National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, People's Republic of China.
Langmuir. 2021 Dec 21;37(50):14668-14678. doi: 10.1021/acs.langmuir.1c02398. Epub 2021 Dec 8.
In this study, a series of microsphere composites were prepared by the hydrosilylation of nanospherical SiO and silicon rubber microspheres. The influence of different host-guest size ratios on the wettability of the SiO/silicone rubber composite microspheres was explored. The structures and performance of the composite microspheres were investigated using scanning electron microscopy and contact angle testing. The results showed that the prepared SiO/silicone rubber composite microspheres had a raspberry-like structure and exhibited a rose petal effect. When the SiO content was 30%, the water contact angle of the SiO/silicone rubber composite microspheres reached a maximum, and 30% was used as the optimal ratio for compounding SiO having different particle diameters with silicone rubber microspheres. Wettability calculations and analyses were performed for the surface with the composite microspheres. The results indicated that the structure with dual-size roughness could significantly improve surface hydrophobicity. As the ratio of the host-guest size increased, the contact angle of the water phase also increased. However, the surface structures of the composite microspheres were not uniform because of the surface chemical composition and the uncontrollable distribution of the small spheres on the surface of the large spheres during compounding. As a result, water droplets appeared in the Cassie-impregnated state on the composite microsphere particle coating, resulting in the phenomenon of high hydrophobicity and high adhesion.
在这项研究中，通过纳米球形 SiO2 和硅橡胶微球的硅氢加成反应制备了一系列微球复合材料。探讨了不同主客体尺寸比对 SiO2/硅橡胶复合微球润湿性的影响。通过扫描电子显微镜和接触角测试研究了复合微球的结构和性能。结果表明，所制备的 SiO2/硅橡胶复合微球具有覆盆子状结构，并表现出玫瑰花瓣效应。当 SiO2 含量为 30%时，SiO2/硅橡胶复合微球的水接触角达到最大值，30%被用作与硅橡胶微球复合时具有不同粒径的 SiO2 的最佳复合比。对具有复合微球的表面进行了润湿性计算和分析。结果表明，双尺寸粗糙度结构可以显著提高表面疏水性。随着主客体尺寸比的增加，水相的接触角也增加。然而，由于表面化学成分以及在复合过程中小球在大球表面的不可控分布，复合微球的表面结构不均匀。结果，在复合微球颗粒涂层上，水滴呈现出 Cassie 浸渍状态，导致高疏水性和高附着力现象。
