Self-assembly of jammed heterogeneous colloidal shells by combining electrohydrodynamics and dielectrophoresis

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• Prof. Jon Otto Fossum, Department of Physics, Norwegian University of Science and Technology (NTNU)
• Thursday 10 November 2016, 14:00-15:00
• Wolfson Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Sharon Connor.

Adsorption and assembly of colloidal particles at the surface of liquid droplets are at the base of particle-stabilized emulsions and templating. It has been demonstrated that electrohydrodynamic and dielectrophoretic effects in leaky-dielectric liquid drops can be used to structure and dynamically control colloidal particle assemblies at drop surfaces [1], suggesting new routes for Janus or patchy colloidosome assembly, including jammed colloidal shells(Pickering drops) with designed heterogeneous surfaces that combine the functionalities offered by Janus or patchy particles, and those given by permeable shells such as colloidosomes [2]. It has also been demonstrated that the stress induced by uniform electric-fields incolloidal jammed Pickering drops, is absorbed by plastic deformation or surface crumpling, at electric fields above a yield stress. At stronger electric fields, simultaneous deformation and spontaneous electrohydrodynamic rotation of Pickering drops has been observed, followed by a transition from a solid to a liquid state and tank-treading dynamics of the Pickering particle layer [3], as well as emergence of paired colloidosome swimmers [4].

1. Dommersnes P., Rozynek Z., Mikkelsen M., Castberg R. , Kjerstad, K., Hersvik K., Fossum J.O. (2013) Active structuring of colloidal armour on liquid drops, Nature Communications 4:2066 2. Rozynek Z., Mikkelsen A., Dommersnes P., Fossum J.O. (2016), Electroformation of Janus and patchy capsules, Nature Communications, 5:3945 3. A. Mikkelsen, P. Dommersnes, Z. Rozynek, A. Gholamipour-Shirazi, M. S. Carvalho and J.O. Fossum (2016) Mechanics and rheology of Pickering drops probed by electric field induced stress, In preparation for submission 4. P. Dommersnes, A. Mikkelsen & J. O. Fossum (2016) Electro-hydrodynamic propulsion of counter-rotating Pickering drops, European Physical Journal Special Topics 225, 699–705

This talk is part of the Materials Chemistry Research Interest Group series.

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