Doubly pH-Responsive Pickering Emulsion
journal contributionposted on 02.12.2008 by Jian Li, Harald D. H. Stöver
Any type of content formally published in an academic journal, usually following a peer-review process.
A pH-responsive Pickering emulsion has been designed on the basis of commercially available alumina-coated silica nanoparticles (Ludox CL silica particles) and potassium hydrogen phthalate (KHP). KHP was found to bind to cationic particle surfaces at pH values between 3.5 and 5.5, enabling the resulting surface-active particles to stabilize emulsions of xylenes in water. Above and below this pH range, the system demulsifies, resulting in a reversible Pickering emulsifier having two pH-controlled, reversible transitions.