Nanomaterials
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2020
·Vol. 10
·期 4
·755
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IF 4.324
Lijie Huang,Hanyu Zhao,Tan Yi,Minghui Qi,Hao Xu,Qi Mo,Chongxing Huang,Shuangfei Wang,Yang Liu
Because of its non-toxic, pollution-free, and low-cost advantages, environmentally-friendly packaging is receiving widespread attention. However, using simple technology to prepare environmentally-friendly packaging with excellent comprehensive performance is a difficult problem faced by the world. This paper reports a very simple and environmentally-friendly method. The hydroxyl groups of cellulose nanofibrils (CNFs) were modified by introducing malic acid and the silane coupling agent KH-550, and the modified CNF were added to cassava starch as a reinforcing agent to prepare film with excellent mechanical, hydrophobic, and barrier properties. In addition, due to the addition of malic acid and a silane coupling agent, the dispersibility and thermal stability of the modified CNFs became significantly better. By adjusting the order of adding the modifiers, the hydrophobicity of the CNFs and thermal stability were increased by 53.5% and 36.9% ± 2.7%, respectively. At the same time, the addition of modified CNFs increased the tensile strength, hydrophobicity, and water vapor transmission coefficient of the starch-based composite films by 1034%, 129.4%, and 35.95%, respectively. This material can be widely used in the packaging of food, cosmetics, pharmaceuticals, and medical consumables.Keywords:cassava residue;cellulose nanofibril;modified;cassava starch;composite film;nanocomposite
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CARBOHYDRATE POLYMERS
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2020
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IF 7.182
Ya Liu,Yipeng Zhang,Tougen Liao,Li Gao,Meng Wang,Xu Xu,Xinxin Yang,He Liu
Boron nitride nanosheets (BNNSs) are desirable materials for thermal management applications owing to their excellent thermal conductivity. Such property also related to the increased thermal transfer efficiency per unit mass, which can be improved by constructing three-dimensional (3D) structures. Cellulose nanofibers (CNFs) are often used to prepare 3D skeletons and stabilize the dispersion of inorganic fillers. Therefore, CNF/BNNS aerogels were prepared to disperse BNNS in a 3D network. CNF/BNNS aerogel exhibited a thermal conductivity of 0.57 W m −1 K −1 , which is an enhancement of 443 % compared to 0.105 W m −1 K −1 of CNF aerogel. The surface temperature changes of the aerogels were confirmed a strong thermal management capacity. The BNNSs also resulted in the compressive strength increased from 0.25 MPa (CNF aerogel) to 0.37 MPa (CNF/BNNS aerogel). This study provides an effective strategy for the preparation of cellulose-based nanocomposite aerogels with excellent thermal management properties and mechanical properties.
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Journal of Materials Chemistry C
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2020
·Vol. 8
·期 24
·8234-8242
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IF 7.059
Ya Cheng,Xiuyan Ren,Lijie Duan,Guanghui Gao
Flexible supercapacitors have attracted increasing attention due to their unique soft and capacitive properties. However, for a conductive polymer-based electrode material, the mechanical properties, conductivity and the interface bonding with the electrolyte are all challenging. Here, polypyrrole (PPy) hydrogel electrodes with high stretchability (over 700%), electrical conductivity (11.07 S m−1) and interfacial bonding properties were prepared by doping carboxymethyl cellulose (CMC). Due to the emulsification effect of CMC, PPy could form hydrophilic CMC/PPy fibers in aqueous solutions. Moreover, during the formation process of the PPy hydrogel, uniformly distributed CMC/PPy particles were obtained in situ, resulting in the unique visible light transmission and ultraviolet shielding characteristics of the PPy hydrogel. As a flexible electrode, the PPy hydrogels were assembled into an all-solid-state supercapacitor, which exhibited a specific capacitance of 126.38 F g−1 and excellent cyclic stability (capacitance retention of 82% after 1000 cycles). This facile method of preparing transparent PPy hydrogels can pave a new way for constructing capacitive electronic skins.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Shumin Zhang,Lin Li,Xuehong Ren,Tung-Shi Huang
Bacterial cellulose (BC) is a natural polymer with remarkable superiority for fabricating biomaterials. In this study, a multiporous bacterial cellulose (MBC) film was modified with N-isopropylacrylamide (NIPAM), and the modified MBC film was imbued with antibacterial properties after chlorination. The dried chlorinated samples showed superb antibacterial efficacy and could inactivate 6.19 log of inoculated S. aureus and 6.29 log of E. coli within 1 min of contact. After releasing active chlorine for 12 h, 3.67 log of S. aureus and 3.97 log of E. coli were inactivated within 30 min of contact. The prepared films displayed high porous and layered structures with a resultant excellent water retention which can be applied as material for wound dressings. In addition, the chlorinated films showed hemostatic ability on wound bleeding and good biocompatibility. The prepared N-halamine functionalized MBC films might have great potential applications as wound dressings.
