Magnesium hydroxide nanoparticles synthesized in water-in-oil microemulsions

Well-dispersed magnesium hydroxide nanoplatelets were synthesized by a simple water-in-oil (w/o) microemulsion process, blowing gaseous ammonia (NH3) into microemulsion zones solubilized by magnesium chloride solution (MgCl2). Typical quaternary microemulsions of Triton X-100/cyclohexane/n  -hexanol/water were used as space-confining microreactors for the nucleation, growth, and crystallization of magnesium hydroxide nanoparticles. The obtained magnesium hydroxide was characterized by field-emission scanning electron microscopy (FESEM), high-resolution transmission election microscopy (HRTEM), X-ray powder diffraction (XRD), laser light scattering, Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis–differential scanning calorimetry (TGA–DSC). The mole ratio of water to surfactant (ω0)(ω0) played an important role in the sizes of micelles and nanoparticles, increasing with the increase of ω0ω0. The compatibility and dispersibility of nanoparticles obtained from reverse micelles were improved in the organic phase.

Graphical abstractThis paper focuses on the synthesis of well-dispersed and size-controllable magnesium hydroxide nanoparticles with uniform shape and even size in a quaternary microemulsion of Triton X-100/cyclohexane/n-hexanol/water.Figure optionsDownload full-size imageDownload as PowerPoint slide