Boojum and Stripe Textures in Long-Range Orientationally Ordered Monolayers on Solid Substrates

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• 作者：Wenlang Liang ; Tanmay Bera ; Xuejun Zhang ; Andre J. Gesquiere ; Jiyu Fang
• 刊名：Langmuir
• 出版年：2011
• 出版时间：February 1, 2011
• 年：2011
• 卷：27
• 期：3
• 页码：1051-1055
• 全文大小：851K
• 年卷期：v.27,no.3(February 1, 2011)
• ISSN：1520-5827

文摘

Long-range organization of molecular tilt azimuth is a striking feature in monolayers at the air鈭抴ater interface. We show that the boojum and stripe textures of pentadecanoic acid (PDA) with the continuous variations of molecular tilt azimuth formed at the air鈭抴ater interface at temperatures lower than room temperature can be preserved after being transferred to glass substrates at low dipping speeds. The long-range tilt order in the transferred boojums and stripes is resolved by frictional force microscopy at room temperature, suggesting that the tilt order is 鈥渇rozen鈥?through the interaction of PDA molecules with the glass surface. The transferred stripe structure can be used as a unique alignment layer to induce a continuously azimuthal orientation of nematic liquid crystals.