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首页> 外文期刊>International journal of biomedical nanoscience and nanotechnology >Synthesis and characterisation of nanocrystalline hydroxyapatite from sea shells
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Synthesis and characterisation of nanocrystalline hydroxyapatite from sea shells

机译：贝壳类纳米晶羟基磷灰石的合成与表征

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摘要

Nanocrystalline hydroxyapatite was synthesised by wet chemical reaction between sea shells (CaCO_3) which were thermally converted to amorphous calcium oxide (CaO) and then to calcium hydroxide (Ca(OH)_2) and reacted with phosphoric acid (H_3PO_4). Two experiments were conducted using wet chemical synthesis method. Hydroxyapatite (HA) was synthesised by slow addition of phosphoric acid in to calcium hydroxide (Ca(OH)_2) without microwave irradiation and in another method; microwave irradiation was carried out after the reactants were combined in a similar manner. In both the experiments, the Ca:P ratio of 1.67 was maintained. pH of the solution was maintained at 9 to avoid the formation of calcium deficient apatites. The synthesised samples show XRD patterns corresponding to hydroxyapatite. The wet chemical process without microwave irradiation resulted in rod shaped HA particles of size 101 run, whereas microwave irradiation of the solution after reaction also resulted in rod shaped HA but the particle size was only 68 nm as evidenced from XRD analyses. The TEM analyses reveal average aspect ratios of 3.37 +- 1.28 and 5.98 +- 2.28 for methods without and with microwave irradiation respectively.
机译：通过将贝壳（CaCO_3）之间进行湿化学反应合成了纳米晶羟基磷灰石，这些贝壳被热转化为无定形氧化钙（CaO），然后热转化为氢氧化钙（Ca（OH）_2），并与磷酸（H_3PO_4）反应。使用湿化学合成方法进行了两个实验。在不进行微波辐射的情况下，通过另一种方法将磷酸缓慢添加到氢氧化钙（Ca（OH）_2）中来合成羟基磷灰石（HA）。以类似方式合并反应物后，进行微波辐射。在两个实验中，Ca：P比率均保持在1.67。溶液的pH值保持在9以避免钙缺乏的磷灰石的形成。合成的样品显示出对应于羟基磷灰石的XRD图谱。在没有微波辐射的情况下的湿化学过程导致运行了大小为101的棒状HA颗粒，而反应后溶液的微波辐射也导致了棒状的HA，但从XRD分析可以看出，颗粒大小仅为68 nm。 TEM分析显示，分别采用无微波和有微波辐射的方法的平均纵横比分别为3.37±1.28和5.98±2.28。

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