Temperature-controlled directional spreading of water on a surface with high hysteresis

doi:10.1038/am.2013.70

CORC > 化学研究所 > 中国科学院化学研究所

	Temperature-controlled directional spreading of water on a surface with high hysteresis
	Hou, Yongping 1,2; Xue, Baolong 1,2; Guan, Song 1,2; Feng, Shile 1,2; Geng, Zhi 1,2; Sui, Xin 1,2; Lu, Junhui 1,2; Gao, Longcheng 1,2; Jiang, Lei 1,2,3
刊名	NPG ASIA MATERIALS
	2013-12-01
卷号	5
关键词	Block Copolymer Directional Water Spreading Pnipaam Temperature-controlled
ISSN号	1884-4049
DOI	10.1038/am.2013.70
英文摘要	The actuation of microscale liquid droplets is a key point in the lab-on-chip field. Marangoni force actuation resulting from a temperature gradient has remarkable advantages. However, high hysteresis between the droplet and the surface is an obstacle to this motion. Here, we take advantage of the temperature-responsive wettability of a surface made of a block copolymer (BCP) to show the temperature-controlled directional spreading of water droplets. By applying a temperature gradient on the BCP surface, both the topologies and chemical components in the nanodomains could be changed gradually. As a result, a wettability gradient force would form with the same direction as the Marangoni force, which could also be formed due to the same temperature gradient, and the collaborative effect of these forces could help overcome the high hysteresis. This was confirmed theoretically by calculating the total force acting on the droplet. The liquid droplet was observed to move by forces of non-mechanical origin in experiments conducted using a thermal gradient on the BCP films. Furthermore, two water droplets were observed to merge into one when they were placed in a V-shaped temperature field. These results help us understand the motion of droplets on a surface with high hysteresis and provide potential applications in microfluidic devices.
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000328960300003
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/54135]
专题	中国科学院化学研究所
通讯作者	Gao, Longcheng
作者单位	1.Beihang Univ, Sch Chem & Environm, Key Lab Bioinspired Smart Interfacial Sci & Techn, Beijing 100191, Peoples R China 2.Beihang Univ, Sch Chem & Environm, Minist Educ, Beijing 100191, Peoples R China 3.Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, BNLMS, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Hou, Yongping,Xue, Baolong,Guan, Song,et al. Temperature-controlled directional spreading of water on a surface with high hysteresis[J]. NPG ASIA MATERIALS,2013,5.
APA	Hou, Yongping.,Xue, Baolong.,Guan, Song.,Feng, Shile.,Geng, Zhi.,...&Jiang, Lei.(2013).Temperature-controlled directional spreading of water on a surface with high hysteresis.NPG ASIA MATERIALS,5.
MLA	Hou, Yongping,et al."Temperature-controlled directional spreading of water on a surface with high hysteresis".NPG ASIA MATERIALS 5(2013).