Abstract
Regulation of lyophilicity and lyophobicity of particle surface is very important to control the interparticle interaction in aqueous solution. Through this interaction, we can precisely tune the formation of regular array, superlattice, made of nanoparticles to create new materials. We demonstrate the way of regulation of interparticle interaction, which is effective for the formation of high quality nanoparticle crystal at the gas/water interface. The reasons of creating a high quality superlattice at the gas/water interface are precisely explained. Some concrete examples of high quality superlattices are introduced and analyzed.