Development of novel micro swirl mixer for producing fine metal oxide nanoparticles by continuous supercritical hydrothermal method.
Development of novel micro swirl mixer for producing fine metal oxide nanoparticles by continuous supercritical hydrothermal method.
复制标题
开发新型微旋流混合器，用于通过连续超临界水热法生产细金属氧化物纳米颗粒。
DOI：
10.5650/jos.59.557
复制
发表时间：
2010
影响因子：
1.5
通讯作者：
Akira Suzuki
中科院分区：
文献类型：
--
作者：
Shin;K. Sue;R. Ookawara;Y. Wakashima;Akira Suzuki
研制了一种新型的微旋流混合器用于纳米粒子的合成，并研究了其混合性能对合成纳米粒子特性的影响。在相同的反应条件下，使用简单的T形混合器得到的结果进行了比较。NiO的合成，其特性取决于混合器的混合性能，被选为模型反应。初步研究强调，随着旋流混合器的内径分别从3.2 mm（旋流混合器，SM-3.2）减小到0.8 mm（微旋流混合器，MSM-0.8）再减小到0.5 mm（微旋流混合器，MSM-0.5），平均粒度从32 nm减小到23 nm再减小到20 nm。另一方面，随着T形混合器的内径分别从1.3 mm（T形接头，T-1.3）减小到0.3 mm（微型T形接头，T-0.3），观察到平均粒度从34 nm类似地减小到20 nm。此外，随着每个混合器的内径的减小，观察到窄的粒度分布。此外，计算流体动力学（CFD）模拟表明，一个优秀的混合机制，这有助于提高加热速率和形成的纳米粒子的较小尺寸与窄的粒度分布。这里给出的结果表明，微旋流混合器产生高质量的金属氧化物纳米颗粒。所获得的具有改进的尺寸分布的颗粒的尺寸与使用T形混合器获得的颗粒的尺寸相当，尽管旋流混合器的内径更大。因此，初步证据表明，旋流混合器具有产生快速和均匀的流体混合的能力，从而控制粒度。
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.