Hybrid Magnetic Particles Based on Laponite RD®: Structure, Stability, and Electrosurface Properties

Hybrid magnetic particles based on Laponite (R) (Lap) (Rockwood Additives Ltd., UK) and nanomagnetic (NM) particles have been synthesized. The NM was synthesized using the Elmore method. For preparation of LapM hybrids, the Lap and NM were mixed in aqueous suspensions at pH 7.3 and T = 298 K. The concentration of NM particles at suspensions was fixed at 0.75 wt%, and concentration of Lap was varied in the range of 0.0375-1.5 wt% (the mass ratio Xm = mNM/mLap was varied within the range 20.0-0.5). The Lap, LapM, andNMparticles were characterized using FTIR-spectroscopy, X-ray diffraction, magnetic susceptometry, transmission electron microscopy, measurements of particle size distribution function, and electrophoretic mobility. The observed variations in magnetic susceptibility.,.potential and overcharging were explained by the deep integration between Lap and NM particles, and interplaying between hydrophobic and electrostatic interactions in LapM hybrids.