Relation between the Spontaneous Polarization and Alkyl Chain Length in Ferroelectric Switching of Columnar Liquid-Crystalline Ureas
作者:Keiki Kishikawa、Shoichiro Nakahara、Masanori Natsukawa、Keiichi Suzuki、Shigeo Kohmoto
DOI:10.1080/15421400903400795
日期:2010.2.5
Relation between the spontaneous polarization and alkyl chain length was investigated in ferroelectric switching of N,N′-bis(3,4,5-trialkoxyphenyl)urea (1-7) possessing n-C4H9, n-C8H17, n-C9H19, n-C10H21, n-C11H23, n-C12H25, and n-C16H33, respectively. The phase behaviors were investigated by differential scanning calorimetry, polarized optical microscopy, and the column diameters were obtained by
在具有 n-C4H9、n-C8H17、n-C9H19、n 的 N,N'-双(3,4,5-三烷氧基苯基)脲 (1-7) 的铁电转换中研究了自发极化与烷基链长度之间的关系分别为 -C10H21、n-C11H23、n-C12H25 和 n-C16H33。通过差示扫描量热法、偏光显微镜研究相行为,并通过X射线衍射获得柱直径。化合物2-7表现出矩形和六边形柱状相。所有六方柱状相都在三角波电压下表现出铁电切换。从自发极化与烷基链的碳原子数的关系图可以看出它们之间的相关性,并强烈表明切换电流峰值源于极性柱的切换,