Wan Xiaoxi, Li Jun, Li Na, Zhang Jingxi, Gu Yongwan, Chen Guo, Ju Shaohua
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming 650093, China.
Materials (Basel). 2023 Mar 10;16(6):2217. doi: 10.3390/ma16062217.
Herein, micron-sized silver particles were prepared using the chemical reduction method by employing a Y-type microjet reactor, silver nitrate as the precursor, ascorbic acid as the reducing agent, and gelatin as the dispersion at room temperature (23 °C ± 2°C). Using a microjet reactor, the two reaction solutions collide and combine outside the reactor, thereby avoiding microchannel obstruction issues and facilitating a quicker and more convenient synthesis process. This study examined the effect of the jet flow rate and dispersion addition on the morphology and size of silver powder particles. Based on the results of this study, spherical and dendritic silver particles with a rough surface can be prepared by adjusting the flow rate of the reaction solution and gelatin concentration. The microjet flow rate of 75 mL/min and the injected gelatin amount of 1% of the silver nitrate mass produced spherical ultrafine silver particles with a size of 4.84 μm and a tap density of 5.22 g/cm.
在此，采用化学还原法，以硝酸银为前驱体，抗坏血酸为还原剂，明胶为分散剂，在室温（23℃±2℃）下，利用Y型微射流反应器制备了微米级银颗粒。使用微射流反应器时，两种反应溶液在反应器外部碰撞并混合，从而避免了微通道堵塞问题，并促进了更快、更便捷的合成过程。本研究考察了射流流速和分散剂添加量对银粉颗粒形态和尺寸的影响。基于本研究结果，通过调节反应溶液的流速和明胶浓度，可以制备出表面粗糙的球形和树枝状银颗粒。微射流流速为75 mL/min且注入的明胶量为硝酸银质量的1%时，可制备出尺寸为4.84μm、振实密度为5.22 g/cm的球形超细银颗粒。
