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Surface Chemistry of Mesoporous Materials: Effect of Nanopore Confinement

Published online by Cambridge University Press:  11 February 2011

Yifeng Wang ,
Charles Bryan ,
Huifang Xu  and
Huizhen Gao
Yifeng Wang
Affiliation:
Sandia National Laboratories, Carlsbad, New Mexico 88220
Charles Bryan
Affiliation:
Sandia National Laboratories, Carlsbad, New Mexico 88220
Huifang Xu
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131–1116
Huizhen Gao
Affiliation:
Sandia National Laboratories, Carlsbad, New Mexico 88220
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Abstract

Acid-base titration and metal sorption experiments were performed on both mesoporous alumina and alumina particles under various ionic strengths. It has been demonstrated that surface chemistry and ion sorption within nanopores can be significantly modified by a nano-scale space confinement. As the pore size is reduced to a few nanometers, the difference between surface acidity constants (ΔpK = pK2 – pK1) decreases, giving rise to a higher surface charge density on a nanopore surface than that on an unconfined solid-solution interface. The change in surface acidity constants results in a shift of ion sorption edges and enhances ion sorption on that nanopore surfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 751: Symposium Z – Structure-Property Relationships of Oxide Surfaces and Interfaces II , 2002 , Z3.40
Copyright
Copyright © Materials Research Society 2003

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References

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