The seeded growth of calcium phosphates. The kinetics of growth of dicalcium phosphate dihydrate on hydroxyapatite

Barone, J. P.; Nancollas, G.H.; Tomson, Mason B.

doi:10.1007/bf02547394

Cited by 27 publications

(7 citation statements)

References 18 publications

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“…Remineralization may occur by formation of DCPD, even though the solutions are supersaturated with respect to OHA and FAP. This is in accordance with the findings reported by Barone et al [1976] and Barone and Nancollas [1978a, b], Barone et al [1976] reported DCPD formation and no OHA formation at pH 5.0 within 24 h, indicating that even though the solu tions at acid pH were supersaturated with respect to OHA, no direct OHA formation was observed.…”

Section: Discussionsupporting

confidence: 82%

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Influence of Fluoride and pH on in vitro Remineralization of Bovine Enamel

Lammers¹,

Borggreven²,

Driessens³

1992

Caries Res

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Subsurface lesions in bovine enamel slices were remineralized. The remineralization solutions contained either 0.03,0.3, or 1.0 ppm fluoride at either pH 5.5 or 6.8. The amount of remineralization was determined after periods of up to 610 h, using quantitative microradiography. The results showed that after 126 h of remineralization in the presence of 0.03 ppm fluoride significantly (p < 0.05) more remineralization occurred at pH 6.8 than at pH 5.5. At 0.3 and 1.0 ppm fluoride no significant differences between pH 5.5 and pH 6.8 were observed. An interaction between fluoride and pH was observed. The observed differences in the rates of remineralization are explained by the formation and subsequent transformation of the precursors octacalcium phosphate (pH 6.8) and brushite (pH 5.5) into (fluor)apatites.

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Section: Discussionsupporting

confidence: 82%

“…Depending on the type of foods consumed [Jensen and Schachtele, 1983], the pH of the plaque may reach a value of about 5-6 for some time. The question is whether remineralization may occur at such pH values, although crystal growth studies showed that precipitation is possible [Barone et al, 1976;Barone and Nancollas, 1978a, b].…”

mentioning

confidence: 99%

Influence of Fluoride and pH on in vitro Remineralization of Bovine Enamel

Lammers¹,

Borggreven²,

Driessens³

1992

Caries Res

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“…Preparation studies have covered a wide range of compositions and experimental conditions, 4–10 with wet chemical precipitation being a relatively easy procedure for the mass production of HA whiskers or fibrous HA. However, as both structure and properties are very sensitive to the preparation conditions, HA is sometimes not formed directly, with precursors such as dicalcium phosphate dihydrate (CaHPO 4 ·2H 2 O, DCPD) and octacalcium phosphate (Ca 8 H 2 (PO 4 ) 6 ·5H 2 O, OCP) being formed first 11,12 . The constitution and morphology of whiskers are affected by the pH of solution, the type and concentration of additives, and the transformation of such precursors 4,10,13 .…”

Section: Introductionmentioning

confidence: 99%

“…However, as both structure and properties are very sensitive to the preparation conditions, HA is sometimes not formed directly, with precursors such as dicalcium phosphate dihydrate (CaHPO 4 Á 2H 2 O, DCPD) and octacalcium phosphate (Ca 8 H 2 (PO 4 ) 6 Á 5H 2 O, OCP) being formed first. 11,12 The constitution and morphology of whiskers are affected by the pH of solution, the type and concentration of additives, and the transformation of such precursors. 4,10,13 In the case of the so-called ''hydrolysis'' method, using acidic calcium phosphate under both normal and hydrothermal conditions, the morphology was found to be greatly influenced by the transformation of these precursors to HA; plate-like particles always accompanied the fine HA whiskers, resulting in calcium-deficient HA with low Ca/P and irregular morphology.…”

Section: Introductionmentioning

confidence: 99%

Formation of Hydroxyapatite Whiskers by Hydrothermal Homogeneous Precipitation Using Acetamide

Zhang

Darvell

2011

Journal of the American Ceramic Society

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Well‐crystallized, compositionally homogeneous HA whiskers with uniform morphology and high aspect ratio were successfully prepared by hydrothermal homogeneous precipitation from aqueous solution using acetamide (AA). The product had a mean length of 116 μm and an aspect ratio of 102. The nucleation and crystal growth of such whiskers were studied by quenching the solution from various temperatures. It was found that the nuclei could be formed at about 120°C, while stable and well‐grown whisker‐like precipitation only occurred above 140°C. The product had the same crystallographic characteristics as normal HA crystals. No other phase than HA was detected. Compared with widely used wet chemical routes, the slow hydrolysis of AA provided a stable and continuous growth environment with a low degree of supersaturation, facilitating rapid growth of long HA whiskers directly from a hydrothermal solution, free of any interference from other phases. The whiskers showed spiral growth, with preferential c‐axis orientation.

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“…Barone et al (1976) observed a precipitation of DCPD onto the HAP seed crystals. Frèche and Heughebaert (1989) observed the precipitation of OCP and DCPD onto the seed crystals of OCP and DCPD, but no HAP precipitation was observed.…”

Section: Introductionmentioning

confidence: 93%

Thermodynamic Assessment of Effects of Solution Conditions on Precipitation and Recovery of Phosphorus from Wastewater

Song

QianFeng

GaoYing

et al. 2015

Environmental Engineering Science

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Chemical modeling calculations and batch tests were carried out to investigate the effect of solution chemistry on formation of phosphate precipitation in synthetic flushed dairy manure wastewater for phosphorus recovery. Saturation index (SI) of different calcium phosphate precipitates in solution with a PO 4 3 -concentration range of 0.032-9.8 mM (1-300 mg P/L), Ca/P molar ratio of 1-20, pH value of 5.0-12.0, and the CO 3 2 -concentration of 0-100 mM was calculated separately using the geochemical aquatic modeling program, PHREEQC. Results show that the SI of calcium phosphate is the logarithmic function of Ca 2 + and PO 4 3 -concentration, increasing with the increase of Ca 2 + and PO 4 3 -concentrations. SI of calcium phosphate is the polynomial function of the solution pH value. SIs of hydroxyapatite (HAP) and tricalcium phosphate (TCP) increase with the growth of the pH value, while the SIs of octacalcium phosphate (OCP) and dicalcium phosphate dehydrate (DCPD) reach the maximum value at pH 9.0-9.5 and 7.0-7.5, respectively. The SI of calcium phosphate decreases with the growth of the CO 3 2 -concentration following a linear function pattern. Meanwhile, the SI of calcium phosphate decreases with growth of ionic strength following a logarithmic function pattern. In the case study of phosphate removal from synthetic flushed dairy manure wastewater, the PO 4 3 -removal trend under a different pH value and Ca/P molar ratios was closer to the predictions of thermodynamic modeling. CO 3 2 -can affect the PO 4 3 -removal efficiency and turn on the marked inhibiting effect on HAP growth, but does not obviously affect the structure of the precipitate.

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The seeded growth of calcium phosphates. The kinetics of growth of dicalcium phosphate dihydrate on hydroxyapatite

Cited by 27 publications

References 18 publications

Influence of Fluoride and pH on in vitro Remineralization of Bovine Enamel

Influence of Fluoride and pH on in vitro Remineralization of Bovine Enamel

Formation of Hydroxyapatite Whiskers by Hydrothermal Homogeneous Precipitation Using Acetamide

Thermodynamic Assessment of Effects of Solution Conditions on Precipitation and Recovery of Phosphorus from Wastewater

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