Reaction of calcium hydrogenphosphate dihydrate (DCPD) with a solution containing a small amount of fluoride
Reaction of calcium hydrogenphosphate dihydrate (DCPD) with a solution containing a small amount of fluoride
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DOI：
10.2109/jcersj.113.363
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发表时间：
2005-05-01
影响因子：
1.1
通讯作者：
Chohji, T
中科院分区：
文献类型：
--
作者：
Tafu, M;Chohji, T
二水磷酸氢钙 (DCPD) 与溶液中的氟离子有效反应，形成氟磷灰石 (FAp)。本文研究了 DCPD 与含有少量氟化物的溶液的反应。将2.0g DCPD添加到2.0dm(3)含有20mg dm(-3)氟化物的溶液中，然后反应不同的时间。我们观察到溶液中氟离子浓度没有变化的“滞后时间”。经过这段滞后时间，溶液中的氟离子浓度迅速下降。从粉末X射线衍射、场发射扫描电子显微镜（FE-SEM）观察和固相化学分析结果来看，DCPD并没有直接与氟离子反应，而是在DCPD颗粒表面形成纳米级颗粒，然后与氟化物反应形成缺钙FAp。从这些结果来看，滞后时间可以被认为是在 DCPD 颗粒表面形成纳米级颗粒所需的时间。还发现在较低温度下可与DCPD反应的氟化物的量较大。
Calcium hydrogenphosphate dihydrate (DCPD) efficiently reacts with fluoride ion in a solution to form fluorapatite (FAp). In this paper, the reaction of DCPD with a solution containing a small amount of fluoride was investigated. 2.0 g of DCPD was added to 2.0 dm(3) of solution containing 20 mg dm(-3) of fluoride, and then reacted for various periods. We observed a "lag time" within which the concentration of fluoride ions in the solution did not change. After this lag time, the fluoride ion concentration in the solution quickly decreased. From the results of powder X-ray diffraction, fied emmision-scanning electron microscopy (FE-SEM) observation and chemical analysis of the solid phase, DCPD did not directly react with the fluoride ions, but formed a nanoscale particle on the surface of the DCPD particles, and then reacted with the fluoride to form calcium deficient FAp. From these results, the lag time could be considered to be the time needed to form nano-scale particles on the surface of the DCPD particles. It was also found that the amount of fluoride reactable with DCPD was larger at lower temperatures.