The assembly of micron sized glass spheres on structured surfaces by dewetting
The assembly of micron sized glass spheres on structured surfaces by dewetting
Previous work [E.J. Tull, P.N. Bartlett, K.R. Ryan, Controlled assembly of micrometer-sized spheres: theory and application, Langmuir 23 (14) (2007) 7859–7873] has shown that many conventional assembly techniques are ineffective for the organisation of glassy spheres ?5 ?m in diameter, into sparse patterns of interest for optoelectronic device applications. In the present work the assembly of 10 ?m glass spheres on gold coated surfaces containing a distribution of pits was investigated in order to determine the conditions required to assemble glass spheres into the pits but leave the top surface free of adhering spheres when the surface dewets. The gold surfaces were patterned with self-assembled monolayers of thiols in order to control the wetting of the surface. When the surface is uniformly hydrophilic spheres are found to adhere everywhere. When the surface is uniformly hydrophobic no spheres remain or the surface or in the pits. Only when the pits were hydrophilic and the top surface hydrophobic was found possible to assemble spheres selectively into the pits.
spheres, self-assembly, structured substrates, wetting, capillary, PDMS, chemical patterning, particles
71-78
Tull, Elizabeth J.
a5bc1534-4c85-400b-826d-2d9012442faa
Bartlett, Phillip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
15 September 2008
Tull, Elizabeth J.
a5bc1534-4c85-400b-826d-2d9012442faa
Bartlett, Phillip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Tull, Elizabeth J. and Bartlett, Phillip N.
(2008)
The assembly of micron sized glass spheres on structured surfaces by dewetting.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 327 (1-3), .
(doi:10.1016/j.colsurfa.2008.06.020).
Abstract
Previous work [E.J. Tull, P.N. Bartlett, K.R. Ryan, Controlled assembly of micrometer-sized spheres: theory and application, Langmuir 23 (14) (2007) 7859–7873] has shown that many conventional assembly techniques are ineffective for the organisation of glassy spheres ?5 ?m in diameter, into sparse patterns of interest for optoelectronic device applications. In the present work the assembly of 10 ?m glass spheres on gold coated surfaces containing a distribution of pits was investigated in order to determine the conditions required to assemble glass spheres into the pits but leave the top surface free of adhering spheres when the surface dewets. The gold surfaces were patterned with self-assembled monolayers of thiols in order to control the wetting of the surface. When the surface is uniformly hydrophilic spheres are found to adhere everywhere. When the surface is uniformly hydrophobic no spheres remain or the surface or in the pits. Only when the pits were hydrophilic and the top surface hydrophobic was found possible to assemble spheres selectively into the pits.
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Published date: 15 September 2008
Keywords:
spheres, self-assembly, structured substrates, wetting, capillary, PDMS, chemical patterning, particles
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Local EPrints ID: 145039
URI: http://eprints.soton.ac.uk/id/eprint/145039
ISSN: 0927-7757
PURE UUID: 0d310daa-527e-4522-b334-ef9d4cf8be2d
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Date deposited: 15 Apr 2010 15:00
Last modified: 14 Mar 2024 02:36
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Author:
Elizabeth J. Tull
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