface modification of PCC filled cellulose paper by MOF-5 (Zn 3 (BDC) 2
           ) metal–organic frameworks for use as soft gas adsorption composite
           materials
    • Authors: Qiang Yang; Meiyun Zhang; Shunxi Song; Bin Yang
      Pages: 3051 - 3060
      Abstract: In this paper, composite materials made of cellulose paper and MOF-5 (Zn3(BDC)2) Metal organic frameworks (paper@MOF-5) materials, were prepared by an in situ synthesis method using precipitated calcium carbonate (PCC) filled cellulose papers. PCC fillers in the cellulose paper led to decreased inter-fiber bonds, thus facilitating the formation of small-sized MOF-5 crystals. The resultant cellulose paper@MOF-5 composites exhibited zeolite-like frameworks with high specific surface areas. The composite materials were characterized by XRD, ATR-FTIR, SEM and nitrogen adsorption analysis. The results supported the conclusion that the prepared cellulose paper@MOF-5 composite materials have great potential in gas (N2, CH4, H2, CO2, etc.) adsorption.
      PubDate: 2017-07-01
      DOI: 10.1007/s10570-017-1331-9
      Issue No: Vol. 24, No. 7 (2017)
       
  • Real-time dyebath monitoring of reactive dyeing on cationized cotton for
           levelness control: part 2—effects of leveling agents and dye dosing
    • Authors: Sha Fu; Matthew J. Farrell; Peter J. Hauser; David Hinks; Warren J. Jasper; Mary A. Ankeny
      Pages: 3061 - 3071
      Abstract: Cationization of cotton brings advantages in the reactive dyeing process, such as eliminating the use of electrolytes and increasing color yield. However, high dye strike rates caused by the electronic attractions between anionic dyes and cationized cotton may result in poor levelness of dyeing, especially for light shades. For some monochloritriazine–monochloritriazine homobifunctional reactive dyes, lowering dyeing temperature and controlling the addition of electrolytes can effectively control the dye strike rate and improve the levelness of dyed cationized cotton. However, for other reactive dyes, the use of effective leveling agents is necessary. In this study, a variety of anionic, cationic, and amphoteric leveling agents were applied to control the dye exhaustion process of three monochloritriazine–vinylsulphone heterobifunctional reactive dyes on the cotton fabric cationized using 3-chloro-2-hydroxypropyl trimethylammonium chloride. The leveling effect of adding dyes in portions was also evaluated and it was used in combination with leveling agents to further improve the levelness of dyeing.
      PubDate: 2017-07-01
      DOI: 10.1007/s10570-017-1291-0
      Issue No: Vol. 24, No. 7 (2017)
       
  • Effect of anti-creasing component on properties of two-ply cotton yarn
    • Authors: Yunli Wang; Genyang Cao; Liangjun Xia; Dan Sheng; Shan Jiang; Heng Pan; Ying Wang; Jun Chen; Yuping Chen; Weilin Xu
      Pages: 3073 - 3082
      Abstract: Durable press finishing is a common process used to impart wrinkle-free properties to cotton fabrics through the crosslinking of cellulose macromolecules. Unfortunately, this process results in a loss of fabric strength and decreases the durability of garments. If the content of crosslinked fibers is reduced in the fabrics, their strength would be retained to a greater extent. In addition, hydrophilic property, permeability, and quality of fabrics could be improved. In the past, researchers primarily focused on the strength of the whole fabric. In this study, single cotton yarns were treated with formaldehyde-based N-methylol finishing agents. Subsequently, they were plied together according to different proportions, and then further cured at a certain temperature. The tensile strength, elongation at break, breaking time, work of rupture and bending rigidity were used to investigate the effects of the treatment on the mechanical properties of cotton yarns. Wrinkle recovery angle was used to evaluate the anti-creasing property of the yarns. The results suggest that when the yarns are plied together in different proportions, their mechanical and anti-creasing properties change with the treatment to which they have been subjected as well as with their blending proportion. Moreover, a reduced anti-creasing yarn proportion decreased the amount of formaldehyde released. This study will guide further development of environmentally friendly anti-crease processing methods.
      PubDate: 2017-07-01
      DOI: 10.1007/s10570-017-1304-z
      Issue No: Vol. 24, No. 7 (2017)
       
