Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (661 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: 30)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 8)
ACS Catalysis     Hybrid Journal   (Followers: 52)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 23)
ACS Combinatorial Science     Hybrid Journal   (Followers: 21)
ACS Environmental Au     Open Access   (Followers: 9)
ACS Macro Letters     Hybrid Journal   (Followers: 25)
ACS Materials Letters     Open Access   (Followers: 2)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 42)
ACS Nano     Hybrid Journal   (Followers: 183)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 30)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 8)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 7)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 71)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 3)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 6)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 109)
Advances in Chemical Science     Open Access   (Followers: 51)
Advances in Chemistry     Open Access   (Followers: 34)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 33)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 51)
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 Sample Preparation     Open Access   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 16)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Chemical Education     Open Access   (Followers: 5)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 1)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 4)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 43)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 19)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 153)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 231)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
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)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 24)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access  
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 202)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 23)
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: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 90)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 66)
Bioorganic Chemistry     Hybrid Journal   (Followers: 9)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
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: 24)
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: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 12)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Carbohydrate Research     Hybrid Journal   (Followers: 24)
Carbon     Hybrid Journal   (Followers: 65)
Carbon Capture Science & Technology     Open Access  
Carbon Trends     Open Access   (Followers: 4)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 11)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal  
Chem Catalysis     Hybrid Journal  
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 81)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Physics Impact     Full-text available via subscription  
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 170)
Chemical Science     Open Access   (Followers: 39)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 2)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 54)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 22)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 123)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 19)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 6)
Chemistry Education Review     Open Access   (Followers: 1)
Chemistry in Education     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 163)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
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: 9)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 8)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comptes Rendus : Chimie     Open Access  
Comptes Rendus : Physique     Open Access   (Followers: 2)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Cellulose
Journal Prestige (SJR): 1.047
Citation Impact (citeScore): 4
Number of Followers: 7  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1572-882X - ISSN (Online) 0969-0239
Published by Springer-Verlag Homepage  [2469 journals]
  • Eco-friendly chitosan@silver/plant fiber membranes for masks with thermal
           comfortability and self-sterilization

    • Free pre-print version: Loading...

      Abstract: The surgical masks have been essential consumables for public in the COVID-19 pandemic. However, long-time wearing masks will make wearers feel uncomfortable and massive discarded non-biodegradable masks lead to a heavy burden on our environment. In this paper, we adopt degradable chitosan@silver (CS@Ag) core–shell fibers and plant fibers to prepare an eco-friendly mask with excellent thermal comfort, self-sterilization, and antiviral effects. The thermal network of CS@Ag core–shell fibers highly improves the in-plane thermal conductivity of masks, which is 4.45 times higher than that of commercial masks. Because of the electrical conductivity of Ag, the fabricated mask can be electrically heated to warm the wearer in a cold environment and disinfect COVID-19 facilely at room temperature. Meanwhile, the in-situ reduced silver nanoparticles (AgNPs) endow the mask with superior antibacterial properties. Therefore, this mask shows a great potential to address the urgent need for a thermally comfortable, antibacterial, antiviral, and eco-friendly mask. Graphical abstract
      PubDate: 2022-05-21
       
  • Hydroxyethyl cellulose-based electrically conductive, mechanically
           resistant, strain-sensitive self-healing hydrogels

    • Free pre-print version: Loading...

      Abstract: Abstract Self-healing hydrogels that mimic human skin and have numerous senses of external tension and temperature are a current topic in science. However, getting skin-compatible performance out of them is still a challenge, which limits their use as skin-like devices. In the current work, various concentrations of hydroxyethyl cellulose (HEC) and iron (III) were used to adjust the mechanical strength, self-healing, and electrically conductive efficiency of the hydrogel sensor at room temperature. The designed hydrogel exhibited robust mechanical strength with a fracture stress of 0.51 MPa, a fracturing strain of 1250%. The hydrogel also showed self-healing efficiency in stress (97%), strain (99%), and toughness (94%) in a 24 h healing time at room temperature without any external intervention. The hydrogel showed about 2.22 × 10–1 S m−1 electrical conductivity at room temperature. In the holding-loading stepwise test, the hydrogel displayed stair-like trends and maintained a specific strain for a long time without any change in the ΔR/R0 %, indicating outstanding resistance stability as a function of distinct stains.
      PubDate: 2022-05-20
       
  • Multifunctional waterproof MXene-coated wood with high electromagnetic
           shielding performance

    • Free pre-print version: Loading...

