New sintered wollastonite glass-ceramic for biomedical applications

Soares, Viviane Oliveira; Daguano, Juliana Kelmy Macário Barboza; Lombello, Christiane Bertachini; Bianchin, Olavo S; Gonçalves, Lívia M.G.; Zanotto, Edgar Dutra

doi:10.1016/j.ceramint.2018.07.275

Cited by 21 publications

(11 citation statements)

References 27 publications

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“…The XRD pattern of the NiO/Na 4.2 Ca 2.8 (Si 6 O 18 ) composite prepared from the chitosan precursor indicates the formation of NiO inside the glass Na 4.2 Ca 2.8 (Si 6 O 18 ) (see Figure 5 a). The XRD pattern is in agreement with those reported in the literature [ 13 , 14 , 15 ]. The observed morphology is similar to the one previously reported [ 13 , 14 , 15 ] (see Figure 5 b,c), also presenting a uniform distribution of NiO inside the Na 4.2 Ca 2.8 (Si 6 O 18 ) ( Figure 5 d).…”

Section: Resultssupporting

confidence: 91%

“…The XRD pattern is in agreement with those reported in the literature [ 13 , 14 , 15 ]. The observed morphology is similar to the one previously reported [ 13 , 14 , 15 ] (see Figure 5 b,c), also presenting a uniform distribution of NiO inside the Na 4.2 Ca 2.8 (Si 6 O 18 ) ( Figure 5 d). Similar conclusions can be deduced for the PVP precursor (see Supplementary Materials, Figure S4 ).…”

Section: Resultssupporting

confidence: 91%

“…The Na 4.2 Ca 2.8 (Si 6 O 18 ) compound (combeite) is a crystalline phase normally obtained from the fusion of precursor Na 2 O⋅CaO⋅SiO 2 glasses [ 13 , 14 , 15 ]. In this sense, there are no reported metal oxides using Na 4.2 Ca 2.8 (Si 6 O 18 ) as a solid matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, this solid state method has been used for other systems [ 31 ]. A summary of the proposed fabrication route is shown in Figure 1 [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

et al. 2020

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The medium effect of the optical and catalytic degradation of methylene blue was studied in the NiO/SiO2, NiO/TiO2, NiO/Al2O3, and NiO/Na4.2Ca2.8(Si6O18) composites, which were prepared by a solid-state method. The new composites were characterized by XRD (X-ray diffraction of powder), SEM/EDS, TEM, and HR-TEM. The size of the NiO nanoparticles obtained from the PSP-4-PVP (polyvinylpyrrolidone) precursors inside the different matrices follow the order of SiO2 > TiO2 > Al2O3. However, NiO nanoparticles obtained from the chitosan precursor does not present an effect on the particle size. It was found that the medium effect of the matrices (SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18)) on the photocatalytic methylene blue degradation, can be described as a specific interaction of the NiO material acting as a semiconductor with the MxOy materials through a possible p-n junction. The highest catalytic activity was found for the TiO2 and glass composites where a favorable p-n junction was formed. The isolating character of Al2O3 and SiO2 and their non-semiconductor behavior preclude this interaction to form a p-n junction, and thus a lower catalytic activity. NiO/SiO2 and NiO/Na4.2Ca2.8(Si6O18) showed a similar photocatalytic behavior. On the other hand, the effect of the matrix on the optical properties for the NiO/SiO2, NiO/TiO2, NiO/Al2O3, and NiO/Na4.2Ca2.8(Si6O18) composites can be described by the different dielectric constants of the SiO2, TiO2, Al2O3, Na4.2Ca2.8(Si6O18) matrices. The maxima absorption of the composites (λmax) exhibit a direct relationship with the dielectric constants, while their semiconductor bandgap (Eg) present an inverse relationship with the dielectric constants. A direct relationship between λmax and Eg was found from these correlations. The effect of the polymer precursor on the particle size can explain some deviations from this relationship, as the correlation between the particle size and absorption is well known. Finally, the NiO/Na4.2Ca2.8(Si6O18) composite was reported in this work for the first time.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

“…Furthermore, this solid state method has been used for other systems [ 31 ]. A summary of the proposed fabrication route is shown in Figure 1 [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

et al. 2020

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“…It has as its natural representative a characteristic white mineral and is widely used as a precursor (raw material) in inorganic syntheses, mainly those carried out by solid state reactions 35 . It has numerous applications and is frequently used in the glass-ceramic form, in coatings in civil construction or in biomedicine (bone implants) 36,37 . These well-known applications motivated research on several families of glass-ceramics with wollastonite as a component, such as CaTiO 3 -CaSiO 3 .…”

mentioning

confidence: 99%

Crystallization Kinetics and Structure Refinement of CaTiO3 Glass-Ceramics Produced by Melt-Quenching Technique

et al. 2021

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Glass-ceramic materials were obtained by heat treatment (960 ºC for 2, 4, and 6 hs) of glasses with CaCO 3 47.50 wt%-TiO 2 23.75 wt%-SiO 2 23.75-Al 2 O 3 5.00 wt% formulation produced by the melt-quenching technique (melting at 1650 ºC and subsequent annealing at 650 ºC). The materials' structural characterization and crystallization kinetics (Kissinger method) indicate the presence of CaTiO 3 , CaSiO 3, and CaTiSiO 5 crystalline phases with activation energies 217, 281, and 446 kJ/mol, respectively. The structure refinement (Rietveld method) suggests metastability for the CaSiO 3 and CaTiSiO 5 phases as a function of the heat treatment time. The increase in time favors CaTiO 3 crystallization, from 62.97 wt%, in the 2 hs treated sample, to 79.21 wt%, in the 6 hs treated sample. EDS and microstructure analyses confirm the glass-ceramic production and indicate segregation of the CaTiO 3 phase for longer heat treatment times.

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Mineralogy and Properties of Raw Materials and Crystalline Phases of Ceramics and Glass–Ceramics

Tomalino

2021

PoliTO Springer Series

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New sintered wollastonite glass-ceramic for biomedical applications

Cited by 21 publications

References 27 publications

Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

Crystallization Kinetics and Structure Refinement of CaTiO3 Glass-Ceramics Produced by Melt-Quenching Technique

Mineralogy and Properties of Raw Materials and Crystalline Phases of Ceramics and Glass–Ceramics

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