Jorge Viñals
Director of Graduate Studies
Professor, School of Physics and Astronomy
Contact
130-17 John T. Tate Hall
116 Church Street Se
Minneapolis, MN 55455
Affiliations
Jorge Viñals
Director of Graduate Studies
Professor, School of Physics and Astronomy
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.
Education
Ph.D., University of Barcelona, Spain
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.
Publications
2023
Schimming, C., Viñals, J. (2023). Kinematics and dynamics of disclination lines in three-dimensional nematics. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 479 (2273), [20230042].
DOI: 10.1098/rspa.2023.0042
2022
Skogvoll, V., Angheluta, L., Skaugen, A., Salvalaglio, M., Viñals, J. (2022). A phase field crystal theory of the kinematics of dislocation lines. Journal of the Mechanics and Physics of Solids. [104932].
DOI: 10.1016/j.jmps.2022.104932
Acharya, A., Angheluta, L., Viñals, J. (2022). Elasticity versus phase field driven motion in the phase field crystal model. Modelling and Simulation in Materials Science and Engineering. 30 (6), [064005].
DOI: 10.1088/1361-651X/ac860b
Schimming, C., Viñals, J. (2022). Equilibrium morphology of tactoids in elastically anisotropic nematics. Soft Matter. 18 (41), [8024-8033].
DOI: 10.1039/d2sm00323f
Schimming, C., Viñals, J. (2022). Singularity identification for the characterization of topology, geometry, and motion of nematic disclination lines. Soft Matter. 18 (11), [2234-2244].
DOI: 10.1039/d1sm01584b
2021
Skogvoll, V., Skaugen, A., Angheluta, L., Viñals, J. (2021). Dislocation nucleation in the phase-field crystal model. Physical Review B. 103 (1), [014107].
DOI: 10.1103/PhysRevB.103.014107
Schimming, C., Viñals, J., Walker, S.W. (2021). Numerical method for the equilibrium configurations of a Maier-Saupe bulk potential in a Q-tensor model of an anisotropic nematic liquid crystal. Journal of Computational Physics. [110441].
DOI: 10.1016/j.jcp.2021.110441
Vitral, E., Leo, P.H., Viñals, J. (2021). Phase-field model for a weakly compressible soft layered material: morphological transitions on smectic-isotropic interfaces. Soft Matter. 17 (25), [6140-6159].
DOI: 10.1039/d1sm00488c
2020
Salvalaglio, M., Angheluta, L., Huang, Z.F., Voigt, A., Elder, K.R., Viñals, J. (2020). A coarse-grained phase-field crystal model of plastic motion. Journal of the Mechanics and Physics of Solids. [103856].
DOI: 10.1016/j.jmps.2019.103856
Schimming, C., Viñals, J. (2020). Anisotropic disclination cores in nematic liquid crystals modeled by a self-consistent molecular field theory. Physical Review E. 102 (1), [010701].
DOI: 10.1103/PhysRevE.102.010701
Schimming, C.D., Viñals, J. (2020). Computational molecular field theory for nematic liquid crystals. Physical Review E. 101 (3), [032702].
DOI: 10.1103/PhysRevE.101.032702
Gaudreault, M., Drolet, F., Vinãls, J. (2020). Erratum: Bifurcation threshold of the delayed van der Pol oscillator under stochastic modulation [Phys. Rev. e 85, 056214 (2012)]. Physical Review E. 101 (2), [029901].
DOI: 10.1103/PhysRevE.101.029901
Acharya, A., Viñals, J. (2020). Field dislocation mechanics and phase field crystal models. Physical Review B. 102 (6), [064109].
DOI: 10.1103/PhysRevB.102.064109
Vitral, E., Leo, P.H., Vinãls, J. (2020). Model of the dynamics of an interface between a smectic phase and an isotropic phase of different density. Physical Review Fluids. 5 (7), [073302].
DOI: 10.1103/PhysRevFluids.5.073302
Vitral, E., Mukherjee, S., Leo, P.H., Viñals, J., Paul, M.R., Huang, Z.F. (2020). Spiral defect chaos in Rayleigh-Bénard convection: Asymptotic and numerical studies of azimuthal flows induced by rotating spirals. Physical Review Fluids. 5 (9), [093501].
DOI: 10.1103/PhysRevFluids.5.093501
2019
Vitral, E., Leo, P.H., Viñals, J. (2019). Role of Gaussian curvature on local equilibrium and dynamics of smectic-isotropic interfaces. Physical Review E. 100 (3), [032805].
