Study of the formation process of manganese dioxide nanoparticles stabilized by alkyldimethylbenzylammonium chloride

Samples of nanosized manganese dioxide stabilized with alkyldimethylbenzylammonium chloride were obtained by chemical deposition. During optimization, it was revealed that for the synthesis of manganese dioxide nanoparticles with an average hydrodynamic radius of less than 1200 nm, the optimal synthesis parameters are: temperature from 20 to 35 °C, KMnO₄ mass from 4 to 5 g and stabilizer concentration from 4 to 5%. Study of the samples using scanning electron microscopy showed that a sample of nano-sized manganese dioxide stabilized with alkyldimethylbenzylammonium chloride is formed by irregularly shaped aggregates ranging in size from 1 to 75 μm, which consist of nanoparticles with a diameter from 50 to 250 nm. The structure was studied using X-ray diffractometry and it was found that the resulting sample has a tetragonal crystal lattice with space group I4/m; presence of this phase is indicated by presence of low-intensity broadened peaks. As a result of analyzing the data obtained by modeling the interaction of the alkyldimethylbenzylammonium chloride molecule and manganese oxide through the nitrogen, it was established that the presented compounds are energetically favorable (∆E = 1299.571 kcal/mol), and interaction occurs through nitrogen. This compound has a chemical hardness value η ≥ 0.030 eV, which indicates its stability. As a result of the analysis of the IR-spectra of alkyldimethylbenzylammonium chloride and nano-sized manganese dioxide stabilized by alkyldimethylbenzylammonium chloride, it can be concluded that interaction between alkyldimethylbenzylammonium chloride and manganese dioxide occurs through nitrogen.