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Effect of bio-calcium oxide on the morphology of hydroxyapatite

机译：生物钙对羟基磷灰石形态的影响

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摘要

A study of the Hydroxyapatite (HAp) synthesis through a hydrothermal process was carried out. Bio-Calcium oxide (CaO) obtained by heat treatment of sand dollar was used in the synthesis at different proportions to react with monetite (CaHPO 3 ). Structural and chemical characterization of the samples was carried out using scanning electron microscopy (SEM), X-ray diffraction; Infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). In each sample were observed different morphologies such as agglomerates, hexagonal particles, epitaxial growth, and fibers. O, Ca, P, C and small amounts of Mg and Si were the main chemical components of the sharp morphologies. The hydroxyapatite, whitocklite, portlandite and calcite were the crystalline phases found in each of the samples analyzed. Two different growth shapes of HAp single crystals were found using transmission electron microscopy. The HAp single crystal with six well-defined prismatic faces was reveled to grow along side the crystallographic direction. The HAp single crystal with fiber morphology grew alongside c-axis. However, both morphologies of HAp single crystals present a ratio Ca/P less compared with the stoichiometric ratio (Ca/P=1.67).
机译：对通过水热法合成羟基磷灰石（HAp）的研究。通过对沙钱进行热处理而获得的生物氧化钙（CaO）以不同的比例用于合成反应，以与绿橄榄石（CaHPO 3）反应。样品的结构和化学表征使用扫描电子显微镜（SEM），X射线衍射进行;红外光谱（FTIR）和透射电子显微镜（TEM）。在每个样品中观察到不同的形态，例如附聚物，六角形颗粒，外延生长和纤维。 O，Ca，P，C和少量Mg和Si是尖锐形貌的主要化学成分。在每个分析的样品中发现了羟基磷灰石，白云母，硅酸盐和方解石为结晶相。使用透射电子显微镜发现了HAp单晶的两种不同的生长形状。将具有六个明确定义的棱晶面的HAp单晶倾斜，使其沿着晶体学方向生长。具有纤维形态的HAp单晶沿c轴生长。但是，与化学计量比（Ca / P = 1.67）相比，HAp单晶的两种形态都具有Ca / P比。

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