@article{120886,
  author = {W. D. Ristenpart and I.A. Aksay and D. A. Saville},
  title = {Electrically guided assembly of planar superlattices in binary colloidal suspensions},
  abstract = { Binary colloidal suspensions are assembled into planar superlattices using ac electric fields. Either<br>triangular or square-packed arrays form, depending on the frequency and relative particle concentrations.<br>The frequency dependence is striking since superlattices develop at low and high frequencies<br>but not at intermediate frequencies. We explain the low frequency behavior \&lt;3 kHz in terms of<br>induced-dipole repulsion balanced by attraction resulting from electrohydrodynamic (EHD) flow. At<br>high frequencies (20{\textendash}200 kHz), EHD flow is negligible but aggregation occurs since dipole-dipole<br>interactions become attractive. },
  year = {2003},
  journal = {Physical Review Letters},
  volume = {90},
  month = {03/2003},
  isbn = {0031-9007},
  language = {eng},
}