Uso de jato de plasma a pressão atmosférica para realizar modificações de superfícies do titânio

Abstract

Research for better performance materials in biomedical applications are constants. Thus recent studies aimed at the development of new techniques for modification of surfaces. The low pressure plasma has been highlighted for its versatility and for being environmentally friendly, achieving good results in the modification of physic chemical properties of materials. However, it is requires an expensive vacuum system and cannot able to generate superficial changes in specific regions. Furthermore, it is limits their use in polymeric materials and sensitive terms due to high process temperatures. Therefore, new techniques capable of generating cold plasma at atmospheric pressure (APPJ) were created. In order to perform surface treatments on biomaterials in specific regions was built a prototype capable of generating a cold plasma jet. The prototype plasma generator consists of a high voltage source, a support arm, sample port and a nozzle through which the ionized argon. The device was formed to a dielectric tube and two electrodes. The disc of titanium was polished and there was a surface modification. The surface modifications of titanium were analyzed. The energy consumed during the discharges was observed by the Lissajous figure method. The length of the jets was realized with Image Pro Plus software. The modifications of the titanium surfaces were observed by optical microscopy (OM) and atomic force microscopy (AFM). It was concluded that the plasma jet near room temperature and atmospheric pressure was able to cause modifications in titanium surface