Preparation of Janus Titanium Mesh for the Transport of Water Droplet and Air Bubble by Electrochemical Etching

【作者】 张世明； 刘明琳； 陈慧芳； 张裕平；

【机构】 河南科技学院化学化工学院； 郑州大学化学学院；

【摘要】 In recent years, porous smart membrane materials with one-way transportation have been widely used in various fields such as sewage treatment, oil/water separation and so on. However,there have been few materials that can intelligently transport bubbles and liquids simultaneously.Herein, an electrochemical etching method is used for the titanium mesh to create the necessary roughness with enough micro/nano structures. A superamphiphobic surface is formed after the etched mesh being immersed in the ethanol solution of 1 H,1 H,2 H,2 H-perfluorooctyl trichlorosilane(1%,v/v) as the low surface energy material. Due to the photosensitivity of titanium dioxide, the resulted mesh presents one-way transmission after Uv irradiation. We can change different Uv irradiation time for the control of liquid droplet penetration with different surface tensions. With increasing the UV irradiation time, the surface energy of the UV-irradiated surface increased, leading to the spreading of liquids with higher surface tension on the UV-irradiated side.With fine-tuning the UV irradiation time, a series of meshes that showed one-way transport feature for liquids with different surface tension ranges were prepared. Moreover, the use of titanium mesh exposed for more than 7 hours can carry out one-way transmission of bubbles under water. This smart material may promote the development of advanced materials for the effective separation of liquid/liquid and liquid/air.更多还原

【Abstract】 In recent years, porous smart membrane materials with one-way transportation have been widely used in various fields such as sewage treatment, oil/water separation and so on. However,there have been few materials that can intelligently transport bubbles and liquids simultaneously.Herein, an electrochemical etching method is used for the titanium mesh to create the necessary roughness with enough micro/nano structures. A superamphiphobic surface is formed after the etched mesh being immersed in the ethanol solution of 1 H,1 H,2 H,2 H-perfluorooctyl trichlorosilane(1%,v/v) as the low surface energy material. Due to the photosensitivity of titanium dioxide, the resulted mesh presents one-way transmission after Uv irradiation. We can change different Uv irradiation time for the control of liquid droplet penetration with different surface tensions. With increasing the UV irradiation time, the surface energy of the UV-irradiated surface increased, leading to the spreading of liquids with higher surface tension on the UV-irradiated side.With fine-tuning the UV irradiation time, a series of meshes that showed one-way transport feature for liquids with different surface tension ranges were prepared. Moreover, the use of titanium mesh exposed for more than 7 hours can carry out one-way transmission of bubbles under water. This smart material may promote the development of advanced materials for the effective separation of liquid/liquid and liquid/air.更多还原