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CHEMISTRY (610 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 13)
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: 42)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 20)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 20)
ACS Macro Letters     Full-text available via subscription   (Followers: 25)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 40)
ACS Nano     Full-text available via subscription   (Followers: 266)
ACS Photonics     Full-text available via subscription   (Followers: 13)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 23)
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 Chimica Slovenica     Open Access  
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
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: 54)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 64)
Advances in Chemical Science     Open Access   (Followers: 15)
Advances in Chemistry     Open Access   (Followers: 20)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 21)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 25)
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: 43)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
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: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 61)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 15)
American Journal of Chemistry     Open Access   (Followers: 29)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 15)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 166)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 237)
Annales UMCS, Chemia     Open Access  
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
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: 9)
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: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 8)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 5)
ARKIVOC     Open Access   (Followers: 1)
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  
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 336)
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: 20)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 121)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 84)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 2)
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: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 71)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 9)
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: 17)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 73)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 22)
Chemical Reviews     Full-text available via subscription   (Followers: 182)
Chemical Science     Open Access   (Followers: 23)
Chemical Technology     Open Access   (Followers: 21)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 7)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Hybrid Journal   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 153)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
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: 247)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 19)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 11)
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: 11)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
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: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 5)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
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: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal  
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 70)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
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  

        1 2 3 4 | 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  [2352 journals]
  • Advances in cellulose nanomaterials
    • Authors: Hanieh Kargarzadeh; Marcos Mariano; Deepu Gopakumar; Ishak Ahmad; Sabu Thomas; Alain Dufresne; Jin Huang; Ning Lin
      Abstract: Research on nanocellulose has significantly increased over the past few decades, owing to the various attractive characteristics of this material, such as renewability, widespread availability, low density, excellent mechanical properties, economic value, biocompatibility, and biodegradability. Nanocellulose categorized into two main types, namely cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs). In this review, we present the recent advances made in the production of CNFs and CNCs. In addition to the conventional mechanical and chemical treatments used to prepare CNFs and CNCs, respectively, other promising techniques as well as pretreatment processes have been also proposed in recent times, in an effort to design an economically efficient and eco-friendly production route for nanocellulose. Further, while the hydrophilic nature of nanocellulose limits its use in polymeric matrices and in some industrial applications, the large number of hydroxyl groups on the surface of nanocellulose provides a suitable platform for various kinds of modification treatments. The various chemical and physical surface treatment procedures reported for nanocellulose have been reviewed in this paper. Finally, in this review, we summarize the life cycle assessment studies conducted so far on nanocellulose, which quantify the environmental impact of nanocellulose products. The current paper is a comprehensive review of the recent literature on nanostructured cellulose.
      PubDate: 2018-02-27
      DOI: 10.1007/s10570-018-1723-5
  • Correction to: Carbon/ZnO nanorods composites templated by TEMPO-oxidized
           cellulose and photocatalytic activity for dye degradation
    • Authors: He Xiao; Weibo Zhang; Yicui Wei; Lihui Chen; Liulian Huang; Bruno Boury
      Abstract: In the original publication of the article, the author wishes to add two new authors Liulian Huang and Bruno Boury who have made great contributions to this article. Hence, the author group has been updated in this correction.
