Polymers
·
2018
·Vol. 10
·期 5
·464
·
IF 2.935
Qinglin Huang,Yan Huang,Shangpeng Gao,Mengyuan Zhang,Changfa Xiao
Novel poly(tetrafluoroethylene) (PTFE) hollow fiber membranes were successfully fabricated by electrospinning, with ultrafine fibrous PTFE membranes as separation layers, while a porous glassfiber braided tube served as the supporting matrix. During this process, PTFE/poly(vinylalcohol) (PVA) ultrafine fibrous membranes were electrospun while covering the porous glassfiber braided tube; then, the nascent PTFE/PVA hollow fiber membrane was obtained. In the following sintering process, the spinning carrier PVA decomposed; meanwhile, the ultrafine fibrous PTFE membrane shrank inward so as to further integrate with the supporting matrix. Therefore, the ultrafine fibrous PTFE membranes had excellent interface bonding strength with the supporting matrix. Moreover, the obtained ultrafine fibrous PTFE hollow fiber membrane exhibited superior performances in terms of strong hydrophobicity (CA > 140°), high porosity (>70%), and sharp pore size distribution. The comprehensive properties indicated that the ultrafine fibrous PTFE hollow fiber membranes could have potentially useful applications in membrane contactors (MC), especially membrane distillation (MD) in harsh water environments.Keywords:electrospinning;ultrafine fibrous;PTFE;hollow fiber membrane
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
·
2025
·Vol. 38
·期 1
·21-27
·
IF 0.7
Rui Hou,Aojie Liu,Chao Lv,Ning Zeng,Zezheng Zhang,Siyi Liu,Qin Li,Akira Watanabe,Gang Jiang,Jinguang Cai
High-conductive ultra-thin metallic wires, as basic structures in electronic devices, are highly demanded but challenging to improve the integration level and miniaturization of the devices. In this study, an efficient laser direct writing approach was proposed and aimed at preparing Ag wires with widths as narrow as 2 μm by irradiating the AgNO3-polymer film with a compact blue-violet laser. A comprehensive exploration of various parameters was conducted, leading to the optimization of Ag wires exhibiting an impressively low resistivity of 2.35×10-7Ω·m. In addition, an Ag wire prepared by laser direct writing on the flexible PEN substrate shows high tolerance to the inward and outward bending, demonstrating excellent flexibility and mechanical stability. On this basis, a UV-light detector based on the laser-irradiated interdigitated Ag patterns and sensitive CdS nanorods was demonstrated with high sensitivity and fast response.
研究领域:
材料科学
·
微纳加工
·
光电检测
·
柔性电子器件
✓ 已验证
产品关联
DOI
高影响因子
POWDER METALLURGY
·
2025
·
IF 1.8
Xiao-Chun Deng,Guo-Hua Zhang
In this work, the ultra-fine grain WC-10Co alloys were prepared through a two-step sintering process comprising steps of low-temperature sintering for a long time and high-temperature sintering for a short time. The effects of sintering methods (one-step/two-step sintering) on the microstructure, density, grain size and performance of WC-10Co hard metals with or without VC addition were investigated. The densities of all samples were lower than 97.0% in one-step sintering. After two-step sintering, the relative densities of all samples were increased, and those of the samples without VC were higher than 98.5%. In addition, there are a large number of grains with a high aspect ratio in the samples without VC. The pure WC-10Co alloy showed the best comprehensive mechanical properties after long-time (2 hours) sintering at a low temperature (1300 °C) and short-time (10 minutes) sintering at a high temperature (1450 °C), and the grain size, hardness and toughness of the sample were 0.70 μm, 15.35 GPa and 13.54 MPa·m1/2, respectively. The grain size of the sample containing 0.5 wt.% VC was only 0.26 μm under the same sintering conditions, which showed a high hardness of 18.14 GPa and a toughness of 8.56 MPa·m1/2.
