JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·4388-4399
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IF 2.779
Li Ang,Cui Ce,Wang Weijie,Zhang Yue,Zhai Jianyu,Guo Ronghui,Cheng Cheng,Qin Wenfeng,Ren Erhui,Xiao Hongyan,Zhou Mi,Zhang Jinwei
Biomass-derived 3D and porous conductive aerogels have been considered as potential environmentally friendly material for wearable pressure sensors. However, the development of a simple strategy for the fabrication of biomass-derived aerogels with the properties of wide-sensing range, high sensitivity, and low detection is still significantly challenging. Here, graphene was incorporated into waste paper to prepare graphene-coated waste paper aerogel (GWA) using a simple “filtration-oven drying” method under atmospheric pressure. The GWA was further annealed to obtain carbonized graphene-coated waste paper aerogel (C-GWA) for low density and excellent resilience. The C-GWA shows 3D porous structure formed by interpenetrated fibers and low density (25 mg/cm 3 ). The pressure sensor based on C-GWA exhibits wide detection working range (0–132 kPa), ultra-low detection limit (2.5 Pa), and high sensitivity of (31.6 kPa −1 ). In addition, the pressure sensor can be used to detect human motions including the pulse of the human body, cheek blowing, and bending of human joints. The result indicates that the C-GWA-based sensor shows great potential for wearable electronic products.
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 79
·期 12
·10573-10593
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IF 2.843
Zhong Wen,Wei Binxiao,Wang Yu,Bai Yongping
Polyacrylate coating has been used for modifying Polyethylene terephthalate (PET) film to improve its oxygen barrier performance. However, comprehensive study on the oxygen barrier of polyacrylate coating is still underway. In this work, a series of polyacrylate coatings with different functional monomers such as maleic acid (MA), acrylic acid (AA), 2-hydroxyethyl acrylate (2-HEA), and 2-butene-1, 4-diol (1, 4-BED) were prepared by using Desmodur L75 (L75) and Erisys Ga240 (Ga240) as a curing agent. The polyacrylate coatings were characterized by Fourier Transform Infrared (FT-IR) spectrometer. The oxygen permeability (Po 2 ) of the coatings was measured by Gas Permeability Tester. The results reveal that anhydride moiety produced by dehydration of carboxylic acid is the key structure for enhancing the oxygen barrier property of the polyacrylate coating. Moreover, when the anhydride coexists with other cross-linking structures, the oxygen barrier performance of the resulting coatings was not further enhanced. Compared with the pristine PET substrate, the anhydride-containing polyacrylate-coated PET film has reduced Po 2 by 68%. This work provides a facile strategy for improving the oxygen barrier performance of PET film by coating amorphous polyacrylate.
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高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Chen Zhigang,Xu Yafeng,Ding Ding,Song Ge,Gan Xingxing,Li Hao,Wei Wei,Chen Jian,Li Zhiyun,Gong Zhongmiao,Dong Xiaoming,Zhu Chengfeng,Yang Nana,Ma Jingyuan,Gao Rui,Luo Dan,Cong Shan,Wang Lu,Zhao Zhigang,Cui Yi
Tungsten carbides, featured by their Pt-like electronic structure, have long been advocated as potential replacements for the benchmark Pt-group catalysts in hydrogen evolution reaction. However, tungsten-carbide catalysts usually exhibit poor alkaline HER performance because of the sluggish hydrogen desorption behavior and possible corrosion problem of tungsten atoms by the produced hydroxyl intermediates. Herein, we report the synthesis of tungsten atomic clusters anchored on P-doped carbon materials via a thermal-migration strategy using tungsten single atoms as the parent material, which is evidenced to have the most favorable Pt-like electronic structure by in-situ variable-temperature near ambient pressure X-ray photoelectron spectroscopy measurements. Accordingly, tungsten atomic clusters show markedly enhanced alkaline HER activity with an ultralow overpotential of 53 mV at 10 mA/cm 2 and a Tafel slope as low as 38 mV/dec. These findings may provide a feasible route towards the rational design of atomic-cluster catalysts with high alkaline hydrogen evolution activity.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 26
