Measuring contact angles of small spherical particles at planar fluid interfaces by Light Extinction

An experimental technique is introduced for measuring the contact angle of small colloidal particles at planar fluid interfaces. The presented light scattering-based method relies on performing two spectral transmittance measurements: one on a particle monolayer standing at the fluid interface and t...

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Bibliographic Details
Published in:Applied physics letters 2016-05, Vol.108 (20)
Main Authors: Horváth, Imre T., Colinet, Pierre, Vetrano, Maria Rosaria
Format: Article
Language:English
Subjects:
Applied physics
Contact angle
Light scattering
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Summary:An experimental technique is introduced for measuring the contact angle of small colloidal particles at planar fluid interfaces. The presented light scattering-based method relies on performing two spectral transmittance measurements: one on a particle monolayer standing at the fluid interface and the other on a dispersion of the same particles in a homogeneous medium. The observed shift between the two transmitted spectra is explained in terms of the phase shift parameter, which is then used to determine the particle position relative to the interface and hence the contact angle. The applicability of the technique is demonstrated through simulations and experiments.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4950960