Investigation of experimental parameters in the manufacture of nano sized BaSO4 crystals

Today, the production of small particles in research and development fields has become an important subject. These nano-particles have wide application potential in many areas such as heterogeneous catalysis, semiconductors, microelectronics, data storage, pharmaceutical, paint and ceramic industrial applications. When the crystals are reduced to very small dimensions, a large increase in surface area occurs and this can earn them many new different features. With the increase of surface area of the barium sulfat synthesized in a nanometer range, improved benefits are provided to the properties of a material such as thermal stability of the materials, the crystallization rate, resistance activity and thermoluminescence properties. The resulting surface activity of these nano particles is quite high due to the high surface area to volume ratio of the particles and as a result they tend to agglomerate which decreases their applicability. In order to obtain the barium sulfate particles with the appropriate properties for the material that it is used, avoiding the agglomeration and having a controlled size and morphology during the production is of critical importance. In this study the effects of ethylenediamine tetraacetic acid, polyacrylic acid and polyvinyl sulfonic acid on barium sulfate crystallization which has a great importance for industries such as pharmaceuticals, paint, plastic and especially the oil industry were investigated. The barium sulfate crystals synthesized with the additives used in different concentrations and the effects of these additives on the properties of the crystals such as particle size, morphology and tendency to agglomerate were investigated. In order to examine the effect of various experimental conditions on crystallization process, productions were also carried out in different pH, temperature and addition. Concidering the results of the experimental studies, it is observed that the concentration of the used additives and the pH of the barium sulfate crystallization has significant effects on the average size, morphology and agglomeration tendency of the formed crystals.