Electric-Field-Induced Reversible Phase Transitions in Two-Dimensional Colloidal Crystals

Kelsey A. Collins, Xiao Zhong, Pengcheng Song, Neva R. Little, Michael Ward, Stephanie S. Lee

Research output: Contribution to journalArticle

Abstract

Two-dimensional colloidal crystals confined within electric field traps on the surface of a dielectrophoretic cell undergo reversible phase transitions that depend on the strength of the applied AC electric field. At low field strengths, the particles adopt a two-dimensional hexagonal close-packed lattice with p6m plane group symmetry and the maximum achievable packing fraction of φ = 0.91. Higher electric field strengths induce dipoles in the particles that provoke a phase transition to structures that depend on the number of particles confined in the trap. Whereas traps containing N = 24 particles transform to a square-packed lattice with p4m symmetry and φ = 0.79 is observed, traps of the same size containing N = 23 particles can also pack in a lattice with p2 symmetry and φ = 0.66. Traps with N = 21, 22, and 25 particles exhibit a mixture of packing structures, revealing the influence of lateral compressive forces, in addition to induced dipole interactions, in stabilizing loosely packed arrangements. These observations permit construction of a phase diagram based on adjustable parameters of electric field strength (0-750 V/cm) and particle number (N = 21-25).

Original languageEnglish (US)
Pages (from-to)10411-10417
Number of pages7
JournalLangmuir
Volume31
Issue number38
DOIs
StatePublished - Sep 29 2015

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Phase transitions
Electric fields
Crystals
electric fields
traps
crystals
electric field strength
symmetry
Phase diagrams
close packed lattices
dipoles
field strength
alternating current
phase diagrams
cells
interactions

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Electric-Field-Induced Reversible Phase Transitions in Two-Dimensional Colloidal Crystals. / Collins, Kelsey A.; Zhong, Xiao; Song, Pengcheng; Little, Neva R.; Ward, Michael; Lee, Stephanie S.

In: Langmuir, Vol. 31, No. 38, 29.09.2015, p. 10411-10417.

Research output: Contribution to journalArticle

Collins, Kelsey A. ; Zhong, Xiao ; Song, Pengcheng ; Little, Neva R. ; Ward, Michael ; Lee, Stephanie S. / Electric-Field-Induced Reversible Phase Transitions in Two-Dimensional Colloidal Crystals. In: Langmuir. 2015 ; Vol. 31, No. 38. pp. 10411-10417.
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