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Photo‐Tunable Supramolecular Ultrathin Surfaces for Simultaneous Homeotropic Anchoring and Superfast Switching of Liquid Crystals
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2019-11-22 , DOI: 10.1002/macp.201900411
Intae Son 1 , Chunho Kim 1 , Gitae Moon 1 , Jun Hyup Lee 1
Affiliation  

Photo‐tunable supramolecular ultrathin surfaces functionalized with a soft ultraviolet (UV) treatment of star‐shaped reactive amphiphiles are fabricated to simultaneously afford homeotropic anchoring of liquid crystals (LCs) and improve the LC switching performance. Photochemically functionalized ultrathin surfaces are generated by cross‐linking star‐shaped amphiphilic monomers in the self‐assembled monolayers with retention of cluster structure under electric field. Since these star‐shaped amphiphiles can construct the close‐packed self‐organized molecular layer with an alkyl brush at the interface between indium tin oxide and LCs through intermolecular hydrogen bonding, they might make elegant alignment surfaces for the homeotropic anchoring of LCs to provide a new type of vertical alignment layer. It is experimentally revealed that supramolecular ultrathin layers with vertical nanopillars form hydrophobic surface, and afford a stable and uniform homeotropic alignment of LCs even in high‐temperature environment. Furthermore, a soft UV irradiation on the self‐assembled ultrathin surfaces under electric field yields superfast responsive cross‐linked ultrathin surfaces with low power consumption compared to conventional polyimide layer. Notably, this controlled methodology offers advantages of simplicity, low‐cost, and scalability in the fabrication of functional alignment surfaces without the need of complex manufacturing steps.

中文翻译:

可光调谐的超分子超薄表面,可同时进行垂直各向同性锚固和超快切换液晶

通过对星形反应性两亲物进行软紫外线(UV)处理而功能化的光可调超分子超薄表面,可同时提供液晶(LC)的垂直同质锚定并改善LC切换性能。光化学功能化的超薄表面是通过在自组装单层中交联星形两亲性单体并在电场作用下保留簇结构而生成的。由于这些星状两亲物可以通过分子间氢键在氧化铟锡和LC之间的界面上用烷基刷构成密排的自组织分子层,因此它们可以为LC的垂直排列提供优雅的排列表面,从而提供LC新型的垂直对齐层。实验表明,具有垂直纳米柱的超分子超薄层形成疏水表面,即使在高温环境下也能使LC保持稳定且均匀的垂直排列。此外,与常规聚酰亚胺层相比,在电场作用下在自组装超薄表面上进行柔和的紫外线照射,可产生超快速响应的交联超薄表面,且功耗低。值得注意的是,这种受控方法在功能对准表面的制造中具有简单,低成本和可扩展性的优点,而无需复杂的制造步骤。与常规聚酰亚胺层相比,在电场作用下在自组装超薄表面上进行柔和的紫外线照射可产生超快响应的交联超薄表面,且功耗低。值得注意的是,这种受控方法在功能对准表面的制造中具有简单,低成本和可扩展性的优点,而无需复杂的制造步骤。与常规聚酰亚胺层相比,在电场作用下在自组装超薄表面上进行柔和的紫外线照射可产生超快响应的交联超薄表面,且功耗低。值得注意的是,这种受控方法在功能对准表面的制造中具有简单,低成本和可扩展性的优点,而无需复杂的制造步骤。
更新日期:2019-11-22
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