  • Producing colored cotton fabrics with functional properties by combining
           silver nanoparticles with nano titanium dioxide
    • Authors: Akram Jafari-Kiyan; Loghman Karimi; Abolfazl Davodiroknabadi
      Pages: 3083 - 3094
      Abstract: In this study, functional cotton fabrics were prepared by applying titania as a photocatalyst and using silver nanoparticles as both a novel class of colorant for coloration and an agent capable of modifying the TiO2 nanoparticles. Silver colloids with different colors were primarily synthesized through reduction of silver nitrate and then coloration of cotton fabrics and synthesis of Ag/TiO2 nanocomposite on fabric surface was performed by adding titanium dioxide nanoparticles (P25) in an ultrasonic bath. The treated cotton fabrics were characterized by field emission scanning electron microscope, energy-dispersive X-ray spectroscopy, X-ray diffraction and UV–Vis reflectance spectroscopy. The color effect, self-cleaning property, antibacterial efficiency, ultraviolet (UV) blocking activity and hydrophobicity of the samples were also studied. The results indicated that all properties of the treated cotton fabric with Ag/TiO2 nanocomposite were superior compared to the treated sample with TiO2 alone. Moreover, the photocatalytic activity of titanium dioxide has no negative effect on fabric color and the color variation of treated fabric after UV irradiation was negligible.
      PubDate: 2017-07-01
      DOI: 10.1007/s10570-017-1308-8
      Issue No: Vol. 24, No. 7 (2017)
       
  • Erratum to: Dry jet-wet spinning of strong cellulose filaments from ionic
           liquid solution
    • Authors: Lauri K. J. Hauru; Michael Hummel; Anne Michud; Herbert Sixta
      Pages: 3109 - 3110
      PubDate: 2017-07-01
      DOI: 10.1007/s10570-017-1305-y
      Issue No: Vol. 24, No. 7 (2017)
       
  • Swelling properties and generation of cellulose fines originating from
           bleached kraft pulp refined under different operating conditions
    • Authors: Konrad Olejnik; Bogdan Skalski; Anna Stanislawska; Agnieszka Wysocka-Robak
      Abstract: Cellulose fines are—in general—small particles removed from natural cellulose fibres during refining process which is typically carried out in papermaking industry. Fines have been recognized as a separate component of papermaking fibrous raw material since their properties differ considerably from those of cellulosic fibres. Fines are characterized by low dewatering ability, very high specific surface area, and high swelling ability. Knowledge about the possibility of effective control over fines generation and swelling during refining process are nowadays of key importance. Beside its significance in papermaking process (e.g. impact on paper structure and mechanical properties and dewatering properties of the pulp), nowadays the cellulose fines fraction is considered as a raw material for the production of novel materials e.g. microfibrilled cellulose and nanocellulose. The main objective of the presented study was to determine the impact of the most important refining parameters (e.g. net refining energy, rotor speed, and pulp consistency) which could be used to control the fines development and their swelling degree. On the basis of presented research results it may be concluded that the amount of the fines generated during refining process was mainly affected by the effective refining power (net power) and the rotational speed of the refiner rotor. Also, the final swelling degree of fines varies depending on the refining operating conditions used. It was found that the swelling degree of fines was mostly influenced by the rotational speed of the refiner rotor, refined pulp consistency, and—for very low consistency (1–2%)—also pulp volumetric flow rate through the refiner. As a result, it could be concluded that—for more effective control of the refining process—greater attention to the control of these parameters should be paid.
      PubDate: 2017-07-08
      DOI: 10.1007/s10570-017-1404-9
       
  • Mechanically ground softwood fines as a raw material for cellulosic
           applications
    • Authors: Hannes Orelma; Atsushi Tanaka; Hille Rautkoski; Ilkka Nurminen; Jarmo Kouko; Antti Koponen
      Abstract: Utilization of mechanically manufactured lignocellulosic fines (LCNFs) was investigated in making filaments and films. The LCNFs particles were prepared by using a mechanical grinding method with a w-profile grinding stone that produces mostly fines with dimensions in the micrometer scale. The chemical and elemental composition of the w-stone ground LCNFs particles was investigated. It was found that the mechanically manufactured material exhibited the chemical structure of native wood. The LCNFs particles had an anionic surface charge making them colloidally semi-stable in water. The short length of the fines particles prevents their effective mechanical entanglement, which sets some limitations on preparation of filaments and films. Filament manufacturing required the use of a composite approach with carboxymethyl cellulose (CMC) as a binder polymer. The filament was manufactured by using dry-jet wet spinning with aluminium sulfate crosslinking. The chemical composition, crosslinking mechanism, and mechanical properties of the composite filaments were investigated. The composite approach with CMC was also used to prepare composite films with good mechanical performance. The investigated LCNFs material could be utilized in all-lignocomposite applications with cellulose derivatives, where biodegradability and biobased characteristics are desired properties.
      PubDate: 2017-07-08
      DOI: 10.1007/s10570-017-1403-x
       
