title: Study of dielectric relaxations of anhydrous trehalose and maltose glasses.
abstract: We investigated the frequency dependent dielectric relaxation behaviors of anhydrous trehalose and maltose glasses in the temperature range which covers a supercooled and glassy states. In addition to the α-, Johari-Goldstein (JG) β-, and γ-relaxations in a typical glass forming system, we observed an extra relaxation process between JG β- and γ-relaxations in the dielectric loss spectra. We found that the unknown extra relaxation is a unique property of disaccharide which might originate from the intramolecular motion of flexible glycosidic bond. We also found that the temperature dependence of the JG β-relaxation time changes at 0.95T(g) and it might be universal.
authors.affiliation: Department of Nanomaterials Engineering & BK21 Nano Fusion Technology Division, Pusan National University, Miryang 627-706, Korea.
authors.forename: Hyun-Joung
authors.initials: HJ
authors.lastname: Kwon
authors.forename: Jeong-Ah
authors.initials: JA
authors.lastname: Seo
authors.forename: Hyung Kook
authors.initials: HK
authors.lastname: Kim
authors.forename: Yoon-Hwae
authors.initials: YH
authors.lastname: Hwang
mesh_terms: D005898:Glass / Q000737:chemistry; D008320:Maltose / Q000737:chemistry*; D013696:Temperature; D014199:Trehalose / Q000737:chemistry*
chemical_list: D008320:Maltose; D014199:Trehalose