·39702-39711
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IF 5.19
Qiao Yongzhen,Yang Weisheng,Wang Xiu,Jiao Liang,Yang Yiqin,Wang Shumei,Bian Huiyang,Dai Hongqi
When old corrugated cardboard (OCC) is returned to the paper mill for repulping and reuse, the starch, which is added to the paper surface as a reinforcement agent, is dissolved into the pulping wastewater. Most of the OCC pulping wastewater is recycled to save precious water resources; however, during the water recycling process, the accumulation of dissolved starch stimulates microbial reproduction, which causes poor water quality and putrid odor. This problem seriously affects the stability of the papermaking process and product quality. In this study, phosphomolybdic acid (H 3 PMo 12 O 40 , abbreviated as PMo 12 ) was utilized to catalyze the waste starch present in papermaking wastewater to monosaccharides, realizing the resource utilization of waste starch. The results showed that the optimized yield of total reducing sugar (78.68 wt%) and glycolic acid (12.83 wt%) was achieved at 145 °C with 30 wt% PMo 12 at pH 2, which is equivalent to 91.51 wt% starch recovered from wastewater for resource utilization. In addition, the regeneration of the reduced PMo 12 was realized by applying a potential of 1 V for 2 h. Overall, this study has theoretical significance and potential application value for resource utilization of waste starch in OCC pulping process and cleaner management of OCC waste paper.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 8
·5564-5574
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IF 2.779
Li Zhen,Chen Yingying,Lang Haoze,Wan Jianghong,Gao Yan,Dong Haitao,Zhang Xiaoke,Feng Wenran
The ternary Pb–SnSe thin films were prepared using chemical bath deposition (CBD) and sensitized with iodine. The chemical formula of the films was recognized as Pb 0.8 Sn 0.2 Se, according to the stoichiometric ratio. The films are both centered cubic crystal structure and show preferred orientation in PbSe (200). The optical band gap ( E g ) is found to decrease after sensitization, due to the impurity energy levels created by PbI 2 . The photoelectric performance of the Pb 0.8 Sn 0.2 Se thin films is significantly improved after iodine sensitization. Accordingly, the resistance change rate, i.e., the photoelectric sensitivity is enhanced over 35%, which is over 161% for more than 4 on/off cycles. The density of states (DOS) of Pb 0.8 Sn 0.2 Se is calculated using the first-principle method. The calculation shows that the I dangling bond in sensitized Pb 0.8 Sn 0.2 Se introduces a large DOS inside the band gap and causes the narrowing of the band gap.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 2
·1-9
·
IF 3.061
Song Tao,Wang Qingyin,Li Jianguo,Chen Xuejun,Liu Shaoying,Wang Gongying
A new copolyesters of poly(2-[4-(2-hydroxyethoxy)phenoxy]ethyl-co-1,4-cyclohexylenedimethylene terephthalate) (PHCT) with different compositions were synthesized from terephthalic acid, 1,4-cyclohexanedimethanol and hydroquinone bis(2-hydroxyethyl) ether (HQEE) via esterification-polycondensation reaction. The synthesized copolyesters were analyzed by 1 H-NMR, FT-IR, GPC, intrinsic viscosity, DSC, TGA and tensile testing, respectively. The 1 H-NMR and FT-IR analysis confirm the successful introduction of HQEE into poly(1,4-cyclohexylenedimethylene terephthalate (PCT) chains. The introduction of HQEE into PCT chains can effectively lower the melting point of PCT, making it easier to process. The glass transition temperature of PHCT is higher than 70 ℃ and it has the comparable thermal stabilities to PCT. In addition, introducing HQEE into PCT chains can effectively improve the molecular weights of PCT, thus imparting PHCT with better mechanical performance relative to PCT. The PHCT is a tough polymer, which owns the higher Young’s modulus (above 300 MPa), the higher tensile strength (above 39 MPa) and the higher elongation at break (above 226%).