      Abstract: Increasing electromagnetic pollution calls for electromagnetic interference (EMI) shielding materials, especially sustainable, lightweight, and environmentally stable, biomass-based materials. MXene-coated wood (M/wood) is prepared by simply spraying MXene sheets on the wood surface. Varying this spray coating manipulates the shielding performance and its application to different wood species. The M/wood exhibits high electrical conductivity (sheet resistance is only 0.65 Ω/sq) with an excellent EMI shielding effectiveness of 31.1 dB at 8.2 ~ 12.4 GHz and is also fire retardant. Furthermore, waterborne acrylic resin (WA) is coated on M/wood to enhance environmental stability. The WA coating improves EMI shielding performance stability after water-soaking and drying testing and prevents the peeling of MXene from wood. These satisfactory properties of WA-M/wood and the facile manufacturing approach promote the feasibility of wood-based EMI shielding materials. Graphical abstract
      PubDate: 2022-05-18
       
  • Synthesis of 2-methylacrylamide/high-molecular-weight cellulose using
           gamma ray irradiation and preparation of cryogels for removing anionic
           dyes

    • Free pre-print version: Loading...

      Abstract: We report a new method for treating high-molecular-weight cellulose with 60Co gamma rays to simultaneously graft functional groups onto the natural polymer and promote its solubility. After exposing cellulose to a 40-kilogray dose of gamma rays in the presence of 2-methylacrylamide, numerous amide groups were grafted onto the cellulose chain and its solubility increased. Amide-functionalized cryogels were prepared via the sol–gel method using the irradiated product as a raw material. Compared with 40-kGy-irradiated high-molecular-weight-cellulose cryogel, the amide-functionalized cryogels had relatively high zero-point charge pH values and excellent adsorption capacities with regard to anionic dyes over the pH range 2–10. They were also stable in terms of reusability. Therefore, the 2-methylacrylamide/high-molecular-weight cellulose cryogel has great potential for use in the treatment of colored surface wastewater. The 60Co gamma ray irradiation technique described herein is a stable and highly efficient method for the preparation of functionalized cellulose products. Graphical abstract
      PubDate: 2022-05-17
       
  • Polysaccharides, as biological macromolecule-based scaffolding systems in
           heart valve tissue engineering: a review

    • Free pre-print version: Loading...

      Abstract: Valvular heart disease is a major clinical challenge with significant morbidity and mortality rate. Generally, valve repair is advantageous over replacement, however most of these valves are impossible to repair. Donor shortage has resulted in long waiting lists, and the need for heart valve replacement is estimated to triple in the coming years. In addition, the use of mechanical and bioprosthetic heart valves is associated with several challenges such as thrombogenicity, short durability, and the need for repeated surgeries for valve replacement. Heart valve tissue engineering (HVTE) has recently offered new solutions to address these shortcomings. In this endeavour, material selection and optimization are of vital importance. Among different scaffolding biomaterials, the appeal of polysaccharides in HVTE is on the rise. Due to their excellent biocompatibility, tailorable properties, low cost, and availability, these biomaterials have been widely explored as scaffolding systems for HVTE. The current review will discuss applications, challenges, and future perspectives of these biomaterials in HVTE. Graphical abstract
      PubDate: 2022-05-17
       
  • The self-assembly of dialdehyde-cellulose-nanofiber-based hydrogels with
           high compression resilience

    • Free pre-print version: Loading...

