Ring deposition of drying suspension droplets

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	Ring deposition of drying suspension droplets
	Zhang, WB ; Liao, LG ; Yu, TX ; Ji, AL
刊名	ACTA PHYSICA SINICA
	2013
卷号	62 期号:19
关键词	droplet contact line evaporation particle
ISSN号	1000-3290
通讯作者	Ji, AL (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	Deposition of colloidal particles in a drying droplet is important in many scientific researches and technological applications. In this work, the ring deposition of drying droplets on a solid substrate is investigated experimentally at a microscopic level. A ring deposition is formed at the contact line as the water solution droplet containing SiO2 particles is drying, just like the formation of coffee ring. Contact line pinning is crucial to the ring deposition formation. There will be a replenish flow in the droplet towards the edge, and the particles are driven to the contact line, deposited on the substrate. As the particle mass fraction is large, the particles which are left inside the spot, when the droplet dries out, may form a single particle layer, packing in order. The contact angle of the droplet on glass substrate is very small, the SiO2 particles will gather at the rim of the droplet, which initially form a chain along the contact line. As more particles come to the rim, they are deposited in a line by line way to form a 2D close packing. Since the contact angle decreases with evaporation when the contact line is pinned, a capillary force between liquid surface and particles arises once the height of droplet surface near the contact line is lower than that of the particle, pushing the particles to move inward. The effect on the larger particles is more pronounced it even leads to a separation of the particles, with the smaller ones at the outer side.
资助信息	National Basic Research Program of China [2009CB930801, 2012CB933002]; National Natural Science Foundation of China [11290161, 51172272]; National Basic Research Program of China, the Innovation Program of the Chinese Academy of Sciences
语种	中文
公开日期	2014-01-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57408]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhang, WB,Liao, LG,Yu, TX,et al. Ring deposition of drying suspension droplets[J]. ACTA PHYSICA SINICA,2013,62(19).
APA	Zhang, WB,Liao, LG,Yu, TX,&Ji, AL.(2013).Ring deposition of drying suspension droplets.ACTA PHYSICA SINICA,62(19).
MLA	Zhang, WB,et al."Ring deposition of drying suspension droplets".ACTA PHYSICA SINICA 62.19(2013).