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Influence of patch size and chemistry on the catalytic activity of patchy hybrid nonwovens

Title data

Hils, Christian ; Dulle, Martin ; Sitaru, Gabriel ; Gekle, Stephan ; Schöbel, Judith ; Frank, Andreas ; Drechsler, Markus ; Greiner, Andreas ; Schmalz, Holger:
Influence of patch size and chemistry on the catalytic activity of patchy hybrid nonwovens.
In: Nanoscale Advances. Vol. 2 (2019) Issue 1 . - pp. 438-452.
ISSN 2516-0230
DOI: https://doi.org/10.1039/C9NA00607A

Project information

Project financing: Deutsche Forschungsgemeinschaft
VolkswagenStiftung
Bayerisches Staatsministerium für Umwelt und Verbraucherschutz

Abstract in another language

In this work, we provide a detailed study on the influence of patch size and chemistry on the catalytic activity of patchy hybrid nonwovens in the gold nanoparticle (Au NP) catalysed alcoholysis of dimethylphenylsilane in n-butanol. The nonwovens were produced by coaxial electrospinning, employing a polystyrene solution as core and a dispersion of spherical or worm-like patchy micelles with functional, amino group-bearing patches (dimethyl and diisopropyl amino groups, anchor groups for Au NP) as shell. Subsequent loading by dipping into a dispersion of preformed Au NPs yields the patchy hybrid nonwovens. In terms of NP stabilization, i.e., preventing agglomeration, worm-like micelles with poly(N,N-dimethylaminoethyl methacryl-amide) (PDMA) patches are most efficient. Kinetic studies employing an extended 1st order kinetics model, which includes the observed induction periods, revealed a strong dependence on the accessibility of the Au NPs´ surface to the reactants. The accessibility is controlled by the swellability of the functional patches in n-butanol, which depends on both patch chemistry and size. As a result, significantly longer induction (tind) and reaction (tR) times were observed for the 1st catalysis cycles in comparison to the 10th cycles and nonwovens with more polar PDMA patches show a significantly lower tR in the 1st catalysis cycle. Thus, the unique patchy surface structure allows to tailor the properties of this “tea-bag”-like catalyst system in terms of NP stabilization and catalytic performance, which resulted in a significant reduction of tR to about 4 h for an optimized system.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Theoretical Physics VI - Simulation and Modelling of Biofluids > Professor Theoretical Physics VI - Simulation and Modelling of Biofluids - Univ.-Prof. Dr. Stephan Gekle
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Theoretical Physics VI - Simulation and Modelling of Biofluids
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Research Institutions
Research Institutions > Affiliated Institutes
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 500 Natural sciences
Date Deposited: 12 Dec 2019 08:09
Last Modified: 22 Jan 2020 11:00
URI: https://eref.uni-bayreuth.de/id/eprint/53555