Molecular mobility in supercooled trehalose

被引：61

作者：

De Gusseme, A ^{[1
]}

Carpentier, L ^{[1
]}

Willart, JF ^{[1
]}

Descamps, M ^{[1
]}

机构：

[1] Univ Sci & Tech Lille Flandres Artois, Lab Dynam & Struct Mat Mol, UMR 8024, F-59655 Villeneuve Dascq, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2003年 / 107卷 / 39期

关键词：

D O I：

10.1021/jp0343234

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The molecular mobility of amorphous anhydrous trehalose (C12H22O11) was investigated by means of temperature-modulated differential scanning calorimetry (TMDSC) and dielectric analysis (DEA). TMDSC was used to perform a specific heat spectroscopy, which appeared essential, as dielectric measurements above T-g were hampered by dc conductivity. TMDSC and DEA are useful complementary techniques for the study of the molecular mobility of this important bioprotecting agent. The study of the primary relaxation of trehalose, above the glass transition temperature, yielded the determination of the fragility index m and the stretching exponent beta. The correlation between m and beta was also discussed. Dielectric studies of the sub-T-g domain highlighted two distinct secondary relaxation processes, whose dynamical features were evaluated.

引用

页码：10879 / 10886

页数：8

共 44 条

[1] Relaxation in glassforming liquids and amorphous solids [J].