JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 15
·12002-12015
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IF 2.779
Wang Wenwei,Hu Yongcai,Li Liangjie,Zeng Jinling,Yao Yingbang
In this study, the contents of ethyl cellulose (EC) as thickener in organic vehicle, which also acts as a binder, was examined using various control experiments; dibutyl phthalate (DBP) and dioctyl phthalate (DOP) were used as plasticizers, and acrylic resin (AR) was used as the thixotropic agent. In addition to thixotropic index, Bigham and Casson yield stress models were used for simulation, and the organic vehicle was dynamically simulated via the three interval thixotropy test; the viscosity recovery of the organic vehicle was investigated on the removal of shear stress. When the contents of the plasticizers, DBP and DOP, were 4 wt% and 6 wt%, respectively, the content of the thickener, EC, was 12 wt% and that of the thixotropic agent, AR, was 2 wt%, the comprehensive performance of the organic vehicle was greatly improved, especially in terms of thixotropy and recovery behavior. Our results demonstrate that the current organic vehicle is promising for the application of silver pastes used as inner electrodes in low-temperature co-fired ceramic (LTCC).
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Materials
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2022
·Vol. 15
·期 5
·1953
·
IF 3.748
Yujun Gao,Jingjing Feng,Feng Liu,Zhifu Liu
Silver paste is widely used for low-temperature co-fired ceramic (LTCC) electrodes. In this work, a kind of LTCC silver paste for fine-line screen-printing was developed by considering the effect of the organic vehicle on rheological behavior and screen-printing properties. A step-by-step volatilization mode was applied to screen the mixed organic solvent ofα-terpineol, 2-(2-butoxyethoxy) ethyl acetate (BCA) and dibutyl phthalate (DBP). Theα-terpineol:BCA:DBP ratio of 5:2:3 is selected by considering the volatility, viscosity, and pseudoplasticity of the organic vehicle. Both viscosity and pseudoplasticity of shear-thinning increase with the increase of ethyl cellulose (EC) organic binder content. Three interval thixotropy test (3ITT) was conducted to discuss the thixotropy of silver paste. The minimum printing line width of 13.27 µm is obtained using silver paste with 10 wt% EC, confirming that the homemade paste has good printability.
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
ENERGY
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2025
·
IF 9.4
Yiting Yang,Ming Li,Shengmei Zhang,Yali Liu,Ying Zhang
Microencapsulated phase change slurry has become a research hotspot in the field of cold energy storage due to its high latent heat and microconvection effects. However, its instability and low thermal conductivity limit its practical applications. This study adopted the phase-change microcapsules with a tetradecane core and a polymethyl methacrylate shell, which is suitable for the food preservation temperature range between 3 °C–8 °C. The effects of different kinds of carrier fluids, surfactant types and graphene concentrations on the materials thermal performance and thermal conductivity were explored experimentally. The results indicate that the optimal carrier liquids consisted of deionized water and isopropyl alcohol in a mass ratio of 3.58:4.24, with a carrier liquid density of 0.87 g/cm 3 . The phase-change microcapsule suspension maintained dispersion stability for 30 days when the hydrophilic-lipophilic balance value of the sodium dodecyl sulfate and Hexadecyl trimethyl ammonium chloride composite surfactant was 27.9 and their mass ratio was 1:1. The thermal conductivity and circulation stability of phase-change microcapsule suspensions were enhanced by incorporating highly thermally conductive two-dimensional graphene materials. The highest thermal conductivity reaches 0.3092 W/(m·K) with the graphene concentration of 1 wt%, representing a 7.26% improvement compared to the suspension without graphene. After 100 clod thermal cycles, the latent heat loss of the composite suspension remained within 14.5%, which means the graphene improved the cycle stability of the suspension. The study gives a reference for the preparation of high-efficiency energy storage functional fluids.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Hang Yang,Junfeng Wang,Dongbao Wang,Daorui Wang,Jian Gao,Bin Li
The regulation of particle-laden droplet behavior is crucial for interfacial heat and mass transfer in the liquid-liquid reaction systems. Accordingly, a clear understanding of droplet dynamic behaviors is of crucial importance. In this study, the behaviors of solid-particle-laden droplets in an immiscible dielectric liquid are experimentally investigated under the effect of a non-uniform AC electric field by high-speed imaging. The evolution processes of droplet formation, coalescence, dispersion as well as liquid bridge are analyzed systematically in variable applied voltages and particle concentrations. Results show that the droplet formation process are accelerated by increasing particle concentration, producing smaller droplets. When the applied voltage exceeds a certain threshold, the charged droplet coalescence occurs while the presence of particles would reduce this critical voltage. Cascade coalescence happens in the pure system with increasing voltage while the particle-laden droplets tend to coalesce individually. The droplet dispersion is found to dominate at high electric field strengths with its oscillation angle increased by particle concentration. Additionally, the liquid bridge expansion is reduced by the addition of particles, hindering the droplet coalescence. These findings provide insights into the regulation of particle-laden droplet behavior under the effect of electric fields.
研究领域:
流体力学
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电液动力学
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多相流
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化学工程
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胶体与界面科学
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DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2025
·
IF 3
Yebing Tian,Cheng Qian,Xiangyu Yuan,Kunal Arora,Guangyi Wu,Zepeng Chen,Qi Wang
Magnetorheological shear thickening polishing (MRSTP) has garnered significant attention in the field of ultra-precision polishing. However, current studies have primarily concentrated on the rheological properties of MRSTP fluids (MRSTPFs) and their application in polishing planar workpieces. The study investigated the sedimentation behavior, magnetization property of MRSTPFs, and their polishing performance on ring-shaped silicon carbide ceramic. The MRSTPFs were prepared by blending diamond particles, carbonyl iron particles, and a carrier fluid consisting of polyethylene glycol 200 and silicon dioxide. MRSTPFs with higher concentration of carrier fluid exhibited superior resistance to sedimentation. Specifically, the MRSTPFs with carrier fluid concentrations of 15 % and 20 % showed sedimentation ratios of 4 % and 2 %, respectively, after 49 days. The magnetic hysteresis loop of MRSTPFs revealed excellent magnetic stability and minimal hysteresis loss. The coercive force, remanence, and saturation magnetization were 6 Oe, 0.16 emu/g, and 43 emu/g, respectively. Furthermore, polishing experiments were conducted on ring-shaped silicon carbide ceramic using various polishing parameters, including feed rate, tool rotation speed, diamond particle size, and working gap. Under the optimal polishing parameters, the surface roughness was significantly reduced from 767 nm to 37 nm, indicating a remarkable improvement in surface quality. This study provides valuable insights into the fundamental characteristics of the MRSTPFs and highlights their significant potential for applications in ultra-precision polishing.
研究领域:
材料科学
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机械工程
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表面工程
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流变学
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磁性材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）