      PubDate: 2018-02-26
      DOI: 10.1007/s10570-018-1705-7
  • A simple architecture of cellulose microfiber/reduced graphene oxide
           nanocomposite for the electrochemical determination of nitrobenzene in
           sewage water
    • Authors: Paramasivam Balasubramanian; T. S. T. Balamurugan; Shen-Ming Chen; Tse-Wei Chen; Tien-Wen Tseng; Bih-Show Lou
      Abstract: Biomaterial nano architectures have become an eminent building block in bio-electronics. A green nano composite of reduced graphene oxide (RGO) supported cellulose microfiber (CMF) was used in an electrochemical assay of nitrobenzene (NB). The synthesized composite was characterized via Fourier Transform Infra-Red spectra, Raman spectroscopy, Scanning electron microscopy and EDX spectroscopy. The CMF-RGO film modified glassy carbon electrode showed promising electrocatalytic activity towards NB reduction in terms of high sensitivity (733.8 µA mM−1 cm−2), broad dynamic range (0.2–927.7 µM), and a decent limit of detection (88 nM). On top of this, the composite was used to analyze the water samples collected from river, sewage, and pond aquarium with satisfactory results. In addition, the fabricated sensor matrix offers good durability and appreciable reproducibility. Electrocatalytic performance of the constructed assay was comparable with the reported NB sensors matrices.
      PubDate: 2018-02-26
      DOI: 10.1007/s10570-018-1719-1
  • High-yield production of 5-hydroxymethylfurfural from d -fructose, d
           -glucose, and cellulose by its in situ removal from the reaction system
    • Authors: Kota Enomoto; Takashi Hosoya; Hisashi Miyafuji
      Abstract: 5-Hydroxymethylfurfural (5-HMF) from lignocellulosics has attracted attention as a platform chemical in chemical industry. In 5-HMF production processes, undesired degradation of 5-HMF by acid catalysts generally occurs, by which the 5-HMF yield is decreased along with formation of various types of by-products. In this study, we employed an acidic ionic liquid, 1-methylimidazolium hydrogen sulfate ([HMIM]HSO4), as a reaction medium for 5-HMF production and carried out in situ removal of 5-HMF from the reaction solution by on-line vacuum steam distillation. In our reaction system, 76.1% 5-HMF yield was achieved from d-glucose, which yield was very similar to that from d-fructose (77.3%). Various types of cellulose samples also gave 5-HMF with the yield up to 68.3% regardless of their molecular weights and crystallinities. The 5-HMF produced was recovered as an aqueous solution with substantial purity and almost no contamination with the ionic liquid.
      PubDate: 2018-02-24
      DOI: 10.1007/s10570-018-1717-3
  • Hydrolytic hydrogenation of cellulose to ethylene glycol over carbon
           nanotubes supported Ru–W bimetallic catalysts
    • Authors: Lucília S. Ribeiro; Joana Órfão; José J. de Melo Órfão; M. Fernando R. Pereira
      Abstract: Ru and W mono- and bimetallic catalysts supported on carbon nanotubes were prepared and characterized by different techniques. The prepared catalysts were then tested for the one-pot conversion of cellulose to ethylene glycol. The influence of several factors, such as nature of metal, metal loading, amount of catalyst, catalytic support, hydrogen pressure, reaction temperature and stirring rate, was investigated. When Ru was incorporated into the supported tungsten catalyst a promoting effect was observed, with a great increase in the yield of ethylene glycol, which was explained by the interaction between both metals. The results showed that cellulose could be efficiently converted into ethylene glycol with a yield of 40% after just 3 h of reaction using 0.8%Ru–30%W/CNT as catalyst, at a temperature of 205 °C and H2 pressure of 50 bar. Moreover, the catalyst showed good stability after repeated use, at least up to four cycles, and no tungsten leaching to solution was observed. Graphical
      PubDate: 2018-02-24
      DOI: 10.1007/s10570-018-1721-7
  • Cellulase immobilized on mesoporous biochar synthesized by ionothermal
           carbonization of cellulose
    • Authors: Chang-hui Zhu; Zhen Fang; Tong-chao Su; Xing-kang Li; Qi-ying Liu
      Abstract: Cellulose-based biochar was prepared via ionothermal carbonization of cellulose in [Bmim]Cl with H2SO4and subsequent pyrolysis. The biochar was analyzed by a series of characterization methods, indicating that it was a kind of mesoporous carbon suitable for the adsorption of cellulase. Kinetic analysis showed that the immobilized cellulase exhibited higher affinity to carboxymethyl cellulose than free cellulase. The immobilized cellulase, at different pH and temperatures, was more stable than free cellulase. It was used to hydrolyze pretreated cellulose in [Bmim]Cl with a total reducing sugar (TRS) yield of 99.9%. The immobilized cellulase maintained activity of 74.8% after five cycles at an immobilized cellulase/cellulose weight ratio of 30:1. When the cellulose loading was increased by a factor of 5, the TRS yield decreased by only 27.5%.
