Improvement of Surface and Biocompatible Properties of Flexible Transparent Nano Tio2 Films Using Glow Discharge Plasma

K Navaneetha Pandiyaraj, R.R Deshmukh, B Shree Ram, R Mahendiran

Abstract


Low temperature plasma technology is playing a vital role to improve the surface properties of polymeric materials without affecting the bulk. Plasma processing is a dry state and contamination free reaction and hence it is preferred for processing of biomedical materials. Mechanical properties, light weight, mouldability to any complicated shape and flexibility of the polymers is the basis for its use in biomedical applications. However, many polymers have adverse surface properties. In this present work, surface property of nano TiO2 films were modified by rf glow discharge plasma. The changes in surface properties of the materials were investigated as a function of exposure time with the constant pressure of 0.15mbar and 30 watt power. The surface hydrophilicity of TiO2/PET films was analyzed by contact angle measurements with three testing liquids and also investigated the surface free energy of the materials using Fowke’s approximation.

 

X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) were used to analyze the extent of modification of both the chemical composition and surface topography of plasma treated TiO2 films. The percentage of transmittance of plasma treated TiO2 films was analyzed by UV-Visible spectrophotometer. The interfacial tension between plasma treated TiO2 films and biological fluid was also investigated. Antibacterial activities of surface modified TiO2/PET films were analyzed against staphylococcus bacteria for incubation time of 24Hr. It was found that the surface properties of nano TiO2 films improved significantly by the treatment.  The surface modified nano films showed inhibited bacterial adhesion and activation.  It also resists the formation of thrombus on the surfaces.


Keywords


RF plasma treatment, TiO2, surface properties, bacterial activity.

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