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纳米颗粒会影响T型微流体中的液滴形成。

Nanoparticles influence droplet formation in a T-shaped microfluidic.

作者信息

Wang Ruijin

机构信息

Zhejiang University of Science and Technology, Hangzhou, 310023 China.

出版信息

J Nanopart Res. 2013;15(12):2128. doi: 10.1007/s11051-013-2128-x. Epub 2013 Nov 30.

DOI:10.1007/s11051-013-2128-x
PMID:24339728
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3853645/
Abstract

Droplet formation in the presence of nanoparticles was studied in a T-shaped microfluidic device numerically. Nanoparticles in continuous phase did not influence droplet formation dynamics obviously. Contrarily, the presence of nanoparticles in dispersed phase will influence evidently droplet formation dynamics, likely reasons are the accumulation of nanoparticles at the liquid-liquid interface leading to the variation of interfacial tension and the anisotropy of nanoparticles' movement at interface. The droplet size decreases almost linearly with increasing of the volume fraction of nanoparticles in dispersed phase when the volume fraction of nanoparticles not exceeding a critical value (about 0.2 %), because very high concentration of nanoparticles results in particle aggregation so as to not decrease interfacial tension so obviously any more. A complicated mechanism of temperature influences on droplet formation may exist combining the variations of effective viscosity and interfacial tension. Discussions on microscopic mechanism of droplet formation in the presence of nanoparticles were carried out.

摘要

在T形微流控装置中对存在纳米颗粒时的液滴形成进行了数值研究。连续相中的纳米颗粒对液滴形成动力学没有明显影响。相反，分散相中纳米颗粒的存在会明显影响液滴形成动力学，可能的原因是纳米颗粒在液-液界面处的积累导致界面张力变化以及纳米颗粒在界面处运动的各向异性。当纳米颗粒的体积分数不超过临界值（约0.2%）时，液滴尺寸几乎随分散相中纳米颗粒体积分数的增加呈线性减小，因为非常高浓度的纳米颗粒会导致颗粒聚集，从而不再使界面张力明显降低。结合有效粘度和界面张力的变化，可能存在温度对液滴形成影响的复杂机制。对存在纳米颗粒时液滴形成的微观机制进行了讨论。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/e20077f075b7/11051_2013_2128_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/5d6750bd1129/11051_2013_2128_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/9503fc1d724b/11051_2013_2128_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/de49b59476af/11051_2013_2128_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/c7bb6db750fd/11051_2013_2128_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/96cc1b3da768/11051_2013_2128_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/9f98e2ea227c/11051_2013_2128_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/e20077f075b7/11051_2013_2128_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/5d6750bd1129/11051_2013_2128_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/9503fc1d724b/11051_2013_2128_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/de49b59476af/11051_2013_2128_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/c7bb6db750fd/11051_2013_2128_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/96cc1b3da768/11051_2013_2128_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/9f98e2ea227c/11051_2013_2128_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5749/3853645/e20077f075b7/11051_2013_2128_Fig7_HTML.jpg

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