Preparation of large In(OH)3 and In2O3 particles through a seed-mediated growth method in a microreactor--颗粒学报PARTICUOLOGY

Wang, J., Bai, S., Wang, Y., Luo, G., & Wang, T. (2020). Preparation of large In(OH)3 and In2O3 particles through a seed-mediated growth method in a microreactor. Particuology, 49, 1-8. https://doi.org/10.1016/j.partic.2019.04.006

Preparation of large In(OH)₃ and In₂O₃ particles through a seed-mediated growth method in a microreactor

Jingchuo Wang, Shaoqing Bai, Yujun Wang ^*, Guangsheng Luo, Tao Wang

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2019.04.006

Volume 49, April 2020, Pages 1-8

Received 22 January 2019, Revised 29 March 2019, Accepted 1 April 2019, Available online 22 June 2019, Version of Record 26 February 2020.

E-mail: wangyujun@mail.tsinghua.edu.cn

Highlights

In(OH)₃ and In₂O₃ particles through a seed-mediated growth method in microreactor were synthesized.
Seed-mediated particles were larger than those synthesized by precipitation method.
Particles size increased with concentrations and decreased with flow rates.
A growth model consistent with the experimental results was established.

Abstract

Indium hydroxide (In(OH)₃) and indium oxide (In₂O₃) particles are typically synthesized through chemical precipitation methods. In this study, we used a seed-mediated growth method and microreactor-based synthesis process. We synthesized cubic In(OH)₃ particles with a crystal size of 172 nm from an 5% (w/v) indium chloride solution. The In₂O₃ particles synthesized through the thermal decomposition of In(OH)₃ particles featured crystals up to 90 nm in size with an average size of 73 nm, which were much larger than the 20–30 nm In₂O₃ particles synthesized by a traditional precipitation method. The concentrations of the seed and growth solutions were varied from 1% to 7% (w/v). The crystal size of the particles increased with the concentration of the seed and growth solutions; this tendency was the opposite to that observed for the precipitation method. Through the use of a 5% (w/v) seed solution, the flow rate of the growth solution was varied from 1 to 10 mL/min, and the resulting crystal size decreased as the flow rate was increased. To understand the reasons for this trend, the growth rate of the crystals was determined at different flow rates (i.e., 1, 5, and 10 mL/min). A growth model consistent with the experimental results was established, which demonstrated that slow addition of the growth solution was beneficial for preparing large indium hydroxide particles.

Graphical abstract

Keywords

Indium hydroxide; Indium oxide; Growth model; Crystal size; Seed-mediated growth

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