      PubDate: 2018-02-24
      DOI: 10.1007/s10570-018-1704-8
  • Correction to: Parenchyma cell wall structure in twining stem of Dioscorea
    • Authors: Jasna Simonović Radosavljević; Jelena Bogdanović Pristov; Aleksandra Lj. Mitrović; Gabor Steinbach; Gregory Mouille; Srđan Tufegdžić; Vuk Maksimović; Dragosav Mutavdžić; Dušica Janošević; Marina Vuković; Győző Garab; Ksenija Radotić
      Abstract: In the original publication of the article, one of the project numbers was omitted in the Acknowledgments. The correct version is provided below.
      PubDate: 2018-02-23
      DOI: 10.1007/s10570-018-1706-6
  • Dye removal from single and binary systems using gel-like bioadsorbent
           based on functional-modified cellulose
    • Authors: Yuanfeng Pan; Xiang Shi; Pingxiong Cai; Tianxiang Guo; Zhangfa Tong; Huining Xiao
      Abstract: A novel type of gel-like bioadsorbent was prepared by crosslinking thiourea-modified sugarcane bagasse cellulose with carboxymethyl cellulose, and used for the removal of methylene blue (MB) and crystal violet (CV) in single and binary systems. The resulting bioadsorbent was characterized with FTIR, XRD, SEM and thermogravimetric analysis. The porous structure of hydrogels significantly improved the adsorption capacity towards dyes. The effects of pH, temperature, initial concentration of dyes and adsorbent dosage on the adsorption behavior were systematically investigated. The maximum adsorption capacity for MB and CV reached as high as 632.9 and 574.7 mg/g in single system; and 555.6 and 427.4 mg/g in binary system, respectively. The kinetic data fitted well to the pseudo-second-order model in both systems; and the dye adsorption on bioadsorbent was mainly governed by intraparticle diffusion. Meanwhile, the isotherm data fitted well to Langmuir models. Moreover, the bioadsorbent showed excellent recycling ability over the desorption tests, thus leading to a promising and green-based adsorbent for the removal of dyes.
      PubDate: 2018-02-23
      DOI: 10.1007/s10570-018-1711-9
  • A novel patterning method for three-dimensional paper-based devices by
           using inkjet-printed water mask
    • Authors: Krirktakul Punpattanakul; Sattawat Kraduangdej; Netchanok Jiranusornkul; Muthita Chiaranairungroj; Alongkorn Pimpin; Tanapat Palaga; Werayut Srituravanich
      Abstract: Paper-based devices are continuing to grow rapidly. However, conventional paper patterning methods are mostly restricted to the fabrication of two-dimensional (2D) patterns. Here, we present a novel patterning method for the fabrication of 2D and 3D paper-based devices. For the first time, a 3D fluidic channel network with multiple crossings of fluidic channels is successfully fabricated on a layer of paper without sophisticated procedures. The proposed method utilizes a commercially available inkjet printer to print water pattern as a protective mask onto both sides of a paper substrate and followed by soaking the sample into a non-polar solution which contains a hydrophobic substance to form hydrophobic barriers on the paper substrate. The printed water mask helps preventing the adsorption of the non-polar solution into the printed water area resulting in the formation of hydrophobic and hydrophilic areas. This opens up a new route towards the development of 2D and 3D paper-based devices using low-cost equipment and a variety of materials.
