ツクシ　イタル   TSUKUSHI Itaru   筑紫　格    所属   千葉工業大学  工学部 教育センター（工学部）    千葉工業大学  工学研究科 工学専攻    千葉工業大学  工学研究科 応用化学専攻    職種   教授
言語種別	英語
発行・発表の年月	2023/02
形態種別	学術雑誌
標題	Evaluation of the absolute configurational entropy of tri-O-methyl-β-cyclodextrin, a molecule with many degrees of freedom
執筆形態	共著
掲載誌名	Thermochimica Acta
掲載区分	国外
出版社・発行元	ELSEVIER
巻・号・頁	720,pp.179427
総ページ数	8
担当区分	責任著者
著者・共著者	Marika Yokota, Sota Goto, Itaru Tsukushi
概要	In this study, we evaluated the temperature dependence of the absolute configurational entropy of tri-O-methyl-β-cyclodextrin (TMCD), a molecule with many degrees of freedom. We calculated the configurational entropy from the configurational heat capacity obtained by subtracting the calculated heat capacity due to lattice vibrations and intramolecular vibrations from the heat capacity measured above the glass-transition temperature. We fitted the configurational heat capacity using both a power law and a logarithmic function based on Landau's critical-point theory. The configurational entropy increases more gradually as the temperature increases. We found that the temperature at which the configurational entropy vanishes (the so-called Kauzmann temperature TK) lies between 280 K and 298 K for TMCD. This is about 50 K lower than the glass-transition temperature of TMCD, which is consistent with the expectations.