      Abstract: Cellulose-nanofiber-based hydrogels (CNF-Gel) exhibit excellent mechanical properties and designable functions. However, it is difficult to coordinate the complex self-assembly structure and various functions, which limits the widespread use of CNF-Gel. Here, a simple and environmental-friendly approach for the preparation of three-dimensional dialdehyde-cellulose-nanofiber-based hydrogels (DAC-Gel) was developed via periodate oxidation of cellulose-nanofiber and freeze drying. The self-assembled DAC-Gel with flexible skeleton structure and numerous aldehyde groups was synthesized without organic solvents or cross-linking agents added. After 100 compression-releasing cycles at a maximum compressive strain of 30%, DAC-Gel-1.5 remained high stress remaining and low energy loss coefficient, demonstrating durable compressive property. As the functional intermediate, DAC-Gel can be further modified to conveniently prepare functional products, which shows a variety of potential applications such as in the carbon capture and storage. After amination with polyethylenimine via Schiff base reaction, the DAC-based CO2 adsorbent DAC-1.5@PEI still remained good elasticity. The introduction of PEI endowed DAC-1.5@PEI with high nitrogen content (18.57 wt%) and CO2 adsorption capacity (2.63 mmol/g) under humid condition. This research develops a synthesis method of flexible and three-dimensional cellulose-based materials from another perspective, and provides useful information for understanding the synthesis process of DAC-Gel in different sizes. Graphical abstract
      PubDate: 2022-05-17
       
  • Multifunctional natural fibers: the potential of core shell MgO–SiO2
           nanoparticles

    • Free pre-print version: Loading...

      Abstract: Abstract Core–shell nanoparticles (NPs) based on metal oxides, namely magnesium oxide (MgO) and silica (SiO2), are a fantastic alternative for natural fibers’ functionalization. In this work, flax fibers were functionalized with MgO and MgO–SiO2 core–shell NPs to achieve multifunctionality. The flax fabrics were functionalized with both NPs by a simple in-situ method. Parallelly, the synthesis of the isolated NPs was performed for comparison purposes. The developed samples were characterized, confirming the successful synthesis of the core–shell NPs and their incorporation onto the fabrics. The wash durability tests confirmed the beneficial effect of the SiO2 shell on the NPs’ anchorage. Ultraviolet (UV) protection capability (UV protection factor (UPF) of 50 +) and hydrophobicity (water contact angle (WCA) of 123.0°) were achieved, together with antibacterial activity and the degradation of methylene blue (MB) capability. Overall, this work presents an innovative method for the synthesis of MgO–SiO2 core–shell NPs and their incorporation onto flax fabrics.
      PubDate: 2022-05-17
       
  • Inherent characteristics of the hygroscopicity of fiber and parenchyma of
           bamboo

    • Free pre-print version: Loading...

      Abstract: Abstract To better understand the hygroscopic behavior of bamboo, at the cellular scale, the hygroscopicity of fibers and parenchyma cells was investigated using Dynamic vapor sorption, and the hygroscopic process was analyzed using mathematical models and dynamic data testing. In addition, the subcellular scale physical properties of bamboo were also studied, and the relationship between cellular physical properties and bamboo hygroscopicity was analyzed. The results demonstrated that the size of the microfibril aggregates at the transverse end of the fiber cells was uniform, the average elastic modulus of the cell wall was 22.47 ± 1.86 GPa, and the distribution of mechanical values was stable. There were differences in the aggregate size of the parenchyma cell wall layer, and the average elastic modulus of the cell wall was 17.28 ± 1.23 GPa. The hygroscopicity of fiber is lower than that of parenchyma cells. When relative humidity (RH) was 90%, the moisture content of parenchyma cells was 16.12%, which was 1.87% higher than that of fiber cells. The multi-layer moisture contents of the fiber and parenchyma cells calculated by the model were 10.91 and 12.25% when RH was 90%. In addition, dynamic adsorption showed that the parenchyma cells had a shorter sorption equilibrium time than fiber cells.
      PubDate: 2022-05-16
       
  • Toughen and strengthen alginate fiber by incorporation of polyethylene
           glycol grafted cellulose nanocrystals

    • Free pre-print version: Loading...

      Abstract: Excellent strength regenerated alginate composite fibers mixed with Poly (ethylene glycol) grafted cellulose nanocrystals (CNC-g-PEG) were prepared through a simple and scalable blending strategy. Firstly, high modulus cellulose nanocrystals (CNCs) were fabricated based on waste cotton fabrics by the chemical treatment. Poly (ethylene glycol) (PEG) with different molecular weight was grafted onto the CNC surface. The composite fibers were prepared from CNC-g-PEG/sodium alginate spinning dope by wet spinning. The CNC-g-PEG/Alginate fibers were characterized using FTIR, XRD, scanning electron microscopy, and mechanical testing. The morphology of the SEM image showed that CNC-g-PEG partially eliminated the defects of the alginate matrix and increased the roughness of the fracture cross-section, constructing material with a denser microstructure. Under the same load, the addition of CNC-g-PEG has better effects on the mechanical properties of alginate fibers than CNCs. The maximum strength and elongation at the break for alginate composite fibers were increased by 56.3% and 81.6% as a result of the CNC-g-PEG reinforcement, respectively. Besides, the salt tolerance and antibacterial activity of the CNC-g-PEG/Alginate composite fibers were improved as the molecular weight of PEG increased. This study provides the possibility for the development of high-performance, green alginate fibers. Graphical abstract
      PubDate: 2022-05-16
       
