Determination of Orientatinal Order Parameters of 4-Alkyl-4′-Cyanobiphenyl Monolayers at the Air-Water Interface by Maxwell-Displacement-Current and Second Harmonic Generation Measurements
Determination of Orientatinal Order Parameters of 4-Alkyl-4′-Cyanobiphenyl Monolayers at the Air-Water Interface by Maxwell-Displacement-Current and Second Harmonic Generation Measurements
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通过麦克斯韦位移电流和二次谐波产生测量确定空气-水界面处 4-烷基-4′-氰基联苯单分子层的取向有序参数
DOI：
10.1080/10587250108028623
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Iwamoto
中科院分区：
文献类型：
--
作者：
A. Tojima;Y. Matsuo;Ryouhei Hiyoshi;Chen;Y. Majima;M. Iwamoto
摘要 使用麦克斯韦位移电流（MDC）和二次谐波产生（SHG）测量，可以检查材料表面有机单层薄膜的线性和非线性介电特性。在本研究中，我们开发了一种新颖的实验系统，可以检测MDC和SHG信号，并通过单层压缩检查4-氰基-4'-n-烷基联苯（5CB）在水面上的分子运动。成功地从MDC和SHG信号中确定了使用Legendre多项式表示的取向有序参数，并讨论了所确定的有序参数的差异与5CB单层分子运动的关系。
Abstract Using Maxwell displacement current (MDC) and second harmonic generation (SHG) measurements, the linear and nonlinear dielectric properties of organic monolayer films on a material surface can be examined. In this study, we have developed a novel experimental system which can detect MDC and SHG signals, and examined the molecular motion of 4-cyano-4′-n-alkyl-biphenyls (5CB) on the water surface by monolayer compression. The orientational order parameters expressed by using Legendre polynomials were successfully determined from both MDC and SHG signals, and the difference in the determined order parameters was discussed in association with the molecular motion of 5CB monolayers.