Electrically Guided Assembly of Planar Superlattices in Binary Colloidal Suspensions

W. D. Ristenpart, Ilhan A. Aksay, D. A. Saville

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Binary colloidal suspensions are assembled into planar superlattices using ac electric fields. Either triangular or square-packed arrays form, depending on the frequency and relative particle concentrations. The frequency dependence is striking since superlattices develop at low and high frequencies but not at intermediate frequencies. We explain the low frequency behavior [Formula presented] in terms of induced-dipole repulsion balanced by attraction resulting from electrohydrodynamic (EHD) flow. At high frequencies (20–200 kHz), EHD flow is negligible but aggregation occurs since dipole-dipole interactions become attractive.

Original languageEnglish (US)
Pages (from-to)4
Number of pages1
JournalPhysical review letters
Issue number12
StatePublished - 2003

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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