INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Yunbo Wu,Ye Ying,Yuhong Liu,Haijiang Zhang,Jianying Huang
Poly (vinyl alcohol) (PVA) and chitosan (CH)-based blend films were prepared via a simple mixing and casting method. The films were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and ultraviolet–visible spectroscopy (UV–vis). Mechanical properties, thermogravimetric (TG), derivative thermogravimetric (DTG), and the inhibition of biofilm formation against Pseudomonas aeruginosa PAO1 ( P. aeruginosa PAO1) of CH/PVA films were investigated. The results indicated that CH and PVA in the blend films interacted by physical crosslinks consisting of intermolecular hydrogen bonds and intermolecular hydrogen bonds with compatibility, and were more thermally-stable than that of PVA. CH addition decreased the tensile strength and the light transmittance. CH60:PVA40 film showed notable activity against adhesion and inhibited biofilm formation of P. aeruginosa PAO1, indicating that CH60:PVA40 film could be applied as an antimicrobial and biofilm inhibiting food packaging material .
研究领域:
生物材料学
·
微生物学
·
食品科学
·
高分子科学
·
抗菌材料
·
包装工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Ziqi Zhu,Pei Yang,Minzhi Chen,Tao Zhang,Yizhong Cao,Wei Zhang,Xiaoyan Zhou,Weimin Chen
Carbon dots (CDs) have sparked tremendous attention owing to their unique properties and great potential in various fields. Herein, novel amphiphilic CDs (ACDs) were synthesized solvothermally by microwave heating a mixture of xylose and ethylenediamine in N, N-dimethylacetamide. The xylose-derived ACDs were monodisperse nanoparticles with an average diameter of about 1.81 nm, and exhibited excitation-dependent emission behavior in both aqueous and several common organic solvents . Furthermore, the synthesized ACDs can be uniformly dispersed into polyvinyl alcohol (PVA) solution to fabricate transparent luminescent composites, the as-prepared PVA/ACDs composites not only exhibited excellent fluorescence with excitation-dependent emission performance, but also achieved water-induced shape memory behavior. The intrinsic reason and pH sensitivity of shape recovery were investigated, the results confirmed that a faster shape recovery can be obtained in water at pH 4 within 180 s. Further investigation illustrated that the sensitivity of additional hydrogen bonding between PVA and ACDs to the water molecular was highly related to the shape recovery of the luminescent composite. The green synthesis route for xylan-derived ACDs and fabrication of smart luminescent composite will open many possibilities for the valuable application of low-cost biomass.
研究领域:
纳米材料学
·
高分子科学
·
生物医学工程
·
功能材料
·
绿色化学
·
智能材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 7
·9083-9089
·
IF 3.83
Hongli Liu,Lantian Zhang,Jing Li,Hongyan Li,Guoqing An,Yajing Li,Zhong Chen
SiBCN ceramic aerogels have excellent properties such as ultra-high temperature stability, low density and high thermal insulation . The aerogels have better potential applications in aerospace and other fields. However, similar to inorganic aerogels , the low mechanical strength of SiBCN ceramic aerogels are the main limitation of its application. Based on the principle of inorganic double network enhancement, the first network was constructed by PVA and HNTs , and HNTs/SiBCN dual network aerogels were constructed by SiBCN ceramic aerogels as the second network. The structure and mechanical properties were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), specific surface area analyzer and pressure tester. Compared with SiBCN ceramic aerogels, 6 wt% HNTs-SiBCN ceramic hybrid aerogels have better microscopic properties (maintaining basic porous network structure and structural stability) and mechanical properties.The continuous HNTs first network can effectively transfer the stress load and enhance the strength of SiBCN ceramic aerogels.
