Jorge Viñals

Jorge Viñals
Director of Graduate Studies; Professor, School of Physics and AstronomyContact
John T. Tate Hall Room 130-17 116 Church Street SeMinneapolis, MN 55455
Affiliations
Education
Ph.D., University of Barcelona, Spain
Our research is of theoretical and computational nature, and focuses on mesoscale theories of nonequilibrium phenomena in extended systems, with applications to Statistical Mechanics, Soft Matter Physics, and Materials Science. Generically, systems outside of thermodynamic equilibrium involve unstable interfaces and moving topological defects. We develop theories at the mesoscale of the relevant phases, analyze their macroscopic scale asymptotics, and obtain their non equilibrium properties through large scale computation. Our research is currently motivated by topologically driven flows in liquid crystals, unstable interfaces in complex fluids, and a mesoscale description of plasticity in defected materials.
Selected Publications
Preprints:
Topological defects, surfaces, and instabilities in liquid crystals
- The role of Gaussian curvature on local equilibrium and dynamics of smectic-isotropic interfaces.
- Computational molecular field theory for nematic liquid crystals.
- A model of the dynamics of an interface between a smectic phase and an isotropic phase of different density.
- Spiral defect chaos in Rayleigh-Benard convection: Asymptotic and numeric study of azimuthal flows induced by rotating spirals.
- Anisotropic disclination cores in nematic liquid crystals modeled by a self consistent molecular field theory.
Topological defect motion, microstructure, and stress response in materials
- Impact of lattice rotation on dislocation motion.
- Dislocation dynamics and crystal plasticity in the phase field crystal model.
- Separation of elastic and plastic time scales in a phase field crystal model.
- A coarse-grained phase-field crystal model of plastic motion.
- Field Dislocation Mechanics and Phase Field Crystal models
Transport in nematic suspensions
- Liquid crystals with patterned molecular orientation as an electrolytic active medium.
- Electrokinetic flows in liquid crystal thin films with fixed anchoring
- Nonlinear electrophoresis of colloids controlled by anisotropy of conductivity and permittivity of liquid crystal electrolyte
- Q-tensor model for electrokinetics in nematic liquid crystals.
- Electrokinetic effects in nematic suspensions: Single particle electroosmosis and inter particle interactions.
- A connection between Living Liquid Crystals and electrokinetic phenomena in nematic fluids.
Advisees & Collaborators
Graduate Students
- Lucas Myers
- Cody Schimming