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.

通常通过化学沉淀法合成氢氧化铟（In（OH）₃）和氧化铟（In ₂ O ₃）颗粒。在这项研究中，我们使用了种子介导的生长方法和基于微反应器的合成过程。我们从5％（w / v）的氯化铟溶液中合成了尺寸为172 nm的立方In（OH）₃颗粒。通过In（OH）₃粒子的热分解合成的In ₂ O ₃粒子具有最大90 nm的晶体，平均尺寸为73 nm，远大于20-30 nm In ₂ O _3的晶体。通过传统的沉淀方法合成的颗粒。种子和生长溶液的浓度从1％到7％（w / v）不等。颗粒的晶体尺寸随着种子溶液和生长溶液的浓度而增加。这种趋势与沉淀法观察到的相反。通过使用5％（w / v）的种子溶液，生长溶液的流速从1毫升/分钟改变为10毫升/分钟，并且随着流速的增加，晶体尺寸减小。为了理解这种趋势的原因，在不同的流速（即1、5和10 mL / min）下确定晶体的生长速率。建立了与实验结果一致的生长模型，该模型表明缓慢添加生长溶液对于制备大的氢氧化铟颗粒是有利的。