Electrical Potential and Topography of the Surface of a Calcium-Phosphate Coating Deposited with RF-Magnetron Discharge

Abstract —Research into the correlations of the surface electric potential of electret calcium-phosphate coatings formed by RF-magnetron sputtering and the surface topography are performed. It is determined that the electric potential over the coating surface has irregular distribution. The highest value of the potential is localized in the region near structural elements (vertices) with a higher peak sharpness value. The spots on the coating surface having a maximum potential within the range of 670–900 mV correspond to a profile of points with heights in the range of 77−326 nm. The higher values of the electron work function of the surface of the coating as compared to a titanium surface without the coating correspond to enhancement of the adhesion effect of osteoblasts and osteoclasts to the surface of the calcium-phosphate coatings.