Nanomaterials
·
2022
·Vol. 12
·期 4
·624
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IF 5.719
Yanjun Zhang,Yaxin Zhao,Rui Guo,Zengxing Zhang,Dan Liu,Chenyang Xue
Currently, there are several thermoelectric materials, such as Ag2Te, Bi2Te3, and Sb2Te3, that have been investigated for thermoelectric applications. However, the toxicity and rarity of most of these materials make them unsuitable for practical applications. In contrast, silver selenide (Ag2Se) is an abundant and environment-friendly thermoelectric material. This study provides a facile synthetic approach for preparing high-performance, low-cost, and flexible Ag2Se thermoelectric films. Ag2Se nanomaterials were prepared based on the chemical template method, and the reaction solution concentration was varied to systematically investigate the effects of reaction solution concentration on the characterization and thermoelectric properties of Ag2Se nanomaterials. For convenience of testing, the flexible Ag2Se films were prepared on porous nylon membranes using vacuum-assisted filtration. The prepared thermoelectric films were tested using an X-ray diffractometer, scanning electron microscope, Seebeck coefficient tester, and Hall tester. The film prepared from the solution with the lowest concentration (18.0 mM) demonstrated the best thermoelectric performance, with a maximum power factor of 382.18 μW∙m−1∙K−2at ~400 K. Additionally, a cold-pressing treatment could effectively enhance the electrical conductivity of the film, without damaging the substrate, as the conductivity of the film remained at 90% of the original value after 1500 bending cycles.Keywords:silver selenide;vacuum-assisted filtration;flexible film;thermoelectric properties
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
Biomedical Materials
·
2020
·Vol. 15
·期 6
·065012
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IF 3.174
Yu Luo,Lie Ma
Despite the good hemodynamic characteristics of bioprosthetic heart valves, it is inevitable that they will suffer from calcification and tissue deterioration. Decellularization has been utilized to reduce the immunogenicity and calcification of bioprosthetic heart valves. However, it can take several days or even weeks to obtain the decellularized tissues or organs. Therefore, time-frame should be taken into consideration during the decellularization process. A detergent-enzymatic-method, combined with vacuum, has been proposed as a method of obtaining desirable decellularized heart valves. In this study, heart valves treated under vacuum and normal atmosphere are investigated via histological, biochemical and mechanical analysis. The results show that the decellularization efficiency of heart valves treated under vacuum is enhanced, based on histological staining, DNA contents and α-Gal quantification. The decellularization procedures decrease the contents of the extracellular matrix. However, the mechanical properties, including elastic modulus, fracture tensile strength and fracture strain, show no significant difference between the samples. In vitro cell cytotoxicity experiments indicate the feasibility of further in vivo experiments. Therefore, we conclude that vacuum-assisted decellularization procedures can significantly enhance decellularization efficiency by reducing the decellularization time, without compromising the properties of the heart valves, which is also beneficial in terms of reducing clinical costs. To the best of our knowledge, vacuum is a novel parameter which can be designed into decellularization procedures for heart valves.
