Phosphate Minerals edited by J. O. Nriagu and P. B. Moore. Springer‐Verlag, Berlin 1984. No. of pages: 442. Price: D. M. 148; US $58.10 (approx.)

Manning, David

doi:10.1002/gj.3350200213

Cited by 1 publication

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“…39 Then, the stoichiometric HA, which has a ratio of Ca/P = 1.67, differs from CA in its stoichiometry, however carbonate substitutions frequently alter HA structure and its properties, when such substitution takes place, HA is commonly referred to as ‘carbonate hydroxyapatite’ (CHA) with Ca/P ratio of 1.50. 40 The chemical composition of the HA sample exhibited in Figure 1 was also examined by EDXS founding an average Ca/P ratio of 1.52. Thus, this indicates that the HA prepared in this work is a carbonate HA.…”

Section: Resultsmentioning

confidence: 99%

Preparation and tribological properties of chitosan/hydroxyapatite composite coatings applied on ultra high molecular weight polyethylene substrate

Navarro

Moreno

Morquecho³

et al. 2012

Journal of Plastic Film & Sheeting

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We prepared a chitosan/hydroxyapatite composite as coating on ultra-highmolecular-weight polyethylene substrates. The hydroxyapatite was prepared by a precipitation method obtaining particles with nanometer sizes with needle and spherical morphologies. The coating was prepared by a mixture of hydroxyapatite and lower molecular weight chitosan. Fourier transformed infrared spectroscopy technique was used to study the hydroxyapatite synthesis and composite coating. The chitosan/hydroxyapatite coating has been compared with a pure chitosan coating on ultra-high-molecular-weight polyethylene substrate in order to study the influence of hydroxyapatite incorporation. The characterization of coating thickness was performed by light microscopy, whereas the surface morphology was characterized by scanning electron microscopy. A ball-on-disc tribometer, employing a 6-mm diameter tungsten carbide ball, was run as a test method to investigate tribological behaviors of the chitosan/hydroxyapatite and chitosan coatings in dry conditions. It was found that the friction coefficients of the chitosan/hydroxyapatite coating have lower values than chitosan coating. The chitosan/hydroxyapatite coating exhibited lower wear rate values than the chitosan coating. The incorporation of hydroxyapatite nanoparticles into chitosan increased the coating thickness from 20 mm to 37 mm. We have found a composite hardness of 9.1 HV and 6.4 HV for the chitosan and chitosan/hydroxyapatite coating, respectively.

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Section: Resultsmentioning

confidence: 99%