X線回折-示差熱同時測定

概要

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In studying phase transition of fats and fatty compounds, a simultaneous measurement of X-ray diffraction and DTA is desirable. For such a purpose, a simple devise was designed in the -180°C+200°C range by modifying a low temperature X-ray diffractmeter attachment. Fig.-1 and Fig.-2 show outlines of this devise. <BR>With this devise, ammonium nitrate (Fig.-3), triglycerides, such as trilaurin (Fig.-4 E1), trimyristin (Fig.-4 E2), tripalmitin (Fig.-4 E3) and potassium laurate (Fig.-6, Fig.-7) were examined. Change in X-ray diffraction pattern coincided with DTA data. Even a small amount of heat of the transi-tion of ammonium nitrate (-16°C, 0.130 kcal/mol) was detected. <BR>It is expected that the transition accompanied with a hysteresis phenomenon will be successfully observed by this devise, because X-ray diffraction and DTA can be measured under entirely identical conditions.
社団法人日本油化学会の論文