研究领域:
生物医学工程
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心血管外科
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DOI
PubMed
高影响因子
FIBERS AND POLYMERS
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2022
·Vol. 23
·期 7
·1817-1825
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IF 2.347
Cheng Kan,Gu Xinwang,Guo Mao,Li Mingzhuan,Lu Shengjun,Fan Haosen
In this paper, two kinds of proton donors, including water and ethanol, are introduced to prepare aramid nanofibers (ANFs) films. The formation mechanism of ANFs films and the influence of water and ethanol have been investigated. The main formation mechanism was demonstrated that ANFs could self-assemble into layered structure during the filtration process. The results showed that the ANFs films with water as proton donor had a tensile strength of 186.01 MPa and initial thermal decomposition temperature of 503.89 °C, which was 52.68 % and 11.79 % higher than those of the films prepared with ethanol as proton donor. Meanwhile, compared with spin coating and layer by layer self-assembly methods, vacuum assisted filtration was proved as an effective method to prepare the functional ANFs nanomembranes with highly regular and layered structures.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
POLYMER COMPOSITES
·
2018
·Vol. 40
·期 4
·1481-1491
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IF 1.943
Wenqi Wang,Jie Ying,Jikui Wang,Qiang Wang
In this article, the vacuum assisted resin infusion (VARI) process was employed to prepare anionic polyamide 6/montmorillonite (APA6/MMT) nanocomposites. The ɛ-caprolactam and MMT mixture are infused into the mold by vacuum. At the same time, the anionic polymerization of ɛ-caprolactam proceeds all the way which results in fast viscosity rise. To make the VARI process has more practical application value, enough infusion time is necessary. Three types of MMT were chosen in this paper: Na + -MMT, OMMT-CTAB, and OMMT-AUA. In order to study the effects of MMT on infusion process and material's performance, conversion, and temperature test, X-ray diffraction analysis, transmission electronic microscopy, thermogravimetric analysis, Molau test, and mechanical test were performed. The results indicated that the OMMT-AUA can both further improve the material's performance and has longer infusion time for VARI process. POLYM. COMPOS., 40:1481–1491, 2019. © 2018 Society of Plastics Engineers
研究领域:
材料科学
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聚合物复合材料
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Liming Zhang,Shiqing Hu,Zhongwei Cao,Bingjie Pang,Jingyi Wang,Peng Zhang,Xuefeng Zhu,Weishen Yang
Proton-conducting ceramic cells are promising devices for high-efficient energy conversion, while the preparation of defect-free electrolyte membranes is difficult and blocks their quick development. Here, a vacuum-assistant dip-coating method is developed to prepare defect-free BaCe 0.4 Zr 0.4 Y 0.1 Yb 0.1 O 3-δ (BCZYYb4411) proton-conducting electrolyte membranes on porous anode (40 wt%BCZYYb4411 - 60 wt%NiO) substrates. Unlike the conventional dip-coating process, by using the vacuum-assistant dip-coating method, defects (like running through pinholes, cracks) that would cause gas leakage, short-circuit and low open-circuit voltage (OCV) in following electrochemical tests can be eliminated. By tuning the mass concentration of electrolyte powders in the coating slurry, thin electrolyte membranes with different thicknesses can be reproducibly prepared. Proton-conducting fuel cells (PCFCs) with BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3-δ (BCFZY0.1) cathode show high OCV values closing to the theoretical value of 1.13 V at 600 °C, demonstrating that dense and defect-free electrolyte membranes are fabricated. The as-prepared PCFC with a 10-μm-thickness defect-free electrolyte membrane shows a high peak power density reaching up to 761 mW cm −2 at 650 °C and stability of more than 250 h at the current density of 200 mA cm −2 at 600 °C. All these results illustrate that the developed method is feasible to prepare dense and thin electrolyte membranes without defects for proton-conducting ceramic cells.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 24
·6494-6501
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IF 5.976
Yuming Wu,Kai Ye,Zhiduo Liu,Mengjie Wang,Kuan W. A. Chee,Cheng-Te Lin,Nan Jiang,Jinhong Yu
