Active structuring of colloidal armour on liquid drops
Fossum, Jon Otto
- Publisher: Nature Publishing Group
(issn: 2041-1723, eissn: 2041-1723)
mesheuropmc: endocrine system | complex mixtures | body regions | digestive, oral, and skin physiology
Adsorption and assembly of colloidal particles at the surface of liquid droplets are at the base
of particle-stabilized emulsions and templating. Here we report that electrohydrodynamic and
electro-rheological effects in leaky-dielectric liquid drops can be used to structure and
dynamically control colloidal particle assemblies at drop surfaces, including electric-fieldassisted
convective assembly of jammed colloidal ‘ribbons’, electro-rheological colloidal
chains confined to a two-dimensional surface and spinning colloidal domains on that surface.
In addition, we demonstrate the size control of ‘pupil’-like openings in colloidal shells. We
anticipate that electric field manipulation of colloids in leaky dielectrics can lead to new routes
of colloidosome assembly and design for ‘smart armoured’ droplets.
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