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Univ. Paris-Saclay


Fabrice COUSIN

Laboratoire Léon Brillouin
Groupe Interfaces et materiaux

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Co-responsible of the Time-of-Flight reflectometer EROS

Local contact on EROS and on the SANS machines of LLB (PACE,PAXE,PAXY)

Responsible of the coffee of the third floor of LLB

Research Topics

Scientific interest in Soft Matter, including :

  • Complexation of polyelectrolyte and proteins
  • Polymers at interfaces
  • Magnetic nanocomposites
  • Structure and phase behavior of colloidal suspensions

Main techniques : Neutron Reflectivity, Small Angle Neutron Scattering 


  • Since 2003 : Researcher at Laboratoire Léon Brillouin
  • 2001-2003 : Post-doctoral stay at the Laboratoire Léon Brillouin
  • 2000-2001 : Military service at the Centre d'Etudes Scientifiques et Techniques d'Aquitaine
  • 1997-2000 : PhD in Physical Chemistry (Université Pierre et Marie Curie, Paris VI) at the LI2C laboratory : 'Comportement de phase de colloïdes sphériques et plaquettaires'
  • 1994-1997 : Magistère de physique fondamentale d'Orsay (Université Paris XI)

Scientific Publications


M. R. Tomlinson, F. Cousin, M. Geoghegan, Creation of dense polymer brush layers by the deposition of an amphiphilic responsive comb polymer, Polymer, 2009, 50(20), 4829-4836.

A. Galicia, F. Cousin V. Cabuil, E. Dubois, O. Sandre, R. Perzynski, Static and dynamic structural probing of swollen Polyacrylamide ferrogels, Soft Matter, 2009, 5, 2614-2624.

I. Schmidt, F.Cousin, C. Huchon, F.  Boué,  M. Axelos, Spatial structure and composition of polysaccharide-protein complexes from Small Angle Neutron Scattering, Biomacromolecules, 2009, 10, 1346-1357.

E. Wandersman, E. Dubois, F. Cousin, V. Dupuis, G. Mériguet, R. Perzynski, A.Cebers, Relaxation of the field-induced structural anisotropy of a rotating magnetic liquid, EPL, 2009, 86, 10005.  

F. Vial, F. Cousin, L. Bouteiller, C. Tribet, Rate of permeabilization of giant vesicles by amphiphilic polyacrylates compared to the adsorption of the polymer onto LUVs and thetered lipid bilayers, Langmuir, 2009, 25(13), 7506-7513.

S. Douadi-Masrouki, B. Frka-Petesic, O. Sandre, F.Cousin, V.Dupuis, R. Perzynski, V.Cabuil, Neutron reflectivity on polymer multilayers doped with magnetic nanoparticles, Solid State Phenomena, 2009, 152-153, 194-197. 

F. Cousin, J. Jestin, G. Chaboussant, S. Gautrot, A. Menelle, F. Ott, Probing simultaneously the volume and surface structure of nanospheres adsorbed at a liquid-solid interface by GISANS, Eur. Phys. Jour. Special Topics, 2009, 168, 177-183

N. Jouault, Y. Corvis, F. Cousin, J. Jestin, L. Barré, Asphaltene adsorption mechanisms at the local scale probed by neutron reflectivity: transition from mono to multilayer growth above flocculation threshold, Langmuir, 2009, 25(7), 3991-3998

S. Al Akhrass, F. Gal, P. Alcouffe, D. Damiron, C. J. Hawker, F. Cousin, G. Carrot, E. Drockenmuller, Design of Cross-linked Hybrid Multilayer Thin Films from azido-functionalized Polystyrenes and Platinum Nanoparticles, Soft Matter, 2009, 5, 586-592.

B. Jean, L. Heux, F. Dubreuil, G. Chambat, F. Cousin, Non-Electrostatic Building of Biomimetic Cellulose-Xyloglucan Multilayers, Langmuir (Letter), 2009, 25(7), 3920-3923.

