Recent Advances in the Preparation of Barium Sulfate Nanoparticles: A Mini-Review

Abstract

The potential for barium sulphate nanoparticles to be used in a variety of important fields has sparked a lot of attention. Methods for obtaining this material by milling (top-down approach) are not very popular due to the difficulty of controlling the size and shape of particles, as well as changes in their physicochemical properties during milling. More promising is the bottom-up approach, which is the interaction of Ba2+ and SO42− ions in a liquid environment. Direct precipitation is the simplest method; however, it does not allow control of the particle size. Microemulsions, microreactors membrane dispersion, as well as spinning disc reactors are used to overcome drawbacks of direct precipitation and allow control of particle size and shape. This is ensured mainly by intensive controlled micromixing of the precursors with concentrations close to saturated ones. The present review focuses on recent advances in the production of barium sulfate nanoparticles using various approaches, as well as their advantages and limitations. The issues of scaling up the techniques are also considered, and promising methods for obtaining BaSO4 nanoparticles are also discussed.

BaSO4-Epoxy Resin Composite Film for Efficient Daytime Radiative Cooling

“…Nanodispersions are nanoparticles that can be uniformly dispersed in liquid media and remain stable over time. It is characterized by high dispersibility, small particle size, and narrow particle size distribution. − Compared with conventional nanopowders, nanoparticles existing in the dispersions are much easier to be dispersed in composites and show better nanoeffects and other application performance. − In order to obtain superior application properties, the use of highly dispersed nanoparticles to build a secondary structure should be considered. Nanoclusters are described as micrometer-sized aggregates of nanoparticles, which have the advantages of both microparticles and nanoparticles, showing the characteristics of high dispersibility and outstanding mechanical properties.…”