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2022
·Vol. 40
·期 4
·338-344
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IF 3.815
Yang Guang-Hui,Zhang Zhe,Yin Cong-Cong,Shi Xian-Song,Wang Yong
Two-dimensional covalent organic frameworks (COFs) with specific morphologies including nanofibers and nanoplates are highly desired in both nanoscience research and practical applications. Thus far, however, morphology engineering for COFs remains challenging because the mechanism underlying the morphology formation and evolution of COFs is not well understood. Herein, we propose a strategy of surfactant mediation coupled with acid adjustment to engineer the morphology of a β -ketoenamine-linked COF, TpPa, during solvothermal synthesis. The surfactants function as stabilizers that can encapsulate monomers and prepolymers to create micelles, enabling the formation of fiber-like and plate-like morphologies of TpPa rather than irregularly shaped aggregates. It is also found that acetic acid is important in regulating such morphologies, as the amino groups inside the prepolymers can be precisely protonated by acid adjustment, leading to an inhibited ripening process for the creation of specific morphologies. Benefitting from the synergistic enhancement of surfactant mediation and acid adjustment, TpPa nanofibers with a diameter down to ∼20 nm along with a length of up to a few microns and TpPa nanoplates with a thickness of ∼18 nm are created. Our work sheds light on the mechanism underlying the morphology formation and evolution of TpPa, providing some guidance for exquisite control over the growth of COFs, which is of great significance for their practical applications.
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高影响因子
Applied Nanoscience
·
2022
·Vol. 12
·期 5
·1545-1556
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IF 3.869
Yan Jia,Xie Shujie,Xia Qin,Li Xiang,Chen Shuhuai,Shen Jia
Combination cancer therapy may be facilitated using a nanoparticle-based drug delivery system. However, the therapeutic efficiency of cancer nanomedicines is reduced due to poor drug release into the cancer cells. To the treatment of liver malignancy, a PEGylated poly( α -lipoic acid) copolymer with mPEG- α PLA was constructed and exploited as a dual reduction/pH response nanocarrier to delivery of capsaicin (CAP) and doxorubicin (DOX). Due to their self-assembly in an aqueous solution, the mPEG- α PLA amphiphilic polymers could be effectively encapsulated on CAP and DOX to synthesize CAP and DOX co-loaded nanomaterials (CAP/DOX@NPs). After being prepared, the CAP/DOX@NPs released more CAP and DOX in response to reduction and acid stimuli than those left undamaged. According to the results of flow cytometry and confocal laser scanning microscopy, the HepG2 liver cancer cells rapidly absorbed the dual-drug-loaded nanoparticles and released drugs intracellularly. As a result, in HepG2 cells, CAP/DOX@NPs promoted increased cell death and had synergistic therapeutic effects. In biochemical models such as acridine orange and ethidium bromide (AO/EB and nuclear DAPI staining), results were demonstrating the nanoparticles effectively induce apoptosis in HepG2 liver cancer cells. Moreover, in vivo systemic toxicity outcomes shown that the CAP/DOX@NPs could be quickly excreted from the body with no apparent toxicity signs. Overall, these findings demonstrate that the suggested technique for treating liver cancer with a dual-response nanocarrier based on mPEG- α PLA copolymer is promising.
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高影响因子
NPG Asia Materials
·
2022
·Vol. 14
·期 1
·1-11
·
IF 10.761
Chen Zheng,Wang Lin,Chen Chichi,Sun Jie,Luo Junchao,Cui Wenguo,Zhu Can,Zhou Xiaozhong,Liu Xingzhi,Yang Huilin,Shi Qin
Cell-derived extracellular matrix (ECM) has been applied in spinal cord injury (SCI) regeneration because of its various biological functions. However, insufficient mechanical properties limit its wide application. Herein, we developed GelMA/ECM hydrogel fibrous scaffolds (GelMA/ECM scaffolds) that can recruit and enhance the differentiation of neural stem cells (NSCs) by electrospinning and decellularization techniques. Moreover, the GelMA/ECM scaffolds had good mechanical properties and reinforced cell adhesion and proliferation. Compared to GelMA hydrogel fibrous scaffolds (GelMA scaffolds), GelMA/ECM scaffolds promoted more NSCs toward neurons by markedly enhancing the expression of MAP-2 and Tuj-1 and decreasing GFAP expression. In addition, the GelMA/ECM scaffolds significantly reduced the proportion of M1-phenotype macrophages, which is favorable for SCI repair. In vivo, the GelMA/ECM scaffolds recruited NSCs at the injured site, promoted neuron regeneration, and reduced the formation of glial scars and the inflammatory response, which further led to a significant improvement in the functional recovery of SCI. Therefore, this scaffold shows potential in regenerative medicine, mainly in SCI.