研究领域:
材料科学
·
无机非金属材料
·
纳米复合材料
·
航空航天材料
·
高分子复合材料
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DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 304
·期 1
·1800477
·
IF 2.69
Ziqiang Xu,Wenlei Li,Zhi Chen,Dongxia Wang,Tingting Feng,Hanna Potapenko,Mengqiang Wu
A novel porous membrane of chemically modified polyvinyl butyral (mPVB), with improved thermal properties and chemical stability for lithium ion battery applications, is successfully synthesized by utilizing the chain extension reaction of the OH units from PVB. The porous mPVB membranes are obtained via the tape casting and phase inversion method. The corresponding gel polymer electrolyte (GPE) is achieved by immersing the as-prepared membranes in the liquid electrolyte. The electrochemical performances of the GPE show that the mPVB membranes have the features of good uniformity, high porosity ( ≈ 90%), great thermal stability, and high mechanical strength. Moreover, the GPE exhibits good chemical stability, a wide electrochemical window, as well as high ionic conductivity ( ≈ 1.21 × 10 −3 S cm −1 ). A test of a Li/GPE/LiFePO 4 battery cell shows a capacity of 147.7 mAh g −1 and excellent cycling stability, demonstrating the great potential of the mPVB-based GPE for lithium ion battery applications.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
电池技术
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Yi-Ren Tang,Jun Xu,Bao-Hua Guo
Hexagonal boron nitride nanosheets (BNNSs) were prepared by a facile chemical exfoliation method. Then cosolution film casting method was used to obtain poly(butylene adipate) (PBA)/BNNSs nanocomposites. The incorporated BNNSs changed the formation condition of the polymorphic crystals of PBA. The results of differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) showed that BNNSs significantly facilitated the formation of α-form crystals for isothermal and nonisothermal crystallization. Compared to pure PBA at 28 °C, the α-form crystals would not disappear until the temperature decreased to 13 °C with the addition of 0.5 wt % BNNSs. In addition, the excellent heterogeneous nucleation ability of BNNSs was identified by the nonisothermal and isothermal crystallization process. The enzymatic degradation experiments exhibited that PBA/BNNSs nanocomposites possessed a considerably lower degradation rate than neat PBA. This work demonstrates that BNNSs is an efficient material to regulate the formation of polymorphic crystals and the degradation behavior of PBA.
研究领域:
高分子材料科学
·
生物降解材料
·
结晶学
·
纳米复合材料
·
聚合物物理化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Shanghua Feng,Binbin Zhao,Yu Liang,Lei Liu,Jinxiang Dong
Tungsten and aluminum were directly incorporated into SBA-15 via one-step synthesis method under an acidic medium. The W- and Al-incorporated SBA-15 was applied as support for Pt nanoparticles to catalyze glycerol hydrogenolysis toward 1,3-propanediol. A combination of the characterization techniques showed that the tungsten and aluminum were incorporated into SBA-15 homogeneously, and the platinum nanoparticles could be uniformly dispersed on the modified-SBA-15. The catalytic performance of Pt-loaded SBA-15 could be significantly improved after the incorporation of tungsten and aluminum into SBA-15, reaching a 1,3-PDO selectivity near 50% when the glycerol conversion was 66%. The glycerol hydrogenolysis reaction proceeds through a dehydration–hydrogenation process, and the enhanced 1,3-PDO selectivity greatly benefited from the synergism between Brønsted acid and Lewis acid sites, which is tightly related with the incorporation of tungsten and aluminum species on the modified SBA-15.
研究领域:
催化化学
·
材料科学
·
绿色化学
·
能源化工
·
纳米催化
·
多相催化
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Wenxing Luo,Xiaowu Hu,Yinhui Che,Shuai Zu,Qinglin Li,Xiongxin Jiang,Dingjun Liu
Phase change materials (PCMs), which exhibit significant capacity of latent heat absorption and release during the phase change process , have been promisingly used for solar energy conversion and storage. However, the application of organic PCMs for solar energy storage remains a great challenge owing to their low thermal conductivity and liquid leakage problem. In this work, a form-stable PCM with polyethylene glycol (PEG) and epoxy resin (EP) was prepared by melt blending (the mass ratio is 1:1). The experimental results indicated that the leakage problem of PEG was solved by the cross-linking of the molecular chains of PEG and EP. Meanwhile, in order to improve the solar energy conversion capability and thermal conductivity , an extremely low loading (4 wt%) of expanded graphite (EG) modified with Ag nanoparticle was added into the PEG/EP matrix. The results suggested that Ag nanoparticles were uniformly dispersed by electroless silver plating in the surface of EG, and the electroless modified EG was evenly distributed in the PEG/EP matrix. Moreover, the composite fillers exhibited prominent solar energy conversion capability (90.7 %) and higher thermal conductivity (121 %). Therefore, this novel composite has favorable potential in practical applications of solar energy storage.
