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Small-Molecule Stabilization of ITO Nanoparticles

For many applications, nanoparticles need to be provided as dispersions. Hence, their stabilization against agglomeration is of utmost importance. Whilst the classical colloidal methods involve either charge stabilization or the adsorption of polymers to the particle surface, nanoparticles can often also be stabilized by the adsorption of small organic molecules. This “small-molecule stabilization” is commonly employed in nanomaterials synthesis and processing, but yet there is a lack of fundamental understanding of the underlying fundamentals and mechanisms for particles below 100 nm in size.

This research project aims at an elucidation of small-molecule stabilization especially of small nanoparticles < 10 nm in size. Using model systems with monodisperse nanoparticles, the interrelation between the adsorption of the stabilizer and the deagglomeration of the nanoparticles is explored. A special focus of the project is the influence of solvent compatibility of the stabilizer on the stabilization in diverse media, as well as investigations on the long-term stability. The experimental results are complemented by theoretical calculations of the interaction energies between the particles based on DLVO, XDLVO and steric interaction theories. The project is funded by Deutsche Forschungsgemeinschaft within the framework of SPP 1273 “Colloids processing”.

ITO nanoparticles in chloroform left – stabilized, right – unstabilized

[1]  G. Garnweitner, Small molecule stabilization: A novel concept for the stabilization of small inorganic nanoparticles, in: L. Segewicz and M. Petrowsky (Eds.), Polymer Aging, Stabilizers and Amphiphilic Block Copolymers, Nova Science Publishers, 2010.
[2]  G. Garnweitner, H. O. Ghareeb, C. Grote, “Small-molecule in situ stabilization of TiO2 nanoparticles for the facile preparation of stable colloidal dispersions”, Colloids and Surfaces Part A: Physicochemical and Engineering Aspects 2010, 372, 41-47.

Team Members

Current Projects
Synthesis, self-assembly and printing of hard-magnetic nanoparticles more

Quanomet, Junior Research Group “Nanofluidics & Particle Manipulation” more

Processing of conjugated nanoparticle hybrid systems for use in biomedical diagnostics more

Fractionation of Nanoparticles by Preparative Gel Electrophoresis subproject of the SPP 2045 more

Advanced lithium-sulfur battery concepts for aviation (aero-LiS-SE) more

Principles of nanoscale matrix additives for fibre composite more

Nanoscale drug carrier systems as therapeutics for targeted tumor therapy more

Small Angle X-ray Scattering as Metrological Instrument – A Correlation Study on the Optical Properties of Semiconductor Nanoparticles as ubiquitous Measure of Particle Size more

Fractionation of Nanoparticles by Preparative Gel Electrophoresis more

Thin nanoparticle films for cathode composites in all solid state batteries more

ElektroBak – Innovative Materials and Concepts for Microbial Electrochemical Systems more

Characteristics of a nanoparticulate coating based on the process chain more

Finished Projects
Synthesis and processing of tailored AZO nanocrystals more

Preparation of multifunctional nanocomposite thin films made of nanosized building blocks more

Process technology of the synthesis of metal oxide nanoparticles by nonaqueous sol gel methods more

Biocompatible iron-oxide nanoparticles for the in-situ magnetic separation of bioproducts more

Small-Molecule Stabilization of ITO Nanoparticles more

AiF – CleanCoat: Development of transparent, photocatalytically active coatings on polymer substrates with long-term stability more

Protein purification with functionalized magnetic nanoparticles more