Quasi-elastic neutron scattering study on polymorphism of tristearin: relationship between dynamical properties and subcell structures

被引：6

作者：

Akita, Chikayo ^{[1
]}

Kawaguchi, Tatsuya ^{[1
]}

Kaneko, Fumitoshi ^{[1
]}

Yamamuro, Osamu ^{[2
]}

Akita, Hiroyuki ^{[3
]}

Ono, Machiko ^{[3
]}

Suzuki, Masao ^{[4
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Osaka 5600043, Japan

[2] Univ Tokyo, Inst Solid State Phys, Tokai, Ibaraki 3191106, Japan

[3] Toho Univ, Sch Pharmaceut Sci, Funabashi, Chiba 2478510, Japan

[4] Res Inst Biol Mat, Nara 6392154, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2005年 / 275卷 / 1-2期

关键词：

Biomaterials; Lipids; Organic compounds;

D O I：

10.1016/j.jcrysgro.2004.11.243

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Dynamical properties of the three polymorphic phases alpha, beta' and beta of tristearin [C3H5(OCOC17H35)(3)] have been studied by incoherent quasi-elastic neutron scatteringand X-ray diffraction. At 293 K the difference in the lateral packing density of hydrocarbon chains significantly affected the mean square displacement < U-2 >. As compared with beta, an increase by 4% in the cross-sectional area for beta' resulted in a twofold increase in < U-2 >. In case of alpha, an increase by 7% led to a threefold increase in < U-2 >. The molecular motion in the alpha phase was analyzed usingthe model of the uniaxial rotational diffusion in a onefold cosine potential. It has been clarified that the rotational fluctuation about the chain axis in the alpha phase is rather restricted compared with that in the rotator phase of n-alkanes. The < U-2 > in the alpha phase decreased significantly with the temperature, and reached the level of the < U-2 > in the beta phase at 193 K. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：E2187 / E2193

页数：7

共 18 条

[1] Total synthesis of (+)-macrosphelides A, C, E, F, and G based on enzymatic function [J].