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. 2005 Feb 16;127(6):1632-3.
doi: 10.1021/ja0443326.

Interfacial pH at an isolated silica-water surface

Josephine P O'Reilly  1 , Craig P Butts, Ian A l'Anson, Andrew M Shaw
Affiliations

Interfacial pH at an isolated silica-water surface

Josephine P O'Reilly et al. J Am Chem Soc. .

Abstract

Tethering a pH-sensitive dye to a silica surface enables the interfacial pH to be measured optically and is found to be 2 pH units lower than that of the bulk. The positive H+ ions are attracted by the surface potential and have an enhanced concentration consistent with the previously determined surface potential of order -120 mV, with respect to zero in the bulk. A stable near-surface charged layer once formed is not disrupted by the bulk pH.

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