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Tõnsuaadu, Kaia; Peld, Merike; Bender, V. E.; Veiderma, Mihkel

doi:10.1023/a:1010118905445

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…2) of Ru-modified HAps (HAp 110 , HAp 24 ) exothermic events with maxima at 214 and 323 • C appear, being the result of structural reorganization with evolvement of water [1]. The last peak is shifted to lower temperatures as a result of Ru sorption with apatite, which is characteristic for heavy metal-modified HAp [24]. In the DTA curve of Ru-FAp an exothermic event appears at 682 • C, indicating a structural change in the new phase formed in the reaction of RuCl 3 with FAp.…”

Section: Thermal Analysismentioning

confidence: 99%

A new glance at ruthenium sorption mechanism on hydroxy, carbonate, and fluor apatites: Analytical and structural studies

Tõnsuaadu¹,

Gruselle²,

Villain³

et al. 2006

Journal of Colloid and Interface Science

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Section: Thermal Analysismentioning

confidence: 99%

A new glance at ruthenium sorption mechanism on hydroxy, carbonate, and fluor apatites: Analytical and structural studies

Tõnsuaadu¹,

Gruselle²,

Villain³

et al. 2006

Journal of Colloid and Interface Science

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“…The phase transformation of amorphous phase to crystalline hydroxyapatite was reported by K. Gross 34 . Furthermore, previous studies showed that in the temperature range from 600 °C to 1000 °C cHAP loses a major part of its carbonate 35 . Other weight loss observed between 1150-1250 ºC is less significant, but small exothermic peaks in the DTA curve (maxima at 1180 and 1280 ºC) are initiated due to decomposition of cHAP and possible formation of CaO and other secondary phases in the material.…”

Section: Evaluation Of Sintering Temperaturementioning

confidence: 99%

Fabrication of a composite of nanocrystalline carbonated hydroxyapatite (cHAP) with polylactic acid (PLA) and its surface topographical structuring with direct laser writing (DLW)

et al. 2016

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The fabrication of polylactic acid (PLA)-carbonated hydroxyapatite (cHAP) composite material from synthesised phase pure nano-cHAP and melted PLA by mechanical mixing at 220-235 °C has been developed in this study. Topographical structuring of PLA-cHAP composite surfaces was performed by direct laser writing (DLW). Microstructured surfaces and the apatite distribution within the composite and formed grooves were evaluated by optical and scanning electron microscopies. The influence of the dopant concentration as well as the laser power and translation velocity on the composite surface morphology is discussed. The synthesis of carbonated hydroxyapatite (cHAP) nanocrystalline powders via wet chemistry approach from calcium acetate and diammonium hydrogen phosphate precursors together with crosslinking and complexing agents of polyethylene glycol, poly(vinyl alcohol) and triethanolamine is also reported.Thermal decomposition of the gels and formation of nanocrystalline cHAP were evaluated by thermal analysis, mass spectrometry and dilatometry measurements. The effect of organic additives on the formation and morphological features of cHAP was investigated. The phase purity and crystallinity of the carbonated apatite powders were evaluated by X-ray diffraction analysis and FT-IR spectroscopy.2

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“…26 Figure 1 shows the result of a thermogravimetric analysis conducted on two different types of as dried gel obtained from solution, without performing the aging time and with 24 h aging time. Both of the sample groups (without aging time and with 24 h aging time) showed three weight losses, as it could be seen in TGA curves (Fig.…”

Section: Resultsmentioning

confidence: 99%

Sol–gel derived nanostructure hydroxyapatite powder and coating: aging time optimisation

Fathi

Hanifi

2009

Advances in Applied Ceramics

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The aim of this work was to evaluate the effect of aging time on the formation and phase purity of nanostructure hydroxyapatite powder and coating. Hydroxyapatite powder and coating were prepared by sol-gel method using calcium nitrate and phosphorous pentoxide as starting materials. Precursor sols were dip coated onto the pure titanium substrates. The coated plates were aged in different aging times and dried. Finally, samples were calcinated at 600 and 700uC. Thermal behaviour, phase formation, surface morphology and interfacial coherency were investigated by thermogravitometry analysis, X-ray diffraction and scanning electron microscope. Results showed that a solution aging time of at least 24 h was required to achieve monophasic nanostructure hydroxyapatite powder and coating. Hydroxyapatite structure of coating was obtained at 600uC, and a b-tricalcium phosphate phase was formed at 700uC. The effect of sintering temperatures on crystallite size of the coatings was not significant.

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Untitled

Cited by 12 publications

References 6 publications

A new glance at ruthenium sorption mechanism on hydroxy, carbonate, and fluor apatites: Analytical and structural studies

A new glance at ruthenium sorption mechanism on hydroxy, carbonate, and fluor apatites: Analytical and structural studies

Fabrication of a composite of nanocrystalline carbonated hydroxyapatite (cHAP) with polylactic acid (PLA) and its surface topographical structuring with direct laser writing (DLW)

Sol–gel derived nanostructure hydroxyapatite powder and coating: aging time optimisation

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