      PubDate: 2018-02-21
      DOI: 10.1007/s10570-018-1712-8
  • Effect of hemicelluloses on pulp characteristics and use of ceramic
           membranes in the separation of hemicelluloses from highly alkaline
           industrial process stream
    • Authors: Saurabh C. Singh; Rupesh A. Khare; Z. V. P. Murthy
      Abstract: Effect of hemicelluloses on pulp swelling and reactivity characteristics was demonstrated. Pulp swelling, reactivity, porosity, absorption capacity were noted to decrease with increase in hemicelluloses of steeping lye. Performance of ultrafiltration ceramic membranes was studied for the separation of hemicelluloses from a highly alkaline stream of viscose process containing 17–18 wt% sodium hydroxide. Effect of process conditions like pressure and feed concentrations (hemicellulose and caustic) was studied to understand their correlation with hemicelluloses retention and permeate flux. Long-term performance of ceramic and polymeric membranes were also compared. This study indicates no adverse impact on retention of hemicelluloses with the use of ceramic membranes, however, significant increase in permeate flux could be obtained. Ceramic membranes were found to sustain the performance owing to their chemical stability.
      PubDate: 2018-02-21
      DOI: 10.1007/s10570-018-1716-4
  • Nanoporous cellulose membrane doped with silver for continuous catalytic
           decolorization of organic dyes
    • Authors: Yibo Yang; Zhenming Chen; Xiaodong Wu; Xinxing Zhang; Guiping Yuan
      Abstract: Despite the rapid progress in the development of catalysts for dye decolorization, the simultaneous catalyzing and product separation to achieve continuous processing remains a great challenge. Here, silver nanoparticle-doped bacterial cellulose (AgNP@BC) nanoporous membrane with AgNP diameter of ~ 8.1 nm is successfully fabricated without employing any other reductants, capping or dispersing agents. In the procedure, BC hydrogel with 3D network acts as not only a stable scaffold, but also a reductant for the synthesis of AgNPs. The as-prepared membrane exhibits high efficiency of continuous catalytic decolorization toward two typical organic dyes (rhodamine 6G and methyl orange) due to its distinct nanoporous structure. Furthermore, it shows excellent recyclability with a decolorization efficiency of ~ 99% even after ten times of reusing. Our strategy offers a novel, simple and eco-friendly route for the fabrication of nanoporous catalytic membrane and opens up new opportunities for the continuous catalytic decolorization of dyes in scalable application.
      PubDate: 2018-02-21
      DOI: 10.1007/s10570-018-1710-x
  • Investigation of a new application for cellulose nanocrystals: a study of
           the enhanced oil recovery potential by use of a green additive
    • Authors: Silje N. Molnes; Aleksandr Mamonov; Kristofer G. Paso; Skule Strand; Kristin Syverud
      Abstract: Cellulose nanocrystals (CNC) were investigated for use in a potential new application, enhanced oil recovery. Core flooding experiments were performed on outcrop sandstone cores using CNC particles dispersed in low salinity brine (CNC–LS). Core flooding experiments performed on fully water-saturated cores confirm that a majority of viscosity-generating CNC particles successfully traverse the cores at temperature conditions ranging from 60 to 120 °C. Oil recovery tests performed on crude oil saturated sandstone cores at 60 and 90 °C show that when CNC–LS is applied in tertiary mode, ultimate oil recovery increases. During tertiary CNC–LS injection, CNC particles exacerbate differential pressure fluctuations, a phenomenon attributable to log jamming in pore throats, causing remobilisation of oil trapped within pore space regions. Results from the current work indicate that CNC particles dispersed in low saline brine remain promising for implementation in enhanced oil recovery operations.