Materials with superior thermal conduction, stable electrical insulation, and excellent mechanical strength that can be obtained at low cost are desirable for electronic packaging and thermal management in electrical engineering systems. There is therefore relentless interest in developing highly robust thermally conductive and electrically insulating polymer-based composites. Herein, a facile and environmentally friendly method to construct three-dimensional thermal transport channels in a poly(vinyl alcohol) (PVA) matrix composite is reported. The formation of thermal transport highways improves the thermal conductivity up to 4.79 W m−1 K−1 for alumina (Al2O3) loading of 45.4 vol% in the composites. The thermal conductivity achieved is the highest value for this Al2O3 content range compared with reported work, and is 1700% compared with that of pure PVA. In the meantime, the composites still retain outstanding electrical insulation properties and excellent mechanical strength. The heat-conducting and electrically insulating composites not only have promising applications in electronic packaging and electrical engineering systems, but the technically facile vacuum-assisted infiltration method is a new avenue for the mass production of spherical filler/polymer composites.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 26
·期 10
·7823-7828
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IF 1.569
Zhang Biao,Ye Feng,Liu Shichao,Liu Qiang,Gao Ye
A simple method, which include cold isostatic pressing and vacuum assisted infiltration, that can significantly improve the filler content, was employed to fabricate Bisphenol-A cyanate ester resin (BADCy)/Ni 0.5 Ti 0.5 NbO 4 composites with high-k and ultra-low-loss. Results show that briquetting pressure and sintering temperature for fabricating Ni 0.5 Ti 0.5 NbO 4 porous preforms have a great influence on the properties of BADCy/Ni 0.5 Ti 0.5 NbO 4 composites. The optimal process for the fabrication of BADCy/Ni 0.5 Ti 0.5 NbO 4 composites is fixing the briquetting pressure at 90 MPa and sintering temperature at 700 °C. The dielectric constant and loss of the composites are 22.79 and 4.17 × 10 −3 at 9041 MHz, respectively. Properties of this kind of composites can meet the requirements for high-k and ultra-low-loss PCB application.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Su-Yan Zou,Yu-Hua Huang,Yu-Chuang Fang,Cong-Yi Sheng,Dong-Dong Huang,Dai-Bin Kuang,Xu-Dong Wang
Large-area perovskite (PVK) X-ray detectors exhibit significant potential for commercial applications. However, the production of uniform and dense thick films as well as achieving efficient carrier transport over tens of microns in thick PVK films, remain major challenges for highly sensitive X-ray detection. Herein, an innovative vacuum-assisted blade coating strategy is proposed using PVK inks that strictly controls the nucleation and growth of PVKs to prepare large-area, high-quality MAPbI 3 homojunction thick films. Arising from the formation of a type II homojunction between the top and bottom PVK layers, and effective reduction of the density of defect states, the resultant homojunction film exhibits impressive performances, including an increase in carrier lifetime from 1272 to 9335 ps, an increase in surface photovoltage change from 93 to 386 mV, and nearly three times higher carrier mobility-lifetime product compared with pristine NMP-PVK film. Consequently, the X-ray detector based on homojunction film demonstrates a high sensitivity of 1.3 × 10 5 µC Gy air −1 cm −2 , surpassing the most previously reported values for X-ray detector using blade coating method. This research provides a convenient approach for preparing large-area PVK thick films and establishes a solid foundation for the development of X-ray detection.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Jingxian Hua,Chang Li,Hongxu Tao,Lei Wang,Eryue Song,Haiqian Lian,Chongqing Wang,Jinlong Jiang,Yichang Pan,Weihong Xing
Polymer coating post-treatment strategy of the zeolitic imidazolate framework (ZIF) membranes offers a versatile and feasible opportunity to restrict the intrinsic flexibility of ZIF framework and improve their gas separation performance. Herein, two different coating methods (Vacuum-assisted drip coating (VADC) and Static drip coating (SDC)) are utilized to prepare PDMS/ZIF-8 composite membranes based on ZIF-8 membranes with different compactness (high, medium and low-quality membrane) for investigating the effect of the contact area between PDMS layer and ZIF-8 membrane on C 3 H 6 /C 3 H 8 separation performance of PDMS/ZIF-8 composite membranes. The results reveal that the increase of the contact between PDMS layer and ZIF-8 membrane can enhance the contact confinement effect on the flexibility of ZIF-8 framework, resulting in a higher improvement of the separation performance for C 3 H 6 /C 3 H 8 of PDMS/ZIF-8 composite membranes with pressure. The prepared composite membrane based on VADC method showed a significant improvement in C 3 H 6 /C 3 H 8 separation factor (77–102) with slight increase in C 3 H 6 permeance (about 10%) at feed pressure of 7 bar. Moreover, this facile vacuum-assisted drip strategy attenuated the impact of the quality of ZIF-8 membranes on fabrication reproducibility of the composite membranes, which can withstand high pressure. Therefore, this work advances ZIF-8 membrane moving forward to industrial C 3 H 6 /C 3 H 8 separation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 7
