| 复合SiO2粒子涂膜表面结构及超疏水性能 |
| Effects of Dual-size Structure Formed by Composite Silica Particles on Wettability of Film Surface |
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| 摘要: 采用溶胶-凝胶法制备不同粒径SiO2粒子，通过表面改性得到不同形状复合粒子，并利用氟硅氧烷的表面自组装功能制备了具有“荷叶效应”的超疏水涂膜。通过原子力显微镜、扫描电镜和水接触角的测试对膜结构及性能进行了表征，探讨了SiO2粒子的粒径和形状与表面微观结构、表面粗糙度和表面疏水性能的关系。结果表明含单一粒径粒子涂膜表面水接触角符合Wenzel模型，而复合粒子构成了符合Cassie模型的非均相界面;单纯的粗糙度因子不能反映水接触角的变化，复合粒子在膜表面的无规则排列赋予涂膜表面不同等级的粗糙度，使得水滴与涂膜表面接触时能够形成高的空气捕捉率和较小的粗糙度因子;其与在涂膜表面能形成自组装分子膜的氟硅氧烷共同作用赋予了涂膜超疏水性能，而这种超疏水性能与复合粒子的粒径大小和形状基本无关。 |
| 关键词: 复合二氧化硅粒子 溶胶-凝胶法 双微观结构 超疏水 |
| 基金项目: |
| Abstract: Superhydrophobic surfaces originated from composite silica particles modified with fluorosiloxane were obtained. Different sizes of silica particles and fluorosiloxane were used for controlling surface morphology and chemistry， respectively. The dual size particles were obtained by utilizing the graft of different modified silica particles with epoxy functional group and amine functional group. This makes the surface of film formed a composite interface with irregular binary structure. The structure plays an essential role in trapping air between the substrate surface and the liquid droplets which is necessary for high contact angle and low contact angle hysteresis. The surface morphologies， roughness and the wettability on the surface of films containing different structural silica particles were compared. It is shown that the hierarchical irregularly structure with a low roughness factor and high air-trapped ratio makes superhydrophobic surface stable. The differences of shape and sizes of composite particles have little effect on hydrophobicity. The maximum contact angle for water on the hybrid film is about 174°±2° and the contact angle hysteresis is close to 0°. |
| Keywords: composite silica particle sol-gel method micro-nano-binary structure superhydrophobicity |
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| 曲爱兰,文秀芳,皮丕辉,程 江,杨卓如.复合SiO2粒子涂膜表面结构及超疏水性能[J].无机化学学报,2007,23(10):1711-1716. |
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