Ye Xiangdong, Hou Junwen, Cai Dongbao
School of Mechanical and Electrical Engineering, Shaanxi Key Laboratory of Nano Materials and Technology, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Beilstein J Nanotechnol. 2019 Apr 10;10:840-847. doi: 10.3762/bjnano.10.84. eCollection 2019.
Reversibly switching wettability between superhydrophobicity and superhydrophilicity has attracted widespread interest because of its important applications. In this work, we propose a reversible superhydrophobic-superhydrophilic conversion induced by charge injection and heating. Different from the conventional electrowetting phenomenon caused by the accumulation of solid-liquid interfacial charges, we discovered a phenomenon where charge injection and accumulation at the solid surface results in a sharp increase in wettability. The wettability of a sprayed SiO nanoparticle coating on a glass slide was shown to change from superhydrophobic to superhydrophilic by charge injection and heating, and the superhydrophobicity was restored by heating, verifying a reversible superhydrophobic-superhydrophilic conversion. The influence of voltage, temperature, and time on the coating wettability and its durability under reversible conversion have been studied.
由于其重要应用，超疏水和超亲水之间的可逆润湿性切换引起了广泛关注。在这项工作中，我们提出了一种由电荷注入和加热诱导的可逆超疏水-超亲水转换。与由固液界面电荷积累引起的传统电润湿现象不同，我们发现了一种在固体表面电荷注入和积累导致润湿性急剧增加的现象。通过电荷注入和加热，玻璃载玻片上喷涂的SiO纳米颗粒涂层的润湿性从超疏水变为超亲水，通过加热恢复超疏水性，验证了可逆的超疏水-超亲水转换。研究了电压、温度和时间对涂层润湿性及其在可逆转换下的耐久性的影响。
