Abstract
Using Zeta potential, adsorption capacity, contact angle, molecular dynamics simulation of the adsorption of sodium carbonate on the surface of calcium carbonate (CaCO3), we outline the mechanism of the in situ surface activation of CaCO3 nanoparticles via interaction with sodium stearate and a double phase inversion of emulsions. The CaCO3 nanoparticles can be activated in situ surface activation by adsorbing sodium stearate to become an effective emulsifier. After adding different initial concentrations of sodium stearate to CaCO3 nanoparticles dispersion, a monolayer or bilayer of sodium stearate will form at the surface of CaCO3 nanoparticles. There exists an inversion of CaCO3 nanoparticles from hydrophilicity to hydrophobicity and subsequently back to hydrophilicity. A double phase inversion, O/W (1)→W/O→O/W (2), is thus achieved by the synergistic effect of CaCO3 nanoparticles and different initial concentrations of sodium stearate.
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