Linear colloidal crystal arrays by electrohydrodynamic printing


Poon, H. F. ; Saville, D. A. ; Aksay, I. A. Linear colloidal crystal arrays by electrohydrodynamic printing. Applied Physics Letters 2008, 93.

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We use electrohydrodynamic jets of colloidal suspensions to produce arrays of colloidal crystalline stripes on surfaces. A critical factor in maintaining a stable jet is the distance of separation between the nozzle and the surface. Colloidal crystalline stripes are produced as two wetting lines of the deployed suspension merge during drying. To ensure that the two wetting lines merge, the "deployed-line-width" to "particle size" ratio is kept below a critical value so that the capillary forces overcome the frictional forces between the particles and the substrate. (C) 2008 American Institute of Physics.