|Thompson H, Soper AK, Ricci MA, Bruni F, Skipper NT. The three-dimensional structure of water confined in nanoporous vycor glass. J Phys Chem B. 2007 May 24111(20):5610-20.PubMed ID17472364
|a well characterized vycor glass, which contains a random network of pores of diameter 40 ± 5 Å^2 was studied. The structure of vycor is similar to bulk silica glass, with silicon atoms 4-fold coordinated to oxygen atoms. The surface of the pore is hydrophilic, consisting of acidic OH groups. As a result, water interacts strongly with the substrate surface, and both the thermodynamics and molecular motions are significantly different from those in the bulk.
|There is an appreciable decrease in the hydrogen-bonding upon confinement, irrespective of pore shape. In confinement only ~2.2 hydrogen bonds per water molecule are formed