Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Influence of magnesium substitution on the basic properties of hydroxyapatites
AU - Diallo-Garcia, Sarah
AU - Laurencin, Danielle
AU - Krafft, Jean-Marc
AU - Casale, Sandra
AU - Smith, Mark E.
AU - Lauron-Pernot, Hélène
AU - Costentin, Guylène
PY - 2011
Y1 - 2011
N2 - Magnesium-substituted hydroxyapatites (HAP) have been prepared to evaluate the influence of cationic substitution on the surface basic properties of HAP. Despite successful introduction of some of the magnesium cations into the HAP structure (as evidenced by XRD, infrared, and Raman), no influence of low magnesium content in Mg(x)-HAP samples (x <= 1) on the basic conversion of 2-methylbut-3-yn-1-ol was found, which can be explained by the surface content of magnesium being low, as evidenced by CO adsorption. At higher magnesium content, a higher amount of magnesium could be detected on the surface, but this resulted in a structural disorder leading to either nonstoichiometry or eventually the formation of the phase whitlockite. In this case, the associated relative decrease of the amount of basic sites, as well as the possible influence of the enhanced surface concentration of acidic POH groups, are responsible for the lower intrinsic basicity of the related samples. In contrast, preliminary results indicate that an enhancement of the basic reactivity is observed on substituting calcium for strontium.
AB - Magnesium-substituted hydroxyapatites (HAP) have been prepared to evaluate the influence of cationic substitution on the surface basic properties of HAP. Despite successful introduction of some of the magnesium cations into the HAP structure (as evidenced by XRD, infrared, and Raman), no influence of low magnesium content in Mg(x)-HAP samples (x <= 1) on the basic conversion of 2-methylbut-3-yn-1-ol was found, which can be explained by the surface content of magnesium being low, as evidenced by CO adsorption. At higher magnesium content, a higher amount of magnesium could be detected on the surface, but this resulted in a structural disorder leading to either nonstoichiometry or eventually the formation of the phase whitlockite. In this case, the associated relative decrease of the amount of basic sites, as well as the possible influence of the enhanced surface concentration of acidic POH groups, are responsible for the lower intrinsic basicity of the related samples. In contrast, preliminary results indicate that an enhancement of the basic reactivity is observed on substituting calcium for strontium.
U2 - 10.1021/jp209316k
DO - 10.1021/jp209316k
M3 - Journal article
VL - 115
SP - 24317
EP - 24327
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
SN - 1932-7455
IS - 49
ER -