title: Particulate Coacervation of Associative Polymer Brushes-Grafted Nanoparticles To Produce Structurally Stable Pickering Emulsions.
abstract: This study introduces a new type of associative nanoparticle (ANP) that provides controlled chain-to-chain attraction with an associative polymer rheology modifier (APRM) to produce highly stable Pickering emulsions. The ANPs were synthesized by grafting hydrophobically modified hygroscopic zwitterionic poly(2-methacryloyloxyethyl phosphorylcholine-co-stearyl methacrylate) brushes onto 20 nm sized silica NPs via surface-mediated living radical polymerization. The ANP-stabilized Pickering emulsions show significant viscosity enhancement in the presence of the APRM. This indicates that the ANPs act as particulate concentration agents at the interface owing to their hydrophobic association with the APRM in the aqueous phase, which leads to the generation of an ANP-mediated complex colloidal film. Consequently, the described ANP-reinforced Pickering emulsion system exhibits improved resistance to pH and salinity changes. This coacervation approach is advantageous because the complex colloidal layer at the interface provides the emulsion drops with a mechanically robust barrier, thus guaranteeing the improved Pickering emulsion stability against harsh environmental factors.
authors.forename: Taeseung
authors.initials: T
authors.lastname: Yang
authors.forename: Sang Koo
authors.initials: SK
authors.lastname: Choi
authors.forename: Daehwan
authors.initials: D
authors.lastname: Park
authors.forename: Yea Ram
authors.initials: YR
authors.lastname: Lee
authors.affiliation: SK Bioland Company Ltd. , Cheonan 31257, Republic of Korea.
authors.forename: Chan Bok
authors.initials: CB
authors.lastname: Chung
authors.forename: Jin Woong
authors.identifier: 0000-0002-2823-8825
authors.initials: JW
authors.lastname: Kim