3. Department of Pilot Nanobiotechnology, Pasteur Institute of Iran
Surface modification is the act of modifying the surface of a material by bringing physical, chemical or biological characteristics different from the ones originally found on the surface of a material. this modification is usually made to solid materials, but it is possible to find examples of the modification to the surface of specific liquids. the modification can be done by different methods with a view to altering a wide range of characteristics of the surface, such as: roughness, hydrophilicity, surface charge, surface energy, biocompatibility and reactivity. in this work we report the surface modification of nanofiber scaffolds chitosan by an atmospheric pressure plasma jet.
It was operated with helium gas using 13 kv, 35 khz, sine wave as an excitation source. the samples were exposed to the plasma jet effluent using a scanning procedure, which allowed achieving a uniform surface modification. the wettability assessments of all polymers reveal that the treatment leads to reduction of more than 40° in the water contact angle
Results of afm and ftir showed the incorporation of oxygen-related functional groups. afm shows differences between untreated and polymer surface treated with cold atmospheric plasma. these differences are in shape of topography and morphology of the surfaces.
Cold atmospheric plasma is a novel method for biomaterials surface modification