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Updated: Jul 20, 2026

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
Published on: March 27, 2019
Influence of kinetics on the determination of the surface reactivity of oxide suspensions by acid-base titration
1Université Pierre et Marie Curie-Paris 6, ENSCP, CNRS-UMR 7575, Laboratoire d'Electrochimie et de Chimie Analytique, 11, Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France.
Abstract:
The effect of acid-base titration protocol and speed on pH measurement and surface charge calculation was studied on suspensions of gamma-alumina, hematite, goethite, and silica, whose size and porosity have been well characterized. The titration protocol has an important effect on surface charge calculation as well as on acid-base constants obtained by fitting of the titration curves. Variations of pH versus time after addition of acid or base to the suspension were interpreted as diffusion processes. Resulting apparent diffusion coefficients depend on the nature of the oxide and on its porosity.
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