文献类型：期刊文献

英文题名：Formation and stabilization of Pickering emulsions using salt-sensitive core-shell cationic nanoparticles

作者：Fu, Enyu[1];Chen, Kaimin[1];Wang, Qiaoling[1];Zhang, Ying[2];Yan, Nana[1];Liu, Li[1]

机构：[1]Shanghai Univ Engn Sci, Coll Chem & Chem Engn, Shanghai 201620, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：56

期号：25

起止页码：14019

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20212310478500);WOS:【SCI-EXPANDED(收录号:WOS:000656785400003)】；

基金：This work was financially supported by the National Natural Science Foundation of China (21504052). We thank Scientific Compass (www.shiyanjia.com) for its scientific assistance in sample testing in this project.

语种：英文

外文关键词：High resolution transmission electron microscopy - Ions - Morphology - Emulsification - Nanoparticles - Stability - Targeted drug delivery - Controlled drug delivery - Demulsification - Dynamic light scattering - Shells (structures) - Dynamics - Ostwald ripening

摘要：Pickering emulsions known for their solid emulsifiers and brilliant stability characters have attracted many researchers' attention. The controlled stability and demulsification of emulsion are necessary in some cases such as crude oil extraction and drug release. Stimuli-responsive Pickering emulsion could provide suitable controllability and emerged in the last decade. Among various controllable factors, salt ion is known as a critical parameter, but it is rarely investigated. Here, core-shell cationic nanoparticles with a poly-(2-aminoethyl methacrylate hydrochloride) shell and a polystyrene core were used in the preparation of Pickering emulsion. The size and morphology of nanoparticles were monitored by transmission electron microscopy and dynamic light scattering. The microstructure and stability of the formed Pickering emulsion were studied via dynamic light scattering and a polarizing optical microscope under various salt ion types and concentrations. The effect of salt types (Cl-, ClO4-, and PO43-) and salt concentrations on the Pickering emulsion was investigated. Cl-, ClO4-, and PO43- are in situ generated from NaCl, NaClO4, and (NaPO3)(6), respectively. It showed that PO43- (100-1000 mM) was unable to form stable Pickering emulsion, while Cl- and ClO4- could induce stable Pickering emulsions under optimized conditions. Furthermore, after increasing the salt concentration over a critical salt concentration, the Pickering emulsion underwent rapid demulsification. This work revealed the effects of salt on size, conformation, charge, wettability, interaction, and adsorption state of nanoparticles and proposed the stability mechanisms of the Pickering emulsion. This opened up more potential applications in the field of controlled demulsification, petroleum recovery, catalyst recovery, and so on triggered by salt ions.