PHOTO


Patrick GUENOUN
Senior researcher, Head of  the Laboratoire sur l'Organisation Nanométrique et Supramoléculaire (LIONS)
NIMBE, C.E.A. Saclay, 91191 Gif sur Yvette Cedex, France
Phone: (33)-01-69-08-74-33
Fax: (33)-01-69-08-66-40
E-mail: Patrick.Guenoun@cea.fr



Research interests

- Polymers and polyelectrolytes at interfaces, charged brushes,
-Polymers in solution, water soluble polymers, micelles, surfactants.
- Wetting, thin films and adsorption.
-Biomineralization:  nacre modeling and amyloid-like peptides
- Critical phenomena in fluids and polymer solutions, phase separation, thermal transport .
- Experimental techniques : scattering, atomic force microscopy, optics.

Education

1979 Ecole Normale Supérieure (Cachan)
1982 Agrégation of Physics, Physics
1984-1987 PhD (Physics) Université Paris VI (Physics)
 “Instability of fluid mixtures, influence of gravity forces and wetting”,
1998 Habilitation à diriger des recherches, Université Paris VI

Employment

1987-2003 Permanent staff member at the Service de Physique de l'Etat Condensé, C.E.A. Saclay
1991-1992 Research Associate at the Department of Chemical Engineering and Materials Science
with M. Tirrell (University of Minnesota, Minneapolis (1991-1992))
2003- Permanent staff member at the LIONS, C.E.A. Saclay

Professional activities

-Organiser of the Rencontre de Moriond “Short and Long Chains at Interfaces”, Villars sur Ollon, Suisse, January 1995
-Organiser of the Euroconference “Chains@Interfaces 2001”, Evora, Portugal, January 2001
-Member of the Scientific Committee of the Laboratoire Léon Brillouin (1999-2001 )
-President of the Condensed Matter Sciences Group of C.N.E.S. (Centre national d’Etudes Spatiales)
-Member of the MAP panel of the European Space Agency (E.S.A. 2004-2005)
-Member of the Physical Sciences Advisory Group of E.S.A.
-Member of the "Soft matter" committee at Institute Laüe-Langevin (ILL) (2008-2011)
-Member of the selection committee at E.S.R.F. (2012-2014)
-Nanochemistry responsible with C. Chanéac of Nano'K Ile de France
-Head of Laboratoire sur l'Organisation Nanométrique et Supramoléculaire (LIONS) since 2010

On-going projects

Invertible and multiple emulsions : how to form one-step, stable multiple emulsions ?

Ph. D thesis of Marine Protat in collaboration with P. Perrin and N. Pantoustier (SIMM, ESPCI Paris)

Multiple emulsions, like water in oil in water drops, usually need two surfactants (one for each interface) and are barely stable. By using block copolymers with a hydrophobic moiety and a thermosensitive hydrophilic charged moiety (like in Marchal F, Roudot A, Pantoustier N, et al. JOURNAL OF PHYSICAL CHEMISTRY B   Volume: 111   Issue: 46   Pages: 13151-13155 (2007), http://dx.doi.org./10.1021/jp0749827), things change a lot: a single molecule is enough to stabilize for months multiple emulsions in a range of pHs (Besnard, L.; Marchal, F.; Paredes, J. F.; Daillant, J.; Pantoustier, N.; Perrin, P. & Guenoun, P. Multiple Emulsions Controlled by Stimuli-Responsive Polymers, ADVANCED MATERIALS, (2013), 25, 2844-2848). How far this is due to polymer conformation at the oil-water interface is explained in Besnard, L.; Protat, M.; Malloggi, F.; Daillant, J.; Cousin, F.; Pantoustier, N.; Guenoun, P. & Perrin, P., Breaking of the Bancroft rule for multiple emulsions stabilized by a single stimulable polymer, SOFT MATTER, (2014), 10, 7073-7087 where first successful trials of neutron reflectivity at liquid-liquid interface are depicted.
Recent advances are about the making of biocompatible polymers for performing a similar job and about how salt addition is able to control where multiple emulsions form.

emulsion multiple




Biomimetic crystal growth : how to grow calcium carbonate which resembles to the one found in natural Nacre ?


ANR project Ptyccobio with I. Fresnel (Marseille), V. Chamard coordinator
See details

nacre

 
Block copolymers organized on a substrate to form adapted 2D or 3D nanostructures

How to simply organize nanoscale structures on surfaces ? Block copolymers offer such a possibility when they are phase separated (the so-called microphase separation). For instance lamellae or cylinders with a nanometric lengthscale can be oriented perpendicular to a substrate (Easy Orientation of Diblock Copolymers on Self-Assembled Monolayers Using UV Irradiation, Liu PH, Thebault P, Guenoun P, et al., MACROMOLECULES   Volume: 42   Issue: 24   Pages: 9609-9612   (2009) http://dx.doi.org/10.1021/ma9021357) by a simple surface energy control.