  • Cellulose acetate nanofibrous wound dressings loaded with 1% probucol
           alleviate oxidative stress and promote diabetic wound healing: an in vitro
           and in vivo study

    • Free pre-print version: Loading...

      Abstract: Abstract Inspired by the antioxidative properties of probucol (Pro), a probucol-loaded electrospun wound dressing was developed to promote diabetic wound healing. Scaffolds were fabricated via electrospinning of cellulose acetate solution containing 1% w/w, 3% w/w, and 5% w/w of probucol. The physicochemical and biological properties of the prepared wound dressings were investigated. Cell viability assay showed that the scaffolds loaded with 1% drug had the most favourable effect on fibroblast cells; therefore, this formulation was chosen for treating diabetic wounds. Furthermore, the healing activity of probucol-loaded wound dressings was investigated in a rat model of the diabetic excisional injury. In vivo study showed that the dressings loaded with 1% probucol had the highest rate of wound healing compared with drug-free dressings and the negative control group. At the end of the 14th day, the cellulose acetate/1% probucol group showed 91.18 ± 4.05% of wound closure and 45.02 ± 2.49 µm of epithelial thickness. In contrast, the cellulose acetate-only group showed 62.21 ± 4.32% of wound closure and 27.22 ± 4.48 µm of epithelial thickness at the same time point. In addition, gene expression analysis showed that the probucol-loaded wound dressings could significantly reduce the tissue expression level of the glutathione peroxidase gene. However, the tissue expression level of the NFK-β gene almost remained unchanged after treatment with cellulose acetate/1% probucol wound dressing.
      PubDate: 2022-05-16
       
  • Tailoring the properties of nanocellulose-sepiolite hybrid nanopapers by
           varying the nanocellulose type and clay content

    • Free pre-print version: Loading...

      Abstract: The development of nanocellulose-clay materials resulted of great relevance, as it opened up the applications of nanocellulose, but it still requires new approaches that could contribute to improve the preparation procedures and the features of this type of biohybrid materials. In this context, nanocellulose-sepiolite (NC-S) biocomposite foams and films have already been successfully tested for some applications. However, the influence of the nanocellulose properties on sepiolite-cellulose interactions, and consequently on the final properties and potential applications of NC-S biohybrid materials, has not been previously studied. To address this knowledge gap, four kinds of nanocelluloses produced from elm biomass (non-chemically pretreated lignocellulose and bleached cellulose nanofibers (LCNFs and CNFs, respectively), TEMPO-oxidized cellulose nanofibers (TOCNFs) and cellulose nanocrystals (CNCs)) were characterized and used to develop NC-S nanopapers. A stronger interaction was found between sepiolite and negatively charged nanocelluloses (TOCNFs and CNCs), improving their thermal stability and mechanical properties by increasing the sepiolite content. Furthermore, the type of nanocellulose and the sepiolite content could be adjusted to tune the flammability, water permeability and mechanical and optical properties of the NC-S nanopapers. Graphical abstract
      PubDate: 2022-05-16
       
  • Recyclable grease-proof cellulose nanocomposites with enhanced water
           resistance for food serving applications

    • Free pre-print version: Loading...

