The Effect of Hydrothermal Treatment on Olivine Nano-Silica

M.C Griend, van de, A. Lazaro, H.J.H. Brouwers

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Abstract

This paper provides an overview of the effects of ripening the olivine nano-silica to form particles with a lower specific surface area for optimal use in high performance concrete. The nano-silica was ripened using a hydrothermal treatment in a mixed batch reactor at 90 C, pH ranging from 8 to 10 and a silica weight percentage of three and six percent. The specific surface area of the olivine nano-silica can be reduced by 62 percent by Ostwald ripening in 22 hours. This reduction corresponds to a 80 percent drop of the micropore surface area and a 57 percent drop of the external surface area. The different hydrothermal conditions did not affect the final specific surface area at the equilibrium. However, the use of a high energy mixer reduced the specific surface area by 52 percent in only five minutes. Despite the reduction in specific surface area, the aggregates of the original olivine nano-silica are not dissolved during the ripening process.
Original languageEnglish
Title of host publicationProceedings of the international conference nanomaterials: applications and properties (NAP2012), september 17 2012 - september 22 2012, Crimea, Ukraine
PublisherSumy State University
Pages01PCN31-1/3
Publication statusPublished - 2012
Eventconference; nanomaterials: applications and properties (NAP2012); 2012-09-17; 2012-09-22 -
Duration: 17 Sep 201222 Sep 2012

Conference

Conferenceconference; nanomaterials: applications and properties (NAP2012); 2012-09-17; 2012-09-22
Period17/09/1222/09/12
Othernanomaterials: applications and properties (NAP2012)

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  • Cite this

    Griend, van de, M. C., Lazaro, A., & Brouwers, H. J. H. (2012). The Effect of Hydrothermal Treatment on Olivine Nano-Silica. In Proceedings of the international conference nanomaterials: applications and properties (NAP2012), september 17 2012 - september 22 2012, Crimea, Ukraine (pp. 01PCN31-1/3). Sumy State University.