A Comparative Study of Water- and Benzene-Saturated Mesoporous Silicas by $^{1}H$ NMR Spectroscopy

Ayyappan, S and Suryaprakash, N and Ramanathan, KV and Rao, CNR (1999) A Comparative Study of Water- and Benzene-Saturated Mesoporous Silicas by $^{1}H$ NMR Spectroscopy. In: Journal of Porous Materials, 6 (1). pp. 5-11.

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Abstract

H-1 NMR investigations have been carried out ion water- and benzene-saturated mesoporous sillicas with a wide range of pore sizes (13-42 Angstrom). The freezing point of the bound water increases with the pore size, approaching that of bulk water at large pore sizes. With large pore sizes, there is more than one transition due to the bound water species. The benzene-saturated samples show a behavior similar to that of water-saturated samples, although the freezing point depression is significantly greater. The pore size distribution generally becomes broader with the increase in pore size. The original Kelvin equation is satisfactory to estimate the pore radii both in the case of water and benzene-saturated samples.

Item Type:	Journal Article
Publication:	Journal of Porous Materials
Publisher:	Kluwer Academic
Additional Information:	Copyright of this article belongs to Kluwer Academic.
Keywords:	Mesoporous silica;Water in mesopores;Benzene in mesopores.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Chemical Sciences > Sophisticated Instruments Facility (Continued as NMR Research Centre)
Date Deposited:	02 Mar 2009 08:20
Last Modified:	19 Sep 2010 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/17729

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