  • Preparation of phthalocyanine-bound myristoyl celluloses for photocurrent
           generation system
    • Authors: Yasuko Saito; Hiroshi Kamitakahara; Toshiyuki Takano
      Abstract: The influences of two structural modifications on the photocurrent generation performance of the Langmuir–Blodgett (LB) film of the 6-O-phthalocyaninyl cellulose derivative were investigated. These structural modifications were the substituent groups at the O-2 and O-3 positions, and the central metal of the phthalocyanine moiety. Specifically, 6-O-Zn/phthalocyaninyl- (8a) and Pd/phthalocyaninyl (8b) -2,3-di-O-myristoylcelluloses were prepared instead of 6-O-Zn/phthalocyaninyl-2,3-di-O-myristylcellulose (2). The LB monolayer film of compound 8a on an indium thin oxide electrode showed higher photocurrent generation performance than that of compound 2. This suggested that myristoyl groups (C-14 acyl groups) were more beneficial to photocurrent generation than myristyl groups (C-14 alkyl groups), as the substituent at the O-2 and O-3 positions. The LB monolayer film of compound 8b showed photocurrent generation from 500 to 700 nm, although a blue-shift in the Q-band maximum was observed. The photocurrent generation performance of compound 8b was significantly higher than that of compound 8a. This indicated that Pd was more beneficial to photocurrent generation than Zn. The film of compound 8b prepared by the horizontal lifting method showed better photocurrent generation performance than that prepared by the vertical dipping method. Consequently, compound 8b is a complementary material to the porphyrin-appended cellulose derivative (1) for photocurrent generation system.
      PubDate: 2017-07-08
      DOI: 10.1007/s10570-017-1400-0
       
  • Effect of coexisting salt on TEMPO-mediated oxidation of wood cellulose
           for preparation of nanocellulose
    • Authors: Toru Inamochi; Ryunosuke Funahashi; Yasutaka Nakamura; Tsuguyuki Saito; Akira Isogai
      Abstract: The influence of coexisting salt in 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation of wood cellulose in water at pH 10 for 100 min was investigated, in which Na2SO4 was partly used in place of NaBr in the conventional TEMPO/NaBr/NaClO oxidation system. The amount of NaBr could be reduced from 1 to 0.2 mmol/g-wood cellulose by adding 0.4 mmol/g Na2SO4. This introduced a carboxylate content of ~1.2 mmol/g, which is sufficient to prepare TEMPO-oxidized cellulose nanofibrils (TOCNs) by mechanical disintegration of the oxidized cellulose in water. When no NaBr was used and Na2SO4, Na2SO3, NaCl or CH3COONa was instead used as a coexisting salt in TEMPO/NaClO oxidation, the oxidized celluloses had carboxylate contents of 0.6–0.8 mmol/g, which are insufficient to prepare TOCNs with nanofibrillation yields >55%. The viscosity-average degrees of polymerization of the resulting TEMPO-oxidized celluloses were in the range 420–450, indicating that depolymerization of cellulose is not governed by the carboxylate content of the TEMPO-oxidized cellulose but rather by the oxidation time.
      PubDate: 2017-07-07
      DOI: 10.1007/s10570-017-1402-y
       
  • Modification of cotton fabric with graphene and reduced graphene oxide
           using sol–gel method
    • Authors: Dorota Kowalczyk; Witold Fortuniak; Urszula Mizerska; Irena Kaminska; Tomasz Makowski; Stefan Brzezinski; Ewa Piorkowska
      Abstract: Cotton fabrics were modified by xerogel coatings with dispersed particles of graphene (Gr) or reduced graphene oxide (RGO). To obtain a stable dispersion of Gr or RGO in organo-silicon sol, sodium lauryl sulfate as an anionic surfactant was used. The fabrics were padded with the organo-silicon sol containing dispersed Gr or RGO, forming a thin xerogel coating after drying. The fabrics coated with the xerogel containing 0.5–1.5 wt% of RGO or Gr were prepared and examined. The best anti-static properties were obtained for the coating with 1.5 wt% of Gr, whose surface resistance and volume resistance were on the order of 105 and 103 Ω, respectively. Such properties make the fabric suitable for protective cloths in the environment with explosive atmosphere.
      PubDate: 2017-07-07
      DOI: 10.1007/s10570-017-1389-4
       
