Crystal habit and growth conditions of brushite, CaHPO4 ⋅ 2H2O

Abbona, F.; Christensson, Finn; Angela, M.; Madsen, Henrik Breuning

doi:10.1016/0022-0248(93)90183-w

Cited by 71 publications

(61 citation statements)

References 20 publications

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“…3(b)]. 15 We suspect the aggregate structure of the deposit is due to the presence of hydrogen bubbles released at the cathode. This conjecture is supported by the fact that the pores and buildup appear to be fairly rounded, as if the deposit was formed around residing gas bubbles.…”

Section: Resultsmentioning

confidence: 98%

Electrodeposition of brushite coatings and their transformation to hydroxyapatite in aqueous solutions

Kumar¹,

Dasarathy²,

Riley³

1999

J. Biomed. Mater. Res.

140

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In this study we examine the potential for using brushite (dicalcium phosphate dihydrate) as a coating for orthopedic implants. It was found that brushite is transformed into a more stable calcium phosphate (hydroxyapatite), regardless of the aqueous transforming media utilized. The transformation was carried out at room temperature in deionized water, deionized water with added calcium ions, and modified Hank's type solution without calcium and magnesium ions, modified Hank's type solution with calcium and magnesium ions, and modified Hank's type solution with added calcium ions. In several of the transformation systems it was noted that brushite provided an increased amount of calcium ions to the transforming media through solubility. The process was monitored using X-ray diffraction, X-ray photoelectron spectroscopy, and dissolution studies. Scanning electron microscopy and energy dispersive spectroscopy were also utilized for characterization. The brushite coatings can be easily achieved electrolytically on conducting substrates. The process is non line of sight, simple, and inexpensive; and when using an electrolyte that can sustain currents of approximately 100 mA/cm2, the necessary coating can be completed in about 3 min.

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Section: Resultsmentioning

confidence: 98%

Electrodeposition of brushite coatings and their transformation to hydroxyapatite in aqueous solutions

Kumar¹,

Dasarathy²,

Riley³

1999

J. Biomed. Mater. Res.

140

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“…The growth morphology of CHPD crystals that appeared in the controlled system was found to be typical in form of thin platelets with prominent (010) and lateral (401) faces [11,12]. CHPD crystallizes in monoclinic system [12].…”

Section: = -Log 10 [-Log(1-α) / T 2 ] and Y = (1/t) X 10 -3mentioning

confidence: 98%

FTIR spectroscopic, thermal and growth morphological studies of calcium hydrogen phosphate dihydrate crystals

Joshi

Joshi²

2003

Cryst. Res. Technol.

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Calcium hydrogen phosphate dihydrate (CHPD or DCPD) is found quite frequently in urinary calculi (stones). The CHPD crystals were grown by the single diffusion gel growth technique in sodium metasilicate gel. The crystals were found to be having platelet and broad needle type morphologies. The crystals were analyzed by FTIR spectroscopy. The thermal properties were studied by employing the thermogravimetric analysis. Various kinetic and thermodynamic parameters for dehydration were estimated. The selected platelet was studied by SEM for the growth morphologies indicating that the crystals grew in the form of leaflets having prominent (010) faces. This was in agreement with earlier reported studies.Calcium stones are most commonly occurs form of nephrolithiasis, that is, kidney stones. Calcium oxalate stones are more common than calcium phosphate, but mixed calcium oxalate-phosphate is the most common variety. Struvite stones, usually seen in the setting of urinary tract infections, is the most common type of renal stone. Calcium phosphate is present in urinary calculi as either apatite [Ca 10 (PO 4 The aim is to study the growth morphology of selected crystal by SEM and also study the crystals by applying Fourier Transform Infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). Moreover, the kinetic and thermodynamic parameters are to be obtained for dehydration of crystals from the thermogram.In the present investigation, the CHPD or DCPD crystals have been grown by the single diffusion gel growth technique. Glass test tubes of 25mm diameter and 140 mm length were used as a crystallization apparatus. The AR grade chemicals were used to grow the crystals. One of the reactants, 2.5 M orthophosphoric acid solution was mixed with sodium metasilicate solution of 1.06 specific gravity, so that the pH of the mixture could be set to 6.0. The mixture was transferred into different test tubes. After setting gels, the supernatant solution of 1 M calcium chloride was poured without disturbing the set gels. The nucleation started immediately. The first Liesegang ring was observed within 12 minutes of pouring the supernatant solution. The number of Liesegang rings increased with time and total eighteen Liesegang rings were observed after five days. However, at the same time the first few Liesegang rings started diffusing. The distance between two consecutive Liesegang rings was found to be increasing towards bottom of test tubes. The elongated platelet shape crystals as well as broad needle type crystals were grown within the Liesegang rings. Also several platelets originating from a single point as in star or floral formations were also observed.

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“…It grows easily from solution in a platelike morphology. Although the growth and surface structure of brushite single crystals have been studied, 14,15 the interface atomic structure of the most prominent faces has not been determined. The property that makes this crystal particularly attractive for the investigation of solid-liquid interfaces is that brushite has water ("ice") incorporated in the crystal structure.…”

mentioning

confidence: 99%

Liquid ordering at the Brushite-{010}–water interface

et al. 2004

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Using surface x-ray diffraction, we have determined the atomic structure of the ͕010͖ interface of brushite, CaHPO 4 ·2͑H 2 O͒, with water. Since this biomineral contains water layers as part of its crystal structure, special ordering properties at the interface are expected. We found that this interface consists of two water bilayers with different ordering properties. The first water bilayer is highly ordered and can be considered as part of the brushite crystal structure. Surprisingly, the second water bilayer exhibits no in-plane order, but shows only layering in the perpendicular direction. We propose that the low level of water ordering at the interface is correlated with the low solubility of brushite in water.

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Crystal habit and growth conditions of brushite, CaHPO4 ⋅ 2H2O

Cited by 71 publications

References 20 publications

Electrodeposition of brushite coatings and their transformation to hydroxyapatite in aqueous solutions

Electrodeposition of brushite coatings and their transformation to hydroxyapatite in aqueous solutions

FTIR spectroscopic, thermal and growth morphological studies of calcium hydrogen phosphate dihydrate crystals

Liquid ordering at the Brushite-{010}–water interface

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