Measurement of the capillary interaction force between Janus colloidal particles trapped at a flat air/water interface.
Soft Matter
; 16(25): 5910-5914, 2020 Jul 07.
Article
em En
| MEDLINE
| ID: mdl-32567631
ABSTRACT
The capillary interaction force between spherical Janus particles trapped at the air-water interface is measured using a time-sharing optical tweezer (bond number ⪠1). One face of the particles is hydrophilic, and the other one, hydrophobic. Measured force goes from almost pure quadrupolar to almost pure hexapolar interaction due to the three-phase contact line corrugation. Measured force curves are modeled as a sum of power laws, Ar-α + Br-ß + Cr-γ, obtained from an expansion in capillary multipoles. The mean values for the exponents of particle pairs of 3 µm are ãαã = 5.05 ± 0.12, ãßã = 7.02 ± 0.03, and ãγã = 5.96 ± 0.03. For particles pairs of 5 µm, we find ãαã = 5.02 ± 0.04, ãßã = 6.94 ± 0.06, and ãγã = 5.80 ± 0.05. In both cases, A < 0, B < 0, and C > 0.
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MEDLINE
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En
Ano de publicação:
2020
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Article