Complete Exchange of the Hydrophobic Dispersant Shell on Monodisperse Superparamagnetic Iron Oxide Nanoparticles
| Autor: | Erik Reimhult, Oliver Bixner, Andrea Lassenberger, Dieter Baurecht |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Thermogravimetric analysis
Materials science Dispersity Infrared spectroscopy Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry Ferric Compounds 01 natural sciences Dispersant Article Differential scanning calorimetry Spectroscopy Fourier Transform Infrared Electrochemistry General Materials Science Magnetite Nanoparticles Spectroscopy Ligand Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Membrane Chemical engineering 0210 nano-technology Hydrophobic and Hydrophilic Interactions Oleic Acid |
| Zdroj: | Langmuir |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.5b01833 |
| Popis: | High-temperature synthesized monodisperse superparamagnetic iron oxide nanoparticles are obtained with a strongly bound ligand shell of oleic acid and its decomposition products. Most applications require a stable presentation of a defined surface chemistry; therefore, the native shell has to be completely exchanged for dispersants with irreversible affinity to the nanoparticle surface. We evaluate by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) the limitations of commonly used approaches. A mechanism and multiple exchange scheme that attains the goal of complete and irreversible ligand replacement on monodisperse nanoparticles of various sizes is presented. The obtained hydrophobic nanoparticles are ideally suited for magnetically controlled drug delivery and membrane applications and for the investigation of fundamental interfacial properties of ultrasmall core-shell architectures. |
| Databáze: | OpenAIRE |
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