Effect of processing conditions on the formation of hydroxyapatite nanoparticles

Salimi, M. N.; Bridson, Rachel H.; Grover, Liam M.; Leeke, Gary A.

doi:10.1016/j.powtec.2011.11.049

Cited by 77 publications

(42 citation statements)

References 33 publications

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“…Results and discussion X-ray diffraction patterns of all HA samples treated at different temperature are shown in Figure 1and The presence of CaO after heat treatment is in agreement with the results reported by Kutty [15], Skinner [16] and A. Costescu [17]. With the increase of the calcination temperature HA would have started losing hydroxyl groups forming various phosphates.…”

Section: IIIsupporting

confidence: 88%

“…XRD patterns were collected over the 2θ range of 10-60° at a step size of 0.02° and counting time of 0.5°/mn. Crystalline phases detected in the patterns were identified by comparison to standard patterns from the ICDD-PDF [14,15]. Rietveld analysis was performed on the XRD of HA900 powder by using a Fullprof suite-2010 software program.…”

Section: Characterizationmentioning

confidence: 99%

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A novel method to synthesize nanocrystalline hydroxyapatite: Characterization with x-ray diffraction and infrared spectroscopy

Idrissi¹,

Yamni²,

Yacoubi³

et al. 2014

IOSRJAC

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Section: IIIsupporting

confidence: 88%

Section: Characterizationmentioning

confidence: 99%

A novel method to synthesize nanocrystalline hydroxyapatite: Characterization with x-ray diffraction and infrared spectroscopy

Idrissi¹,

Yamni²,

Yacoubi³

et al. 2014

IOSRJAC

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“…All of these methods can be undertaken in almost ambient conditions. Although a number of workers have investigated the influence of processing on the crystallinity and purity of calcium phosphate salts [17,18,19], to date there has been relatively little work on the effect that these factors could have on cell attachment to the coating surface.…”

Section: Discussionmentioning

confidence: 99%

Nanoscale crystallinity modulates cell proliferation on plasma sprayed surfaces

Smith

Paxton

Hung

et al. 2015

Materials Science and Engineering: C

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Calcium phosphate coatings have been applied to the surface of metallic prostheses to mediate hard and soft tissue attachment for more than 40 years. Most coatings are formed of high purity hydroxyapatite, and coating methods are often designed to produce highly crystalline surfaces. It is likely however, that coatings of lower crystallinity can facilitate more rapid tissue attachment since the surface will exhibit a higher specific surface area and will be considerably more reactive than a comparable highly crystalline surface. Here we test this hypothesis by growing a population of MC3T3 osteoblast-like cells on the surface of two types of hip prosthesis with similar composition, but with differing crystallinity. The surfaces with lower crystallinity facilitated more rapid cell attachment and increased proliferation rate, despite having a less heterogeneous surface topography. This work highlights that the influence of the crystallinity of HA at the nano-scale is dominant over macro-scale topography for cell adhesion and growth.Furthermore, crystallinity could be easily adjusted by without compromising coating purity.These findings could facilitate designing novel coated calcium phosphate surfaces that more rapidly bond tissue following implantation.

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“…Formation of a small amount of NiMoO 4 (the strongest peak being at 2θ ≈ 29 • ) is not excluded [11,12]. [13].…”

Section: Powder X-ray Diffractionmentioning

confidence: 98%

Preparation, characterization of Mo catalysts supported on Ni- containing calcium deficient hydroxyapatite and reactivity for the thiophene HDS reaction

Cherif

Hadhoudi

Ezzamouri

et al. 2013

MATEC Web of Conferences

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Abstract. Ni-containing Calcium Hydroxyapatite (NiCaHAp; 3.31 wt.% Ni) was synthesized by coprecipitation and used as catalyst support. Molybdenum was supported on NiCaHAp by impregnation using ammonium heptamolybdate. The prepared catalysts Mo(x)/NiCaHAp (x: 2 to 8 wt % in Mo) were characterized by elemental analysis, XRD, FT-IR, N 2 adsorptiondesorption and TEM-EDX. The catalysts were sulfided in-situ at 673 K under flowing H 2 S/H 2 (15 Vol.% H 2 S) and tested in hydrodesulfurization (HDS) of thiophene at 673 K. The main XRD peaks of hydroxyapatite CaHAp phase were observed in all samples and a peak due probably to crystalline MoO 3 phase was also identified from the results. However, no crystalline phase of NiO was found for the catalysts, which showed its Ni species were highly dispersed. The sulfided catalysts Mo(x)/NiCaHAp presented are active in HDS of thiophene, despite the presence of some large MoO 3 crystallites and incomplete sulfidation. This activity may be due to interaction of NiO and MoO 3 on CaHAp resulting in the formation of Ni-Mo-S phase under flowing H 2 S/H 2 . When the molybdenum content increased the HDS activity increasead slightly, which was caused by the agglomeration of MoO 3 . The Mo(8)/NiCaHAp catalyst is about two times less active for thiophene HDS than the commercial NiMoP/Al 2 O 3 .

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Effect of processing conditions on the formation of hydroxyapatite nanoparticles

Cited by 77 publications

References 33 publications

A novel method to synthesize nanocrystalline hydroxyapatite: Characterization with x-ray diffraction and infrared spectroscopy

A novel method to synthesize nanocrystalline hydroxyapatite: Characterization with x-ray diffraction and infrared spectroscopy

Nanoscale crystallinity modulates cell proliferation on plasma sprayed surfaces

Preparation, characterization of Mo catalysts supported on Ni- containing calcium deficient hydroxyapatite and reactivity for the thiophene HDS reaction

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