Kikuchi Yosuke, Yamada Hirotsugu, Kunimori Hiromi, Tsukada Takao, Hozawa Mitsunori, Yokoyama Chiaki, Kubo Masaki
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1 -1, Aoba-ku, Sendai 980-8577, Japan.
Langmuir. 2005 Apr 12;21(8):3273-8. doi: 10.1021/la048011j.
In this study, the aggregation and breakup behaviors of latex particles in shear flow confined between two parallel plates were investigated using an in situ observation apparatus with a laser scanning confocal microscope. To investigate the effects of shear rate and the gap width between two parallel plates on the size and structure of the aggregates in the steady state, the distributions of the projected cross-sectional area and perimeter-based fractal dimension of the aggregates were measured. As a result, the average size of the aggregates decreases as shear rate increases and the gap width decreases due to the hydrodynamic effect acting on the aggregates. The size distributions of the aggregates become narrow as the gap width decreases. In addition, the fractal dimension, that is, the structure of the aggregates, was almost independent of shear rate and the gap width and approximately 1.2, which suggests that the aggregates are relatively compact.
在本研究中，使用带有激光扫描共聚焦显微镜的原位观察装置，研究了夹在两个平行板之间的剪切流中乳胶颗粒的聚集和破碎行为。为了研究剪切速率和平行板之间的间隙宽度对稳态下聚集体尺寸和结构的影响，测量了聚集体的投影横截面积分布和基于周长的分形维数。结果表明，由于作用在聚集体上的流体动力学效应，聚集体的平均尺寸随着剪切速率的增加和间隙宽度的减小而减小。随着间隙宽度的减小，聚集体的尺寸分布变窄。此外，分形维数，即聚集体的结构，几乎与剪切速率和间隙宽度无关，约为1.2，这表明聚集体相对致密。
Zotero 插件