I. Grillo, J. Penfold, I. Tucker, F Cousin, Spontaneous formation of nano-vesicles in mixtures of nonionic and di-alkyl chain cationic surfactants studied by surface tension and SANS, Langmuir, 2009, 25(7), 3932-3943.

O. Félix, Z. Zheng, F. Cousin, G. Decher, Are sprayed LBL-films stratified? A first assessment of the nanostructure of spray-assembled multilayers by neutron reflectometry, C. R. Chimie, 2009, 12, 225-234.      

A.-S. Robbes, F. Cousin, G. Mériguet, Osmotic stress on concentrated colloidal suspensions: a path towards equilibrium?, Braz. J. of Physics, 2009, 37(1A), 156-162


J. Fresnais, J.-F. Berret, L. Qi, J.-P. Chapel, J.-C. Castaing, O. Sandre, B. Frka- Petesic, R. Perzynski, J. Oberdisse, F. Cousin, Universal scattering behavior of coassembled nanoparticle-polymer clusters, Phys. Rev. E (Rapid communication), 2008, 78, 040401.

 S. Seng Chang, A. B. Rodríguez, A. M. Higgins, C. Liu, M. Geoghegan, H. Sirringhaus, F. Cousin, R. Dalgleish, Y. Deng, Control of roughness at interfaces and the impact on charge mobility in all-polymer field-effect transistors, Soft Matter, 2008, 4, 2220-2224.

F.Cousin, V.Cabuil, I. Grillo, P. Levitz, Competition between entropy and electrostatic interactions in a binary colloidal mixture of spheres and platelets, Langmuir, 2008, 24(20), 11422-11430

W. Beziel, G. Fragneto, F. Cousin, M. Sferrazza, Neutron reflectivity study of the kinetics of polymer-polymer interface formation, Phys. Rev. E (brief report), 2008, 78, 022801

J. Gummel, F. Boué, D. Clemens, F.Cousin, Finite size and inner structure controlled by electrostatic screening in globular complexes of proteins and polyelectrolytes, Soft Matter, 2008, 4, 1653-1664.

L. Qi, A. Sehgal, J-C. Castaing, J-P. Chapel, J. Fresnais, J-F. Berret, F. Cousin, Redispersible Hybrid Nanopowders: Cerium Oxide Nanoparticle Complexes with Phosphonated-PEG OligomersACS Nano, 2008, 2(5), 879-888.

K. Mergia, D. Lafatzis, N. Moutis, Th. Speliotis, G. Apostolopoulos, F. Cousin, Oxidation behaviour of SiC coatings, Applied Physics A., 2008, 92,  387-395.

J. Jestin, F. Cousin, I. Dubois, C. Ménager, J. Oberdisse , R. Schweins, F. Boué, Anisotropic reinforcement of nanocomposites tuned by magnetic orientation of the filler network,  Advanced Materials, 2008, 20(13), 2533-2540.

J. Gummel, F.Cousin, F. Boué, Structure transition in PSS-lysozyme complexes: a conformation driven process, as directly seen by Small Angle Neutron Scattering, Macromolecules, 2008, 41(8), 2898-2907.

B. Jean, F. Dubreuil, L. Heux, F.Cousin, Structural details of cellulose nanocrystals/polyelectrolytes multilayers probed by neutron reflectivity and AFM, Langmuir, 2008, 24(7), 3452-3558.


F. Boué, F.Cousin, J.Gummel, G. Carrot, J. Oberdisse, A. El Harrak, Small angle scattering from soft matter - application to complex mixed systems, C. R. Physique, 2007, 8, 821-844.

J.Gummel, F.Cousin, J-M.Verbavatz, F. Boué, Wide scale range structure in polyelectrolyte-protein globular complexes: where SANS meets freeze-fracture microscopy, J. Phys. Chem. B, 2007, 111, 8540-8546.   

J.Gummel, F.Cousin, F.Boué, Counterions release from electrostatic complexes of polyelectrolytes and proteins of opposite charge: a direct measurement, J. Am. Chem. Soc. (communication), 2007, 129(18), 5806-5807.

