| Abstract [eng] |
Doctoral thesis „Investigation of Phase Transformations in the Synthesis of Magnesium Whitlockite Powders and Granules by the Dissolution-Precipitation Method“ describes large-scale dissolution-precipitation synthesis of Mg-WH powders and granules from gypsum, as well as Mg-WH granules from three different precursor materials (diammonium hydrogen phosphate, magnesium hydrogen phosphate, and calcium sulfate). The aim of the research is to investigate the phase transformations that govern the synthesis of Mg-WH powders and granules via a dissolution-precipitation method, and to optimize scalable synthesis conditions capable of yielding high-purity Mg-WH powders and granules in substantial quantities. An innovative Mg-WH dissolution-precipitation method was applied, surpassing traditional synthesis routes that require costly equipment and continuous monitoring of critical parameters (pH and temperature). For the first time, gypsum - an abundant and environmentally friendly material - was used as a precursor for the synthesis of Mg-WH granules. The experimental methodology section is divided into three subsections. The first subsection lists the chemical reagents used for synthesis and characterization, including their purities and manufacturers. The second subsection describes various forms of Mg-WH synthesis approaches: large-scale synthesis of Mg-WH powders from gypsum with different reaction durations; large-scale synthesis of Mg-WH granules with an assessment of the influence of reaction pH on phase composition; and synthesis of Mg-WH granules with different morphologies using single and mixed precursor granules. The final subsection presents the characterization methods of the synthesized samples, the specific experimental conditions, and the instruments used. All results are discussed in a separate part of the dissertation, and conclusions are drawn. |
