Current situation: Associate professor, University of bordeaux (UB)

Contact

Office# 115
Paul Pascal Research Center (CRPP), UMR 5031, 115 Avenue Dr. A. Schweitzer 33600 Pessac, France
Tel : (+33) 5 56 84 56 30
Fax : (+33) 5 56 84 56 00
Email : jean-christophe.loudet[AT]u-bordeaux.fr

Research interest: Soft condensed matter physics

Keywords

Colloidal systems (dispersions, emulsions), liquid crystals, elasticity, topological defects, phase separation, Brownian motion, fluid interfaces, surface tension, wetting, capillary interactions, light scattering, radiation pressure, instabilities and dynamical systems. Numerical calculations, computational fluid dynamics.

Current and recent projects

• Behavior of solid particles trapped at liquid crystal (LC) fluid interfaces. Computational Fluid Dynamics (CFD) simulations using Finite Elements. Coupling between elastic and capillary phenomena. Landau-de Gennes theory (LC phase) combined with the Phase-Field method (interfacial dynamics).
• Hot particles adsorbed at the water-air interface. Heat transfer and Marangoni flows. Flow instability and colloidal micro-swimmer.
• Mechanical effects of light on solid particles. Levitation and optical trapping. Influence of the size, shape and nature of the particles. Instabilities and dynamical systems (bifurcation, chaos).
• Fluid interfaces (liquid-liquid and liquid-gas; isotropic systems) and solid inclusions. Influence of size and shape of particles on contact lines (wetting) and capillary interactions.

Skills

Computational – Finite Elements simulations with COMSOL Multiphysics (CFD module). Codes (fortran) for solving boundary value problems with the Boundary Element Methods (BEM). Codes for image analysis (phase unwrapping in interferograms). Codes for computing radiation pressure forces and torques exerted on anisotropic solid particles (ray optics treatment only). Codes for simulating optical microscopy images between crossed polarizers (Jones’ method). Codes for simple Molecular Dynamics and Brownian simulations.

Experimental – Formulation of bulk colloidal systems (emulsions, dispersions, surfactants, polymers, gels, liquid crystals) and at fluid interfaces. Levitation and optical trapping (force measurement). Interferometry. Optical microscopy and derived techniques (fluorescence, phase contrast). Light scattering. Freeze fracture on lyotropic liquid crystals. Calorimetry.

Research grants

• European Marie-Curie grant, H2020-MSCA-IF-GF 794837 “CoPEC”, Colloidal Particles in Elasto-Capillary fields, 2018-2021, as coordinator. Partner: University of Bristish Columbia (Vancouver, Canada), James J. Feng’s research group.
• National Research Agency grant “AMO-COPS”, Advanced Methods for Optical Characterization of Complex Particle Systems, 2013-2017, as partner (coordinator: Prof. K. F. Ren, Univ. Rouen).
• European ITN (Initial Training Network) Marie-Curie grant (FP7) “COMPLOIDS”, Physics of Complex Colloids: Equilibrium and Driven, 2009-2013, as partner (coordinator: Prof. C. N. Likos, Univ. Vienna).
• National Research Agency grant “PACTIS”, PArticles in Complex fluids: Transition-Induced Structures, 2007-2011, as coordinator.

Teaching activities

List of recent courses and lectures

• ŸIntroduction to Thermodynamics (undergraduate level), with lab practice.
• ŸChemical equilibria and introduction to the kinetics of chemical reactions (undergraduate level), with lab practice.
• ŸGeneral properties of colloidal systems (undergraduate level), with lab practice.
• ŸDielectric and magnetic properties of matter (undergraduate level).
• ŸApplied Mathematics for physicists and chemists (undergraduate level).
• ŸStatistical Thermodynamics (master level).
• ŸPhase transitions and Landau theory (master level).

List of publications

36-Koleski G, Loudet JC, Vilquin A, Pouligny B, Bickel T. Surfactant-driven instability of a divergent flow, accepted in Phys. Rev. Fluids.

35-Hemauer J, Qiu M, Feng JJ, Loudet JC. Particle rotation speeds up capillary interactions, Eur. Phys. J. E 44:30-1–11, 2021. https://doi.org/10.1140/epje/s10189-021-00025-w .

34-Qiu M, Feng JJ, Loudet JC. Phase-field model for elasto-capillary flows of liquid crystals, Phys. Rev. E 103:022706-1–14, 2021. DOI 10.1103/PhysRevE.103.022706.

33-Koleski G, Vilquin A, Loudet JC, Bickel T, Pouligny B. Azimuthal instability of the radial thermocapillary flow around a hot bead trapped at the water-air interface, Physics of Fluids 32:092108-1–11, 2020. DOI 10.1063/5.0018711.

32-Loudet JC, Qiu M, Hemauer J, Feng JJ. Drag force on a particle straddling a fluid interface: Influence of interfacial deformations, Eur. Phys. J. E 43:13, 2020. DOI 10.1140/epje/i2020-11936-1.

31-Bickel T, Loudet JC, Koleski G, Pouligny B. Hydrodynamic response of a surfactant-laden interface to a radial flow, Phys. Rev. Fluids, 4:124002-1–18, 2019. DOI 10.1103/PhysRevFluids.4.124002.

30-Loudet JC, Selmi M, Dolganov PV, Othman T, Cluzeau P. Stripe instabilities in the menisci of free-standing smectic films: Influence of the phase sequence of the mesogenic material, Liquid Crystals, 45(10):1415-1418, 2018.

