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Science 17 December 1999:
Vol. 286. no. 5448, p. 2229
DOI: 10.1126/science.286.5448.2229e
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The assembly of colloidal particles of one charge and surfactants of the opposite charge normally creates three-dimensional fractal aggregates. Ramos et al. (p. 2325) examined the interaction of negatively charged latex particles with vesicles made from neutral and cationic surfactants. In certain composition ranges, the latex particles assembled into two-dimensional (2D) crystals of several hundred particles that were robust against dilution or shearing. In the authors' model for crystal formation, the latex particles adsorb onto a vesicle until charge is neutralized and then attract to form a "raft." The bilayers present on the particles eventually fuse and form the final crystal.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)