M. Mukherjee, A.Singh, J.Daillant, A. Menelle, F. Cousin, Effect of Solvent-Polymer Interaction in Swelling Dynamics of Ultrathin Polyacrylamide Films: A Neutron and X-ray Reflectivity Study, Macromolecules, 2007, 40, 1073-1080.

C. Rivière, C. Wilhelm, F. Cousin, F. Gazeau, V.Dupuis, R.Perzynski, Internal structure of magnetic endosomes, Eur. Phys. Jour. E, 2007, 22(1), 1-10.


J. Gummel, F. Boué, B. Demé, F. Cousin, Charge stoechiometry inside polyelectrolyte-protein complexes: a direct SANS measurement for the PSSNa-Lysozyme system, J. Phys. Chem. B, 2006, 110(49), 24837-24846.

G. Mériguet, F. Cousin, E. Dubois, F. Boué, A. Cebers, B. Farago, R. Perzynski, What tunes the anisotropy of the structure of magnetic fluids under a magnetic field ?, J. Phys. Chem. B, 2006, 110(9), 4378 - 4386.


F. Cousin, J. Gummel, D. Ung, F. Boué, Polyelectrolyte-protein complexes: structure and conformation of each specie revealed by SANS, Langmuir, 2005, 21(21), 9675-9688.

C. Devaux, F. Cousin, E. Beyou, J-P. Chapel, Highly Stretched Polymer Brushes with a low swelling capacity, Macromolecules,  2005, 38(10), 4296-4300.


F. Ott, F. Cousin, A. Menelle, Surfaces and interfaces characterization by neutron reflectometry , Journal of Alloys and Compounds, 2004, 382(1-2), 29-38.


F. Cousin, J. Oberdisse, F. Boué, SANS studies of hybrid Nanostystems, Neutron News, 2003, 14(3), 31-34.

A. Menelle, J. Jestin, F.Cousin, Liquid interfaces investigated by Neutron Reflectivity, Neutron News, 2003, 14(3), 26-30.

F.Cousin, E. Dubois., V.Cabuil, Tuning the interactions of a magnetic colloidal dispersion, Phys. Rev. E, 2003, 68(2), 021405.

J. Galicia, O. Sandre, F.Cousin, D. Guemghar, C. Ménager, V. Cabuil, Designing magnetic composite materials using aqueous magnetic fluids, J. Phys. : Condens. Matter, 2003, 15(15), S1379-S1402.


F.Cousin, V.Cabuil, P.Levitz, Magnetic colloidal particles as probes for the determination of the structure of laponite suspensions, Langmuir, 2002, 18(5), 1466-1473


F.Cousin, E. Dubois, V.Cabuil, F. Boué, R. Perzynski, Overview of the phase diagram of ionic magnetic colloidal dispersion, Braz. J. of Physics, 2001, 31(3), 350-355.

F.Cousin, E. Dubois, V.Cabuil, Approach of the critical point of gas-liquid transitions in an electrostatically stabilized colloidal suspension, J. Chem. Phys., 2001, 115(13), 6051-6057.


F. Cousin, V. Cabuil, Fluid-solid transitions in aqueous magnetic colloid suspension, Prog. Colloid Polymer Sci., 2000, 115, 77.


F.Cousin, V.Cabuil, Osmotic pressure of electrostatically stabilized magnetic fluids, J. Mol. Liq., 1999, 83, 203-215.

Book chapter :

F. Cousin, A. Menelle, La réflectivité de neutrons in « Techniques innovantes pour la caractérisation optique microstructurale de couches minces », Coordinateurs Ayral André  Rouessac Vincent, CNRS Editions, collection 'Sciences et Techniques de l'Ingénieur', published in 2006.


Guest editor with Michèle Sauvage (SOLEIL) and Jean Daillant (LIONS Saclay) of a special issue in European Journal of Physics Special Topics, associated with the conference SXNS 10, 2009, vol 167 (29 articles, 197 pages) 


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