研究领域:
材料科学
·
金属学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengen Hu,Xincan Gao,Zhen Wang,Xian Dang,Chengwan Yang,Xinyang Li,Ming Li,Yue Li,Xiaoye Hu,Zhulin Huang
Tungsten carbide (WC) cemented carbide plays a crucial role in cutting and mechanical processing. However, the grain coarsening that inevitably occurs during the high temperature sintering process of WC leads to a reduction in mechanical properties. This study presents a strategy for the one-step synthesis of tantalum carbide (TaC) grain inhibitors to enhance ultrafine grain WC ceramics. Specifically, WC-xTaC (where x = 0 wt%, 1 wt%, 2 wt%, 3 wt%, and 4 wt%) powders were synthesized directly in one step using a liquid phase method, thereby eliminating the effects of the ball milling process on the defect density and surface energy of the powders. The mechanical properties of the sintered blocks were evaluated after the synthesized WC-xTaC powders underwent hot press sintering. The results demonstrate a reduction in the grain size of WC from 1.96 μm to 850 nm after sintering compared to WC ceramics without TaC doping. The density of the material improved from 91.4 % to 97.8 %, while the hardness increased from 16.3 GPa to 24 GPa, reflecting an overall enhancement of 47.2 %. This research provides an optimized approach for the fabrication of ultrafine grained WC ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2019
·
IF 1.874
Lei Zhang,Jiaxin Wen,Zixi Zhang,Jun Yang,Hao Huang,Qiaoyu Hu,Hourong Zhuang,Hongyu Yu
As high-performance dielectric material , small sizes of barium titanate (BaTiO 3 ) are desirable for the application of multilayer ceramic capacitors . Herein, we synthesized ultrafine BaTiO 3 powders with mean particle size of ( d av. ) 156 nm, tetragonality ( c/a ) of 1.0092 and specific surface area ( S BET ) of 6.09 m 2 /g by two-step sintering process. Kinetic analysis of solid-state reaction reveals that the phase-boundary-controlled mechanism dominated the reaction process in two-step sintering process compared with one-step sintering process dominated by the first-order mechanism. It is also shown that enhanced nucleation in two-step calcination is beneficial for improving the tetragonality. In particular, the dielectric constant and dielectric loss of BaTiO 3 ceramics at the Curie temperature are found to be about 12800 and 0.003. This work demonstrates a strategy to trigger a method which can effectively improve the dielectric properties of BaTiO 3 ceramic.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Zhimei Wei,Qingyu Lin,Jie Yang,Shengru Long,Gang Zhang,Xiaojun Wang
Dual temperature- and pH-sensitive materials used as drug carriers have attracted a particularly high level of interest. However, it is limited by low sensitivity to changes in conditions because of large size and low specific surface area. In this work, novel dual temperature- and pH-sensitive poly( N -isopropylacrylamide- N -methylolacrylamide acrylic acid) (PNIPAm-NMA-AAc) ultrafine fibres were successfully prepared by radical copolymerisation, electrospinning and thermal chemical treatment. The PNIPAm-NMA-AAc ultrafine fibres were characterized by Fourier transform infrared (FTIR), proton nuclear magnetic resonance ( 1 H NMR), spectroscopy UV–visible spectroscopy, scanning electron microscopy (SEM) and cell counting kit-8 (CCK-8) assay. The uniformity and small size of PNIPAm-NMA-AAc ultrafine fibres with LCST range from 31 °C to 43 °C were used to drug carrier because of good thermal stability, no cytotoxic. Curcumin as a model drug was well distributed in PNIPAm-NMA-AAc ultrafine fibres. In addition, analysis of curcumin release at different pH values and temperatures confirmed that the PNIPAm-NMA-AAc ultrafine fibres are responsive to both temperature and pH. The maximum amount of curcumin released was 98.47% ± 1.87%. In addition, the release mechanism of curcumin-based PNIPAm-NMA-AAc ultrafine fibres was shown to conform to Fickian diffusion (r 2 ≥ 0.95). These results indicated that dual-responsive PNIPAm-NMA-AAc ultrafine fibres are promising as drug carriers.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chenguang Guo,Xingyu Li,Lin Zhang,Yuan Shi,Peng Zhang,Zichen Wei,En Mei,Zhongyou Que,Mingli Qin,Xuanhui Qu
