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Dr. Miha Ravnik: Complex nematic fluids: colloids, activity, and micro-flow

Date: 12. 4. 2012
Source: Monday physics colloquium
Ponedeljek, 16. aprila 2012, ob 16:15 v predavalnici F1, FMF UL, Jadranska 19, Ljubljana

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Povzetek:

    Complex nematic fluids: colloids, activity, and micro-flow

    Dr. Miha Ravnik, Fakulteta za matematiko in fiziko, Univerza v Ljubljani

Complex fluids with internal structure are materials of interesting, generally strongly anisotropic, physical phenomena.  Active complex fluids, like swimmers, show collective rheology with internal order, liquid crystalline fluids give rise to complex optic and photonic properties, and colloids can self-assemble into micro and nanostructures with tuneable material characteristics. Here, I will present our recent contributions in complex nematic fluids, focusing on (i) the assembly of three-dimensional colloidal crystals in (passive) nematic liquid crystals, and (ii) on the active flow of a bio-complex fluid -the active nematic - in confinement. I will present relaxation method and the hybrid Lattice Boltzmann methods, as the two main tools that we employ for modelling of complex fluids.  Specifically, the analogy between the dynamics of active nematic fluids and (passive) nematic liquid crystals will be highlighted.