Delicate Modification of Poly(dimethylsiloxane) Ultrathin Film by Low-Energy Ion Beam Treatment for Durable Intermediate Liquid Crystal Pretilt Angles

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• 作者：Byoung Har Hwang ; Chu Ji Choi ; Min Kyoung Jo ; Jong Bok Kim ; Hae Min Choe ; Soo Sang Chae ; Youn Sang Kim ; Hong Koo Baik
• 刊名：Langmuir
• 出版年：2010
• 出版时间：April 6, 2010
• 年：2010
• 卷：26
• 期：7
• 页码：5072-5076
• 全文大小：799K
• 年卷期：v.26,no.7(April 6, 2010)
• ISSN：1520-5827

文摘

Long-term stability of intermediate liquid crystal pretilt angles on a poly(dimethylsiloxane) (PDMS) ultrathin film grafted onto a surface was realized simply and easily via low-energy ion beam (IB) treatment. The composition and surface energy of the thin film could be controlled by varying the low-energy IB treatment. This treatment results in the permanent chemical modification of the film surface, converting it from organic PDMS to a mixed layer of organic PDMS and inorganic silica. The partial transformation of a PDMS surface gives rise to the control of the pretilt angle via the formation of the inhomogeneous surface and the stabilization of the pretilt angle via the cross-linking reaction of broken chemical bonds through IB irradiation. As a result, a continuous variation of pretilt angles that maintained their initial value with long-term stability was obtained. Thus, the unique chemical transformation of the PDMS surface using IB treatment may allow for the production of durable intermediate liquid crystal pretilt angles.