DEVELOPMENT OF AN ELECTROCALORIMETRY SYSTEM

电量热系统的开发

基本信息

批准号：
08554032
负责人：
ISHIGURO Shin-ichi
金额：
$ 0.83万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08554032/
关键词：
Calorimetry Electrode Reaction Electrocalorimety Enthalpy

项目摘要

Solution equilibria have been studied by potentiometry using an electrode as a sensor and by various spectroscopic methods. Recently, an on-line controlled high-precision calorimetry, with precision as high as that of potentiometry, has been used studying solution equilibria. We have developed an on-line controlled calorimetry system, and used it particularly for studying metal-ion complexation in nonaqueous solution. In general, potentiometry cannot be used in nonaqueous solutions, as suitable electrodes are hardly available in the solvent. Precise calorimetry can therefore expand the extent of research area of solution chemistry. In order to understand reactions in solution, calorimetry other than that for simple complexation reaction may be necessary. Therefore, in this project, we tried an electrocalorimetry, which may afford us information on the enthalpy change of an electron transfer or redox reaction. This is our first trial for measuring the heat evolved due to electrode reactions, and we disigned and made new cells for the measurements. As a heat of reaction is consisted of heats of both electron transfer and complexation, a heat evolved at a reaction stage is a complicated function of concentrations of related species, and the amount of electron transfer. Therefore, the analysis of measured heat is not successful at the present stage. We will continue this project and establish the method of analysis to extract useful information on electron transfer.

溶液平衡已通过使用电极作为传感器的电位测定法和各种光谱方法进行了研究。最近，精度与电位计一样高的在线控制高精度量热法已被用于研究溶液平衡。我们开发了一种在线控制量热系统，专门用于研究非水溶液中的金属离子络合。一般来说，电位测定法不能在非水溶液中使用，因为在溶剂中很难找到合适的电极。因此，精确的量热法可以扩大溶液化学的研究范围。为了了解溶液中的反应，除了简单络合反应之外，可能还需要量热法。因此，在这个项目中，我们尝试了电量热法，它可以为我们提供有关电子转移或氧化还原反应的焓变的信息。这是我们第一次尝试测量电极反应产生的热量，我们设计并制造了新的测量单元。由于反应热由电子转移热和络合热组成，因此反应阶段放出的热量是相关物质浓度和电子转移量的复杂函数。因此，现阶段对实测热量的分析并不成功。我们将继续该项目并建立分析方法以提取有关电子转移的有用信息。