Dynamical Behaviour of H<suB>2</suB>O in Silica Gel

Chin. Phys. Lett.

2002, Vol. 19

Issue (5): 711-713 DOI:

Original Articles

Dynamical Behaviour of H₂O in Silica Gel

WANG Yan;DONG Shun-Le

Department of Physics, Ocean University of Qingdao, Qingdao 266003

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WANG Yan, DONG Shun-Le 2002 Chin. Phys. Lett. 19 711-713

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Abstract The vibrational spectra of silica gel with low concentrations of water, 3% and 10%, were studied with inelastic neutron scattering at 5 K. The experimental spectrum for 3% water in silica gel shows dramatic changes compared to the spectra for the other known ice phases in the energy transfer region of 2-140 meV. Its intermolecular librational band is shifted to lower energy by about 20 meV (or by a factor 1.43) compared to ice Ih, and shows a similar librational band with liquid at 290K. A significant excess of low frequency vibration modes (< 7meV) over normal ice Ih and very wide acoustic peak (4-15 meV) were observed. Experimental data indicate that little H₂O (3%) in silica gel exhibits a strong softening of hydrogen bonds compared to bulk normal ice and all the other known ice phases.

Keywords: 61.12.-q 63.20.Dj 61.43.-j

Published: 01 May 2002

PACS:	61.12.-q
	63.20.Dj
	61.43.-j	(Disordered solids)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2002/V19/I5/0711

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