  • Pretreatment of alfalfa stems by wood decay fungus Perenniporia
           meridionalis improves cellulose degradation and minimizes the use of
           chemicals
    • Authors: Carolina Girometta; Alberto Zeffiro; Marco Malagodi; Elena Savino; Enrico Doria; Erik Nielsen; Armando Buttafava; Daniele Dondi
      Abstract: Enzymes of wood decay fungi can be exploited to degrade lignocellulosic wastes for sustainable production of bioethanol. Perenniporia meridionalis was tested for growing at different temperatures on stems of alfalfa. The process aims to produce fermentable sugars and can be divided into the following steps: (1) fungal treatment to degrade lignin, (2) microwave pretreatment in water or in phosphoric acid, and (3) enzymatic hydrolysis of cell wall carbohydrates. Thermogravimetric analysis assessed the biomass content of cellulose and lignin after the fungal treatment. Throughout all steps HPLC analysis of sugars, oligomers and by-products (furfural, hydroxymethylfurfural and acids) was performed. Scanning electron microscopy was used for visual inspection and characterization of the experimental material during the treatments. The P. meridionalis pretreatment enhanced the yield of fermentable sugars obtainable by enzymatic hydrolysis in samples subjected to microwave-assisted pretreatment in water, but not in those in acid medium. This is probably related to the very selective removal of lignin by P. meridionalis, exposing cellulose fibers without depleting them. Furthermore, microwave treatment in water produced less byproducts than in acid medium. By exploiting the P. meridionalis lignin degradation is therefore possible to avoid H3PO4 use during the alfalfa stem pre-treatment, reducing economic and environmental impacts.
      PubDate: 2017-07-06
      DOI: 10.1007/s10570-017-1395-6
       
  • Microwave-assisted synthesis of silver/reduced graphene oxide on cotton
           fabric
    • Authors: Can Wang; Ronghui Guo; Jianwu Lan; Shouxiang Jiang; Zhouyi Zhang
      Abstract: Silver/reduced graphene oxide (Ag/RGO) coatings were synthesized on cotton fabric through an efficient chemical reduction method under the microwave irradiation. The as-synthesized samples were characterized by X-ray photoelectron spectroscopy, thermogravimetric analysis and scanning electron microscope. Surface resistance, heat generation, electromagnetic interference (EMI) shielding effectiveness (SE), hydrophobicity of the Ag/RGO coated cotton fabric were evaluated. Adhesive strength between the Ag/RGO coating and cotton fabric was also studied. The results show that cotton fabric is uniformly and densely covered with silver nanoparticles and reduced graphene oxide (RGO) nanosheets. Compared with Ag and RGO coated cotton fabrics, Ag/RGO coated cotton fabric possesses low surface resistance with 5.61 Ω/sq and an excellent EMI SE which is more than 40 dB at the frequencies ranging from 1 to 18 GHz. In addition, Ag/RGO coated cotton fabric exhibit hydrophobicity with a water contact angle of 135.1° and an excellent heat generation which can keep at temperature from 17.5 to 61.3 °C.
      PubDate: 2017-07-04
      DOI: 10.1007/s10570-017-1392-9
       
  • Enzymatically hydrolyzed and TEMPO-oxidized cellulose nanofibers for the
           production of nanopapers: morphological, optical, thermal and mechanical
           properties
    • Authors: Quim Tarrés; Sami Boufi; Pere Mutjé; Marc Delgado-Aguilar
      Abstract: In the present study, CNF prepared by TEMPO-mediated oxidation and enzymatic hydrolysis were used for the production of nanopapers using a papermaking-like route. Nanopapers were characterized in terms of tensile, thermal, optical and morphological properties. Those prepared from enzymatically hydrolyzed CNF were found to be weaker at tensile than those resulting from TEMPO-mediated oxidation, but with similar level of stiffness. Enzymatically obtained CNF presented lower transparency due to their higher diameter and lower fibrillation yield. Moreover, TEMPO-oxidized CNF presented lower onset of the thermal degradation temperature (230 °C) due to the presence of carboxylic groups. Overall, the influence of increasing the amount of enzyme during enzymatic hydrolysis and the amount of sodium hypochlorite during TEMPO-mediated oxidation was assessed as function of the ultimate properties of nanopapers.
      PubDate: 2017-07-04
      DOI: 10.1007/s10570-017-1394-7
       
