Formation Of Bioactive Layer Research Articles

Morphology and structural studies of laser treated 45S5 bioactive glass

Osseointegration of an implant takes place when cells interact with implanted material, which depends on the surface and microstructural properties of the materials. In order to study the response of surface modified bioactive glasses in body fluid, glass samples with nominal composition (wt.%) 45SiO2–24.5CaO–24.5Na2O–6P2O5 are prepared by melt-quench technique and characterized for thermo-physical and structural properties. The glass samples are irradiated with nanosecond laser at different laser fluences. Structural and microstructural features of laser treated samples are investigated by Raman and scanning electron microscope. The morphology of laser treated glass samples has shown the formation of porous microstructure with pore size varying from 50nm to 2μm. In vitro testing of laser treated samples in simulated body fluid reveals a significant improvement in the formation of bioactive layer in comparison to untreated bioactive glass samples.

Biocompatible mechanical surface modification processing and mechanical properties of beta-type titanium alloys

Biocompatible mechanical surface modification processing and mechanical properties of beta-type titanium alloys

Preparation and studies on surface modifications of calcium-silico-phosphate ferrimagnetic glass-ceramics in simulated body fluid

The structure and magnetic behaviour of 34SiO 2–(45 − x) CaO–16P 2O 5–4.5 MgO–0.5 CaF 2 − x Fe 2O 3 (where x = 5, 10, 15, 20 wt.%) glasses have been investigated. Ferrimagnetic glass-ceramics are prepared by melt quench followed by controlled crystallization. The surface modification and dissolution behaviour of these glass-ceramics in simulated body fluid (SBF) have also been studied. Phase formation and magnetic behaviour have been studied using XRD and SQUID magnetometer. The room temperature Mössbauer study has been done to monitor the local environment around Fe cations and valence state of Fe ions. X-ray photoelectron spectroscopy (XPS) was used to study the surface modification in glass-ceramics when immersed in simulated body fluid. Formation of bioactive layer in SBF has been ascertained using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The SBF solutions were analyzed using an absorption spectrophotometer. The magnetic measurements indicated that all these glasses possess paramagnetic character and the [Fe 2+/Fe 3+] ions ratio depends on the composition of glass and varied with Fe 2O 3 concentration in glass matrix. In glass-ceramics saturation magnetization increases with increase in amount of Fe 2O 3. The nanostructure of hematite and magnetite is formed in the glass-ceramics with 15 and 20 wt.% Fe 2O 3, which is responsible for the magnetic property of these glass-ceramics. Introduction of Fe 2O 3 induces several modifications at the glass-ceramics surface when immersed in SBF solution and thereby affecting the surface dissolution and the formation of the bioactive layer.