Crust effect on multiscale pattern formations in drying micelle solution   drops on solid substrates

doi:10.1021/la049535

CORC > 北京大学 > 化学与分子工程学院

	Crust effect on multiscale pattern formations in drying micelle solution drops on solid substrates
	Ma, X ; Xia, Y ; Chen, EQ ; Mi, YG ; Wang, XR ; Shi, AC
刊名	langmuir
	2004
关键词	COLLOIDAL SUSPENSION DIBLOCK COPOLYMER CRACK PATTERNS SPIN-CAST FILM EVAPORATION GLASS CRYSTALLIZATION SHRINKAGE BEHAVIOR
DOI	10.1021/la049535
英文摘要	Spherical micelles of a polystyrene-b-poly(dimethylsiloxane) (PS-b-PDMS) diblock copolymer with the number-average molecular weight of 193 000 g/mol for PS and 39 000 g/mol for PDMS were obtained by using n-dodecane or n-octane as the selective solvent for the PDMS block. The drying process of micelle solution drops with relatively high polymer concentration on solid substrates and the resultant drying patterns were studied using optical microscopy and atomic force microscopy. The drying drops exhibited an inner solution "cap" connecting with an outer gelled "foot" through a transition zone. A crust was first formed on the surface of the transition zone and remained on the top of the foot region. An inhomogeneous stress perpendicular to the radial direction within the crust, which was due to the solvent evaporation accompanied by the receding of the solution cap, induced regular 45degrees-tilted stripes (pleats) in the transition zone and main radial cracks in the foot region. The stripes and cracks have periods of a few and tens of microns, respectively. Concave micelle "bricks" were also observed between cracks. In addition to micelle close packing, these patterns demonstrate that drying micelle solution drops may provide a potential means to manipulate fine and multiscale structures for technological applications.; Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary; SCI(E); EI; PubMed; 18; ARTICLE; 22; 9520-9525; 20
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/400158]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Ma, X,Xia, Y,Chen, EQ,et al. Crust effect on multiscale pattern formations in drying micelle solution drops on solid substrates[J]. langmuir,2004.
APA	Ma, X,Xia, Y,Chen, EQ,Mi, YG,Wang, XR,&Shi, AC.(2004).Crust effect on multiscale pattern formations in drying micelle solution drops on solid substrates.langmuir.
MLA	Ma, X,et al."Crust effect on multiscale pattern formations in drying micelle solution drops on solid substrates".langmuir (2004).