Preparation of superparamagnetic γ-Fe2O3@LS@PS composite latex particles through pickering miniemulsion polymerization

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 585; p. 124040
• Main Authors: Zhou, M.J., Zhou, S.Z., Pang, X.C., Li, K.R., Qiao, X.G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.01.2020
• Subjects: Lignosulfonate; Pickering miniemulsion polymerization; Strawberry-like; Superparamagnetic; γ-Fe2O3; Superparamagnetic; Pickering miniemulsion polymerization; γ-Fe2O3; Lignosulfonate; Strawberry-like
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2019.124040

Superparamagnetic composite latex particles with strawberry-like morphologies were prepared with lignosulfonate (LS) modified γ-Fe2O3 through Pickering miniemulsion polymerization. [Display omitted] Based on the electrostatic interaction, prepared γ-Fe2O3 nanoparticles with high positive charges (+ 45 mv) were modified by negative charged ligninsulfonate (LS, - 34 mv) to synthensize LS/γ-Fe2O3 composite. LS is low-price, environmentally friendly and renewable biomacromolecule. The LS/γ-Fe2O3 composite were applied in a Pickering miniemulsion polymerization as the only stabilizer, without any auxiliary comonomers and surfactants. The surface anchored γ-Fe2O3 induced the formation of strawberry-like hybrid latex particles who were endowed with superparamagnetic functional properties. Furthermore, the effect of the ratios of LS to γ-Fe2O3 on the stability of the LS/γ-Fe2O3 composites was investigated. The content of γ-Fe2O3 in the LS/γ-Fe2O3 composites should be lower than 66.7 wt%, or the stability of the Pickering miniemulsion polymerization would be destroyed, owing to the charge neutralization behavior of the LS and γ-Fe2O3. Within this range, the latex particle size increased with the increasing of γ-Fe2O3 content.