perpendicular lamellae

When constraints are provided by a mold which is nanoimprinted on the film, in-plane organization of the lamellae is favored as shown by experiment and calculations (collaboration with Tel-Aviv University, David Andelman) in an, X. K.; Andelman, D.; Orland, H.; Thebault, P.; Liu, P. H.; Guenoun, P.; Daillant, J.; Landis, S., Organization of Block Copolymers using NanoImprint Lithography: Comparison of Theory and Experiments. Macromolecules 2011, 44 (7), 2206-2211.
A perfect long-distance arrangement can be obtained by nanoimprinting in conditions where the polymer thin film undergoes nanoflows (
Thebault, P.; Niedermayer, S.; Landis, S.; Chaix, N.; Guenoun, P.; Daillant, J.; Man, X.; Andelman, D. & Orland, H. (2012), 'Tailoring Nanostructures Using Copolymer Nanoimprint Lithography', ADVANCED MATERIALS 24(15), 1952-1955.):



NIL

The next challenge is now to learn how to grow 3D thick ordered structures and possibly transform them into metamaterials (PhD thesis of Florian AUBRIT with CRPP, Bordeaux, V. Ponsinet).


Phase separation of concentrated polymer water solutions: how to make ''green'' membranes without organic solvent ?

By using water-soluble polymers with a miscibility gap, phase-separated structures like interconnected spinodal-like decompositions can be turned in membranes after a cross-linking process and evaporation of solvent ( M'barki, O.; Hanafia, A.; Bouyer, D.; Faur, C.; Sescousse, R.; Delabre, U.; Blot, C.; Guenoun, P.; Deratani, A.; Quemener, D. & Pochat-Bohatier, C., Greener method to prepare porous polymer membranes by combining thermally induced phase separation and crosslinking of poly (vinylalcohol) in water,JOURNAL OF MEMBRANE SCIENCE, (2014), {458}, (225-235).

phase separation (PVA)

 This was the subject of a   ANR CD2I project with IEM (Montpellier) and another ANR project "Gaspom" with IEM Montpellier (D. Bouyer coordinator), Polymem, Total is running to know: how to make polymer membranes filtering and resisting  at high temperatures ?

membrane


Mechanical properties of theranostic core-shell particles at the nanoscale:

Theranostic nanoparticles are in principle able to increase imaging contrast in the body as well as delivering drugs upon stimuli. In this project we measure mechnical properties of core-shell nanoparticles thanks to an Atomic Force Microscope.

principle

Ph. D thesis of B. Sarrazin in collaboration with I. Galien (N. Tsapis), LIPP, Paris (W. Urbach and N. Taulier)


 

Selected recent publications:

 

  Besnard, L.; Protat, M.; Malloggi, F.; Daillant, J.; Cousin, F.; Pantoustier, N.; Guenoun, P. & Perrin, P.
Breaking of the Bancroft rule for multiple emulsions stabilized by a single stimulable polymer
SOFT MATTER, {2014}, {10}, {7073-7087}

  Tseng, Y.-H.; Chevallard, C.; Dauphin, Y. & Guenoun, P.
CaCO3 nanostructured crystals induced by nacreous organic extracts
CRYSTENGCOMM, {2014}, {16}, {561-569}

  M'barki, O.; Hanafia, A.; Bouyer, D.; Faur, C.; Sescousse, R.; Delabre, U.; Blot, C.; Guenoun, P.; Deratani, A.; Quemener, D. & Pochat-Bohatier, C.
Greener method to prepare porous polymer membranes by combining thermally induced phase separation and crosslinking of poly (vinylalcohol) in water
JOURNAL OF MEMBRANE SCIENCE, {2014}, {458}, {225-235}

  Salva, R.; Le Meins, J.-F.; Sandre, O.; Brulet, A.; Schmutz, M.; Guenoun, P. & Lecommandoux, S.
Polymersome Shape Transformation at the Nanoscale
ACS NANO, {2013}, {7}, {9298-9311}

Besnard, L.; Marchal, F.; Paredes, J. F.; Daillant, J.; Pantoustier, N.; Perrin, P. & Guenoun, P. Multiple Emulsions Controlled by Stimuli-Responsive Polymers
ADVANCED MATERIALS, {2013}, {25}, {2844-2848}

Nuss, H.; Chevallard, C.; Guenoun, P. & Malloggi, F. (2012), 'Microfluidic trap-and-release system for lab-on-a-chip-based studies on giant vesicles', LAB ON A CHIP 12(24), 5257-5261.

 Chevalier, N. R.; Chevallard, C.; Goldmann, M.; Brezesinski, G. & Guenoun, P. (2012), 'CaCO3 Mineralization under beta-Sheet Forming Peptide Monolayers', CRYSTAL GROWTH & DESIGN 12(5), 2299-2305.

  Thebault, P.; Niedermayer, S.; Landis, S.; Chaix, N.; Guenoun, P.; Daillant, J.; Man, X.; Andelman, D. & Orland, H. (2012), 'Tailoring Nanostructures Using Copolymer Nanoimprint Lithography', ADVANCED MATERIALS 24(15), 1952-1955.





Publications