De nanopartículas a nanocamada compacta : recobrimento de partículas em forma de pó pelo processo de PVD

Abstract

Nanostructured coatings have become a subject of great interest in the industry, due to the possibilities of obtaining materials with unique physicochemical properties. This increment of properties gives improvements in features and functions such as electronics, catalytic, chemical, magnetic, mechanical, etc. The coating of flat surfaces by the magneto sputtering technique is quite common in the industry - glass coatings and metallic materials - but the use of this technique for surface coating of dust particles is still new. The present work seeks from the knowledge of deposition (PVD), to cover polymethylmethacrylate (PMMA) microspheres with a silver nanometer layer. The thickness of this coating ranged from nanoparticles on the dust surface (welldistributed island formation) to the formation of a homogeneous compact nanolayer. Because it is a process that uses a physical deposition route, the process is clean, reproductive and inexpensive, making it possible to be applied in the most varied branches of industry. Silver layers on PMMA microspheres (PMMA-Ag) were produced and characterized by the following techniques: UV-Vis, RBS, FEG and TEM.