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- W4366752368 abstract "The paper proposes a new method for the synthesis of ultradispersed amorphous SiO2 powders in the reverse emulsions stabilized by sodium bis-(2-ethylhexyl) sulfosuccinate (AOT). Colloidal dispersions of the powders were obtained by ultrasonication in water and chloroform. The number average effective hydrodynamic diameter of particles in the sols was 90 and 200 nm, and ζ-potential was − 68 ± 3 and 52 ± 7 mV for water and chloroform, respectively. Accountable for charge formation and transformation are the AOT molecules that were adsorbed on the SiO2 surface during the synthesis in АОТ emulsions. In water, АОТ– ions serve as the potential-determining ones, while Na+ ions act as the counterions that form the diffusion part of the electrical double layer. With a decrease in the solvent polarity, Na+ ions become the potential-determining ones, and АОТ– ions – the counterions. Thus, the АОТ molecules embedded into the hybrid SiO2 @ АОТ particle during the synthesis are a certain switch key of the particle surface potential. The transformation of the surface charge in dependence on polarity of the organic solvent makes it possible to apply the synthesized powders both as the cation- and anion-exchange sorbents for the recovery of dyes from aqueous and non-aqueous media. In terms of fundamental advances, the novelty of our work consists in extending the ion-exchange sorption mechanism of ionic dyes to the media with a low dielectric constant." @default.
- W4366752368 created "2023-04-24" @default.
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- W4366752368 date "2023-07-01" @default.
- W4366752368 modified "2023-09-27" @default.
- W4366752368 title "Charged colloidal SiO2 dispersions in water and chloroform: Synthesis, properties and perspectives in dyes adsorption" @default.
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- W4366752368 doi "https://doi.org/10.1016/j.colsurfa.2023.131505" @default.
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