Preparation of transparent BaSO_(4) nanodispersions by high-gravity reactive precipitation combined with surface modification for transparent X-ray shielding nanocomposite films

摘要

BaS0_(4) nanoparticles as important functional materials have attracted considerable research interests,due to their X-rays barrier and absorption properties.However,most of BaS0_(4) 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 BaS0_(4) nanodispersions was rarely reported.Here,we firstly present a novel and efficient method to prepare transparent and stable BaS0_(4) 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 BaS0_(4) 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 BaS0_(4)-polyvinyl butyral nanocomposite films with good X-ray shielding performance can be easily fabricated.We believe that the stable BaS0_(4) nanodispersions may have a wide range of applications for transparent composite materials and coatings with X-ray shielding performance for future research.