      PubDate: 2018-02-20
      DOI: 10.1007/s10570-018-1715-5
  • Enhanced wettability and moisture retention of cotton fabrics coated with
           self-suspended chitosan derivative
    • Authors: Xianze Yin; Puxin Weng; Lu Han; Jiacheng Liu; Yeqiang Tan; Dongzhi Chen; Yinshan Zhou; Shi Li; Luoxin Wang; Hua Wang
      Abstract: From the industrial viewpoint, it would be desirable to use neutral aqueous solution when applying chitosan coatings for textile treatment. However, in most cases, chitosan only dissolves in acid solvents. In this work, a self-suspended chitosan derivative with liquid-like behavior was prepared by decorating chitosan with a quaternary ammonium salt followed by ion exchange with nonylphenol polyoxyethylene ether sodium sulfate (NPES). The chitosan derivative with higher NPES content dissolved in neutral aqueous solution, and even exhibited liquid-like viscous behavior without water at room temperature. The morphology, structure, composition, and rheological behavior of the chitosan derivative were systematically characterized using various methods. It was found that incorporation of NPES into the chitosan structure could greatly enhance its dispersion, while the modulus and viscosity of the derivative gradually decreased with increasing temperature. Moreover, the novel chitosan derivative not only directly coated cotton fabric via hydrogen-bonding interaction without removing water but also improved the long-term wettability and moisture retention because of the dual-layer ion structure of the chitosan derivative. The results showed that cotton fabrics coated with such chitosan derivatives could be developed as wound dressing materials in future work.
      PubDate: 2018-02-19
      DOI: 10.1007/s10570-018-1707-5
  • Freeze-drying of oxidized corn starch: electrochemical synthesis and
    • Authors: Xugang Dang; Hui Chen; Yajuan Wang; Zhihua Shan
      Abstract: Oxidized corn starch (OCS) was successfully synthesized by electrochemical oxidation in aqueous solution of sodium chloride, and freeze-drying technology was also used for the post-processing of the prepared OCS. The synthesized OCS solutions were analyzed by viscosity measurement and UV–vis spectroscopies. The OCS samples were characterized by the determination of amylose and amylopectin contents, carboxyl and carbonyl groups contents, FT-IR, XRD, SEM and 13C-NMR. The analyses revealed that the viscosity of OCS solutions decreased with increasing current. The determination and characterization results indicated that the amylopectin decreased gradually, while the carboxyl and carbonyl groups contents of OCS increased by electro-oxidation. The introduction of carboxyl and carbonyl groups promoted OCS hydration and swelling. After electro-oxidation, the crystallinity of the OCS decreased, and the surface formed a loose and porous structure. The electro-oxidation was able to selectively oxidize the hydroxyl groups of the C-2, C-3, and C-6 positions by adjusting the current.
      PubDate: 2018-02-19
      DOI: 10.1007/s10570-018-1701-y
  • Removal of heavy metal and sulfate ions by cellulose derivative-based
    • Authors: Xin Gao; Heng Zhang; Keli Chen; Jiali Zhou; Qixing Liu
      Abstract: A series of environmentally-friendly bagasse pith cellulose-based adsorbents were prepared in an attempt to retain Cu2+ and SO42− from aqueous solutions. The proof of ion adsorption on the biosorbents was identified from Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy-scanning electron microscope. The adsorption capacities were highly dependent on pH and the maximum uptakes of both ions were obtained at pH 5. An increase of solution temperature resulted in decreasing Cu2+ removal but enhancing SO42− adsorption. The kinetic studies showed that the adsorptions of copper and sulfate ions followed the pseudo-second-order kinetics. The analysis of isotherm data indicated that the Langmuir and Freundlich models were in good agreement with the sorptions of Cu2+ and SO42−, respectively. The proportion of carboxylate cellulose and quaternary ammonium-functionalized cellulose in biosorbents influenced on adsorption capacity of the above ions. The adsorption mechanism was mainly governed by ion exchange, complexation and electrostatic association.
