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Preparation of transparent BaSO 4 nanodispersions by high-gravity reactive precipitation combined with surface modification for transparent X-ray shielding nanocomposite films
Frontiers of Chemical Science and Engineering ( IF 4.5 ) Pub Date : 2020-12-23 , DOI: 10.1007/s11705-020-1985-y
Le Fang , Qian Sun , Yong-Hong Duan , Jing Zhai , Dan Wang , Jie-Xin Wang

BaSO4 nanoparticles as important functional materials have attracted considerable research interests, due to their X-rays barrier and absorption properties. However, most of BaSO4 nanoparticles prepared by traditional technology are nanopowders with broad size distribution and poor dispersibility, which may greatly limit their applications. To the best of our knowledge, the synthesis of transparent BaSO4 nanodispersions was rarely reported. Here, we firstly present a novel and efficient method to prepare transparent and stable BaSO4 nanodispersions with a relatively small particle size around 10 to 17 nm using a precipitation method in a rotating packed bed (RPB), followed by a modification treatment using stearic acid. Compared with the BaSO4 prepared in a traditional stirred tank, the product prepared using an RPB has much smaller particle size and narrower size distribution. More importantly, by using RPB, the reaction time can be significantly decreased from 20 min to 18 s. Furthermore, the transparent BaSO4-polyvinyl butyral nanocomposite films with good X-ray shielding performance can be easily fabricated. We believe that the stable BaSO4 nanodispersions may have a wide range of applications for transparent composite materials and coatings with X-ray shielding performance for future research.



中文翻译:

高重力反应沉淀结合表面改性制备透明BaSO 4纳米分散体,用于X射线屏蔽纳米复合薄膜

作为重要的功能材料的BaSO 4纳米颗粒由于其X射线阻挡层和吸收特性而吸引了相当多的研究兴趣。然而,通过传统技术制备的大多数BaSO 4纳米颗粒是纳米粉末,其粒度分布宽且分散性差,这可能极大地限制了它们的应用。据我们所知,很少报道透明BaSO 4纳米分散体的合成。在这里,我们首先提出一种新颖有效的方法来制备透明稳定的BaSO 4在旋转填充床(RPB)中使用沉淀法在约10至17 nm的范围内使用相对较小的纳米分散体,然后使用硬脂酸进行改性处理。与在传统搅拌釜中制备的BaSO 4相比,使用RPB制备的产品具有更小的粒径和更窄的粒径分布。更重要的是,通过使用RPB,反应时间可以从20分钟显着减少到18 s。此外,可以容易地制造具有良好的X射线屏蔽性能的透明BaSO 4-聚乙烯醇缩丁醛纳米复合膜。我们相信稳定的BaSO 4 纳米分散体对于具有X射线屏蔽性能的透明复合材料和涂料可能具有广泛的应用,以供将来研究。

更新日期:2020-12-23
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