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PROGRESS IN ORGANIC COATINGS
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2020
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IF 4.469
Qian Gao,Min Lei,Kemeng Zhou,Xinliang Liu,Shuangfei Wang,Huimin Li
The objective of this research was to develop an effective and complete green approach for the production of composite films with enhanced antioxidant and antibacterial properties and oxygen barrier properties. This was accomplished by incorporating chitosan (CS) and polypyrrole (PPy) to microfibrillated by coasting method prepare MFC/CS/PPy film. The contact angle was used to evaluate poor water resistance, which increased from 94.1° to 122°. The contact angle of the composite film was further increased to 122° due to the chemical polymerization of pyrrole produces a layer of PPy nanoparticles on the surface of the MFC/CS composite film. The CS and PPy improved the uniformity of the surface and filled the pores, indicating that the channel has been blocked, resulting in significant reduction in oxygen transmission (32.38 cm 3 (m −2 ·day −1 ). The MFC/CS/PPy film showed bactericidal activity against Escherichia coli (5.43 log CFU mL −1 reduction) The synergistic effect of proton amino (in acidic medium) in CS with the positively charged PPy chain improves the antimicrobial performance of MFC/CS/PPy. The positive charges Ions may attach to the negatively charged bacterial cell wall, thus destroying the cell wall and eventually killing the bacteria. The composite films have good thermal stability. The ability of MFC/CS/PPy composite membrane to inhibit 2,2-diphenyl-1-picrylhydrazyl assay (DPPH) activity increases to 54 %. This property depends on the increased activity of the hydrogen atoms. Considering a series of current properties, MFC/CS/PPy composite film was successfully used in the active packing of fresh cherry tomatoes (10 days), effectively extending shelf life. Therefore, MFC/CS/PPy composite film has the potential to be used as biodegradable packaging materials for fresh fruits.
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EUROPEAN POLYMER JOURNAL
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2019
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IF 3.621
Yuchen Li,Xiaobang Hou,Yuanfeng Pan,Lidong Wang,Huining Xiao
The redox-responsive hydrogel as a carrier has been extensively explored for the application associated with drug delivery and tissue engineering due to its super capacity holding water and unique structure for controllable release. However, similar systems for adsorption and release of dyes have been seldom reported. In this work, a novel redox-responsive hydrogel with the size around 14.9 μm was synthesized towards the adsorption of organic dyes. Carboxymethyl cellulose nanocrystals was activated first; followed by reacting with l -cysteine to generate the amide bonds. The resulting disulfide cross-linked hydrogel can rapidly response to the external oxidizing or reducing stimuli to control the process of adsorption or release of dye, i.e., methylene blue (MB). As an efficient adsorbent, the maximum adsorption capacity of the hydrogel reached 756 mg g −1 at pH 11. The experimental data were also fitted with various kinetic and isotherm models. The results indicated that the pseudo-second-order kinetic and Freundlich isotherm models fitted the MB adsorption data well; whereas the release mechanism was better described by Fickian diffusion. Overall, the redox-responsive hydrogel developed in this work is promising for adsorption and enrichment of organic dyes; and its applications could be further broadened.
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CARBOHYDRATE POLYMERS
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2019
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IF 6.044
Xiaolei Luo,Junyan Shen,Yanan Ma,Lin Liu,Ranju Meng,Juming Yao
Robust and sustainable cellulose composite aerogels were prepared by incorporating MgAl-layered double hydroxide (MgAl-LDH) as green nanofillers and flame retardants. Two series of aerogels combining MgAl-CO 3 LDH (MA-C) and MgAl-H 2 PO 4 LDH (MA-P) were achieved, in which both MA-C and MA-P were uniformly dispersed in cellulose substances. The cellulose composite aerogels with 1.8 wt% of MA-C (denoted as CAC) and MA-P (denoted as CAP) displayed excellent mechanical properties, increased by 2.6 and 2.8 times compared with neat cellulose aerogels (CA), respectively. The peak of heat release rate (PHRR) of CAC and CAP reduced by 41 % and 50 % compared with the neat one, respectively, demonstrating the outstanding flame retardancy. The reduction in smoke production ratio (SPR) was 79 % for CAC and 75 % for CAP, respectively, indicating enhanced smoke suppression performance. Therefore, the high performance flame-retardant cellulose composite aerogels exhibit an application prospect in green advanced engineering field.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Tao Wang,Xiqing Liu,Donglai Han,Yuxuan Sun,Changchang Ma,Yang Liu,Pengwei Huo,Yongsheng Yan
In this work, a biofiber was used as the natural polymer carrier to design a BiVO 4 QDs/cellulose fiber composite for photocatalytic application. The biofiber was obtained from bamboo, which was green, abundant and short growth cycle in Asia. Naturally rich groups of biofiber provided many sites to absorb the Bi 3+ to form the uniform distribution for BiVO 4 QDs . Moreover, a series of results indicated the strong connection was formed between biofiber and BiVO 4 QDs, which could increase the stability and electron transfer . Therefore, the new composite photocatalyst exhibited better stability and effectively photocatalytic activity . Moreover, the possible mechanism of synthesis and photocatalytic were discussed, which provided insight for synthesizing photocatalytic based on biomaterials.