  • Enzyme-assisted mechanical production of microfibrillated cellulose from
           Northern Bleached Softwood Kraft pulp
    • Authors: Xiaofei Tian; Peng Lu; Xueping Song; Shuangxi Nie; Yang Liu; Mingyou Liu; Zhiwei Wang
      Abstract: This paper examines the mechanism of an enzyme pre-treatment on mechanical preparation of microfibrillated cellulose (MFC), the effects of hemicellulase and cellulase, on enhancing of the PFI refining efficiency of Northern Bleached Softwood Kraft pulp for fiber’s devillicate, and changing of morphologies and physical characteristics on fibers, such as specific surface area were investigated, respectively. It was revealed that the enzyme pre-treatment could promote (1) an acceleration of fine productivity from the fibers, (2) intensive reduction of the size of the fibers through mechanical cutting and (or) fibrillation, and (3) energy efficiency in the reduction of fiber length without productivity impairment. However, distinct mechanical actions on the fibers pre-treated with hemicellulase and cellulase were indicated, according to the dissimilar fibrillation patterns and morphological properties found in the MFC product through intensive mechanical refining.
      PubDate: 2017-07-04
      DOI: 10.1007/s10570-017-1382-y
       
  • Characterization of cellulose nanofibrils prepared by direct
           TEMPO-mediated oxidation of hemp bast
    • Authors: Buapan Puangsin; Hiroto Soeta; Tsuguyuki Saito; Akira Isogai
      Abstract: Hemp bast (α-cellulose 79.4%, Klason lignin 4.9%) was directly oxidized by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation in water at pH 10 and room temperature for 2 h. The level of added NaClO in oxidation varied from 5 to 30 mmol/g (based on dry weight of hemp bast). Weight recovery ratios of the TEMPO-oxidized hemp bast celluloses were in the range of 81–91%, and their carboxylate contents increased up to 1.2 mmol/g with the increased NaClO addition level. The lignin contents decreased to 0.5–0.9% after oxidation, and the viscosity-average degrees of polymerization decreased from 1100 to 560 because of depolymerization during oxidation. Thus, direct TEMPO-mediated oxidation of hemp bast introduced a significant number of carboxylate groups and simultaneously achieved sufficient delignification. Small amounts of xylose, mannose, and rhamnose originating from hemicelluloses remained in the TEMPO-oxidized hemp bast samples prepared by oxidation with 5–20 mmol/g NaClO. However, oxidation with 30 mmol/g NaClO completely removed these hemicellulose-originating sugars, and produced almost pure TEMPO-oxidized cellulose. When TEMPO-oxidized hemp bast samples were mechanically disintegrated in water, their nanofibrillation yields were 58–65%. After removal of unfibrillated fractions by centrifugation, transparent dispersions showed birefringence when observed between cross-polarizers, while atomic force microscopy images showed near-individually dispersed nanofibril elements with widths of ~2 nm.
      PubDate: 2017-07-03
      DOI: 10.1007/s10570-017-1390-y
       
  • Herbal products on cellulosic fabric with controlled release: comparison
           of in situ encapsulation and UV curing of the prepared nanocapsules
    • Authors: Soraya Ghayempour; Majid Montazer
      Abstract: The application method of essential oils and plant extracts in micro/nanocapsules on textiles can affect the properties of the fabric due to evaporation. This paper presents a comparative study on different applications of encapsulated herbal products on cotton fabric. UV curing of nanocapsules and simultaneous encapsulation/stabilization were used to prepare a controllable release essential oils on cotton fabric. FESEM images indicated well stabilized nanocapsules on the cotton fabric in both methods. FT-IR and UV–Vis analysis confirmed the presence of the encapsulated peppermint oil on the cotton fabric. There was longer controlled release and increased stiffness found in the samples prepared with UV curing, while there was lower weight and thickness, improved water retention, and ameliorated water absorbency in the sample produced with simultaneous encapsulation/stabilization. Further, better durability and prolonged release of antimicrobial, fragrance, and insect repellent agents can be obtained by UV curing method of the textiles, while the simultaneous encapsulation/stabilization method is more suitable for disposable applications such as wound dressings or medical textiles.
      PubDate: 2017-07-03
      DOI: 10.1007/s10570-017-1385-8
       
