Lionel Porcar

Lionel Porcar is a physico-chemist at the NCNR at the National Institute for Standards and Technology in Gaithersburg, MD. He is one of the instrument scientists responsible for the small angle neutron scattering (SANS) spectrometers.

Career History/Education:

• Ph. D in physico-chemistry, University of Montpellier, France (1997)
• Military obligations in 1998
• Post doc, Oak Ridge National Laboratory, Center for Neutron Scattering, TN, 1999-2002

Research Interests:

• Structures and dynamics of complex fluids
• Effect of physical constraint on colloids systems (flat interface and shear flow)
• Rheo-SANS devices
• Membrane phases
• Protein crystallization "in meso"
• Polymer/clay systems

Selected Publications:

• Porcar, L.; Ligoure, C.; Marignan, J. Phys. II Francer 7, 483 (1997) "Layer compression modulus of electrostatically stabilized lyotropic lamellar phases revisited: Application to the quantitative analysis of a polymer induced critical SmA-SmA phase separation".
• Porcar, L.; Delord, P.; Marignan, J. Langmuir 14, 719 (1998) "Inorganic gelation in a lyotropic lamellar phase"
• Porcar, L.; Marignan, J.; Ligoure, C.; Gulik-Krzywicki, T. Langmuir 16, 2581-2594 (2000) "Effect of a non-adsorbing polymer on the stability of a two-solvents lamellar phase: Experimental and theoretical study of a critical point of lamellar/lamellar phase separation"
• Butler, P.D.; Porcar, L.; Hamilton, W.A.; Warr, G.G. Phys. Rev. Lett. 88, 059601 (2001) "Comment on: Evidence of sponge to lamellar phase transition under shear by X-ray scattering experiments in a Couette cell"
• Hamilton, W.A.; Porcar, L.; Butler, P.D.; Warr, G.G. J. Chem. Phys. 116, 8533-8546 (2002) "Local membrane ordering of sponges phase at a solid-solution interface"
• Porcar, L.; Hamilton, W.A.; Butler, P.D.; Warr, G.G. Rev. Sci. Instrum. 73, 2345-2354 (2002) "A new vapor barrier Couette shear cell for small angle neutron scattering measurements"
• Porcar, L.; Hamilton, W.A.; Butler, P.D.; Warr, G.G. Phys. Rev. Lett. 89, 168301 (2002) "Scaling of shear-induced Transformation in membranes phases"
• Porcar, L.; Hamilton, W.A.; Butler, P.D.; Warr, G.G. Langmuir 26, 10779-10794 (2003) "Scaling of structural and rheological response of L-3 sponge phases in the "Sweetened" cetylpyridinium/hexanol/dextrose/brine system"
• Krishnamurthy, V.V.; Bhandar, A. S.; Piao, M.; Zoto, I.; Lane, A.M.; Nikles, D.E.; Wiest, G. J.; Mankey, G.J.; Porcar, L.; Glinka, C.J. Phys. Rev. E 67, 051406 (2003) "Shear and Magnetic Field induced ordering in magnetic nanoparticle dispersions from small angle neutron scattering"
• Malwitz, M.M.; Butler, P.D.; Porcar, L.; Angelette, D.P.; Schmidt, G. Journal of Polymer Science, Part B-Polymer Physics 42, 3102-3112 (2004) "Orientation and relaxation of polymer-clay solutions studied by rheology and small angle neutron scattering"
• Porcar, L.; Hamilton, W.A.; Butler, P.D.; Warr, G.G. Physica B: Condensed Matter 350, E963-E966 (2004) "Relaxation of a shear-induced lamellar phase measured with time resolved small angle neutron scattering"
• Porcar, L.; Hamilton, W.A.; Butler, P.D.; Warr, G.G. Phys. Rev. Lett. (in press) "Topological relaxation of a shear-induced lamellar phase to sponge equilibrium and the energetics of membrane fusion"

Other Interests:

• Soccer, tennis, hiking.

Contact Information:

• Lionel Porcar
  National Institute for Standards and Technology
  100 Bureau Drive, Bldg. 235, STOP 8562
  Gaithersburg MD 20899
• (301)975-5049 (office), (301)921-9847 (fax)
• lionel.porcar@nist.gov

Last modified 15-July-2005