      Abstract: Recyclable cellulose nanofibril (CNF) and lignin-containing cellulose nanofibril (LCNF) coated wood flour composites were fabricated using a vacuum-filtration process for food serving applications. The coated cellulose nanofibril composites had excellent mechanical, and oil, and grease barrier properties compared to a commercial container. However, the composites with both LCNF and CNF coating layers had poor performance in wet conditions compared to the commercial container. The addition of 1 wt.% aluminum sulfate (alum) to the CNF and LCNF coating layer significantly improved the water-resistance of the composites. CNF + 1% alum coated composites had inferior water resistance and lower mechanical strength in wet conditions compared to the commercial container. However, the LCNF + 1% alum coated composites had comparable water resistance and higher wet mechanical properties than the commercial container. The recyclability of the composites was assessed through the disintegration of the samples in water and subsequent reformation, and it was found that the composites were fully recyclable. The composites could fully retain their mechanical and excellent oil and grease barrier properties after each recycling level. These recyclable fully bio-based nanocomposites can be an eco-friendly alternative for currently used food container systems that use harmful chemicals. Graphical abstract
      PubDate: 2022-05-16
       
  • Structures, molar mass distributions, and morphologies of TEMPO-oxidized
           bacterial cellulose fibrils

    • Free pre-print version: Loading...

      Abstract: 2,2,6,6-Tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation has been applied to bacterial cellulose (BC). The TEMPO-oxidized BC (TO-BC) gel particles were subjected to ultrasonication in water to prepare mechanically fibrillated TO-BC (TO-BC-U) samples. The carboxy contents of the TO-BC samples were 1.5‒1.6 mmol/g. X-ray diffraction patterns and solid-state 13C-nuclear magnetic resonance (NMR) spectra of the BC, TO-BC, and TO-BC-U samples showed that cellulose Iα was the dominant crystalline structure. The crystallinities of the samples calculated from the carbon signal areas in the NMR spectra were approximately the same between the BC and TO-BC samples, showing that TEMPO-mediated oxidation selectively occurred on the crystalline BC fibril surfaces. However, the crystallinities of the TO-BC-U samples were lower than those of the BC and TO-BC samples, indicating that ultrasonication of the TO-BC samples in water caused partial decreases in crystallinity. The TO-BC-U samples contained both single fibrils and fibril bundles; completely individualized TO-BC-U fibrils with homogeneous widths was not obtained. The average widths of the single TO-BC-U fibrils were ~ 3 nm, which are close to those of TO-cellulose nanofibrils prepared from wood-cellulose samples. Thus, the crystalline BC fibrils with widths of ~ 3 nm were the smallest crystalline elements. The lengths of the TO-BC samples were greater than 2‒3 µm, whereas the weight-average cellulose chain lengths of the cellulose/TEMPO-oxidized cellulose molecules in TO-BC-U samples were < 800 nm. Hence, each TO-BC-U fibril consisted of multiple cellulose and oxidized cellulose molecules, which were packed along the longitudinal direction. Graphical abstract
      PubDate: 2022-05-15
       
  • Effect of a trace amount of deep eutectic solvents on the structure and
           optical properties of cellulose nanocrystal films

    • Free pre-print version: Loading...

      Abstract: Cellulose nanocrystal (CNC) suspensions can form chiral spiral structures because of their unique self-assembly characteristics, and their structures can be maintained in dried films. This makes CNC films possess iridescent and liquid crystal properties at the same time. However, neat CNC films are so fragile that they are not suitable for wide use. We first explored the influence of a new type of green plasticizer-deep eutectic solvent (formed by urea and choline chloride) on CNC composite films under different molar ratios and proportions. Deep eutectic solvents (DES) have attracted extensive attention in recent years due to their low cost, easy fabrication and no need for purification. Urea/choline chloride, as the original DES, can improve the apparent uniformity and smoothness of the film only by adding 1‱ of DES, maintaining the optical properties and structural stability of the CNC composite film while effectively reducing the brittleness of the film (the molar ratio of the CNC/DES film with the best performance is 2:1). When the amount of DES in the CNC aqueous suspension reaches 10‱, it will destroy the structure of the CNC, resulting in loss of the optical properties of the CNC/DES films. Different from the common small molecule plasticizers previously reported, the addition of DES not only increases the number of hydrogen bonds but also introduces charge force, which forms a network structure that synergistically improves the flexibility of CNC films. Graphical abstract
      PubDate: 2022-05-14
       
  • An interpenetrating-network-like structure in cellulose
           nanocrystal/polyurethane composites and the relative strengthening
           mechanism

    • Free pre-print version: Loading...