Ultrafine-grained (UFG) VNbMoTaW refractory high entropy alloy (RHEA), reinforced with carbide particles, was prepared through a novel powder metallurgy route. Initially, pre-alloyed RHEA powder, characterized by body-centered cubic (BCC) phase, ∼88 nm particle size and good dispersity, was fabricated via a wet-chemical (WC) method. The high quality of the nano powder enabled low-temperature sintering with suppressed grain growth. Subsequently, a dense UFG VNbMoTaW RHEA bulk sample was fabricated by spark plasma sintering (SPS). It provided uniform microstructure with 99 % theoretical density and ∼320 nm grain size. The residual carbon from powder facilitated the precipitation of carbide phases in the sintering process. These carbide precipitates were identified by a high-entropy characteristic, ∼180 nm particle size and a volume fraction of 8.3 %, serving as effective reinforcing agents for the RHEA matrix. Benefiting from the high configurational entropy, ultrafine grain size, and precipitate phase, the bulk RHEA exhibited excellent mechanical properties in terms of a high hardness of 10.9 GPa and a compressive strength of 4.2 GPa with an acceptable strain of 10.7 %. We expect such a powder metallurgy route should also be applicable to other systems of RHEAs.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2019
·
IF 3.327
Jun-Kai Liu,Kai-Fei Wang,Kuo-Chih Chou,Guo-Hua Zhang
Ultrafine W-Cu composite powders with various copper (Cu) contents (5, 20 and 40 wt.%) have been fabricated by a method consisting of a carbothermic pre-reduction step and a subsequent hydrogen reduction step. After roasting the mixture of ammonium tungstate ((NH 4 ) 10 [H 2 W 12 O 42 ]· x H 2 O) and copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O), the mixture of CuWO 4 and CuO (or WO 3 ) was obtained. Subsequently, this mixture was pre-reduced by insufficient carbon black to generate the products containing W, Cu and a small amount of WO 2 which was further reduced to W in the following hydrogen reduction process. Thus, the ultrafine W-Cu composite powders were successfully produced. After sintering the green compacts made of these powders at 1100 ℃, 1150 ℃, 1200 ℃ and 1250 ℃, respectively, the microstructure, relative densities, electric conductivity and thermal conductivity of the sintered alloys were measured. The experimental results indicated that the higher the sintering temperature is, the better the performance of alloys will be.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Hanyu Jiang,Xuanjun Wang,Siyu Xu,Jin Yu,Zihao Zhang,Xiaogang Mu,Taizhong Huang,Fengqi Zhao
The 1,1-diamino-2,2-dinitroethylene (FOX-7) has been adopted in high-energy explosives. To further improve the thermal safety and detonation performance of FOX-7, a microfluidic crystallization platform with a swirl-shaped chip was employed to prepare ultrafine FOX-7. Results show that the crystal structure of FOX-7 could be precisely controlled by adjusting the operational parameters of microfluidic. The microfluidic techniques prepared superfine FOX-7 exhibit a consistent smaller particle size, narrower particle size distribution, reduced crystal defects, and enhanced sphericity structure. On the other hand, the thermochemical properties of FOX-7 are also improved. The thermal decomposition temperature and critical thermal explosion temperature of ultrafine FOX-7 are increased by 24.6 and 22.1 °C, respectively. The thermal stability, energy release efficiency, and combustion of the microfluidic recrystallization method prepared FOX-7 are greatly improved. This research presents a secure, effective, and eco-friendly methodology for the preparation and manipulation of ultrafine FOX-7 crystals.
