As part of my bachelor thesis, I investigated the influence of the coating of magnetic nanoparticles on the zeta potential. The particles were synthesized from two salt solutions and then coated with citric acid or cetyltrimethylammonium bromide. Our research was focused on the functionalization and characterization of coated magnetic particles for polyphenolic extraction from wood biomass. The nanoparticles had to have a specific concentration and express superparamagnetic properties for their further use. In this way, polyphenols could be extracted from wood biomass in an environmentally friendly way, thus improving the use of wood waste. We found that all nanoparticles exhibit superparamagnetic properties, and citric acid proved to be a more suitable surfactant, as the measured zeta potential values were higher than in the sample coated with CTAB. The citric acid coating also lowered the isoelectric point, making the suspension more stable at the desired conditions.
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