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高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 4
·795-806
·
IF 12.958
Li Daohao,Long Xiaojing,Wu Yaqian,Hou Huijie,Wang Xueyao,Ren Jun,Zhang Lijie,Yang Dongjiang,Xia Yanzhi
Developing low-cost, efficient oxygen reduction reaction (ORR) catalysts to replace Pt-based materials is urgently required for the application of Zn-air batteries (ZABs) and microbial fuel cells (MFCs). In this work, meso-microporous carbon fibers with tunable defect density were synthesized by carrageenan fibers. A highly defective carbon fiber (HDCFs) was produced which exhibited an outstanding ORR catalytic activity, reaching to the half-wave potential of 0.841 and 0.44 V in alkaline and neutral electrolytes, respectively. These HDCFs can also act as highly efficient air cathodes for ZABs (delivered potential of 0.69 V and power density of 220 mW cm –2 at 300 mA cm –2 ) and MFCs (high power density of 69.7 mW cm –2 ). Simulation by the density functional theory indicated that a high density of defections in a carbon based framework can remarkably modulate the electrical properties. For instance the charge entrapments in the carbon active sites may reduce the energy barrier of ORR. Graphical abstract
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 1
·725-738
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IF 2.843
Zhang Huadong,Yan Zhongyi,Yang Zhizhou,Mu Qiuhong,Peng Dan,Zhao Hui
Two low melting point phthalonitrile monomers (EPN and EEPN) containing flexible glycidyl groups were synthesized using hydroxyl-containing phthalonitrile and epichlorohydrin as raw materials. The structures of the synthesized monomers were characterized by Fourier transform infrared (FT-IR), nuclear magnetic resonance ( 1 H-NMR and 13 C-NMR) spectra and elemental analysis. Then each of them was blended with 4-(4-aminophenoxy)-phthalonitrile (APPN) and cured to obtain two kinds of amine-catalytic phthalonitrile-based crosslinked polymers. DSC results showed that two blending systems underwent a two-stage polymerization process with the increase of curing temperature. Rheological measurements exhibited that the introduction of glycidyl groups to phthalonitrile resin could greatly improve its processability. Moreover, after thermal cured at 300 ℃, the resulting phthalonitrile resins exhibited excellent mechanical performance, thermal and thermo-oxidative stability.
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 2
·1817-1829
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IF 2.843
Yang Yinzhi,Fan Fangwei,Xie Jinpeng,Fang Kaiyang,Zhang Qiang,Chen Yiren,Cao Xinwang,Deng Zhongmin
The composition of bamboo shoot shell is similar to hemp fiber, and whose traditional degumming process is expensive and easy to cause serious environmental pollution. Herein, acid pretreatment combined with alkali-oxygen bath degumming process was used to obtain bamboo shoot shell fibers. The effects of the dosages of sodium hydroxide and hydrogen peroxide, soaking temperature and time on degumming were discussed. The optimized process parameters of alkali-oxygen bath degumming were obtained by orthogonal experiment as follows: sodium hydroxide 24 g/L, hydrogen peroxide 40 mL/L, scouring temperature 95 °C and alkali boiling time 150 min. The degumming rate was 72.14%. The degummed fibers were separated from each other in a single fiber state, compared to that the control samples were closely arranged by lots of fibers with rough surface caused by the presence of many non-cellulose components. The crystallinity increased from the control (43.53%) to final fiber (64.35%). The prepared bamboo shoot shell fiber is rich in cellulose (73.19%), which would provide some references for the future application and development of bamboo shoot shell fiber potentially and widely used in many aspects.
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高影响因子
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