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Nano-scale synthesis of the complex silicate minerals forsterite and enstatite

by Lawrence M. Anovitz, Adam J. Rondinone, Lindsay Sochalski-Kolbus, Jörgen Rosenqvist, Michael C. Cheshire

Abstract 

Olivine is a relatively common family of silicate minerals in many terrestrial and extraterrestrial environments, and is also useful as a refractory ceramic. A capability to synthesize fine particles of olivine will enable additional studies on surface reactivity under geologically relevant conditions. This paper presents a method for the synthesis of nanocrystalline samples of the magnesium end-member, forsterite (Mg2SiO4) in relatively large batches (15–20 g) using a sol-gel/surfactant approach. Magnesium methoxide and tetraethylorthosilicate (TEOS) are refluxed in a toluene/methanol mixture using dodecylamine as a surfactant and tert-butyl amine and water as hydrolysis agents. This material is then cleaned and dried, and fired at 800 °C. Post-firing reaction in hydrogen peroxide was used to remove residual organic surfactant. X-ray diffraction showed that a pure material resulted, with a BET surface area of up to 76.6 m2/g. The results of a preliminary attempt to use this approach to synthesize nano-scale orthopyroxene (MgSiO3) are also reported.

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Publication Citation

Journal of Colloid and Interface Science 2017 pp 94-101 March 14, 2017
DOI: dx.doi.org/10.1016/j.jcis.2017.01.052

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