Some important factors in the wet precipitation process of hydroxyapatite

Afshar, Abdollah; Ghorbani, Mohammad; Ehsani, N.; Saeri, M.R.; Sorrell, Charles C.

doi:10.1016/s0261-3069(03)00003-7

Cited by 200 publications

(132 citation statements)

References 8 publications

Supporting

Mentioning

112

Contrasting

Unclassified

Order By: Relevance

“…These are similar to the particle morphologies reported elsewhere [50][51][52][53][54][55]. Details of the observed average particle size from FESEM images are tabulated in Table 2.…”

Section: Of 17supporting

confidence: 85%

Synthesis and characterisation of nanohydroxyapatite using an ultrasound assisted method

Poinern

Brundavanam

Mondinos

et al. 2009

Ultrasonics Sonochemistry

155

View full text Add to dashboard Cite

Nanostructured hydroxyapatite (HAP) was prepared by a wet precipitation method using Ca(NO 3 ) and KH 2 PO 4 as the main material and NH 3 as the precipitator under ultrasonic irradiation. The Ca/P ratio was set at 1.67 and the pH maintained at a minimum of 9. The temperature conditions and ultrasound influences were investigated using X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Fourier Transform Infrared Spectroscopy (FT-IR). The results showed that Nano-HAP can be obtained by this method and the particles were achieved to around 30nm.

show abstract

“…These are similar to the particle morphologies reported elsewhere [50][51][52][53][54][55]. Details of the observed average particle size from FESEM images are tabulated in Table 2.…”

Section: Of 17supporting

confidence: 85%

Synthesis and characterisation of nanohydroxyapatite using an ultrasound assisted method

Poinern

Brundavanam

Mondinos

et al. 2009

Ultrasonics Sonochemistry

155

View full text Add to dashboard Cite

show abstract

“…However, these synthesised β-TCP powders were not stable in terms of its thermal properties whereby they were converted to α-TCP at temperatures above 1125 o C [5]. In terms of starting materials, the present research modified the study used by Cheang and Khor [10] and other researchers [11][12][13] to synthesise β-TCP. According to Afshar and his co-workers [11,12], HA can be synthesised using the system of Ca(OH)2 and H3PO4 with a Ca/P ratio of 1.67.…”

Section: Introductionmentioning

confidence: 95%

“…In terms of starting materials, the present research modified the study used by Cheang and Khor [10] and other researchers [11][12][13] to synthesise β-TCP. According to Afshar and his co-workers [11,12], HA can be synthesised using the system of Ca(OH)2 and H3PO4 with a Ca/P ratio of 1.67. This reaction was expected to be developed as an industrial-scale method to produce HA with the correct stoichiometric composition according to the Eq.…”

Section: Introductionmentioning

confidence: 99%

Parameters affecting the synthesis of -tricalcium phosphate powder using a wet precipitation method

Othman¹,

Mustafa²,

Kiên³

et al. 2017

J. MECH. ENG. SCI.

View full text Add to dashboard Cite

In this work, precursor materials that are normally used to directly synthesise hydroxyapatite (HA) were adopted to obtain tricalcium phosphate (TCP). Calcium hydroxide, (Ca(OH)2), and phosphoric acid, (H3PO4), with a Ca/P ratio of 1.5, were mixed as the precursor materials. The mixture was stirred at various stirring speeds ranging from 0 to 400 rpm, over a range of stirring durations of 1 to 4 hours. Upon completion of the reaction, the as-prepared powders were calcined at different temperatures ranging from 500 o C-1300 o C for a soaking duration that was varied between 1-4 hours. Differential scanning calorimetry (DSC) and thermogravimetry (TG) were used for thermal analyses to ascertain the calcination temperatures, whilst x-ray diffraction (XRD) was utilised to determine the phases formed before and after calcination. Field emission scanning electron microscopy (FESEM) was used to monitor the morphological changes at different calcination temperatures. Based on the XRD results, the phases formed were dependent on the processing parameters employed. This work has successfully ascertained that the most optimum parameters to synthesise singlephase β-TCP are a stirring speed of 200 rpm, a calcination temperature of 900 o C, a calcination soaking duration of 2 hours and a mixing duration of 1 hour. Microstructural observation conducted on the -TCP powders obtained at calcination temperatures of 900 o C to 1300 o C showed an aggregated structure of particles with massive grain growth as the temperature was raised up to 1300 o C.

show abstract

“…Hence, the development of an improved toughness HA material is required. As a result, various studies have been carried out to improve the mechanical properties of sintered HA 4 . The success of HA ceramic in biomedical application is largely dependent on the availability of a high quality, sintered HA that is characterized having refined microstructure and improved mechanical properties 4 .…”

Section: Introductionmentioning

confidence: 99%

“…As a result, various studies have been carried out to improve the mechanical properties of sintered HA 4 . The success of HA ceramic in biomedical application is largely dependent on the availability of a high quality, sintered HA that is characterized having refined microstructure and improved mechanical properties 4 . Intensive research in HA involving a wide range of powder processing techniques, composition and experimental conditions have been investigated with the aim of determining the most effective synthesis method and conditions to produce well-defined particle morphology [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Sintering Behavior of Hydroxyapatite Ceramics Prepared by Different Routes

Yong

Ramesh

Liang

et al. 2009

Advances in Bioceramics and Porous Ceramics II

View full text Add to dashboard Cite

The sintering behaviour of three different HA, i.e. a commercial HA(C) and synthesized HA by wet precipitation, HA(W) and mechanochemical method, HA(M) were investigated over the temperature range of 1000°C to 1350°C. In the present research, a wet chemical precipitation reaction was successfully employed to synthesize highly crystalline, high purity and single phase stoichiometric HA powder that is highly sinteractive particularly at low temperatures below 1100ºC. It has been revealed that the sinterability and mechanical properties of the synthesized HA by this method was significantly higher than that of the commercial material and HA which was synthesized by mechanochemical method. The optimum sintering temperature for the synthesized HA(W) was 1100°C with the following properties being recorded: 99.8% relative density, Vickers hardness of 7.04 GPa and fracture toughness of 1.22 MPam 1/2 . In contrast, the optimum sintering temperature for the commercial HA(C) and synthesized HA(M) was 1300°C with relative density of 98% and 95.5%, Vickers hardness of 5.47 GPa and 4.73 GPa, fracture toughness of 0.75 MPam 1/2 and 0.82 MPam

show abstract

Some important factors in the wet precipitation process of hydroxyapatite

Cited by 200 publications

References 8 publications

Synthesis and characterisation of nanohydroxyapatite using an ultrasound assisted method

Synthesis and characterisation of nanohydroxyapatite using an ultrasound assisted method

Parameters affecting the synthesis of -tricalcium phosphate powder using a wet precipitation method

Sintering Behavior of Hydroxyapatite Ceramics Prepared by Different Routes

Contact Info

Product

Resources

About