Segregation and Formation of Silver Nanoparticles Created In situ in Polyvinyl alcohol Films. 1- Introduction. Preparation, characterization, and physical properties of a nanostructured materials of silver (nanoparticles and nanocomposites) have been the subject of various researcher in many scientific laboratories during the past years for many studies and it has been also established that size, stability, color, shape, and properties depend on the method of preparation (radiation, photochemical