Electrophoretic deposition small particles

The electrophoretic deposition (EPD) of small particles, mainly in the nanometer size range, on microstructured objects is a rather inexpensive and simple method, characterized by the short time that is required for layer formation. 

The electrophoretic deposition of alumina in the presence of 5 wt% LNA per alumina yielded a deposit on the negative electrode in toluene and on the positive electrode in THE and EtAc. Although LNA is an acid (Eig. 2) relative to the alumina surface, the basic media THE and EtAc overrode the acidity of 5 wt% LNA, causing the negative charge on the alumina surface. In toluene, on the other hand, LNA reversed the charge on the alumina surface. This could be possible because the surface charge of alumina in toluene was nearly zero, shown by the very small amount of deposit of alumina particles on the positive electrode in the absence of LNA. 

Photo- and cathodoluminescence of nanoparticles of the well-known phosphor Y203 Eu have been studied by Lee et al. [290]. The particles were electrophoretically deposited on indium tin oxide coated glass. The small size, high crystallinity, narrow size distribution etc. of the microemulsion-generated particles as compared to conventional ones were thought to be responsible for relatively strong photo- and low voltage cathodoluminescence and low current saturation. 

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