Lateral Flow through a Parallel Gap Driven by Surface Hydrophilicity and Liquid Edge Pinning for Creating Microlens Array

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• 作者：Chengbao Jiang ; Xiangming Li ; Hongmiao Tian ; Chunhui Wang ; Jinyou Shao ; Yucheng Ding ; Li Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 12, 2014
• 年：2014
• 卷：6
• 期：21
• 页码：18450-18456
• 全文大小：427K
• ISSN：1944-8252

文摘

This letter proposes a surface-energy driven process for economically creating polymer microlens array (MLA) with well controllable curvatures. When a UV-curable prepolymer flows into a cell constructed by multiple holes on a top template and a flat substrate, since the edge pinning of the contact line, an array of curved air/prepolymer interface forms around each microhole of the template. Then a UV-radiation of the bulk prepolymer leads to a solid microlens array. The curvature of the air/prepolymer interface can be controlled by choosing materials with different interface free energy or varying the gap height mechanically.

Keywords:

microlens array; surface energy; hydrophilicity; liquid pinning; micromolding