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首页> 外文期刊>Materials Chemistry and Physics >Conversion of nacre powders to apatite in phosphate buffer solutions at low temperatures
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Conversion of nacre powders to apatite in phosphate buffer solutions at low temperatures

机译：在低温下在磷酸盐缓冲液中将珍珠母粉转化为磷灰石

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Apatite (HAP) powders with poor crystallinity were obtained from nacre powders by treatment with phosphate buffer solutions of pH's 6.0-8.0, kept at 37 ℃ for 1-12 days. The effects of pH values, particle size, and reaction time on the conversion of nacre powders were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). Nacre powders are converted to HAP both by treatment with the basic or neutral phosphate solutions, and by treatment with the acidic phosphate solutions without regulating pH values during the reaction using dicalcium phosphate dehydrate (DCPD) or octacalcium phosphate (OCP) as active intermediate phases. Decreasing particle size and prolonging reaction time can improve the conversion percentages of nacre powders to HAP. In addition, the dissolution-recrystallisation mechanism of HAP formation was discussed further in the present work.
机译：通过在pH值为6.0-8.0的磷酸盐缓冲溶液中于37℃下保温1-12天，从珍珠母粉中获得结晶度较差的磷灰石（HAP）粉末。通过X射线粉末衍射（XRD），扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）研究了pH值，粒径和反应时间对珍珠母粉转化的影响。通过使用碱性磷酸钙或中性磷酸盐溶液处理，以及通过使用磷酸氢钙二水合物（DCPD）或磷酸八钙（OCP）作为活性中间相，在反应过程中通过调节pH值而不用酸性磷酸盐溶液处理，将珍珠母粉转化为HAP。减小粒径和延长反应时间可以提高珍珠母粉向HAP的转化率。另外，在本工作中还进一步讨论了HAP形成的溶解-再结晶机理。

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