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Volume 53
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Lan, Z., & Lu, Y. (2020). Tailoring morphology and bulk density of magnesium ethoxide particles by adding n-hexane and silicone oil. Particuology, 53, 168-174. https://doi.org/10.1016/j.partic.2020.02.002
Tailoring morphology and bulk density of magnesium ethoxide particles by adding n-hexane and silicone oil
Zhou Lan, Yangcheng Lu *
State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
10.1016/j.partic.2020.02.002
Volume 53, December 2020, Pages 168-174
Received 23 January 2020, Revised 12 February 2020, Accepted 13 February 2020, Available online 16 April 2020, Version of Record 16 December 2020.
E-mail: luyc@tsinghua.edu.cn
Highlights

• Introduced silicone oil and n-hexane to tailor preparation of Mg(OEt)2 particles.

• Obtained particles with uniform morphology, small size, and high bulk density.

• Controlled synergic solvent effects improved particle preparation flexibility.

• n-Hexane regulated polarity to control precipitation rate and seed size.

• Silicone oil assured appropriate inter-particle dispersion and particle uniformity.


Abstract

In this work, we used the inert substances silicone oil and n-hexane to modulate the solvent environment, and in so doing tailor the preparation of magnesium ethoxide (Mg(OEt)2) particles. We found the following: (1) nonpolar n-hexane mainly modulates the polarity of the solvent to control the precipitation rate and size of the Mg(OEt)2 seeds, thereby triggering accelerated nucleation to form small primary particles; and (2) silicone oil (relatively high polarity and viscosity) facilitates the growth and agglomeration stage, to improve inter-particle dispersion and obtain relatively uniform Mg(OEt)2 particles. We summarized these findings in a common mechanism for preparing Mg(OEt)2 particles with uniform morphology, small size, and high bulk density as per the synergistic effect of n-hexane and silicone oil. The ratios of silicone oil and n-hexane are flexible, and afford various regular and well-dispersed Mg(OEt)2 particles that are 5–30 μm in size and 0.2–0.7 g/cm3 in bulk density. The nanoparticles thus have the potential to serve in diverse applications such as catalysis.

Graphical abstract
Keywords
Magnesium ethoxide; Silicone oil; n-Hexane; Synergic effect
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