From gel-like Pickering emulsions to highly ordered superparamagnetic magnetite aggregates with embedded gold nanoparticles
- Pickering emulsions with two types of nanoparticles, i.e., superparamagnetic magnetite nanoparticles dispersed in n-hexane and gold nanoparticles dispersed in water, were formed by rigorous mixing in presence of surface active polymeric surfactants. Monodisperse magnetite nanoparticles with a mean particle size of 4 nm were obtained by a microwave-assisted synthesis in n-hexane in presence of oleic acid, and gold nanoparticles were produced in aqueous solution in presence of the hyperbranched poly(ethyleneimine) (PEI) or sodium citrate as reducing and stabilizing agent. After mixing the prepared nanoparticle dispersions in presence of the Pluronics an intermediate gel-like phase is formed. The Pickering emulsion droplets in the intermediate phase are stabilized by both types of nanoparticles, as to be seen by cryo-SEM micrographs. After separating, solvent evaporation and redispersion in water highly ordered Pluronic-stabilized superparamagnetic magnetite nanoparticle aggregates with embedded gold nanoparticles can be obtained.
Author details: | Sabine KosmellaGND, Bastian KlemkeORCiD, Ines HäuslerGND, Joachim KoetzORCiDGND |
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DOI: | https://doi.org/10.1016/j.colsurfa.2019.03.017 |
ISSN: | 0927-7757 |
ISSN: | 1873-4359 |
Title of parent work (English): | Colloids and surfaces : an international journal devoted to the principles and applications of colloid and interface science ; A, Physicochemical and engineering aspects |
Publisher: | Elsevier Science |
Place of publishing: | Amsterdam |
Publication type: | Article |
Language: | English |
Date of first publication: | 2019/06/05 |
Publication year: | 2019 |
Release date: | 2021/01/25 |
Tag: | Cryo-SEM; HRTEM; Magnetite and gold nanoparticles; Magnetization measurements; Pickering emulsions; Pluronics; Ring tensiometry |
Volume: | 570 |
Number of pages: | 8 |
First page: | 331 |
Last Page: | 338 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer review: | Referiert |