Abstract
A sensitive electrolytic technique suitable for quantitative measurement of the different states of water bound to low surface area substrates (0.1 m2/g) is described. The method involves the thermodesorption of water from a substrate with subsequent measurement of the desorbed water as a function of temperature using a P205 electrolytic cell.
This technique was used to study water on pure silica and silicas doped with metal cations. Strongly bound molecular water and water resulting from dehydroxylation reactions were detected and quantitatively measured. Results were consistent with previous studies of porous silicas. The presence of cation-aluminate sites on the silica surface greatly increased the amount of strongly bound water.
Studies of the desorption of water from glass fibers are also presented. It is concluded that water exists on glass fibers as either physically adsorbed water, chemisorbed molecular water, surface hydroxyl groups, near surface internal water, or bulk water.
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Nishioka, G.M., Schramke, J.A. (1985). Desorption of Water from Glass Fibers. In: Ishida, H., Kumar, G. (eds) Molecular Characterization of Composite Interfaces. Polymer Science and Technology, vol 27. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2251-9_23
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DOI: https://doi.org/10.1007/978-1-4899-2251-9_23
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