Directed Patterned Adsorption of Magnetic Beads Onpolyelectrolyte Multilayers on Glass

Author(s): Lyles, Bethany F., Marianne S. Terrot, Paula T. Hammond, Alice P. Gast

Journal: Langmuir (2004) 20: 3028-3031.

Abstract:
Here we present a study of patterning micrometer-sized features on glass surfaces with magnetic colloids. We employ a polyelectrolyte foundation composed of five bilayers on the surface of a glass slide. The directed assembly of carboxylate-modified superparamagnetic particles is accomplished by creating patterned regions of opposite charge via polymer-on-polymer stamping. Dot patterns created in a two-dimensional square array produce colloidal clusters with diameters ranging from 1 to 12 µm. Individual magnetic particles were patterned on the glass surface with micrometer-scale precision. Striped patterns also produced lines of magnetic particles varying in spacing and width from 1 to 7 µm.