815 細線加熱法を用いた液晶レシチンの比熱測定

概要

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The developed specific heat measuring method using a transient hot wire has performed the specific heat characteristic of liquid crystal lecithin. The platinum wire of diameter 20[μm] was used as a heating element in liquid crystal. The length is about 15[mm]. Thermo-couple is connected to surface of platinum wire by utilizing solder, and measured direct temperature using it. Moreover, Visual Basic 6.0 was used for the analysis of specific heat. In a check experiment by Water, it was able to measure with the range of about 3% of relative error. As a result of performing specific heat measurement of lecithin by this method, it has changed the value before phase transition temperature (c=1.13[J/g・K]) and behind phase transition temperature (c=0.76[J/g・K]). This is close to the tendency of our measured thermal conductivity of previous reports.
2002-08-23