29-Selmi M, Loudet JC, Dolganov PV, Othman T, Cluzeau P. Structures in the meniscus of smectic membranes : role of dislocations ? Soft Matter 17:3649-3663, 2017.

28-Petkov T, Pouligny B, Ren KF, Loudet JC. Behaviors of ellipsoidal microparticles within a two-beam optical levitator, J. Quant. Spec. & Rad. Trans 195:85-96, 2016.

27-Girot A, Danné N, Würger A, Bickel T, Ren KF, Loudet JC, Pouligny B. Motion of optically-heated spheres at the water-air interface. Langmuir 32:2687-2697, 2016.

26-Yang M, Ren KF, Petkov T, Pouligny B, Loudet JC, Sheng X. Computational study of radiation torque on arbitrary shaped particle with MLFMA. Optics Express 23(18):23365-23379, 2015.

25-Loudet JC, Mihiretie BM, Pouligny B. Optically driven oscillations of ellipsoidal particles. Part II: Ray-optics calculations. Eur. Phys. J. E 37:125-1–15, 2014.

24-Mihiretie BM, Snabre P, Loudet JC, Pouligny B. Optically driven oscillations of ellipsoidal particles. Part I: Experimental observations. Eur. Phys. J. E 37:124-1–17, 2014.

23-Mondiot F, Botet R, Snabre P, Mondain-Monval O, Loudet JC. Colloidal Aggregation and dynamics in anisotropic fluids. Proc. Natl. Acad. Sci. USA 111(16):5831-5836, 2014.

22-Tasinkevych M, Mondiot F, Mondain-Monval O, Loudet JC. Dispersions of ellipsoidal particles in a nematic liquid crystal. Soft Matter 10:2047-2058, 2014.

21-Mihiretie BM, Loudet JC, Pouligny B. Optical levitation and long-working-distance-trapping : from spherical up to high aspect ratio ellipsoidal particles. J. Quant. Spec. & Rad. Trans. 126:61-68, 2013.

20-Mihiretie BM, Snabre P, Loudet JC, Pouligny B. Radiation pressure makes ellipsoidal particle tumble. Europhys. Lett. 100:48005-1–6, 2012.

19-Mondiot F, Loudet JC, Mondain-Monval O, Snabre P, Vilquin A, Würger A. Stokes-Einstein diffusion of colloids in nematics. Phys. Rev. E 86:010401(R)-1–5, 2012.

18-Prathap Chandran S, Mondiot F, Mondain-Monval O, Loudet JC. Photonic control of surface anchoring on solid colloids dispersed in liquid crystals. Langmuir 27:15185-15198, 2011.

17-Loudet JC, Pouligny B. How do mosquito eggs self-assemble at the water surface? Eur. Phys. J. E 34:76-1–17, 2011, cover of the magazine.

16-Loudet JC, Dolganov PV, Patrício P, Saadaoui H, Cluzeau P. Undulation instabilities in the meniscus of smectic membranes. Phys. Rev. Lett. 106:117802-1–4, 2011.

15-Mondiot F, Prathap Chandran S, , Mondain-Monval O, Loudet JC. Shape-induced dispersion of colloids in anisotropic fluids. Phys. Rev. Lett. 103:238303-1–4, 2009.

14-Loudet JC, Pouligny B. Self-assembled capillary arrows. Europhys. Lett. 85:28003-1–6, 2009.

13-Loudet JC, Yodh AG, Pouligny B. Wetting and contact lines of micrometer-sized ellipsoids. Phys. Rev. Lett. 97:018304-1–4, 2006.

12-Loudet JC, Alsayed AM, Zhang J, Yodh AG. Capillary interactions between anisotropic colloidal particles. Phys. Rev. Lett. 94:018301-1–4, 2005.

11-Loudet JC. Colloidal inclusions in liquid crystals: Phase separation mechanisms and some dynamical aspects. Liquid Crystals Today 14:1-14, 2005.

10-Loudet JC, Hanusse P, Poulin P. Stokes drag on a sphere in a nematic liquid crystal. Science 306:1525, 2004.

09-Loudet JC, Richard H, Auroy P, Keller P, Poulin P. Colloidal structures from bulk demixing in liquid crystals. Langmuir 20:11336-11347, 2004, cover of the magazine.

08-Loudet JC, Poulin P. Monodisperse aligned emulsions from demixing in bulk liquid crystals. Top. Curr. Chem. 226:173-196, 2003.

07-Loudet JC, Poulin P. Liquid crystal emulsions. J. Disp. Sci. Tech. 23:143-154, 2002.

06-Loudet JC, Mondain-Monval O, Poulin P. Line defect dynamics around a colloidal particle. Eur. Phys. J. E 7:205-208, 2002.

05-Loudet JC, Poulin P. Application of an electric field to colloidal particles suspended in a liquid crystal solvent. Phys. Rev. Lett. 87:165503-1–4, 2001.

04-Loudet JC, Poulin P, Barois P. Edge dislocations of colloidal chains suspended in a nematic liquid crystal. Europhys. Lett. 54:175-181, 2001.

03-Pincet F, Perez E, Loudet JC, Lebeau L. From macroscopic adhesion energy to molecular bonds: A test of the theory. Phys. Rev. Lett. 87:178101-1–4, 2001.

02-Loudet JC, Barois P, Poulin P. Colloidal ordering from phase separations in a liquid crystalline continous phase. Nature 407:611-613, 2000.

01-Loudet JC, Richard H, Sigaud G, Poulin P. Non-aqueous liquid crystal emulsions. Langmuir 16 :6724-6730, 2000.