The modulus formalism used in the dielectric analysis of hydroxyapatite and calcium phosphate with titanium formed by dry ball milling

Silva, C.C.; Graça, M.P.F.; Sombra, A. S. B.

doi:10.1016/j.jnoncrysol.2005.04.082

Cited by 33 publications

(17 citation statements)

References 14 publications

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“…The temperature dependence of the dc conductivity (Fig. 7) revealed that the samples do not show Arrhenius behavior, in the same region of temperature measurement, and a comparative analysis becomes difficult [28]. Nevertheless, this behavior, which is not a common ceramic conductivity behavior, suggests that the sample temperature is an important electrical parameter and probably modifies the sample structure, but in a reverse way.…”

Section: Resultsmentioning

confidence: 97%

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Microwave preparation, structure and electrical properties of calcium–sodium–phosphate biosystem

Silva

Graça

Góes

et al. 2006

Journal of Non-Crystalline Solids

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Section: Resultsmentioning

confidence: 97%

“…6). However, it must be pointed out that the measured dielectric values of the samples are higher than those of the commercial HAP (e 0 $ 5.8 [16,[27][28][29]). This behavior should be assigned to the presence, in these ceramics, of the amorphous phase.…”

Section: Resultsmentioning

confidence: 98%

Microwave preparation, structure and electrical properties of calcium–sodium–phosphate biosystem

Silva

Graça

Góes

et al. 2006

Journal of Non-Crystalline Solids

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“…Nevertheless, both XRD and SEM results reveal that the crystallites and particle sizes increase with the rise of the iron oxide concentration. The undoped hydroxyapatite, in the ceramic form, presents a ε′ ~ 11⋅09 (table 1) with crystallite size of ~ 20⋅63 ± 0⋅54 nm (Silva et al 2005(Silva et al , 2006. The HAP-Fe microscopic results (figure 5) show images with a strong variation of the microstructure with iron oxide concentration.…”

Section: Resultsmentioning

confidence: 96%

“…(Silva et al 2005)). This formalism, which minimizes the electro sample interface capacitance contribution at low frequencies, emphasizes small features at low frequencies, revealing that these samples do not present relaxation mechanisms in this frequency range.…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric properties of HAP are of interest because electromagnetic fields have been shown to accelerate healing in bone fractures. In addition, an interest in the dielectric properties of HAP stems from the suggestion that electrically insulating HAP coatings might be used on implantable devices (Timothy and Eldon 2002;Silva et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Dielectrical and structural characterization of iron oxide added to hydroxyapatite

et al. 2008

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In this work we report preparation, structural and dielectric analyses of iron oxide added in hydroxyapatite bioceramic (Ca 10 (PO 4 ) 6 (OH) 2 -HAP). Hydroxyapatite is the main mineral constituent of teeth and bones with excellent biocompatibility with hard and muscle tissues. The samples were prepared through a calcination procedure associated with dry high-energy ball milling process with different iron concentrations (1, 2⋅5 and 5 wt%). The dielectric analyses were made measuring the sample impedance in the frequency range 1 kHz-10 MHz, at room temperature. The relative permittivity of the ceramics, at 10 MHz, are between 7⋅13 ± 0⋅07 (1 wt%) and 6⋅20 ± 0⋅11 (5 wt%) while e″ are between 0⋅0795 ± 0⋅008 (1 wt%) and 0⋅067 ± 0⋅012 (5 wt%). These characteristics were related to the sample microstructures studied by X-ray diffraction and SEM.

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Design Strategies for Hydroxyapatite‐Based Materials to Enhance Their Catalytic Performance and Applicability

et al. 2023

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Hydroxyapatite (HAP) is a green catalyst that has a wide range of applications in catalysis due to its high flexibility and multifunctionality. These properties allow HAP to accommodate a large number of catalyst modifications that can selectively improve the catalytic performance in target reactions. To date, many studies have been conducted to elucidate the effect of HAP modification on the catalytic activities for various reactions. However, systematic design strategies for HAP catalysts are not established yet due to an incomplete understanding of underlying structure–activity relationships. In this review, tuning methods of HAP for improving the catalytic performance are discussed: 1) ionic composition change, 2) morphology control, 3) incorporation of other metal species, and 4) catalytic support engineering. Detailed mechanisms and effects of structural modulations on the catalytic performances for attaining the design insights of HAP catalysts are investigated. In addition, computational studies to understand catalytic reactions on HAP materials are also introduced. Finally, important areas for future research are highlighted.

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The modulus formalism used in the dielectric analysis of hydroxyapatite and calcium phosphate with titanium formed by dry ball milling

Cited by 33 publications

References 14 publications

Microwave preparation, structure and electrical properties of calcium–sodium–phosphate biosystem

Microwave preparation, structure and electrical properties of calcium–sodium–phosphate biosystem

Dielectrical and structural characterization of iron oxide added to hydroxyapatite

Design Strategies for Hydroxyapatite‐Based Materials to Enhance Their Catalytic Performance and Applicability

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