·3025-3037
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IF 4.5
Zhang Kai,Sun Yinjie,Hou Sifan,Li Guoqi,Fan Jinpeng
Multi-scale BN/SiC ceramic with high toughness was successfully prepared by vacuum-assisted filtration. The BN/SiC ceramic bulk is composed of macroscopic laminated structure and microscopic brick–mortar structures in layer. In this ceramic, improving toughness relies on the design of multi-scale structure. The ordered arrangement of BN sheets and SiC form a ceramic layer with a structure similar to brick and mortar. At the same time, the SiC layer and BN/SiC layer are alternately arranged by layer-by-layer deposition method to form the macro-layer structure. The thickness of SiC layer and BN/SiC layer is only about 74 μm and 7.6 μm, respectively. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN/SiC layer. The delamination cracks occurred inside the BN/SiC layer or at the interface between SiC and BN/SiC layers. The BN/SiC laminated ceramic possesses high toughness (9.37 MPa m 1/2 ) when the BN content is 20wt.%, which is much higher than that of pure SiC bulk (3.45 MPa·m 1/2 ).
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Siqi Wu,Fei Wang,Shenghua Zhou,Li Long,Zhe Yang,Chuyang Y. Tang
Thin-film composite (TFC) reverse osmosis (RO) membranes fabricated by interfacial polymerization (IP) have been widely applied in seawater desalination. Nevertheless, their separation performance is limited by the permeance-selectivity upper bound. Compared to conventional synthesis/modification techniques, the manipulation of amine monomer distribution for the IP reaction has been far less investigated. In this study, we systematically investigated three classical approaches for m -phenylenediamine (MPD) loading during the IP reaction, i.e., vacuum filtration (TFC-V), roller (TFC-R), and air gun (TFC-A). Our results suggested that the vacuum-assisted approach can greatly enhance the availability of MPD monomers , which could, in turn, result in enhanced “ridge-and-valley” morphology of the polyamide rejection layer as a result of the enhanced nanofoaming effect. Furthermore, the TFC-V membrane demonstrated the highest water permeance of 2.8 ± 0.4 L m -2 h −1 bar −1 compared to TFC-R and TFC-A membranes of 2.1 ± 0.2 L m -2 h −1 bar −1 and 2.1 ± 0.4 L m -2 h −1 bar −1 , respectively. This study provided mechanistic insights to facilitate an improved understanding of membrane synthesis–structure–performance relationships.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 7
·4047-4054
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IF 5.2
Fangjuan Wu,Shangda Yang,Li Huang,Jiahuan Hu,Guifeng Li,Haoxiang Chen,Hui Fang
Carbon fiber fabric reinforced poly(lactic acid) (CFF/PLA) composites were manufactured using both vacuum-assisted resin transfer molding (VARTM) and compression molding (CM) methods. Of the two methods, the CFF/PLA-VARTM composite shows superior carbon fiber infiltration and interfacial adhesion compared to the CFF/PLA-CM composite. The improved infiltration enables the carbon fibers to induce a dense group of PLA crystal nuclei along their surface, resulting in the formation of a trans-crystalline layer (TCL) structure where the PLA lamellae grow perpendicular to the fiber axis. As a result, the interfacial adhesion is improved, and the crystallinity of the PLA in the CFF/PLA-VARTM composite is 4.1 times higher than that of pure PLA. However, the weak infiltration of fibers and matrix in CFF/PLA-CM composite results in poor load-bearing ability. Conversely, CFF/PLA-VARTM composite presents better interlayer bonding and tight fiber-matrix wrapping, promoting effective tensile load transfer to carbon fibers, which results in higher strength and modulus. The presence of TCL structures also plays a key role in improving mechanical properties. Overall, these findings demonstrate a promising method for producing high-performance PLA composites.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）