Abstract
In order to clarify the origin of the hysteresis between freezing and melting of pore water, we performed x-ray diffraction measurements of water confined inside the cylindrical pores of seven kinds of siliceous MCM-41 (a member of ordered mesoporous materials denoted by Mobil Oil researchers) with different pore radii (1.2–2.9 nm) and the interconnected pores of Vycor glass as a function of temperature. The hysteresis effect depends markedly on the size of the cylindrical pores: the hysteresis is negligibly small in smaller pores and becomes remarkable in larger pores. This strongly suggests that the hysteresis is arisen from size-dependent supercooling of water confined to the mesopores. For the water confined to the mesopores with pore radius of 1.2 nm, a continuous transition between a liquid and a solid precedes the first-order freezing transition of the pore water which would occur by the same mechanism as in bulk water.
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Dates
| Type | When |
|---|---|
| Created | 23 years ago (July 26, 2002, 8:17 a.m.) |
| Deposited | 1 year, 6 months ago (Feb. 7, 2024, 10:28 a.m.) |
| Indexed | 3 weeks, 6 days ago (July 25, 2025, 6:53 a.m.) |
| Issued | 26 years, 5 months ago (March 8, 1999) |
| Published | 26 years, 5 months ago (March 8, 1999) |
| Published Print | 26 years, 5 months ago (March 8, 1999) |
@article{Morishige_1999, title={Freezing and melting of water in a single cylindrical pore: The pore-size dependence of freezing and melting behavior}, volume={110}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.478372}, DOI={10.1063/1.478372}, number={10}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Morishige, Kunimitsu and Kawano, Keiji}, year={1999}, month=mar, pages={4867–4872} }