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Titel: Progress Report on pH-Influenced Photocatalysis for Active Motion
VerfasserIn: Heckel, Sandra
Hübner, Julia
Leutzgen, Anne
Jung, Gregor
Simmchen, Juliane
Sprache: Englisch
Titel: Catalysts
Bandnummer: 11
Heft: 5
Verlag/Plattform: MDPI
Erscheinungsjahr: 2021
Freie Schlagwörter: microswimmer
smart
pH-sensitive
photoacid
DDC-Sachgruppe: 540 Chemie
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Living systems use catalysis to achieve chemical transformations to comply with their needs in terms of energy and building blocks. The pH is a powerful means to regulate such processes, which also influences synthetic systems. In fact, the pH sensitivity of artificial photocatalysts, such as bismuth vanadate, bears the strong potential of flexibly influencing both the motion pattern and the speed of catalytic microswimmers, but it has rarely been investigated to date. In this work, we first present a comprehensive view of the motion behavior of differently shaped bismuth vanadate microswimmers, discuss influences, such as shape, pH, and conductivity of the solutions, and find that the motion pattern of the swimmers switches between upright and horizontal at their point of zero charge. We then apply an immobilizable hydroxypyrene derivative to our substrates to locally influence the pH of the solution by excited-state proton transfer. We find that the motion pattern of our swimmers is strongly influenced by this functionalization and a third motion mode, called tumbling, is introduced. Taking other effects, such as an increased surface roughness of the modified substrates, into account, we critically discuss possible future developments.
DOI der Erstveröffentlichung: 10.3390/catal11050599
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-340986
hdl:20.500.11880/31355
http://dx.doi.org/10.22028/D291-34098
ISSN: 2073-4344
Datum des Eintrags: 25-Mai-2021
Bezeichnung des in Beziehung stehenden Objekts: Supplementary Materials
In Beziehung stehendes Objekt: https://www.mdpi.com/article/10.3390/catal11050599/s1
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Gregor Jung
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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