The rectification of electro-osmotic flows is important in micro- and nano-fluidics applications such as micropumps energy conversion devices. Here, we propose a simple diode which colloidal particles are contained between two parallel membranes with different pore densities. While the flow forward direction just pushes toward high-pore-density membrane, backward blocked by near low-pore-densit...

The use of photoexcited electrons and holes in semiconductor nanocrystals as reduction and oxidation reagents is an intriguing way of harvesting photon energy to drive chemical reactions. This review focuses on recent research efforts to understand and control the photocatalytic processes mediated by colloidal II-VI nanocrystalline materials, such as cadmium and zinc chalcogenides. First, we hi...

to resolve handling problem of nanoparticles, due to their small size, a new methodology of electro-spraying and freeze-drying was developed for colloidal nanoparticles of silica and titania to transform them to solid macro-scale nanoparticle assemblies.  the assemblies were then redispersed in an aqueous system to investigate the effect of formulation of original solutions and the process para...

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