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Long‐Term Colloidally Stable Aqueous Dispersions of ≤5 nm Spinel Ferrite Nanoparticles

Title data

Eckardt, Mirco ; Thomä, Sabrina L. J. ; Dulle, Martin ; Hörner, Gerald ; Weber, Birgit ; Förster, Stefan ; Zobel, Mirijam:
Long‐Term Colloidally Stable Aqueous Dispersions of ≤5 nm Spinel Ferrite Nanoparticles.
In: ChemistryOpen. Vol. 9 (2020) Issue 11 . - pp. 1214-1220.
ISSN 2191-1363
DOI: https://doi.org/10.1002/open.202000313

Project information

Project title:
Project's official titleProject's id
SFB 840 - Von partikulären Nanosystemen zur MesotechnologieNo information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Applications in biomedicine and ferrofluids, for instance, require long-term colloidally stable, concentrated aqueous dispersions of magnetic, biocompatible nanoparticles. Iron oxide and related spinel ferrite nanoparticles stabilized with organic molecules allow fine-tuning of magnetic properties via cation substitution and water-dispersibility. Here, we synthesize <5 nm iron oxide and spinel ferrite nanoparticles, capped with citrate, betaine and phosphocholine, in a one-pot strategy. We present a robust approach combining elemental (CHN) and thermal gravimetric analysis (TGA) to quantify the ratio of residual solvent molecules and organic stabilizers on the particle surface, being of particular accuracy for ligands with heteroatoms compared to the solvent. SAXS experiments demonstrate the long-term colloidal stability of our aqueous iron oxide and spinel ferrite nanoparticle dispersions for at least 3 months. By the use of SAXS we approved directly the colloidal stability of the nanoparticle dispersions for high concentrations up to 100 gL^1.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: colloidal stability; nanoparticles; spinel phase; SAXS; ferrites
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry IV > Chair Inorganic Chemistry IV - Univ.-Prof. Dr. Birgit Weber
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professor Solid State Chemistry - Mesostructured Materials
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professor Solid State Chemistry - Mesostructured Materials > Junior Professor Solid State Chemistry - Mesostructured Materials - Juniorprof. Dr. Mirijam Zobel
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry IV
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 07 Dec 2020 10:30
Last Modified: 13 Jan 2021 11:25
URI: https://eref.uni-bayreuth.de/id/eprint/60767