DOI: 10.1103/PhysRevE.100.032805
2018
Conklin, C., Viñals, J., Valls, O.T. (2018). A connection between living liquid crystals and electrokinetic phenomena in nematic fluids. Soft Matter. 14 (22), [4641-4648].
DOI: 10.1039/c7sm02492d
Skaugen, A., Angheluta, L., Viñals, J. (2018). Dislocation dynamics and crystal plasticity in the phase-field crystal model. Physical Review B. 97 (5), [054113].
DOI: 10.1103/PhysRevB.97.054113
Conklin, C., Tovkach, O.M., Viñals, J., Calderer, M.C., Golovaty, D., Lavrentovich, O.D., Walkington, N.J. (2018). Electrokinetic effects in nematic suspensions: Single-particle electro-osmosis and interparticle interactions. Physical Review E. 98 (2), [022703].
DOI: 10.1103/PhysRevE.98.022703
Skaugen, A., Angheluta, L., Viñals, J. (2018). Separation of Elastic and Plastic Timescales in a Phase Field Crystal Model. Physical review letters. 121 (25), [255501].
DOI: 10.1103/PhysRevLett.121.255501
2017
Conklin, C., Viñals, J. (2017). Electrokinetic flows in liquid crystal thin films with fixed anchoring. Soft Matter. 13 (4), [725-739].
DOI: 10.1039/c6sm02393b
Paladugu, S., Conklin, C., Viñals, J., Lavrentovich, O.D. (2017). Nonlinear Electrophoresis of Colloids Controlled by Anisotropic Conductivity and Permittivity of Liquid-Crystalline Electrolyte. Physical Review Applied. 7 (3), [034033].
DOI: 10.1103/PhysRevApplied.7.034033
Tovkach, O.M., Conklin, C., Calderer, M.C., Golovaty, D., Lavrentovich, O.D., Viñals, J., Walkington, N.J. (2017). Q-tensor model for electrokinetics in nematic liquid crystals. Physical Review Fluids. 2 (5), [053302].
DOI: 10.1103/PhysRevFluids.2.053302
2016
Perreault, B., Viñals, J., Rickman, J.M. (2016). Impact of lattice rotation on dislocation motion. Physical Review B. 93 (1), [014107].
DOI: 10.1103/PhysRevB.93.014107
2015
Lavrentovich, O.D., Peng, C., Guo, Y., Shiyanovskii, S., Wei, Q., Vinals, J., Conklin, C. (2015). Liauid crystal enabled electrokinetics. In Annual Meeting of the American Electrophoresis Society 2015, AES 2015 - Topical Conference at the 2015 AIChE Annual Meeting. (161-171). (Annual Meeting of the American Electrophoresis Society 2015, AES 2015 - Topical Conference at the 2015 AIChE Annual Meeting.). AIChE.
Peng, C., Guo, Y., Conklin, C., Viñals, J., Shiyanovskii, S.V., Wei, Q.H., Lavrentovich, O.D. (2015). Liquid crystals with patterned molecular orientation as an electrolytic active medium. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 92 (5), [052502].
DOI: 10.1103/PhysRevE.92.052502
2013
Yoo, C.D., Viñals, J. (2013). The role of viscoelastic contrast in orientation selection of block copolymer lamellar phases under oscillatory shear. Soft Matter. 9 (32), [7817-7831].
DOI: 10.1039/c3sm00099k
2012
Yoo, C.D., Viñals, J. (2012). Anisotropic linear response in block copolymer lamellar phases. Macromolecules. 45 (11), [4848-4856].
DOI: 10.1021/ma300547y
Gaudreault, M., Drolet, F., Viñals, J. (2012). Bifurcation threshold of the delayed van der Pol oscillator under stochastic modulation. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 85 (5), [056214].
DOI: 10.1103/PhysRevE.85.056214
2011
Gaudreault, M., Berbert, J.M., Viñals, J. (2011). Correlation times in stochastic equations with delayed feedback and multiplicative noise. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 83 (1), [011903].
DOI: 10.1103/PhysRevE.83.011903
2010
Gaudreault, M., Drolet, F., Viñals, J. (2010). Analytical determination of the bifurcation thresholds in stochastic differential equations with delayed feedback. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 82 (5), [051124].
