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Issue 10, 2003
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Fabrication of asymmetrically coated colloid particles by microcontact printing techniques

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Abstract

We developed a novel method for preparation of asymmetrically coated colloid particles by using a microcontact printing technique. Films of water-insoluble ionic surfactants deposited on PDMS stamps were printed onto latex particle monolayers of opposite surface charge in order to produce spherical latex particles of dipolar surface charge distribution. We studied the effects of salt on the aggregation of such dipolar particles in aqueous suspensions. Upon addition of salt, dipolar colloid particles were found to give “linear” aggregates. We then extended this microcontact printing technique to the directed assembly of colloidal particles. Microcontact printing of one colloidal monolayer over a latex particle monolayer of opposite charge was used to fabricate particles of complex internal structure. We demonstrated that if the two colloid monolayers consist of particles of comparable sizes, this method allows fabrication of particle doublets. When the particle monolayer was stamped with another colloid monolayer of much smaller particle size complex structures as half-coated “raspberry”-like particles were obtained. Possible applications of these asymmetrically coated colloids include photonic crystals with novel symmetries, colloidal substitutes for liquid crystals and water-based electrorheological fluids.

Graphical abstract: Fabrication of asymmetrically coated colloid particles by microcontact printing techniques

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Publication details

The article was received on 18 Jul 2003, accepted on 19 Aug 2003 and first published on 02 Sep 2003


Article type: Paper
DOI: 10.1039/B308817K
Citation: J. Mater. Chem., 2003,13, 2445-2450
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    Fabrication of asymmetrically coated colloid particles by microcontact printing techniques

    O. Cayre, V. N. Paunov and O. D. Velev, J. Mater. Chem., 2003, 13, 2445
    DOI: 10.1039/B308817K

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