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CARBOHYDRATE POLYMERS
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2019
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IF 6.044
Yan-Yan Xie,Xiao-Hui Hu,Yan-Wen Zhang,Fazli Wahid,Li-Qiang Chu,Shi-Ru Jia,Cheng Zhong
The absence of antibacterial activity of bacterial cellulose (BC) restricts its applications in the biomedical field. To introduce antimicrobial properties into BC, we studied the synthesis, structure, and antimicrobial properties of a novel nanocomposite film comprising BC, graphene oxide (GO), and copper-oxide (CuO) nanosheets. The nanocomposite film was synthesized by incorporating GO-CuO nanohybrids into BC matrix through homogenized blending. The CuO nanosheets, with a length range of 50 nm–200 nm and width range of 20 nm–50 nm, which were uniformly grown on the GO along with even distribution of GO-CuO nanohybrids on the surface of the cellulose fibers. The nanocomposites displayed better antibacterial activity against gram-positive than gram-negative bacteria. BC/GO-CuO nanocomposites showed higher antibacterial activity than BC/CuO. We also elucidated the mechanism of antibacterial activity of the nanocomposites. Further, the nanocomposites exhibited biocompatibility towards mice fibroblast cells. The nanocomposites might serve as an excellent source for development of antibacterial materials.
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ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Qiang-Qiang Zhang,Ying-Jie Zhu,Jin Wu,Li-Ying Dong
A filter paper with a large number of nanopores and channels is vital for highly efficient nanofiltration to significantly increase the water flux without sacrificing the separation efficiency. In this work, we report a new kind of nanofiltration filter paper consisting of a cellulose nanofiber (CNF) barrier layer on the cellulose fiber (CF)/ultralong hydroxyapatite nanowire (HAPNW) substrate. The CF/HAPNW filter paper and CNF/HAPNW filter paper can be prepared by a simple papermaking process including filtration, hot pressing, and drying. The porous network formed by the interweaving of CFs and HAPNWs provides vital channels for rapid water transportation. The experiments indicate that the pure water flux (PWF) of the CF/HAPNW filter paper is as high as 544.4 L m–2 h–1 bar–1, which is about 50 times that of the CNF/HAPNW filter paper. Compared with the nanofiltration filter paper based on the CNF/HAPNW substrate, the PWF of the CNF–CF/HAPNW nanofiltration filter paper can be enhanced by 20% with rejection rates above 95% for four different dyes. Moreover, the CNF–CF/HAPNW nanofiltration filter paper shows a relatively high rejection rate for Na2SO4 (75.7%) and NaCl (65.8%). The high PWF and excellent water filtration performance make the as-prepared CNF–CF/HAPNW nanofiltration filter paper promising for application in water purification.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Sijia Liu,Rongkai Cui,Yibo Ma,Qian Yu,Akash Kannegulla,Bo Wu,Hongtao Fan,Alan X. Wang,Xianming Kong
Flexible plasmonic Surface-enhanced Raman scattering (SERS) substrates were fabricated using cellulose textile fibers, in which the textile fibers were recycled from waste paper in an eco-friendly way. The Glycidyltrimethylammonium chloride (GTAC) with positive charges was grafted onto the surface of the cellulose textile fibers through cationization. Plasmonic silver nanoparticles (Ag NPs) with negative charges were decorated onto the cellulose textile fibers via electrostatic interactions . After cationization, the variation range of the diameter of the cellulose textile fibers was significantly increased because part of the cellulose was dissolved under alkaline condition, leading to more ‘hot spots’ for SERS during the shrinking process. The cellulose textile fiber-Ag NPs nanocomposite was employed for monitoring bisphenol A (BPA) in water and soft drink by SERS and the sensitivity of BPA detection achieved 50 ppb. The recovery values of BPA in soda water samples were from 96% to 105%. These results illustrate that the cellulose textile fiber-Ag NPs nanocomposite can be used as flexible, high sensitivity SERS substrates for detecting harmful ingredients in food or environment.
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ENERGY & FUELS
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2019
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IF 3.021
Mengxiang Gan,Guoqing Yang,Zhihan Wang,Xiaofeng Sui,Yu Hou
Oxidative desulfurization (ODS) is a promising method to remove the heterocyclic sulfur compounds from fuel and such process need high-performance catalysts. Polyoxometalates (POMs) have been proven to be excellent catalysts in the ODS reaction, which need to be immobilized on carriers to realize its industrial application. In this work, [β-SiMo3W9O40]n− has been loaded on a sustainable cellulose nanofiber (CNF)-based material, which was then calcined at 400 °C to form an POM-based composite material. CNF was modified by γ-(2,3-epoxypropoxy)propyltrimethoxysilane (GPTMS) and polyethyleneimine (PEI) so that the polyanions and protonated PEI could effectively interact with each other; therefore, POM could be well supported on the carrier. The catalytic results showed that in model oil with the sulfur concentration being 2000 ppm, the removal efficiency of dibenzothiophene, benzothiophene, and 4,6-dimethyldibenzothiophene were 99, 89, and 100%, respectively. In addition, infrared spectra analysis indicated the stability of the catalyst after it was recycled. This work provides a new method to obtain effective heterogeneous ODS catalysts by employing an eco-friendly CNF as raw materials.
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