Determination of the swimming mechanism of Au@TiO2 active matter and implications on active–passive interactions
Wang, Linlin and Simmchen, Juliane (2023) Determination of the swimming mechanism of Au@TiO2 active matter and implications on active–passive interactions. Soft Matter, 19 (3). pp. 540-549. ISSN 1744-6848 (https://doi.org/10.1039/d2sm01097f)
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Abstract
Non-equilibrium dynamic assembly attracts considerable attention due to the possibility of forming diverse structures that can potentially lead to functional materials. Despite significant progress in understanding and modelling, the complexity of the system implies that different phases of the assembly formation are governed by different interactions. It is clear that both, hydrodynamic and chemical interactions stem from the activity of the particle, but correlation to specific chemical species remains not yet understood. Here, we investigate the origin of the main driving forces for light-driven Au@TiO2 micromotors and look at the implication this causes for the interactions between active and passive particles. We develop precision experimental measurements of the photochemical reaction rate, which are correlated with the observed speed of Au@TiO2 micromotors. The comparison with two distinct models allows the conclusion that the dominant propulsion mechanism of the active particles is self-electrophoresis based on the self-generated H+ gradient. We verify this assumption by adding salt and confirm the dependence of the expected swimming behaviour on salt concentration and investigate the consequences for raft formation in COMSOL simulations.
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Item type: Article ID code: 83914 Dates: DateEvent21 January 2023Published15 December 2022Published Online15 December 2022Accepted13 August 2022SubmittedSubjects: Science > Chemistry > Physical and theoretical chemistry
Science > PhysicsDepartment: Faculty of Science > Pure and Applied Chemistry Depositing user: Pure Administrator Date deposited: 30 Jan 2023 09:40 Last modified: 28 Sep 2024 14:12 URI: https://strathprints.strath.ac.uk/id/eprint/83914