研究领域:
材料科学
·
能源化学
·
高分子化学
·
热力学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhe Liu,Xichao Mo,Shuhao Tian,Jie Chen,Yanpeng Liu,Haiyang Wu,Yawei Zhao,Yanrong Wang,Shanglong Peng
As one of the two-dimensional (2D) nanomaterials , MXene exhibits great potential on gas-sensing owing to its high specific area, rich functional groups and great charge transfer mobility. Herein, electrostatic adsorption and calcination strategies were taken for ZIF-derived Co 3 O 4 and alkalized Ti 3 C 2 T x MXene to fabricate Co 3 O 4 /MX7.5 heterojunction . It can be found that Co 3 O 4 nanoparticles (NPs) uniformly grow on the surface of alkalized Ti 3 C 2 T x . Alkalized Ti 3 C 2 T x with lower work function (lower than 3.9 eV) can transfer more electrons towards Co 3 O 4 and promote the redox of Co 2+ . These increased Co 2+ ions can help to adsorb more adsorbed oxygen and produce more oxygen defects, which enhances contact interaction between ethanol molecules and adsorption sites. The formation of heterojunction between Co 3 O 4 and MXene is observed by UV–vis spectra, and this interface effect enhances the ability of gas sensors. Therefore, the sensors based on the obtained Co 3 O 4 /MX7.5 heterojunction can operate at a relatively low temperature (140 °C) with a response of 3500 % and a low detection limit of 1 ppm. And it also delivers long-term stability (about 30 days). This work demonstrates practical application for detecting ethanol at a relatively low working temperature and keeping their response in a long term.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
表面化学
·
功能材料
✓ 已验证
DOI
高影响因子
Science Advances
·
2019
·Vol. 5
·期 1
·
IF 12.804
Hengwei Wang,Xiang-Kui Gu,Xusheng Zheng,Haibin Pan,Junfa Zhu,Si Chen,Lina Cao,Wei-Xue Li,Junling Lu
The prominent size effect of metal nanoparticles shapes decisively nanocatalysis, but entanglement of the corresponding geometric and electronic effects prevents exploiting their distinct functionalities. In this work, we demonstrate that in palladium (Pd)–catalyzed aerobic oxidation of benzyl alcohol, the geometric and electronic effects interplay and compete so intensively that both activity and selectivity showed in volcano trends on the Pd particle size unprecedentedly. By developing a strategy of site-selective blocking via atomic layer deposition along with first principles calculations, we disentangle these two effects and unveil that the geometric effect dominates the right side of the volcano with larger-size Pd particles, whereas the electronic effect directs the left of the volcano with smaller-size Pd particles substantially. Selective blocking of the low-coordination sites prevents formation of the undesired by-product beyond the volcano relationship, achieving a remarkable benzaldehyde selectivity and activity at the same time for 4-nm Pd. Disentangling the geometric and electronic effects of metal nanoparticles opens a new dimension for rational design of catalysts.
研究领域:
催化化学
·
纳米材料科学
·
物理化学
·
表面科学
·
分子催化
✓ 已验证
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Beijiao Cui,Bin Guo,Huimin Wang,Doudou Zhang,Haiyan Liu,Ligai Bai,Hongyuan Yan,Dandan Han
A composite monolithic column was prepared by redox initiation method for the on-line purification and enrichment of β-sitosterol, in which graphene oxide (GO) was embedded. The obtained monolithic column was characterized by scanning electron microscopy (SEM) and nitrogen adsorption-desorption isotherm measurement, which indicated that the monolith possessed characteristics of porous structure and high permeability. Under the optimum conditions for extraction and determination, the calibration equation was y = 47.92 × −0.1391; the linear range was 0.008–1.0 mg mL −1 ; the linear regression coefficient was 0.998; the limit of detection (LOD) is 2.4 μg mL −1 ; the limit of quantitation (LOQ) was 8 μg mL −1 ; precisions for intra-day and inter-day assays presented as relative standard deviations were less than 4.3% and 6.8%, respectively. Under the selective conditions, the enrichment factor of the method was 119. The recovery was in the range of 80.40–98.00%. Moreover, the adsorption amount of the monolith was compared with silica gel-C18 adsorbent and the monolith without graphene oxide being embedded. The polymerization monolithic column showed high selectivity and good permeability, and it was successfully used as on-line solid-phase extraction (SPE) column for determination of β-sitosterol in edible oil .
