Hayashi Yamato, Yoshikawa Madoka, Shishido Tatsuya, Kudo Aya, Takizawa Hirotsugu
Graduate School of Engineering, Department of Applied Chemistry, Tohoku University, 6-6 Aoba, Aramaki, Aobaku, Sendai 980-8579, Japan.
Graduate School of Engineering, Department of Applied Chemistry, Tohoku University, 6-6 Aoba, Aramaki, Aobaku, Sendai 980-8579, Japan.
Ultrason Sonochem. 2025 Aug 4;120:107496. doi: 10.1016/j.ultsonch.2025.107496.
In this study, a composite material consisting of silicone rubber and silver (Ag) nanoparticles was fabricated using a sonochemical approach. By irradiating silver oxide (AgO) and silicone rubber in ethanol, a functionally graded material (FGM) was synthesized, in which Ag nanoparticles were incorporated on the surface and interior of the silicone rubber. The structure of the FGM had a smaller composition of Ag nanoparticles from the surface to the inside of the silicone rubber, which changed continuously. This compositional gradient improved the heat resistance of silicone rubber by about 30°C. Although this gradient material had an extremely small Ag loading amount of about 0.5 mg/cm per unit area of silicone rubber, this material exhibited good conductivity (under 10 Ω･cm). Notably, this material can be easily fabricated using ultrasonic irradiation. Due to cavitation effects, even at room temperature and atmospheric pressure, chemical reactions for this FGM between the solvents and solutes occurred. This reaction requires only AgO, silicone rubber, and ethanol as raw materials, and the only byproduct is O. Therefore, this sonochemical process is simple and sustainable, as the product can be obtained cost effectively and environmentally friendly.
在本研究中，采用声化学方法制备了一种由硅橡胶和银（Ag）纳米颗粒组成的复合材料。通过在乙醇中辐照氧化银（AgO）和硅橡胶，合成了一种功能梯度材料（FGM），其中Ag纳米颗粒掺入到硅橡胶的表面和内部。FGM的结构从硅橡胶表面到内部Ag纳米颗粒的组成逐渐减小，且连续变化。这种成分梯度使硅橡胶的耐热性提高了约30°C。尽管这种梯度材料每单位面积硅橡胶的Ag负载量极小，约为0.5 mg/cm，但该材料仍表现出良好的导电性（低于10 Ω･cm）。值得注意的是，使用超声辐照可以轻松制备这种材料。由于空化效应，即使在室温及大气压下，溶剂和溶质之间也会发生针对这种FGM的化学反应。该反应仅需AgO、硅橡胶和乙醇作为原料，唯一的副产物是O。因此，这种声化学过程简单且可持续，因为可以经济高效且环保地获得产物。
