可切换润湿性超疏水表面制备方法及应用

目的 制备可切换润湿性的智能超疏水表面，并探索该表面潜在的应用前景。方法 利用模板法，基于热响应形状记忆聚合物（Shape Memory Polymer,SMP）制备具有条状微结构阵列的可切换润湿性智能超疏水表面，并对其润湿性可逆转换能力及循环使用稳定性进行测试。结果 通过扫描电子显微镜观察到所制备表面微结构完整且轮廓清晰，液滴接触角在该表面可达到（150±3）°。通过加热使该表面达到玻璃化转变温度，此时对其施加外载荷使表面上条状微结构向一侧倾倒，由于微结构形态的改变，SMP表面疏水性减弱、水黏附性增强，再通过简单加热就可以使表面形态恢复至原始状态。通过试验测得环氧SMP的形状固定率为98.8%、形状回复率为96.3%，均达到95%以上，由于其优异的形状记忆特性，条状微结构的形态可以在原始直立状态和受到外载荷时的倾倒状态之间产生热响应而自由转变，且这种润湿性转换循环10次以上后，该表面依然保持着相对良好的润湿性可逆转换能力。结论 基于形状记忆聚合物制备出的可切换润湿性智能超疏水表面具有良好的润湿性可逆转换能力和循环使用能力，且在液滴微反应器、生物检测、可重写液体图案、无损失液滴转移和芯...

Preparation Method and Application of Switchable Wettability Superhydrophobic Surface

Smart superhydrophobic surfaces with reversible wettability are attracting increasing attention. However, most of the reported wettability transitions of smart superhydrophobic surfaces are mainly made through reversible changing surface chemistry. There are few reports that the wettability of superhydrophobic surfaces can be changed reversibly by changing the surface microstructures, and the manufacturing of smart superhydrophobic surfaces with microstructure is still a great challenge. Due to shape memory polymer (SMP) and their composites have many advantages such as various driving modes, excellent shape recovery performance and mechanical properties, in this work, the template method was used to prepare switchable wettability smart superhydrophobic surface with strip microstructure arrays based on thermally responsive shape memory polymer and to explore the potential application prospect of the surface. And wettability reversible conversion ability and cycling stability were tested. Firstly, the aluminum template with strip microstructure arrays was fabricated by wire cutting. Secondly, the silica gel template was used as the intermediate template to prepare the smart superhydrophobic surface with strip microstructure arrays. The silica gel template can be used for many times during the preparation, and it was easy to demould during the preparation and could ensure the integrity of the surface microstructure arrays. By observing the smart superhydrophobic surface with a scanning electron microscope, it was found that its microstructures were intact and its contour was clear. The contact angle of droplets on this surface could reach (150±3)°.