Jelassi, Jahwar, Castricum, Hessel L., Bellissent-Funel, Marie-Claire, Dore, John C., Webber, J. Beau W., Sridi-Dorbez, Rachida (2010) Studies of water and ice in hydrophilic and hydrophobic mesoporous silicas: pore characterisation and phase transformations. Physical Chemistry Chemical Physics, 12 . pp. 2838-2849. ISSN 1463-9076. (doi:10.1039/b908400b) (KAR id:25820)
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Official URL: http://dx.doi.org/10.1039/b908400b |
Abstract
A study has been made as a function of temperature of the phase transformation of water and ice
in two samples of mesoporous silica gel with pore diameters of B50 A ? . One sample was modified
by coating with a layer of trimethylchlorosilane, giving a predominantly hydrophobic internal
surface, whereas the unmodified sample has a hydrophilic interface. The pore structure was
characterised by nitrogen gas adsorption and NMR cryoporometry and the melting/freezing
behaviour of water and ice in the pores was studied by DSC and neutron diffraction for cooling
and heating cycles, covering a range of 200 to 300 K. Measurements were made for several
filling-factors in the range 0.2 to 0.9. The results show a systematic difference in the form of ice
created in each of the samples. The non-modified sample gives similar results to previous studies
with hydrophilic silicas, exhibiting a defective form of cubic ice superimposed on a more
disordered pattern that changes with temperature and has been characterised as ‘plastic’ ice
[Liu et al., 2006, Webber et al., 2007]. The modified sample has similar general features but displays
important variability in the ice transformation features, particularly for the case of the low
filling-factor (f = 0.2). The results exhibit a complex temperature-dependent variation of the
crystalline and disordered components that are substantially altered for the different filling-factors.
Item Type: | Article |
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DOI/Identification number: | 10.1039/b908400b |
Subjects: | Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Depositing User: | J.B.W. Webber |
Date Deposited: | 26 Oct 2010 13:51 UTC |
Last Modified: | 10 Jan 2024 10:50 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/25820 (The current URI for this page, for reference purposes) |
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