DEVELOPMENT OF A SYSTEM FOR CHARACTERIZATION OF LINEAR AND NONLINEAR DIELECTRIC PROPERTY OF NANOMETRIC ORGANIC THIN FILM

纳米有机薄膜线性和非线性介电性能表征系统的开发

• 批准号: 09555095
• 负责人: IWAMOTO Mitsumasa
• 金额: $ 8.06万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555095/
• 关键词: Maxwell-displacement-current; Second Harmonic Generation; Dielectric Phenomena; Nonlinear Dielectrics; Organic monolayer; Liquid crystal; Order Parameter; relaxation time; Spectroscopy; 有機分子膜; 変位電流法; 理論解析; 誘電率; 双極子; 電気物性; 相転移; 非線型光学; 非線形光

The purpose of this investigation was to develop a measurement system used for the characterization of linear and nonlinear dielectric properties of organic monolayer films, and to measure Maxwell-displacement current (MDC) and Second Harmonics Generation (SHG) from monolayers on a water surface. Further to analyze monolayers based on a hardcore monolayer model was the purpose. Thus, this investigation has been carried out on the basis of the idea of Maxwell-displacement current measurement proposed by the investigators. The investigators analyzed the molecular motion of organic monolayer films using a rod-like polar molecular model, assuming the motion of molecules is ruled by the Boltzmann statistics. They theoretically derived dielectric relaxation time of monolayers and also analyzed the generation of MDC from chiral and achiral monolayers. They also analyzed the phase transition of monolayers and explained the chiral phase separation of mixed monolayers using a continuum theory. The relationship between the orientational order parameters, i.e., 1st 2nd and 3rd orientational order parameters, and the MDC and SHG signals were obtained. They also measured the MDC and SHG from 5CB liquid crystal monolayers. Further orientational transition process of LCs triggered by conformational change of azobenzene and the molecular motion of azobenzenes in mixed monolayer systems were analyzed based on a continuum theory, and the motion of LCs was discussed based on the simultaneous measurement of optical transmittance and the capacitanace.

本研究的目的是开发一种测量系统，用于表征有机单层薄膜的线性和非线性介电特性，并测量水面单层薄膜的麦克斯韦位移电流（MDC）和二次谐波产生（SHG）。目的是基于硬核单层模型进一步分析单层。因此，本研究是在研究人员提出的麦克斯韦位移电流测量思想的基础上进行的。研究人员使用棒状极性分子模型分析了有机单层薄膜的分子运动，假设分子的运动由玻尔兹曼统计数据决定。他们从理论上推导了单层的介电弛豫时间，并分析了手性和非手性单层 MDC 的生成。他们还分析了单层的相变，并使用连续介质理论解释了混合单层的手性相分离。获得了取向序参数（即第一、第二和第三取向序参数）与MDC和SHG信号之间的关系。他们还测量了 5CB 液晶单层的 MDC 和 SHG。基于连续介质理论分析了偶氮苯构象变化引发的液晶的进一步取向转变过程和混合单层体系中偶氮苯的分子运动，并基于光学透过率和电容的同时测量讨论了液晶的运动。

项目成果

Mitsumasa IWAMOTO, Chen-Xu WU, Yoshinobu MIZUTANI: "Analysis of thermally stimulated Maxwell-displacement current across organic monolayers"J. Appl. Phys.. 83. 4891-4896 (1998)

Mitsumasa IWAMOTO、Chen-Xu WU、Yoshinobu MIZUTANI：“有机单层热刺激麦克斯韦位移电流的分析”J。

M. Iwamoto, A. Sugimura and Z. C. Ou-yang: "The behavior of the Maxwell displacement current for a biaxial model of monolayers at the liquid-air interface"Chem. Phys. Lett.. 274. 505-512 (1997)

M. Iwamoto、A. Sugimura 和 Z. C. Ou-yang：“液-气界面处单分子层双轴模型的麦克斯韦位移电流的行为”Chem.

Yoko SATO, Chen-Xu WU, Yutaka MAJIMA and Mitsumasa IWAMOTO: "Determination of the piezoelectric coefficient of monolayers on water surface by Maxwell-displacement-current measurement"Jpn. J. Appl. Phys.. 37. 215-216 (1998)

Yoko SATO、Chen-Xu WU、Yutaka MAJIMA 和 Mitsumasa IWAMOTO：“通过麦克斯韦位移电流测量确定水面单层的压电系数”Jpn。

Wei Zhao, Chen-Xu, Mitsumasa IWAMOTO, Ou-Yang Zhong-can: "Modeling analysis of molecular chiral effect detected by Maxwell-displacement-current measurements"J. Chem. Phys.. 110. 12131-12140 (1999)

赵伟，徐晨，岩本光正，欧阳忠灿：“麦克斯韦位移电流测量检测分子手性效应的建模分析”。

Yoko Sato, Chen-Xu Wo, Yutaka Majima and Mitsumasa IWAMOTO: "Analysis of the Dielectric Relaxation Property of Phospholipid Monolayers by Maxwell Displacement Current Measurement"J. Colloid and Interface Science. 218. 118-121 (1999)

Yoko Sato、Chen-Xu Wo、Yutaka Majima 和 Mitsumasa IWAMOTO：“通过麦克斯韦位移电流测量分析磷脂单层的介电弛豫特性”J。