      Abstract: Abstract In this work, cellulose nanocrystals (CNCs)/polyurethane (PU) composites (CPCs) were prepared, whose microstructures and properties were studied. Interestingly, most of the CNCs dispersed in the CPCs have gathered together to form many sea-urchin-like clusters and others to form nanotows (series structures of some CNCs). A three-dimensional CNC network has been constructed by linking every two adjacent CNC clusters with CNC nanotows. The interpenetration of the PU network and CNC network has further brought about the formation of an interpenetrating-polymer-network-like (IPNL) structure in CPCs. Moreover, there are some stronger bridging actions between the two networks such as hydrogen bonds, acid-base ion pairs and induced crystallization of CNCs on the polycaprolactone (PCL) segments of PU. The mechanical properties and shape memory ones of CPCs can be significantly improved by the IPNL structure and bridging actions. More importantly, the comprehensive performance of CPCs strongly depends on the integrality level of the CNC network. The CPC3 containing 1.0 wt% CNCs has the highest integrality level of the CNC network, whose tensile strength, extensibility, modulus, and shape fixation ratio are the best among all CPCs, especially the tensile strength that shows an increase of 186% compared with the PU. Furthermore, a composite reinforcement structure composed of high-strength microfibers and “fishing net” structures is formed during the damage process, which can prevent the crack from growing. Although the crystallinity of the PU matrix decreases after the incorporation of CNCs, the grain refinement of PCL segments due to the constraint of the IPNL structure and the induced crystallization of CNCs help the performance improvement of CPCs.
      PubDate: 2022-05-14
       
  • A review on alternative raw materials for sustainable production: novel
           plant fibers

    • Free pre-print version: Loading...

      Abstract: Abstract With ever increasing environmental awareness, renewable raw materials for textile and composite industry have become an important alternative to reduce the use of petroleum-based non-biodegradable fibers in various applications such as marine, automotive, sports and aerospace. Therefore, it is highly critical to understand the chemistry, structure, and properties of novel plant fibers. Natural fibers have been used for various purposes since ancient times. Numerous research and review papers were published on harvesting, production, properties and potential applications of conventional natural fibers. Sustainability, renewability, and recyclability issues increased the use of novel natural fibers globally. New applications such as natural fiber reinforced biodegradable composites also increased the importance of investigations on new natural fibers. This review paper considers extraction methods, fiber structure, chemical, physical and mechanical properties of novel cellulosic fibers. Fiber chemical constituents, functional groups, and surface hydrophilicity were discussed in terms of chemical properties. Physical properties of the cellulosic fibers such as density, crystallinity, maximum thermal degradation, mechanical performance and surface morphology were also discussed. Additionally, mechanical performance of new plant fibers was performed by comparing between some properties of common and recently characterized cellulosic fibers. The brief information about life-cycle assessment, sustainability, recycling, and biocomposite application of the novel plant fibers is also presented. According to the best our knowledge on literature review, this review may be unique to provide detailed information about recently characterized cellulosic fibers. This survey will be helpful to researchers who have interest in novel ligno-cellulosic fibers and fiber reinforced composites.
      PubDate: 2022-05-12
       
  • Pretreatment of lignocellulosic feedstocks for cellulose nanofibril
           production

    • Free pre-print version: Loading...

      Abstract: Abstract Cellulose nanofibrils (CNFs) have attracted a great deal of research interest in recent years attributable to the low cost and abundance of lignocellulosic biomass from which they can be extracted. These materials have potential applications in a wide array of areas because of their unique properties such as ultra-high aspect ratios and specific strengths. However, the high energy required to extract CNFs from biomass through fibrillation often makes them prohibitively expensive or negates their inherent sustainability. As such, a variety of biomass treatments prior to fibrillation have been investigated by researchers to reduce the energy requirements of CNF extraction, improve the efficacy of biomass fibrillation and subsequent processes, and/or impart functionality in resulting nanofibrils. In this review, both widely used and emerging mechanical, chemical, and enzymatic pretreatments used prior to fibrillation of lignocellulosic biomass for CNF extraction are reviewed. Attention is given to the effect of these various pretreatments on the properties of the resulting CNFs. Finally, the energy consumption in fibrillation processes with and without the use of pretreatments is compared, and future perspectives on challenges and opportunities in lignocellulosic feedstock pretreatments are discussed.
      PubDate: 2022-05-11
       
  • Novel bacterial cellulose-TiO2 stabilized Pickering emulsion for
           photocatalytic degradation

    • Free pre-print version: Loading...

