A calorimetric study of the temperature effect on Calcium Phosphate precipitation

Mitsionis, Anastasios; Vaimakis, T.

doi:10.1007/s10973-009-0357-0

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…The latter could be due to the higher content of DCPD and DCPA present in this solid, as found in TG analysis [25][26][27]. At 400°C, particles of sheet-like structure remained because DCPA decomposed at a higher temperature (about 430°C) [28,29]. At 600°C, a transformation on the surface of particles was also observed, which was related to the chemical reactions, with the disappearance of DCPD, DCPA, and calcite, and the formation of calcium pyrophosphate and calcium oxide as new intermediates (Fig.…”

Section: Specific Surface Area and True Densitymentioning

confidence: 79%

Thermal behavior of apatitic calcium phosphates synthesized from calcium carbonate and orthophosphoric acid or potassium dihydrogen orthophosphate

Minh

Martı́nez

Nzihou

et al. 2012

J Therm Anal Calorim

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The synthesis of calcium hydroxyapatite powder (Ca-HA) from orthophosphoric acid or from potassium dihydrogen orthophosphate and calcium carbonate was carried out under moderate conditions. A better dissolution of calcium carbonate and a complete precipitation of the orthophosphate species were obtained with orthophosphoric acid, indicating that it may be of interest as a phosphate source compared with potassium dihydrogen orthophosphate. The influence of calcination treatment on the physico-chemical properties of the solids is discussed in this paper. Different characterization techniques such as specific surface area (S BET), true density, particle size distribution, thermo-mechanical analysis, simultaneous thermogravimetry and differential scanning calorimetry analysis, X-ray diffraction and infrared were performed to understand the phase changes during thermal treatment. Specific surface area decreased while true density and particle size increased with the rise in the calcination temperature, due to the sintering of particles and the chemical reactions occurring at high temperatures. Mixtures of well-crystallized Ca-HA and tricalcium phosphate (TCP) or well-crystallized Ca-HA, CaO, and TCP were obtained after calcination at 800-1,000°C of the solid products starting from orthophosphoric acid or potassium dihydrogen orthophosphate, respectively.

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Section: Specific Surface Area and True Densitymentioning

confidence: 79%

Thermal behavior of apatitic calcium phosphates synthesized from calcium carbonate and orthophosphoric acid or potassium dihydrogen orthophosphate

Minh

Martı́nez

Nzihou

et al. 2012

J Therm Anal Calorim

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“…In the FTIR spectrum of the Ca 3 (PO 4 ) 2 -ABB6B hybrid ( Figure 6 ), characteristic ABB6B and Ca 3 (PO 4 ) 2 adsorption peaks can be found, e.g., the -CH 2 vibration peaks of ABB6B at 2975 and 2926 cm −1 , benzene ring ones at 1581 and 1508 cm −1 , –CH 3 at 1374 cm −1 , C-N at 1346 cm −1 , and -SO 3 2 at 1176 cm −1 , and the PO 4 3− vibration peaks of Ca 3 (PO 4 ) 2 at 1032, 603 and 562 cm −1 [ 16 ]. These characteristic adsorption peaks of ABB6B and Ca 3 (PO 4 ) 2 can also be observed in the Ca 3 (PO 4 ) 2 /ABB6B mixture.…”

Section: Resultsmentioning

confidence: 99%

Synthetic Dye - Inorganic Salt Hybrid Colorants for Application in Thermoplastics

2011

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Common synthetic dyes, e.g., Weak Acid Pink Red B (APRB, C.I. 18073), Mordant Blue 9 (MB, C.I.14855) and Acid Brilliant Blue 6B (ABB6B, C.I. 42660), can be removed from water by in situ hybridization with CaCO3, BaSO4 and Ca3(PO4)2 and the resulting hybrids thus prepared used as plastic colorants. All the hybrids can be processed into polypropylene (PP) at 200 °C with good color intensity, color brightness and homogeneous dispersion. The BaSO4-MB hybrid exhibits better migration resistance to acid and alkali, and stronger covering power than the BaSO4-MB mixture. The thermal stability and UV resistance of the Ca3(PO4)2-ABB6B hybrid are better than those of the Ca3(PO4)2-ABB6B mixture. The crystallinity of PP is enhanced by incorporation of these hybrids and the use of these hybrids as colorants in PP instead of the dyes alone is determined to be feasible.

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“…The second one and last one are associated with dehydration-crystallization. These processes have been studied by other authors [38][39][40]. However, practically no efort has been dedicated to study the inluence of the experimental conditions used for the thermal decomposition on the morphology of the inal products.…”

Section: Characterization Of the Powders Of Hydroxyapatitementioning

confidence: 99%

Controlled Rate Thermal Analysis (CRTA) as New Method to Control the Specific Surface in Hydroxyapatite Thin Coatings

Peón¹,

hadad²,

García-Galván³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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The control of the texture in synthetic hydroxyapatite ceramics had limited their application in the ield of the materials for bone implantation, even more when it is used as a illing in cements and other formulations in orthopedic surgery. The present article shows preliminary results demonstrating the efectiveness of a modiication of the controlled rate thermal analysis (CRTA), developed by J. Rouquerol, used for the preparation of ceramic materials with controlled textural characteristics, during the formation of ceramic powders of synthetic hydroxyapatite at low temperatures. The thermal treatments of the hydroxyapatite were carried out in a device connected to a computer, to control temperature and pressure system, keeping the decomposition speed constant. Results, reported when preparing ceramic powders of hydroxyapatite at 300 and 850°C under controlled pressure, using synthetic hydroxyapatite with a Ca/P molar ratio equal to 1.64, were checked using IR spectroscopy and X-ray difraction, showed that the formed phase corresponds to that of crystalline hydroxyapatite, even at 300°C of maximum temperature. Values of speciic surface (BET) between 17 and 66 m 2 /g, with pore size in the range of 50-300 Å in both cases are obtained by N 2 absorption isotherms, when analyzing the isotherms of nitrogen absorption.

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A calorimetric study of the temperature effect on Calcium Phosphate precipitation

Cited by 15 publications

References 13 publications

Thermal behavior of apatitic calcium phosphates synthesized from calcium carbonate and orthophosphoric acid or potassium dihydrogen orthophosphate

Thermal behavior of apatitic calcium phosphates synthesized from calcium carbonate and orthophosphoric acid or potassium dihydrogen orthophosphate

Synthetic Dye - Inorganic Salt Hybrid Colorants for Application in Thermoplastics

Controlled Rate Thermal Analysis (CRTA) as New Method to Control the Specific Surface in Hydroxyapatite Thin Coatings

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