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- Title
Controlled assembly of jammed colloidal shells on fluid droplets.
- Authors
Subramaniam, Anand Bala; Abkarian, Manouk; Stone, Howard A.
- Abstract
Assembly of colloidal particles on fluid interfaces is a promising technique for synthesizing two-dimensional microcrystalline materials useful in fields as diverse as biomedicine, materials science, mineral flotation and food processing. Current approaches rely on bulk emulsification methods, require further chemical and thermal treatments, and are restrictive with respect to the materials used. The development of methods that exploit the great potential of interfacial assembly for producing tailored materials have been hampered by the lack of understanding of the assembly process. Here we report a microfluidic method that allows direct visualization and understanding of the dynamics of colloidal crystal growth on curved interfaces. The crystals are periodically ejected to form stable jammed shells, which we refer to as colloidal armour. We propose that the energetic barriers to interfacial crystal growth and organization can be overcome by targeted delivery of colloidal particles through hydrodynamic flows. Our method allows an unprecedented degree of control over armour composition, size and stability.
- Subjects
LETTERS to the editor; PARTICLES
- Publication
Nature Materials, 2005, Vol 4, Issue 7, p553
- ISSN
1476-1122
- Publication type
Letter
- DOI
10.1038/nmat1412