Abstract
This paper reports the dielectric and photoluminescence measurements of ossiointegrated strontium doped hydroxyapatite bioceramic. The study on invitro bioactivity of Sr-HAp is carried out by using modified simulated body fluid. Dielectric properties of these ossiointegrated samples are studied in the frequency range 10 Hz to 1 MHz at room temperature. Dielectric constant is found to be decreasing with increase in incubation period and frequency of applied ac field. Higher the period of incubation and applied ac frequency, higher is the dielectric loss. AC conductivity shows frequency independent behaviour for all samples in lower frequency region and then increases linearly with increase in frequency. Sample incubated for longer duration shows higher conductivity. The optical properties of incubated Sr-HAp samples are also investigated with photoluminescence (PL) technique. The PL study shows the blue emission at around 476 nm when excited at 409 nm. The PL in tensity increases with increase in incubation duration and Sr-substitution.
Highlights
Hydroxyapatite bioceramic (HAp:Ca10(PO4)6(OH)2) is one of the attractive member of calcium phosphate family having same mineral composition as that of calcified tissues of vertebrates
This paper reports the dielectric and photoluminescence measurements of ossiointegrated strontium doped hydroxyapatite bioceramic
The XRD profiles of incubated Sr-HAp samples show that hydroxyapatite structure is retained by all samples during incubation in m-Simulated Body Fluid (SBF)
Summary
Hydroxyapatite bioceramic (HAp:Ca10(PO4)6(OH)2) is one of the attractive member of calcium phosphate family having same mineral composition as that of calcified tissues of vertebrates It promotes the new bone formation and attach directly to living tissue chemically via formation of biologically active apatite layer, leading to interfacial bonding [1,2]. It is worth to carry out study on electric and dielectric properties of HAp to have better understanding of electrical and biological phenomena. From this point of view, complex impedance spectroscopy technique is an appropriate approach to investigate the electrical properties of hydroxyapatite material. These studies describe dielectric behaviour of pure HAp, ion exchanged HAp and HAp based composites and dependence of dielectric constant on sintering temperature and porosity [10,18,19,20,21,22,23,24]
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