研究领域:
材料科学
·
化学工程
·
爆炸物研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Xianrong Yang,Huan Shuai,Gaoxiang Du,Jiao Wang,Jie Shen
Ground calcium carbonate (GCC) has the effect of reducing the incremental cost and improving the application performance as a plastic filler. In this study, waterborne polyurethane (WPU) was employed as a novel modifier for the wet modification of GCC. Polypropylene (PP)-based composites incorporating GCC were then prepared for mechanical properties testing. The oil absorption value, wetting contact angle, and settling time in kerosene indicated that the modified GCC achieved an excellent modification effect with a WPU dosage of 2.0 wt%. The X-ray Diffraction, Fourier Transform Infrared Spectroscopy, and X-ray Photoelectron Spectroscopy results indicate that WPU was successfully coated on the surface of the GCC. SEM images revealed improved wettability and compatibility of GCC in the composites after modification. The mechanical tests showed that the GCC-WPU/PP composites exhibited enhanced properties, including a flexural strength of 107 MPa, impact strength of 9.54 kJ/m 2 , tensile strength of 29.7 MPa, and an elongation at break of 30.9%. Highlights WPU was innovatively used as a modifier of GCC. An optimal modification effect was gained at the low dosage (2.0 wt%). GCC has excellent compatibility and wettability in PP composites. The obtained PP-based composites have better mechanical properties. The study has the potential to apply GCC in plastics and other industries.
研究领域:
材料科学
·
高分子化学
·
塑料工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 57
·期 8
·5216-5227
·
IF 3.612
Zhongyue Tang,Jin Fan,Jintao Yang,Lu Liu,Laping He,Wei Zhang,Xuefeng Zeng,Likang Qin
Summary In this study, the ultrafine grinding (UG) and high pressure homogenization (HPH) treated slurry on the particle size and rheological property of slurry, texture, in vitro starch digestibility, and multiscale structure of steamed rice bread (SRB) were investigated. Then, it was found that the average particle size of slurry treated by UG and HPH reduced from 84.6 to 38.6 μm and 22.6 μm, respectively. The rheological properties results demonstrated that G′ resulted in higher values than G″, and that the values of G′, G″ and tan δ of slurry decreased obviously after UG and HPH treatment. Obviously, the hardness and viscidity of SRB made by UG and HPH were lower, while the elasticity and specific volume were higher. The determination of in vitro starch digestibility revealed that UG treated on slurry accelerated the starch hydrolysis rate of SRB, resulting in an increase in the pGI from 76.17 to 79.36, while HPH treatment reduced the pGI from 76.17 to 73.49. Furthermore, XRD and FTIR demonstrated that both UG and HPH increased the intermolecular hydrogen bonds, and both treatments also assisted in starch arrangement for increasing the ordered crystallization of starch, which may contribute to the increasing amylose content.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2024
·
IF 3.2
Lu Liu,Jingwen Xu,Ge Zhang,Nisi Gao,Xuebing Xu,Renyong Zhao
Effects of ultrafine grinding on the nutritional profile, physicochemical properties, and antioxidant activities of whole-grain highland barley (HB) including white highland barley (WHB) and black highland barley (BHB) were studied. Whole-grain HB was regularly ground and sieved through 80 mesh get 80 M powder, and HB was ultrafine grounded and sieved through 80 mesh, 150 mesh, and 200 mesh get 80UMM, 150UMM, and 200UMM samples. Particle size of WHB and BHB reduced significantly after ultrafine grinding. As the particle size decreased, moisture content of WHB and BHB decreased significantly, whereas fat content increased significantly. Redistribution of fiber components in WHB and BHB from insoluble to soluble fractions was also observed. Wherein, content of soluble pentosan of WHB and BHB increased significantly from 0.56% and 0.78% (80 M) to 0.91% and 1.14% (200UMM), respectively. Damaged starch of WHB and BHB increased significantly from 8.16% and 8.21% (80 M) to 10.29% and 10.07% (200UMM), respectively. Content of phenolic acid and flavonoid of WHB and BHB and associated antioxidant capacity were increased after ultrafine grinding. Color of L * value increased significantly, a * and b * values decreased significantly, indicating the whiteness of WHB and BHB was increased after ultrafine grinding. Pasting temperature of WHB and BHB decreased, whereas peak viscosity increased. X-ray diffraction patterns of HB showed typical A- and V-style polymorphs and the relative crystallinity of HB decreased as the particle size decreased. Taken together, ultrafine grinding has shown great potential in improving the nutritional, physiochemical, and antioxidant properties of whole-grain HB. Our research findings could help better understand the ultrafine grinded whole grain HB in food industry.
研究领域:
食品科学
·
植物学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）