Development of the 2-Dimensional Quasielastic Light Scattering Spectrometer

二维准弹性光散射光谱仪的研制

• 批准号: 05555021
• 负责人: HAYAKAWA Reinosuke
• 金额: $ 5.63万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555021/
• 关键词: Quasielastic Light Scattering; Electrophoretic Mobility; 2-Dimensional Spectroscopy; Periodically Stationary System; Diffusion Constant; Quasielastic Light Scattering; Electrophoretic Mobility; 2-Dimensional Spectroscopy; Periodically Stationary System; Diffusion Constant

The purpose of this research project is to develop a 2-dimensional quasielastic light scattering (2D-QELS) spectrometer, which enables us to obtain detailed information on the microscopic fluctuation of various materials. The measurement method for 2D-QELS is based on a different technique producing 2-dimensional (2D) spectra from other 2D spectroscopies such as 2D-NMR and IR.In 1993, we assembled the 2D-QELS spectrometer which consisted of a laser, a high-voltage sinusoidal wave generator, a cell with parallel-plate electrodes, an optical mixing system in the heterodyne mode, and a detector unit with a photomultiplier and a photon counter. And some perparatory measurements for 2D-QELS were performed by using a simpler system with a photodiode and an A/D converter. In 1994, we made an interface unit between the 2D-QELS spectrometer and a personal computer, and incorporated a software program based on an extended Wiener-Khinchin theorem, which enabled us to obtain the 2D spectra directly from the scattered light intensity without calculating the autocorrelation function. Then the 2D-QELS spectrometer completed was applied to standard samples such as a polystirene latex and polystirene sulfonate in aqueous solutions. As a result, it was found that we could measure the phase delta of the complex electrophoretic mobility mu^*=muexp (idelta), which was unobtainable by the conventional method, determine the value of the amplitude mu more acculately, and detect the apparent diffusion constant D_<app> in the frequency range wider than the conventional method. The new measurement method used in 2D-QELS is expected to be applicable to the time-dependent flucuations on various kinds of periodically stationary systems.

该研究项目的目的是开发二维准磁光散射（2D-QELS）光谱仪，这使我们能够获得有关各种材料微观波动的详细信息。 2D-QELS的测量方法基于一种不同的技术，该技术从其他2D光谱中产生2维（2D）光谱，例如2D-NMR和IR.IN 1993，我们组装了2D-QELS光谱仪，该光谱仪由激光组成，由激光组成，由一个高电量的正弦波生成器，一个和平行的模式组成的组成的组合，并平行模式和平行的模式，并将其组合为单位，并将其组合出来。带有光电倍增子和光子计数器的检测单元。并使用具有光电二极管和A/D转换器的较简单系统对2D-QEL进行了一些透明测量。 1994年，我们在2D-QELS光谱仪和个人计算机之间建立了一个接口单元，并根据扩展的Wiener-khinchin定理合并了一个软件程序，这使我们能够直接从散射的光强度直接获得2D光谱，而无需计算自相关功能。然后将完成的2D-QEL光谱仪应用于水溶液中的标准样品，例如聚苯乙烯乳胶和聚苯乙烯。结果，发现我们可以测量复杂的电泳迁移率mu^*= muexp（idelta）的相位三角洲，而传统方法无法实现，它可以更耐用地确定振幅MU的值，并检测到明显的扩散常数d_ app>在频率范围内的频率更高。 2D-QEL中使用的新测量方法预计将适用于各种定期固定系统的时间依赖性逆转。