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Journal of Nanoparticle Research

Erschienen in:

01.08.2014 | Research Paper

Surface functionalization of microwave plasma-synthesized silica nanoparticles for enhancing the stability of dispersions

verfasst von: Yee Hwa Sehlleier, Ali Abdali, Sophie Marie Schnurre, Hartmut Wiggers, Christof Schulz

Erschienen in: Journal of Nanoparticle Research | Ausgabe 8/2014

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Abstract

Gas phase-synthesized silica nanoparticles were functionalized with three different silane coupling agents (SCAs) including amine, amine/phosphonate and octyltriethoxy functional groups and the stability of dispersions in polar and non-polar dispersing media such as water, ethanol, methanol, chloroform, benzene, and toluene was studied. Fourier transform infrared spectroscopy showed that all three SCAs are chemically attached to the surface of silica nanoparticles. Amine-functionalized particles using steric dispersion stabilization alone showed limited stability. Thus, an additional SCA with sufficiently long hydrocarbon chains and strong positively charged phosphonate groups was introduced in order to achieve electrosteric stabilization. Steric stabilization was successful with hydrophobic octyltriethoxy-functionalized silica nanoparticles in non-polar solvents. The results from dynamic light scattering measurements showed that in dispersions of amine/phosphonate- and octyltriethoxy-functionalized silica particles are dispersed on a primary particle level. Stable dispersions were successfully prepared from initially agglomerated nanoparticles synthesized in a microwave plasma reactor by designing the surface functionalization.

Vorheriger Artikel A polymer encapsulation approach to prepare zwitterion-like, biocompatible quantum dots with wide pH and ionic stability

Nächster Artikel Rheology of powders and nanopowders through the use of a Couette four-bladed vane rheometer: flowability, cohesion energy, agglomerates and dustiness

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Titel: Surface functionalization of microwave plasma-synthesized silica nanoparticles for enhancing the stability of dispersions
verfasst von: Yee Hwa Sehlleier
Ali Abdali
Sophie Marie Schnurre
Hartmut Wiggers
Christof Schulz
Publikationsdatum: 01.08.2014
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 8/2014
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-014-2557-1

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