Study of glassy and crystal ethanol by broadband nuclear magnetic resonance (CROSBI ID 580161)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Cvitanić, Tonči ; Sudić, Ivan ; Požek, Miroslav ; Kveder, Marina
engleski
Study of glassy and crystal ethanol by broadband nuclear magnetic resonance
Deuterated ethanol (C2D5OD) was studied by means of broadband nuclear magnetic resonance at fields up to 12 T. Ethanol is used as an ideal model system for properties of glassy states. By varying temperature (30 K - 160K) and thermal history of the sample two stable solid states were achieved - crystalline ethanol and ethanol glass. Difference between these two states was verified by T1 relaxation measurements, which are at least an order of magnitude longer in crystal than in glass. Relaxation time measurements are in agreement with known results from the literature [1]. In addition, here presented experimental data was measured in broader temperature range and, for the first time, at higher frequencies. Spectrometric measurements do not show any distinction between crystaline and glassy state, however, they do provide insight into the dynamics of methyl groups. Rotations of methyl groups are showed to be suppressed below 120 K and activated above 125 K. Activation of rotational degrees of freedom at relatively high temperatures implies methyl group confinement within ethanol crystal structure in both solid states investigated. [1] T. Eguchi, G. Soda, and H. Chihara, Molecular Physics 40, 681 (1980).
D-ethanol ; glass ; nuclear magnetic resonance
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Podaci o prilogu
41-41.
2011.
objavljeno
Podaci o matičnoj publikaciji
Abstract book: 2nd workshop on Recent advances in broadband solid state NMR of correlated electronic systems
Mendels, Philipe ; Carreta, Pietro ; Grafe, Hans-Joachim ; Barišić, Slaven
Zagreb:
Podaci o skupu
2nd workshop on Recent advances in broadband solid state NMR of correlated electronic systems
poster
04.09.2011-10.09.2011
Trogir, Hrvatska