Trap state spectroscopy studies and wettability modification of hydroxyapatite nanobioceramics

Abstract

Sintered hydroxyapatite coatings on titanium-based implants demonstrate beneficial biocompatibility and osteoconductivity. It has been shown that charged surface states and bulk traps located in the vicinity of the surface of the hydroxyapatite coatings strongly influence wettability properties of the hydroxyapatite and may modify biocompatibility of these nanostructured bioceramics. Combination of high-resolution electron state spectroscopy methods, thermostimulated exoelectron emission, and thermoluminescence methods, applied in this work, have allowed studying electron trap energy spectrum of the hydroxyapatite bioceramics.

Application of atomic force microscopy methods for testing the surface parameters of coatings of medical implants

“…Moreover, a part of the flaws are electron-hole trapping centers that carry elec tric charges. As a result of different mobilities of electrons and holes, these localized charges participate in the formation of a double electrical layer and may change the surface potential [15]. As a whole, it can be concluded that CP coatings formed by the RFMS method have a positive surface potential, thus conform ing to the data from [16].…”

Scaffold Materials Based on Fluorocarbon Composites Modified with RF Magnetron Sputtering

“…Moreover, part of defects are the centers of electron -hole capture bearing electrical charge. Owing to various mobility of electrons and holes these localized charges take part in formation of double electric layer and can change surface potential (Aronov & Rosenman, 2007). In general, we can conclude that CaP coatings formed by the RFMS have positive surface potential that is conformed to article (Khlusov et al, 2011).…”

The formation of calcium phosphate coatings by pulse laser deposition on the surface of polymeric ferroelectric

“…3 b, d, f). The positive shift of the potential is possibly due to the fact that CaP nanostructured coating is a p-type semiconductor with a wide band gap (~ 4 eV) and a high defect density [48]. The high defect density makes it possible to change the surface potential of the coatings with an external polarization or irradiation with low-energy electrons to further stimulate osteoblast adhesion to the surface [49,50] The chemical composition of the surface is also an important characteristic of a biocompatible material.…”