کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5390075 1505083 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elastic properties of aspirin in its crystalline and glassy phases studied by micro-Brillouin scattering
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Elastic properties of aspirin in its crystalline and glassy phases studied by micro-Brillouin scattering
چکیده انگلیسی

The acoustic waves propagating along the direction perpendicular to the (1 0 0) cleavage plane of aspirin crystal were investigated using micro-Brillouin spectroscopy from which C11, C55 and C66 were obtained. The temperature dependence of the longitudinal acoustic waves could be explained by normal anharmonic lattice models, while the transverse acoustic waves showed an abnormal increase in the hypersonic attenuation at low temperatures indicating their coupling to local remnant dynamics. The sound velocity as well as the attenuation of the longitudinal acoustic waves of glassy aspirin showed a substantial change at ∼235 K confirming a transition from glassy to supercooled liquid state in vitreous aspirin.

Brillouin scattering spectrum of aspirin in its crystal and glassy phases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics Letters - Volume 465, Issues 1–3, 3 November 2008, Pages 36-39
نویسندگان
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