      PubDate: 2018-02-19
      DOI: 10.1007/s10570-018-1690-x
  • Statistical modelling and optimization of alkaline peroxide oxidation
           pretreatment process on rice husk cellulosic biomass to enhance enzymatic
           convertibility and fermentation to ethanol
    • Authors: Augustine Omoniyi Ayeni; Michael Olawale Daramola; Patrick T. Sekoai; Opeyemi Adeeyo; Musa Joel Garba; Ayotunde A. Awosusi
      Abstract: The complex and ordered arrangements of the lignocellulosic materials make them recalcitrant for their conversions to ethanol. Pretreatment is a crucial step in overcoming these hindrances. In this study, a 23-full factorial design of experiments optimization technique was applied on the alkaline peroxide oxidation pretreatments of rice husks biomass. The low–high levels of the influencing variables on pretreatments were; temperature (100–120 °C), time (1–2 h), % (v/v)H2O2 concentration (1–3%). Under the prevailing pretreatments, the optimum conditions were predicted and validated to be 109 °C, 2 h, and 1.38% H2O2 which yielded 56% (w/w) cellulose content, 55% (w/w) hemicellulose solubilization, and 48% (w/w) lignin removal. At the established optimum pretreatment conditions, and considering variations in biomass and enzymes loadings, maximum reducing sugars production was 205 mg/g dry biomass at different enzymatic hydrolysis conditions of 3% biomass loading, hydrolysis temperature of 45 °C, hydrolysis time of 24 h, and 35 FPU/g cellulose enzyme loading. The highest cellulose conversion of 33% yielded 24 g/L ethanol at the end of the first day of saccharification and fermentation. Physical, structural, and morphological investigations on raw and treated materials using tools such as stereomicroscopy, scanning electron microscopy, and fourier transform infrared spectroscopy further revealed the effectiveness of chosen method on rice husks biomass.
      PubDate: 2018-02-19
      DOI: 10.1007/s10570-018-1714-6
  • Thermal stress induction for improving the absorption of raw cotton fabric
    • Authors: Sahar Najafabadi; Ramin Khajavi
      Abstract: Chemical processes for improving cotton fabric absorption, such as scouring, are costly and not environmentally friendly. This study introduced a novel and eco-friendly method based on thermal shock for this purpose. Greige cotton fabric samples underwent different thermal shock sequences with dry ice and boiling and cooling water. The samples were characterized using scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, methylene blue number and Brunauer–Emmett–Teller absorption isotherm were used for specific surface area measurement. A constant-rate-of-extension type tensile testing machine was also used to determine the tensile mechanical properties of the fabrics, and the effect of thermal shock on moisture regain, water absorption time, and amount of wax removal were investigated. Finally, nanoparticles of copper (Cu) were synthesized in situ on both the thermally shocked and greige fabric samples, and the absorption and particle size were compared. The thermally shocked samples showed longitudinal micro cracks, their water absorbency time decreased and their moisture regain increased (up to 14%). After treatment, no significant shrinkage or strength loss was detected. Synthesized Cu nanoparticles without the presence of cotton substrate showed a mean size larger than 825 nm, but particle sizes decreased to 297 and 69 nm in the presence of the greige and the DiH8 cotton fabric samples, respectively. The morphology of Cu nano particles altered from octahedral to spherical and was more homogeneously distributed for thermally shocked sample.