  • Antimicrobial paper obtained by dip-coating with modified guanidine-based
           particle aqueous dispersion
    • Authors: Dafu Wei; Zongliang Li; Hao Wang; Jie Liu; Huining Xiao; Anna Zheng; Yong Guan
      Abstract: Nonbiodegradable features and the lack of antimicrobial activity for conventional synthetic polymer-based packaging materials remain as extensive concerns for environmental issues and food safety. In this work, an antimicrobial copolymer PHGH–PPGDE was synthesized via a reaction between polyhexamethylene guanidine hydrochloride (PHGH) and poly(propylene glycol)diglycidyl ether (PPGDE). The obtained PHGH–PPGDE was amphiphilic, antimicrobial and reactive due to the terminal reactive group. The TEM images indicated that PHGH–PPGDE formed aggregated particles dispersed in water. The antimicrobial paper was conveniently prepared by dip-coating a paper matrix in the PHGH–PPGDE aqueous dispersion, or mixing the dispersion with pulp. The resultant paper showed excellent antimicrobial activities against Escherichia coli and improved durability for the nonleaching effect.
      PubDate: 2017-07-03
      DOI: 10.1007/s10570-017-1386-7
       
  • Preparation and characterization of active cellulose-based papers modified
           with TiO 2 , Ag and zeolite nanocomposites for bread packaging application
           
    • Authors: Anca Mihaly-Cozmuta; Anca Peter; Grigore Craciun; Anca Falup; Leonard Mihaly-Cozmuta; Camelia Nicula; Adriana Vulpoi; Monica Baia
      Abstract: This study addresses the preparation and characterization of three active cellulose-based papers containing TiO2, Ag–TiO2 and Ag–TiO2–zeolite nanocomposites (P–TiO2, P–Ag–TiO2, P–Ag–TiO2–Z) and is aimed at use in bread packaging. It is organized in two parts: (1) the first part covers the morpho-structural characterization of nanocomposites and paper sheets (X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, energy dispersive X-ray) and explores some properties of the papers sheets (photocatalytic activity, wettability, barrier properties); (2) in the second part, the comparative efficiency of papers in the bread storage is discussed in terms of acidity, nutritional parameters (total fat, proteins and carbohydrates) and yeasts and molds charge. Morpho-structural investigations revealed a heterogeneous distribution of nanocomposites in the cellulose network as single particles or agglomerates. The higher content of active agents in the P–Ag–TiO2–Z positively affects the hydrophobicity, roughness, photocatalytic activity, opacity and water vapor permeability the most as compared to P–P (plain paper), P–TiO2 and P–Ag–TiO2. The free channels inside the zeolite structure result in the poorest barrier properties against air and grease of P–Ag–TiO2–Z and the highest food simulants–paper contact angles. Packaging tests indicate P–Ag–TiO2 as the most effective in the preservation of nutritional compounds in the bread. In return, P–Ag–TiO2–Z prolongs the microbiological safety of bread in terms of yeasts and molds content for 10 days at 20 °C and 12 days at 4 °C, 2 days longer than the second-ranked P–Ag–TiO2.
      PubDate: 2017-07-03
      DOI: 10.1007/s10570-017-1383-x
       
  • Chitosan as an eco-friendly inhibitor for copper corrosion in acidic
           medium: protocol and characterization
    • Authors: A. Jmiai; B. El Ibrahimi; A. Tara; R. Oukhrib; S. El Issami; O. Jbara; L. Bazzi; M. Hilali
      Abstract: Natural biopolymer chitosan organic compound (COC) has been used as a copper corrosion inhibitor in molar hydrochloric medium. This study was conducted by weight loss, polarization curves and electrochemical impedance spectroscopy measurements. Scanning electron microscopy, energy dispersive X-ray spectrometry and atomic force microscopy studies were used to characterize the surface of uninhibited and inhibited copper specimens. The study of the temperature effect was carried out to reveal the chemical nature of adsorption. The inhibition efficiency tends to increase by increasing inhibitor concentration to reach a maximum of 87% at 10−1 mg L−1. The values of inhibitor efficiency estimated by different electrochemical and gravimetric methods indicate the performance of copper in HCl medium containing COC. Adsorption of COC was found to follow the Langmuir adsorption isotherm. In order to get a better understanding of the relationship between the inhibition efficiency and molecular structure of COC, quantum chemical and molecular dynamics simulation approaches were performed to get a better understanding of the relationship between the inhibition efficiency and molecular structure of chitosan.
      PubDate: 2017-07-03
      DOI: 10.1007/s10570-017-1381-z
       
 
 
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