کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1478779 991235 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Punctual investigation of surface sites of HA and magnesium-HA
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Punctual investigation of surface sites of HA and magnesium-HA
چکیده انگلیسی

IR spectroscopy of adsorbed CO is used for the first time to characterize surface cationic centres of pure and magnesium doped hydroxyapatite (HA and MHA, respectively). In air, water molecules saturate the coordination sphere of exposed surface cations by a strong coordinative interaction. At first, the materials were outgassed at 300 °C in order to remove water molecules adsorbed on the surface. Following this treatment, surface sites able to adsorb CO are produced. The vibrational frequency of adsorbed CO is sensitive to the features of the adsorbing sites. The IR spectra of CO adsorbed on HA revealed the presence of surface Ca2+ ions differing for the degree of coordinative unsaturation and of POH groups. On MHA, CO was able to monitor the presence of surface Mg2+ ions, the amount of which increased by aging the material in air.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 26, Issue 6, 2006, Pages 987–991
نویسندگان
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