کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5408338 | 1506530 | 2017 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molecular dynamics of 4-propyl-4â²-thiocyanatobiphenyl (3BT) in the strong glass-forming smectic E phase
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Broadband dielectric spectroscopy was employed to study glass transition dynamics in highly ordered smectic E phase of 4-propyl-4â²-thiocyanato-1,1â²-biphenyl (3BT). Three relaxation processes exhibiting Arrhenius-like thermal activation were detected: (1) δ-relaxation assigned to molecular reorientation around the short axis, (2) α-relaxation attributed to rigid molecular cores tumbling around the long axis and (3) secondary β-relaxation. Our investigations revealed that the smectic E phase (SmE) is a strong glass-former with the smallest possible fragility index mf ~ 16. Finally, an analysis of loss spectra (εâ³(f)) in terms of their shape parameters (1 â m) and n demonstrated long and short range coupling between molecular motions in the glassy state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 241, September 2017, Pages 355-358
Journal: Journal of Molecular Liquids - Volume 241, September 2017, Pages 355-358
نویسندگان
MaÅgorzata Jasiurkowska-Delaporte, Maria Massalska-Arodź,