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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