      PubDate: 2018-02-17
      DOI: 10.1007/s10570-018-1708-4
  • Investigation of stability of branched structures in softwood cellulose
           using SEC/MALLS/RI/UV and sugar composition analyses
    • Authors: Yuko Ono; Ryunosuke Funahashi; Tsuguyuki Saito; Akira Isogai
      Abstract: Size-exclusion chromatography using multi-angle laser-light scattering, refractive index, and ultraviolet absorption (SEC/MALLS/RI/UV) detection was applied to Japanese cedar (JC) and eucalyptus (E) powders after delignification (D), extraction with 4% NaOH (H), and acid hydrolysis (A), with different sequences of the D, H, and A treatments. All the delignified wood samples were dissolved in 8% (w/w) LiCl/N,N-dimethylacetamide (DMAc) after ethylenediamine pretreatment. The wood sample/LiCl/DMAc solutions were diluted to 1% (w/v) LiCl/DMAc and subjected to SEC/MALLS/RI/UV analysis. The cellulose molecules in the high-molar-mass (HMM) fractions of the eucalyptus samples, i.e., E-D, E-DHA, and E-ADH, were linear polymers with random coil conformations. In contrast, the cellulose molecules in the HMM fractions of the Japanese cedar samples, i.e., JC-D, JC-AD, JC-DHA, and JC-D-α-cellulose (prepared from JC-D by soaking in 17.5% NaOH), had branched structures. However, the JC-ADH HMM fraction contained no branched structures. The results of SEC/MALLS/RI/UV and neutral sugar composition analyses of the Japanese cedar samples showed the presence of chemical linkages between cellulose and glucomannan molecules through lignin or lignin fragments. The stability of the cellulose/glucomannan linkages in the Japanese cedar holocellulose was investigated based on the results for samples prepared using different sequences. The obtained results were consistent with those of SEC/MALLS/RI analysis of softwood acid-sulfite and kraft pulps; softwood kraft pulp has branched structures in the HMM fraction, whereas softwood acid-sulfite pulp has no such branched structures.
      PubDate: 2018-02-17
      DOI: 10.1007/s10570-018-1713-7
  • Mechanical properties of polyamide 11 reinforced with cellulose nanofibres
           from Triodia pungens
    • Authors: Sven Rohner; Jarrad Humphry; Céline M. Chaléat; Luigi-Jules Vandi; Darren J. Martin; Nasim Amiralian; Michael T. Heitzmann
      Abstract: There is a growing demand for the development of new renewable materials and the replacement of fossil fuel based polymers with bio-based polymers and composites. Cellulose nanofibres (CNF) is an emerging nano-reinforcement agent for polymers to improve mechanical properties. The preparation and properties of bionanocomposites consisting of spinifex cellulose nanofibres and bio-based polyamide 11 are reported. The freeze-dried nanofibres derived from a native Australian grass, Triodia pungens (spinifex), and wood were first premixed with the polymer at low concentration (0.1–0.5 wt%) using a jet mill, prior to melt-compounding via extrusion and injection-moulding of test specimens. The thermal and decomposition behaviours, as characterised by TGA and DSC, remained mostly unchanged. DSC and XRD show that crystallinity is largely unaffected by the presence of CNF, and thus all property changes may be attributed solely to the reinforcement effect of the fibres. Product specimens reinforced with CNF produced from spinifex (SCNF), showed an increase in tensile strength (+ 23%), toughness (+ 61%) and impact strength (+ 67%).
      PubDate: 2018-02-16
      DOI: 10.1007/s10570-018-1702-x
  • TiO 2 –SiO 2 Janus particles for photocatalytic self-cleaning of
           cotton fabric
    • Authors: Kamlesh Panwar; Manjeet Jassal; Ashwini K. Agrawal
      Abstract: Titania nanoparticles (TiO2 NPs), when applied directly on textile surfaces for self-cleaning applications, often result in poor wash durability and degradation of the substrate on exposure to UV light. Janus structures having nano-titania deposited on one half of silica (SiO2) particles have been explored to address these issues. The Janus particles could be applied on cotton fabric at neutral pH and exhibited higher photocatalytic activity under neutral conditions unlike TiO2 NPs, which required strongly acidic environment both during application and photocatalysis. The Janus particles attached durably to the fabric through their SiO2 surface with TiO2 layer facing upwards resulting in formation of a SiO2 bridge between the active TiO2 layer and the fabric surface. The improved properties were attributed to the characteristic morphology of Janus particles.
      PubDate: 2018-02-14
      DOI: 10.1007/s10570-018-1698-2
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