CAUTERIZATION OF DIELECTRIC PROPERTIES FOR MONOLAYERATAIR-WATER INTERFACE BY MEANS OF MAXWELL DISPLACEMENT CURRENT AND OPTICAL SECOND HARMONIC GENERATION MEASURMENT

麦克斯韦位移电流和光学二次谐波产生测量单层空气-水界面介电性能

• 批准号: 12450122
• 负责人: IWAMOTO Mitsumasa
• 金额: $ 7.3万
• 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: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450122/
• 关键词: Maxwell Displacement Current; Second Harmonic Generation; Dielectric Phenomena; Order Parameter; Organic monolayer; Liquid crystal; Langmuir-Blodgett Films; Phase Transition

The purpose of this investigation was to characterize the linear and nonlinear dielectric properties of organic monolayer films by means of Maxwell-displacement current (MDC) and optical Second Harmonics Generation (SHG) measurement. The macroscopic dielectric properties such as linear and nonlinear dielectric constants are strongly related to the orientational order parameters of the constituent molecules. From this point of view, this investigation has been carried out on the basis of the idea of MDC measurement coupled with SHG measurement, proposed by the investigators.The investigators measured MDC and SHG signals from the monolayer on the water surface of nCB and nOCB molecules, where they constructed a new measurement system using 532 (and 1064 nm) fundamental waves to gain the high SN ratio. Using the experimental results, they clarified the relationship between MDC and photoisomerization of azo-molecules based on the quantum chemical three-state model Furthermore they analyzed the phase transition occurring in phospholipid and liquid crystal monolayers using a continuum elastic-theory. They detected this kind of phase transitions in nOCB liquid crystalline monolayer. Finally they derived the theoretical relationship between the microscopic and macroscopic nonlinear susceptibilities in C_2 symmetry.

这项研究的目的是表征有机单层膜的线性和非线性介电特性，即Maxwell-Displacement电流（MDC）和光学第二次谐波（SHG）测量。宏观介电特性（例如线性和非线性介电常数）与组成分子的定向阶参数密切相关。从这个角度来看，该研究是根据研究人员提出的MDC测量和SHG测量的想法进行的。研究人员测量了NCB和NOCB分子水面上单层的MDC和SHG信号，他们使用532（和1064 nm）基本波构建了一个新的测量系统，以获得高SN比率。使用实验结果，他们阐明了基于量子化学三态模型的MDC与偶氮分子的光异构化之间的关系，他们还使用连续弹性理论分析了磷脂和液晶单层中发生的相变。他们检测到NOCB液晶单层中的这种相变。最后，他们得出了C_2对称性中的显微镜和宏观非线性敏感性之间的理论关系。

项目成果

Cheng Quan Li: "Analysis of Potential Distribution and Current-Voltage Characteristic in Polyimide Langmuir-Blodgett Films"Jpn. J. Appl. Phys.. 40. 4575-4580 (2001)

李成全：“聚酰亚胺Langmuir-Blodgett薄膜的电位分布和电流-电压特性分析”Jpn。

A. Tojima, Y. Matsuo, R. Hiyoshi, C. X. Wu, Y. Majima and M. Iwamoto: "Determination of Orientational Order Parameters of 4-Alkyl-4'-Cyanobiphenyl Monolayers at the Air-Water Interface by Maxwell-Displacement-Current and Second Harmonic Generation Measure

A. Tojima、Y. Matsuo、R. Hiyoshi、C. X. Wu、Y. Majima 和 M. Iwamoto：“通过麦克斯韦位移法测定空气-水界面 4-烷基-4-氰基联苯单层的取向有序参数-

渡嶋淳: "水面上単分子膜の変位電流と光第2次高調波の測定"電気学会論文誌A. 120-A. 1076-1080 (2000)

Jun Watshima：“水面上单层的位移电流和光学二次谐波的测量”日本电气工程师学会会刊 A. 120-1080 (2000)。

C. X. Wu, W. Zhao, M. Iwamoto, and Z. C. Ou-Yang: "Linear and nonlinear dielectric constant tensor for monolayers films in terms of orientational order parameters"J. Chem. Phys.. 112. 10548-10555 (2000)

C. X. Wu, W. Zhao, M. Iwamoto, and Z. C. Ou-Yang: “单层薄膜的线性和非线性介电常数张量的取向序参数”J.

M. Iwamoto, C. X. Wu and Z. C. Ou-Yang: "Second order susceptibility tensor of monolayer at the liquid-air interface : SHG spectroscopy by compression"Chem. Phys. Lett.. 325. 545-551 (2000)

M. Iwamoto、C. X. Wu 和 Z. C. Ou-Yang：“液-气界面单层的二阶磁化率张量：压缩 SHG 光谱”Chem.