A Class of Microstructured Particles Through Colloidal Crystallization

doi:10.1126/science.287.5461.2240

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Materials Science

Science 24 March 2000:
Vol. 287. no. 5461, pp. 2240 - 2243
DOI: 10.1126/science.287.5461.2240

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A Class of Microstructured Particles Through Colloidal Crystallization

Orlin D. Velev, ^* Abraham M. Lenhoff, Eric W. Kaler

Microstructured particles were synthesized by growing colloidal crystals in aqueous droplets suspended on fluorinated oil.The droplets template highly ordered and smooth particle assemblies,which diffract light and have remarkable structural stability.The method allows control of particle size and shape from spheresthrough ellipsoids to toroids by varying the droplet composition.Cocrystallization in colloidal mixtures yields anisotropic particlesof organic and inorganic materials that can, for example, be orientedand turned over by magnetic fields. The results open the way tocontrollable formation of a wide variety of microstructures.

Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA.
^* To whom correspondence should be addressed. E-mail: velev{at}che.udel.edu

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