In situ formed Mg(OH)2 nanoparticles as pH-switchable stabilizers for emulsions

► In situ formed magnesium hydroxide nanoparticles (MHp) could served as a excellent emulsion stabilizer. ► Owing to strong pH dependence during precipitation of MHp, MHp shows excellent pH-dependent and reversibility, which make it with pH-switchability for emulsion stability. ► The key rule for such phenomenon is a pH reversibility between ionic form and particle form, which may be applied to other metal hydroxide nanoparticles.