A simple route to renewable high internal phase emulsions (HIPEs) strengthened by successive cross-linking and electrostatics of polysaccharides.

We demonstrate a simple synthesis of renewable high internal phase emulsions (HIPEs) featuring great stability and processability, by centrifuging ultrasonication-produced oil-filled polysaccharide microspheres without the aid of any surfactant or synthetic particles. The properties of HIPEs and corresponding porous structure (closed-/open-cell) are controllable by simply adjusting the ultrasonic intensity and ionization of polysaccharides.