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Various functional nanoparticles and fibers with a diameter less than 100nm are now available for practical applications such as catalytic, electronic, optic, magnetic, cosmetic, and drug materials. To further increase functionality, control of size, morphology, etc. is now of great interest. In this lecture, after briefly introducing the dendritic aerosol deposition in fibrous filters under the guidance by Prof. Payatakes at the Univ. of Houston,(1) synthesis of controlled nanofiber mat for aerosol filtration, and (2) nanoparticle synthesis, dispersion and nanostructurization, will be introduced from our recent research. On the first subject, polymer nanofiber mats with various morphologies (nanofibers, beaded-nanofibers and composite particles/nanofibers) were prepared by electrospinning method. The filtration performance of various polymer nanofiber mats was evaluated based on the quality factors. The importance of …