      Abstract: Abstract Photocatalytic degradation of organic pollutants is an effective, energy-saving and renewable technique. In this study, functional oil/water (O/W) Pickering emulsions with excellent photocatalytic activity were prepared by the adsorption of nano-titanium oxide (TiO2) into bacterial cellulose (BC). The results indicate that the novel hybrid structure enhanced the interfacial diffusion rate of BC-TiO2 and further improved the mechanical strength of the obtained interfacial layer. Stable medium internal phase emulsions (MIPEs) and high internal phase emulsions (HIPEs) were also obtained by using low-loading hybrid particles. The investigation of morphology and rheological properties indicated that the shear-thinning and solid-like behaviors of the obtained emulsion systems. The photocatalytic degradation of rhodamine B was much faster in the emulsion system than p-TiO2 suspension, which was stabilized by BC-TiO2 (45 min, 90%) with respect to the case of TiO2 (90 min, 90%) and an aqueous system containing TiO2 (120 min, 53%). Therefore, this paper gives new insights to the application of BC as an efficient scaffold for loading TiO2 coupling at the oil–water interface, thus paving the way for the development of sustainable catalyst.
      PubDate: 2022-05-11
       
  • CNFs from softwood pulp fibers containing hemicellulose and lignin

    • Free pre-print version: Loading...

      Abstract: Abstract The energy demand to produce cellulose nanofibrils, CNFs, is high and additionally the cost of the starting material, the pulp, is substantial as high purity cellulose dissolving pulp is generally used. Pulps aimed for board and paper are produced at higher yield as they contain hemicelluloses and, in the case of unbleached pulp, lignin, and would be a more economical starting material for CNFs. It is of interest to understand how the presence of hemicellulose and lignin affects the fibrillation process and CNF properties. Kraft cooks of softwood were performed as well as kraft cooks with addition of polysulfide to increase the hemicellulose content. Part of the pulps were bleached to remove residual lignin, thus making it possible to compare pulps with and without lignin. Higher amount of hemicellulose had an obstructive effect on the enzymatic pre-treatment whereas lignin had no adverse effect on enzyme accessibility. Increased amount of charged groups improved the accessibility for enzymes. Both hemicellulose and lignin were carboxymethylated when pre-treatment by carboxymethylation was employed. However, carboxymethylation partly dissolved hemicelluloses. The tensile strength of CNF films was independent of the chemical composition of the pulp and the pre-treatment strategy. However, since the enzymatic pre-treatment decreased the cellulose DP more, CNF films from enzymatically pre-treated pulps had generally lower tensile strength.
      PubDate: 2022-05-10
       
  • An effect of carboxymethyl starch addition on adhesion to paper of
           water-soluble pressure-sensitive adhesive

    • Free pre-print version: Loading...

      Abstract: Abstract A novel pressure-sensitive adhesive containing carboxymethyl starch (CMS) with various degrees of substitution, has been developed for the paper industry. Obtained adhesives were transferred onto water-dispersible paper carrier giving repulpable double-sided splicing tape. The effect of carboxymethyl starch degree of substitution (DS) on essential adhesive properties: tack, peel adhesion, as well as shear strength for steel and various papers have been tested. Additionally, the solubility in water and alkaline medium has been evaluated. The highest tack and peel adhesion increase was reported for PSA containing CMS with degree of substitution DS 0.86, to fax paper. Moreover, the dynamic shear strength test, imitating the shear conditions in paper processing revealed, that the highest values of this parameter exhibited the system with 15 wt% CMS DS 0.86. For this system, the shortest water-dissolving times as well as at elevated pH were noted: 314 s and 60 s, respectively. The best performance exhibited the adhesive prepared from the mixture of acrylic monomers (35 wt% 2-ethylhyexyl acrylate, 30 wt% butyl acrylate and 35 wt% acrylic acid), 0.4 wt% aluminum acetyl acetonate (crosslinking agent), 50 wt% poly(ethylene glycol) as plasticizer, and 15 wt% CMS with DS 0.86 (basing on acrylic polymer content).
      PubDate: 2022-05-10
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 3.235.176.80
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-