Crystal Whisker Growth on Porous Coatings

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Presentation transcript:

Crystal Whisker Growth on Porous Coatings Lorraine F. Francis, Department of Chemical Engineering and Materials Science, University of Minnesota The goals of this research are to elucidate the mechanism of crystal growth for needle-like KCl whiskers on the surfaces of solution saturated porous coatings, to control the whisker dimensions, and to explore the applications of the whiskers. Year 2 Results: Whiskers were grown on narrow lines of porous silica coating prepared by dip coating onto a hydrophilic / hydrophobic pattern created on a Si wafer. KCl sheets were formed on pattered coatings from growth onto fallen whiskers (3) In situ monitoring of whisker growth indicated whiskers can grow by ion addition to the base KCl Solution Whisker Growth Zone Liquid Level Front View Side View Porous Coating WHISKER GROWTH ON PATTERNED COATINGS Hydrophobic Spacing Convection Flow Diffusion Flow Evaporation Flux t1 t2 t3 100um Whiskers grown on a patterned coating 100um Sheet Fallen Whisker Whisker Porous Coating Hydrophobic Spacing Sequence of images showing a whisker growing from the base Sheets grown from a fallen whisker on patterned coating