Enhancement in the induction heating efficacy of sol–gel derived SiO₂–CaO–Na₂O–P₂O₅ bioglass-ceramics by incorporating magnetite nanoparticles

Abstract

Magnetite (Fe3O4) nanoparticle (MNP) substituted glass-ceramic (MSGC) powders with compositions of (45-x)SiO2-24.5CaO-24.5Na2O-6P2O5-xFe3O4 (x = 5, 8, and 10 wt. %) have been prepared by sol-gel route by introducing Fe3O4 nanoparticles...

Enhancement of induction heating capability of bioactive SiO2–CaO–Na2O–P2O5 glass-ceramics by selective substitution with magnetite nanoparticles

“…It can be observed that some researchers have solely focused on magnetic properties, while a few others have extensively investigated bioactivity and heating capacity of these ceramics. One can also notice that except [3,6]., all the studied compositions deviated from the Hench composition.…”

“…At T A > 550 • C, conversion of magnetite into hematite could be noticed along with further reduction in NaNO 3 phase [6]. Since, the presence of hematite degrades the magnetic properties, the optimum T A appears to be 550 • C. It may also be noted that combeite does not impede the formation of hydroxyapatite layer (HAp) under physiological conditions, and hence the bioactivity of the sample remains unaffected [20].…”

Impact of Iron Oxide Phases on the Magnetic Induction Heating Capacity of Mesoporous 45SiO2–16.5CaO–24.5Na2O–6P2O5–8Fe3O4 Glass-Ceramics

“…Higher SAR indicates increased power absorption by the material and, hence, an improved heating efficiency. SAR can be estimated by employing the initial slope method (ISM) and the Box Lucas method (BLM) techniques. , The BLM technique takes into account the entire heating curve, while the ISM method focuses on only the initial slope. Therefore, the latter is considered to be more relevant for this investigation.…”

“…Therefore, the latter is considered to be more relevant for this investigation. The increase in temperature (Δ T ) was estimated using eq , normalΔ T = A ( 1 − e ( − B Δ T ) ) In the above expression, A and B represent the fitting parameters. Then, the SAR was computed by employing eq SAR = italicAB C v m i m Np In eq , m Np , m i , and C v represent the mass of MGCC powder, the entire mass of the magnetic fluid, and the specific heat capacity of the aqueous solvent, respectively.…”

“…The review emphasized the need for an organized investigation of both magnetic and bioactive properties of MGC for developing efficient thermoseeds for MHT . The nanopowder form of MGC is preferred over the bulk counterpart due to the former’s enhanced surface-related properties. , We have recently prepared and investigated the properties of Fe 2 O 3 and Fe 3 O 4 nanoparticles substitution for SiO 2 up to 15 wt % in the 45SiO 2 –24.5CaO–24.5Na 2 O–6P 2 O 5 glass. ,, Ur Rahman et al also discussed the potential of the 7Fe 3 O 4 –51SiO 2 –18CaO–20Na 2 O–4P 2 O 5 ceramic containing magnetite phase . Singh et al identified three crystalline phases, viz., combeite, wollastonite, and magnetite, in the bulk SiO 2 –CaO–Na 2 O–P 2 O 5 –Fe 2 O 3 glass-ceramic and found that their relative percentages varied with Fe 2 O 3 concentration. , The available literature on the SiO 2 –CaO-Na 2 O–P 2 O 5 –Fe 3 O 4 glass-ceramics, although profound, does not reveal the role of different magnetic phases present and their relative percentages on the interaction between the Fe ions in the ceramic network or their impact on their induction heating capacity.…”