Kawasaki Shin-ichiro, Sue Kiwamu, Ookawara Ryuto, Wakashima Yuichiro, Suzuki Akira
Research Center for Compact Chemical System, National Institute of Advanced Industrial Science and Technology, Miyagi, Japan.
J Oleo Sci. 2010;59(10):557-62. doi: 10.5650/jos.59.557.
Novel micro swirl mixers were developed to synthesize nanoparticles, and the effect of their mixing performance on the characteristics of the synthesized nanoparticles was determined. The results were compared with those obtained using simple T-shaped mixers under the same reaction conditions. The synthesis of NiO, whose characteristics depend on the mixing performance of the mixer, was chosen as a model reaction. Initial investigations highlighted that the average particle size decreased from 32 to 23 to 20 nm as the inner diameter of the swirl mixers was decreased from 3.2 mm (Swirl mixer, SM-3.2) to 0.8 mm (Micro swirl mixer, MSM-0.8) to 0.5 mm (Micro swirl mixer, MSM-0.5), respectively. On the other hand, a similar decrease in the average particle size from 34 to 20 nm was observed with a decrease in the inner diameter of the T-shaped mixers from 1.3 mm (Tee union, T-1.3) to 0.3 mm (Micro tee union, T-0.3), respectively. Further, narrow particle size distributions were observed with a decrease in the inner diameter of each mixer. Furthermore, a computational fluid dynamics (CFD) simulation indicated an excellent mixing mechanism, which contributed to the improvement in the heating rate and the formation of nanoparticles of smaller size with a narrow particle size distribution. The result presented here indicates that the micro swirl mixers produce high-quality metal oxide nanoparticles. The size of the obtained particles with improved size distributions was comparable to that of the particles obtained using the T-shaped mixers, although the inner diameter of the swirl mixers was larger. Therefore, preliminary evidence suggests that the swirl flow mixers have the ability to produce rapid and homogeneous fluid mixing, thus controlling the particle size.
开发了新型微涡旋混合器用于合成纳米颗粒，并确定了其混合性能对合成纳米颗粒特性的影响。将结果与在相同反应条件下使用简单T形混合器获得的结果进行比较。选择特性取决于混合器混合性能的NiO合成作为模型反应。初步研究表明，随着涡旋混合器的内径分别从3.2毫米（涡旋混合器，SM-3.2）减小到0.8毫米（微涡旋混合器，MSM-0.8）再减小到0.5毫米（微涡旋混合器，MSM-0.5），平均粒径分别从32纳米减小到23纳米再减小到20纳米。另一方面，随着T形混合器的内径分别从1.3毫米（三通接头，T-1.3）减小到0.3毫米（微三通接头，T-0.3），平均粒径也出现了类似的从34纳米减小到20纳米的情况。此外，随着每个混合器内径的减小，观察到粒径分布变窄。此外，计算流体动力学（CFD）模拟表明存在出色的混合机制，这有助于提高加热速率并形成粒径更小且粒径分布窄的纳米颗粒。此处呈现的结果表明，微涡旋混合器可生产高质量的金属氧化物纳米颗粒。尽管涡旋混合器的内径较大，但获得的粒径分布改善后的颗粒尺寸与使用T形混合器获得的颗粒尺寸相当。因此，初步证据表明涡旋流混合器有能力实现快速且均匀的流体混合，从而控制颗粒尺寸。
