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dc.contributor.authorZeng, Hongbo
dc.contributor.authorKristiansen, Kai De Lange
dc.contributor.authorWang, Peng
dc.contributor.authorBergli, Joakim
dc.contributor.authorIsraelachvili, Jacob N.
dc.date.accessioned2015-08-03T09:04:51Z
dc.date.available2015-08-03T09:04:51Z
dc.date.issued2011-06-07
dc.identifier.issn07437463
dc.identifier.pmid21553914
dc.identifier.doi10.1021/la200476n
dc.identifier.urihttp://hdl.handle.net/10754/561798
dc.description.abstractEvaporation of aqueous droplets of carbon nanotubes (CNTs) coated with a physisorbed layer of humic acid (HA) on a partially hydrophilic substrate induces the formation of a film of CNTs. Here, we investigate the role that the global geometry of the substrate surfaces has on the structure of the CNT film. On a flat mica or silica surface, the evaporation of a convex droplet of the CNT dispersion induces the well-known "coffee ring", while evaporation of a concave droplet (capillary meniscus) of the CNT dispersion in a wedge of two planar mica sheets or between two crossed-cylinder sheets induces a large area (>mm 2) of textured or patterned films characterized by different short- and long-range orientational and positional ordering of the CNTs. The resulting patterns appear to be determined by two competing or cooperative sedimentation mechanisms: (1) capillary forces between CNTs giving micrometer-sized filaments parallel to the boundary line of the evaporating droplet and (2) fingering instability at the boundary line of the evaporating droplet and subsequent pinning of CNTs on the surface giving micrometer-sized filaments of CNTs perpendicular to this boundary line. The interplay between substrate surface geometry and sedimentation mechanisms gives an extra control parameter for manipulating patterns of self-assembling nanoparticles at substrate surfaces. © 2011 American Chemical Society.
dc.publisherAmerican Chemical Society (ACS)
dc.titleSurface-induced patterns from evaporating droplets of aqueous carbon nanotube dispersions
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.contributor.departmentEnvironmental Nanotechnology Lab
dc.identifier.journalLangmuir
dc.contributor.institutionDepartment of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada
dc.contributor.institutionDepartment of Chemical Engineering, Materials Research Laboratory, United States
dc.contributor.institutionBren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States
dc.contributor.institutionDepartment of Physics, University of Oslo, 0316 Oslo, Norway
kaust.personWang, Peng


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