Dynamics of an ellipsoid at a fluid interface

Abstract : Dynamics of anisotropic particles at a fluid interface governs trapping and particles subsequent assembly. Measuring and controlling this viscous dynamics open the way to new materials [1], and applications [2]. Despite these domains of applications, measurements of the viscous coefficient of anisotropic particles were mainly restricted to the bulk [3-4] or in quasi-2D confinement between two glass plates [5]. Here we measure the complete set of viscous coefficients of single micrometric prolate ellipsoids near and trapped at an air-water interface. These coefficients are obtained from the Brownian motion of the particle coupling interferometry and particle tracking. For particles trapped at the interface we measured anomalously large drags even larger than in the bulk water (ratio of surface/ bulk rotational drags rR > 1 in Figure) [6]. Such an intriguing behaviour is discussed in terms of additional random forces due to thermally activated fluctuations of the interface and their coupling to the particle drag through the fluctuation–dissipation theorem. Figure: Rotational viscous-drag ratio rR (surface/bulk) of polystyrene ellipsoidal particles at an air/water interface versus particle’s aspect ratio φ. Inset: mean square angular displacements (MSADs) versus the time lag τ. [1] M. Cavallaro, L. Botto, E. Lewandowski, M. Wang, and K. Stebe, PNAS 108, 20923 (2011). [2] Z. Huang, D. Legendre, and P. Guiraud, Chem. Eng. Sci. 66, 982 (2011). [3] D. Mukhija and M. Solomon, J. Colloid Interface Sci. 314, 98 (2007). [4] T. H. Besseling, M. Hermes, A. Kuijk et al., Journal of Physics: Condensed Matter 27, 194109 (2015). [5] Y. Han, A. Alsayed, M. Nobili, J. Zhang, T. Lubensky, and A. Yodh, Science 314, 626 (2006). [6] G. Boniello, C. Blanc, D. Fedorenko, M. Medfai, N. Ben Mbarek, M. In, M. Gross, A. Stocco, M. Nobili, Nature Materials 14, 908 (2015).
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Poster communications
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Submitted on : Monday, September 26, 2016 - 10:33:58 AM
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Giuseppe Boniello, Stefano Villa, Antonio Stocco, In Martin, Michel Gross, et al.. Dynamics of an ellipsoid at a fluid interface. 4th International Soft Matter Conference, Sep 2016, Grenoble, France. ⟨hal-01371516⟩

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