Electrospraying and electrospinning processes were employed for the production of nanocoMposite material of polymer nanofibers blended with nanoparticles. The diameter of polymer nanofibers made of PVC, PSU or nylon was smaller than 500 nm. Metal oxide nanoparticles of TiO2, MgO, and Al2O3 of the size 20-100 nm suspended in methanol were deposited oil the polymer nanofibers. Three configurations of electrospray/electrospun nozzles used for the nanocomposite production were tested: 1. simultaneous electrospraying during the electrospinning process, 2. electrospraying onto the same rotating drum after the electrospinning is completed, and 3. electrospraying onto the electrospun mat removed from the drum and placed onto a heated table. (C) 2009 Elsevier B.V. All rights reserved.