Magnetic Fields Enhanced the Performance of Tubular Dichalcogenide Micromotors at Low Hydrogen Peroxide Levels.
magnetic
micromotors
propulsion
simulation
tungsten disulfide
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
11 Oct 2019
11 Oct 2019
Historique:
received:
23
05
2019
revised:
22
07
2019
pubmed:
8
8
2019
medline:
8
8
2019
entrez:
8
8
2019
Statut:
ppublish
Résumé
Propulsion at the microscale has attracted significant research interest. In this work, a numerical simulation to explain the speed boost of up to 34 % experienced by transition metal dichalcogenides (TMD) based micromotors under the effect of applied magnetic fields is described. The simulations show that, when an external magnetic field is applied, the flow regime changes from turbulent to laminar. This causes an increase in the residence time of the fuel over the catalyst surface, which enhances the oxygen production. The more efficient generation and growth of the bubbles lead to an increase of the capillary force exerted by them. Interestingly, the effect is more pronounced as the level of fuel decrease. The validity of the model is also proven by comparing both theoretical and experimental results. Interestingly, the speed enhancement in magnetic mode depends on geometrical factors only, as a similar phenomenon was observed in a variety of microjets with a variable surface roughness. The understanding of such phenomena will open new avenues for understanding and controlling the motion behavior of high-towing-force catalytic micromotors.
Identifiants
pubmed: 31390485
doi: 10.1002/chem.201902368
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
13157-13163Subventions
Organisme : Ministry of Science, Innovation and Universities
ID : RYC-2015-17558, co-financed by EU
Organisme : Ministry of Science, Innovation and Universities
ID : CTQ2017-86441-C2-1-R
Organisme : Ministry of Science, Innovation and Universities
ID : MAT2017-85089-C2-1-R
Organisme : Universidad de Alcalá
ID : FPI UAH
Organisme : Universidad de Alcala
ID : CCG2018/EXP-018
Organisme : Comunidad de Madrid
ID : TRANSNANOAVANSENS program (S2018/NMT-4349)
Informations de copyright
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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