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

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:495

Article

Anovitz, Lawrence M.¹  Rondinone, Adam J.²  Sochalski-Kolbus, Lindsay³  Rosenqvist, Jorgen^1,4  Cheshire, Michael C.¹ 

[1] Oak Ridge Natl Lab, Div Chem Sci, MS 6110,POB 2008,Bldg 4100, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci Div, MS 6494,POB 2008,Bldg 8610, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Chem & Engn Mat Div, MS 6454,POB 2008,Bldg 8600, Oak Ridge, TN 37831 USA

[4] Univ Gothenburg, Dept Chem & Mol Biol, S-41296 Gothenburg, Sweden

关键词: Forsterite;    Enstatite;    Olivine;    Pyroxene;    Orthopyroxene;    Clinopyroxene;    Nanosynthesis;   

DOI  :  10.1016/j.jcis.2017.01.052

来源: Elsevier

【 摘 要 】

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 degrees 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 m(2)/g. The results of a preliminary attempt to use this approach to synthesize nano-scale orthopyroxene (MgSiO3) are also reported. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

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