Surface-induced patterns from evaporating droplets of aqueous carbon nanotube dispersions

Handle URI:
http://hdl.handle.net/10754/561798
Title:
Surface-induced patterns from evaporating droplets of aqueous carbon nanotube dispersions
Authors:
Zeng, Hongbo; Kristiansen, Kai De Lange; Wang, Peng ( 0000-0003-0856-0865 ) ; Bergli, Joakim; Israelachvili, Jacob N.
Abstract:
Evaporation 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.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Environmental Nanotechnology Lab
Publisher:
American Chemical Society (ACS)
Journal:
Langmuir
Issue Date:
7-Jun-2011
DOI:
10.1021/la200476n
PubMed ID:
21553914
Type:
Article
ISSN:
07437463
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZeng, Hongboen
dc.contributor.authorKristiansen, Kai De Langeen
dc.contributor.authorWang, Pengen
dc.contributor.authorBergli, Joakimen
dc.contributor.authorIsraelachvili, Jacob N.en
dc.date.accessioned2015-08-03T09:04:51Zen
dc.date.available2015-08-03T09:04:51Zen
dc.date.issued2011-06-07en
dc.identifier.issn07437463en
dc.identifier.pmid21553914en
dc.identifier.doi10.1021/la200476nen
dc.identifier.urihttp://hdl.handle.net/10754/561798en
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.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleSurface-induced patterns from evaporating droplets of aqueous carbon nanotube dispersionsen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Nanotechnology Laben
dc.identifier.journalLangmuiren
dc.contributor.institutionDepartment of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canadaen
dc.contributor.institutionDepartment of Chemical Engineering, Materials Research Laboratory, United Statesen
dc.contributor.institutionBren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United Statesen
dc.contributor.institutionDepartment of Physics, University of Oslo, 0316 Oslo, Norwayen
kaust.authorWang, Pengen

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