研究领域:
分析化学
·
食品科学
·
色谱学
·
材料科学
·
天然产物化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Liping Zhen,Genping Meng,Yongjie Yang,Mo Zhang,Bo Zhou,Huazhi Wang
Tuning the pore structure of scaffold materials is an effective avenue to preclude the leakage issue of phase change materials (PCMs) and optimize the thermal energy storage capacity of composites for practical applications. Herein, we precisely tuned the pore configuration of nano-aluminosilicate aggerates (n-ASA) by desilication-rearrangement mechanism to systematically investigate the influence of pore size on the energy-storage performance of polyethylene glycol (PEG)-based composites. n-ASA scaffolds with the mean pore size from 11.2 to 27.0, 51.7 and 111.0 nm were synthesized respectively, and the corresponding PCM composites n-ASA*n@PEG were prepared successfully. Among them, n-ASA*1@PEG exhibited the highest heat storage performance on account of the moderate pore size of 27.0 nm and the highest pore volume in all the prepared scaffolds. The load of PEG in the composite reached 81.0 wt%, and the corresponding melting and solidifying enthalpies were 139.8 J/g and 123.8 J/g, respectively. Furthermore, the mechanism of desilication-rearrangement is ideally suited for tailoring the pore size of silica matrixes, and the modulation of pore characteristics would be a feasible protocol to construct efficient energy-storage systems.
研究领域:
材料科学
·
能源化学
·
纳米材料
·
热物理
·
功能材料
·
储能技术
✓ 已验证
DOI
高影响因子
ANALYST
·
2013
·Vol. 138
·期 10
·3046-3052
·
IF 3.969
Xuming Zhuang,Dalei Wang,Lifen Yang,Ping Yu,Wei Jiang,Lanqun Mao
Simple and effective measurement of Mg2+ in the brain of living animals is of great physiological and pathological importance. In this study, we report a facile yet highly selective colorimetric method for effective sensing of cerebral Mg2+. The method is based on rational design of surface chemistry of gold nanoparticles (Au-NPs) with functional molecules including 1,4-dithiothreitol (DTT) and cysteine, enabling the fine tuning of the surface chemistry of Au-NPs in such a way that the addition of Mg2+ into the Au-NPs dispersion could selectively trigger the change of the dispersion/aggregation states of Au-NPs. The strong chelation interaction between Mg2+ and the hydroxyls in 1,4-dithiothreitol and the co-existence of cysteine on the surface of Au-NPs could, on one hand, enable the selective colorimetric detection of Mg2+ and, on the other hand, avoid the aggregation of Au-NPs induced by DTT itself. As a result, the addition of Mg2+ into the dispersion of the Au-NPs containing both cysteine and DTT results in the changes in both the color and the UV-vis spectra of the Au-NPs dispersion. The signal readout shows a linear relationship of Mg2+ within the concentration range from 1 μM to 40 μM with a detection limit of 800 nM (S/N = 3). Moreover, the assay demonstrated here is free from the interference of some physiological species commonly existing in rat brain. Although Ca2+ could interfere with the detection of Mg2+ because of its strong chelation with DTT, it could be selectively masked by masking agent (i.e., ethyleneglcol-bis (2-aminoethylether) tetraacetic acid). By combining the microdialysis technique, the basal dialysate level of Mg2+ is determined to be 299.2 ± 41.1 μM (n = 3) in the cerebral systems. The method essentially offers a new method for the detection of Mg2+ in the cerebral system.
研究领域:
神经化学
·
分析化学
·
纳米生物技术
·
分子探针
·
金属离子传感
·
活体分析
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）