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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >A new approach to prepare well-dispersed CaF_2 nanoparticles by spray drying technique
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A new approach to prepare well-dispersed CaF_2 nanoparticles by spray drying technique

机译：喷雾干燥技术制备分散良好的CaF_2纳米粒子的新方法

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摘要

Previously, nano-sized calcium fluoride (CaF_2) particles were prepared using a spray drying method by simultaneously feeding Ca(OH)_2 and NH_4F solutions to a two-liquid nozzle. The aim of the present study was to prepare better-dispersed nano-CaF_2 particles by co-forming a soluble salt, sodium chloride (NaCI). NaCI of various concentrations were added to the NH_4F solution, leading to formation of (CaF_2+NaCI) composites with CaF_2/NaCI molar ratios of 4/1, 4/4, and 4/16. Pure nano-CaF_2 was also prepared as the control. Powder X-ray diffraction analysis showed that the products contained crystalline CaF_2 and NaCI. Scanning electron microscopy examinations showed that both the CaF_2/NaCI composite and pure CaF_2 particles were about (50-800) nm in size and consisted of primary CaF_2 particles of < 50 nm in size. BET surface area measurements showed similar primary particle sizes for all samples. Dynamic light scattering measurements showed that the washed (CaF_2+NaCI) particles were much smaller than the pure CaF_2 as the dissolution of NaCI "freed" most of the primary CaF_2 particles, leading to a greater degree of particle dispersion. The well-dispersed nano-CaF_2 may be expected to be a more effective anticaries agent than NaF by providing longer lasting elevations of fluoride concentrations in oral fluids.
机译：以前，通过将Ca（OH）_2和NH_4F溶液同时供入二液喷嘴，使用喷雾干燥法制备了纳米级氟化钙（CaF_2）颗粒。本研究的目的是通过共形成可溶性盐氯化钠（NaCl）来制备分散性更好的纳米CaF_2颗粒。将各种浓度的NaCl添加到NH_4F溶液中，导致形成CaF_2 / NaCl摩尔比为4 / 1、4 / 4和4/16的（CaF_2 + NaCl）复合材料。还制备了纯纳米CaF_2作为对照。粉末X射线衍射分析表明产物含有结晶CaF_2和NaCl。扫描电子显微镜检查显示，CaF_2 / NaCl复合材料和纯CaF_2颗粒的尺寸均为（50-800）nm，并且由尺寸小于50 nm的主要CaF_2颗粒组成。 BET表面积测量显示所有样品的初级颗粒大小相似。动态光散射测量表明，洗涤后的（CaF_2 + NaCl）颗粒比纯CaF_2小得多，因为NaCl的溶解会“释放”大部分主要CaF_2颗粒，从而导致更大程度的颗粒分散。通过提供更长的持久的口腔液中氟化物浓度的持续升高，可以期望分散良好的纳米CaF_2是比NaF更有效的防龋剂。

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