Journal Article

FZJ-2020-04287

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Capillary interactions between soft capsules protruding through thin fluid films

Wouters, M. ; Aouane, O.FZJ* ; Sega, M.FZJ* ; Harting, J. (Corresponding author)FZJ*

2020
Royal Soc. of Chemistry London

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Please use a persistent id in citations: http://hdl.handle.net/2128/26631  doi:10.1039/D0SM01385D

Abstract: When a suspension dries, the suspending fluid evaporates, leaving behind a dry film composedof the suspended particles. During the final stages of drying, the height of the fluid film on thesubstrate drops below the particle size, inducing local interface deformations that lead to strongcapillary interactions among the particles. Although capillary interactions between rigid particles arewell studied, much is still to be understood about the behaviour of soft particles and the role oftheir softness during the final stages of film drying. Here, we use our recently-introduced numericalmethod that couples a fluid described using the lattice Boltzmann approach to a finite elementdescription of deformable objects to investigate the drying process of a film with suspended softparticles. Our measured menisci deformations and lateral capillary forces, which agree well withprevious theoretical and experimental works in case of rigid particles, show that the deformationsbecome smaller with increasing particles softness, resulting in weaker lateral interaction forces. Atlarge interparticle distances, the force approaches that of rigid particles. Finally, we investigate thetime dependent formation of particle clusters at the late stages of the film drying.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)
2. JARA - HPC (JARA-HPC)

Research Program(s):

1. 121 - Solar cells of the next generation (POF3-121) (POF3-121)
2. Dynamics of complex fluids (jiek11_20191101) (jiek11_20191101)

Appears in the scientific report 2020

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Database coverage:
; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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