Mesoporous halloysite/magnetite composite: Synthesis, characterization and in vitro evaluation of the effect on the bacteria viability. (August 2022) - Alekseeva, Olga V.
Abstract: Halloysite/magnetite composite material was synthesized by the chemical coprecipitation of iron salts in halloysite pores. Halloysite, magnetite and halloysite/magnetite samples were characterized by a number of physicochemical methods. According to X-ray diffraction analysis, data of SEM and TEM, magnetic nanoparticles were embedded in the clay mineral matrix. Using the nitrogen adsorption-desorption technique it was found that powders under study can be attributed to mesoporous bodies with a small fraction of macropores. For the first time, fractal models were used to describe the porosity of the studied materials. The values of the fractal dimension (as a quantitative characteristic of inhomogeneity) were found in the range of 2.5–3. Infrared spectrometry indicated a formation of the hydrogen bonds between the oxygen-containing groups of magnetite and halloysite. The biological activity of halloysite and the halloysite/magnetite composite was investigated and it was found that in the presence of these powders, the viability of E. coli M-17 bacteria increased 2–3 times in comparison with the control sample. Graphical Abstract: ga1