title: Stabilization of Pickering emulsions by generating complex colloidal layers at liquid-liquid interfaces.
abstract: Typical Pickering emulsions accumulate particles to form a robust colloidal layer at an immiscible liquid-liquid interface. However, if the particles are smaller than tens of nanometers, they have a tendency toward coming off from the interface, thereby destabilizing emulsion drops. To solve this problem, a technique that can make the adsorbed nanoparticles stay at the interface should be developed. This study introduces a practical method that allows us to obtain a mechanically stable Pickering emulsions; n-decane was emulsified to form an oil-in-water emulsion of which interface was stabilized with a complex colloidal layer consisting of 12 nm-sized silica nanoparticles, a poly(vinyl alcohol) binder, and an alkyl-chained silane coupling agent. We have found that in the conditions of high salinity, the emulsion drops attract each other and form an emulsion gel phase. However, even in such harsh conditions, the complex silica layer maintains its original structure at the interface, thus stabilizing the emulsion drop against coalescence.
authors.affiliation: Department of Applied Chemistry, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea.
authors.forename: Geun Ju
authors.initials: GJ
authors.lastname: Lee
authors.forename: Han Am
authors.initials: HA
authors.lastname: Son
authors.forename: Jang Woo
authors.initials: JW
authors.lastname: Cho
authors.forename: Sang Koo
authors.initials: SK
authors.lastname: Choi
authors.forename: Hyun Tae
authors.initials: HT
authors.lastname: Kim
authors.forename: Jin Woong
authors.initials: JW
authors.lastname: Kim
keywords: Complex colloidal layer; Emulsion gel phase; Nanoparticles; Pickering emulsion