Electrophoretic Deposition for the Fabrication of Materials with Novel Properties through Microstructural Control

A.J. Pascall, M.A. Worsley, J.S. Park, D. Saintillan, J.D. Kuntz
Lawrence Livermore National Laboratory, US

Keywords: EPD, additive manufacturing, dynamic electrode, microfabrication, experiment, modeling

Summary:

Precise control over a material’s microstructure is required to manufacture materials with properties that would be otherwise unobtainable in bulk materials. Electrophoretic deposition (EPD), a process in which suspended colloids are driven to an electrode by an electric field, is an attractive manufacturing technique because it inherently operates at the micro/nanoscale and is able to cover large areas with low power requirements. However, EPD has traditionally been limited to fabricating layered films. Here, we present techniques for fabricating complex 2D and 3D structures via EPD over light-patterned dynamic electrodes. In addition to experimental results demonstrating the techniques, we also detail the results of a Stokesian dynamics modeling effort that provides quantitative comparisons with the experiments and enables the prediction of the deposition dynamics and final structure.