DOI: 10.1103/PhysRevE.82.051124
2009
Gaudreault, M., Viñals, J. (2009). Collapse transition of a hydrophobic self-avoiding random walk in a coarse-grained model solvent. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 80 (2), [021916].
DOI: 10.1103/PhysRevE.80.021916
Viñals, J. (2009). Defect dynamics in mesophases. Journal of the Physical Society of Japan. 78 (4), [041011].
DOI: 10.1143/JPSJ.78.041011
Gaudreault, M., Lépine, F., Viñals, J. (2009). Pitchfork and Hopf bifurcation thresholds in stochastic equations with delayed feedback. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 80 (6), [061920].
DOI: 10.1103/PhysRevE.80.061920
2008
Tamate, R., Yamada, K., Viñals, J., Ohta, T. (2008). Structural rheology of microphase separated diblock copolymers. Journal of the Physical Society of Japan. 77 (3), [034802].
DOI: 10.1143/JPSJ.77.034802
2007
Yeh, S.S., Hsueh, C., Chen, P., Viñals, J. (2007). Field-induced columnar structures in a quasi-two-dimensional system of dipolar particles. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 76 (5), [051407].
DOI: 10.1103/PhysRevE.76.051407
Huang, Z.F., Viñals, J. (2007). Grain boundary dynamics in stripe phases of nonpotential systems. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 75 (5), [056202].
DOI: 10.1103/PhysRevE.75.056202
Huang, Z.F., Viñals, J. (2007). Stability of parallel/perpendicular domain boundaries in lamellar block copolymers under oscillatory shear. Journal of Rheology. 51 (1), [99-123].
DOI: 10.1122/1.2399088
2006
Huang, Z.F., Viñals, J. (2006). Orientation selection in lamellar phases by oscillatory shears. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 73 (6), [060501].
DOI: 10.1103/PhysRevE.73.060501
2005
Huang, Z.F., Viñals, J. (2005). Tilt grain boundary instabilities in three-dimensional lamellar patterns. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 71 (3), [031501].
DOI: 10.1103/PhysRevE.71.031501
Rickman, J.M., Viñals, J., Lesar, R. (2005). Unified framework for dislocation-based defect energetics. Philosophical Magazine. 85 (9), [917-929].
DOI: 10.1080/14786430412331314618
2004
Vega, J.M., Rüdiger, S., Viñals, J. (2004). Phenomenological model of weakly damped Faraday waves and the associated mean flow. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 70 (4 2), [046306]. [046306-1-046306-18].
DOI: 10.1103/PhysRevE.70.046306
Huang, Z.F., Viñals, J. (2004). Shear-induced grain boundary motion for lamellar phases in the weakly nonlinear regime. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 69 (4), [041504].
DOI: 10.1103/PhysRevE.69.041504
2003
Huang, Z.F., Drolet, F., Viñals, J. (2003). Motion of a transverse/parallel grain boundary in a block copolymer under oscillatory shear flow. Macromolecules. 36 (25), [9622-9630].
DOI: 10.1021/ma034083q
2002
Boyer, D., Viñals, J. (2002). Grain boundary pinning and glassy dynamics in stripe phases. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 65 (4), [046119]. [046119/1-046119/12].
DOI: 10.1103/PhysRevE.65.046119
Chen, P., Viñals, J. (2002). Lamellar phase stability in diblock copolymers under oscillatory shear flows. Macromolecules. 35 (10), [4183-4192].
DOI: 10.1021/ma011586s
Mullins, W.W., Viñals, J. (2002). Linear bubble model of abnormal grain growth. Acta Materialia. 50 (11), [2945-2954].
DOI: 10.1016/S1359-6454(02)00121-0
Viñals, J., Kolinski, A., Skolnick, J. (2002). Numerical study of the entropy loss of dimerization and the folding thermodynamics of the GCN4 leucine zipper. Biophysical journal. 83 (5), [2801-2811].
DOI: 10.1016/S0006-3495(02)75289-2
Boyer, D., Viñals, J. (2002). Weakly nonlinear theory of grain boundary motion in patterns with crystalline symmetry. Physical review letters. 89 (5), [055501]. [055501/1-055501/4].
DOI: 10.1103/PhysRevLett.89.055501
2001
Drolet, F., Viñals, J. (2001). Adiabatic elimination and reduced probability distribution functions in spatially extended systems with a fluctuating control parameter. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 64 (2), [026120]. [261201-261208].
DOI: 10.1103/PhysRevE.64.026120
Graduate Students
- Lucas Myers
- Cody Schimming