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.

通过使用电极作为传感器和各种光谱方法，通过电位计测定了溶液平衡。最近，在研究溶液平衡方面，已使用了在线控制的高精度量热法，其精确度高于电位测量法。我们已经开发了一个在线控制的量热法系统，并特别用于研究非水溶液中的金属离子络合。通常，电位计不能用于非水溶液中，因为溶剂中几乎不可用的电极可用。因此，精确的量热法可以扩大溶液化学研究领域的程度。为了理解溶液中的反应，对于简单的络合反应，量热法可能是需要的。因此，在这个项目中，我们尝试了一个电钙化法，这可能使我们提供有关电子转移或氧化还原反应的焓变的信息。这是我们测量由于电极反应而进化的热量的第一个试验，我们破坏了并制造了新的细胞进行测量。由于反应的热包括电子转移和络合的热量，因此在反应阶段进化的热是相关物种浓度的复杂功能，以及电子转移的量。因此，在目前阶段，测量热的分析尚未成功。我们将继续该项目，并建立分析方法，以提取有关电子传输的有用信息。