Session D15: Monolayers, Membranes and Microemulsions

2:30 PM–4:54 PM, Monday, March 16, 2009
Room: 316

Sponsoring Unit: DFD
Chair: Erik Luijten, Northwestern University

Abstract ID: BAPS.2009.MAR.D15.7

Abstract: D15.00007 : Breathable NIPAAm Network with Controllable Hydration Supports Model Lipid Membrane

3:42 PM–3:54 PM

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  Michael Jablin
    (Lujan Neutron Scattering Center)

  Hillary Smith
    (Lujan Neutron Scattering Center)

  Mikhail Zhernenkov
    (Lujan Neutron Scattering Center)

  Ajay Vidyasagar
    (University of South Florida)

  Ryan Toomey
    (University of South Florida)

  Jessica Saiz
    (Lujan Neutron Scattering Center)

  Boris Toperverg
    (Ruhr Universitat Bochum)

  Erik Watkins
    (University of California, Davis)

  Tonya Kuhl
    (University of California, Davis)

  Alan Hurd
    (Lujan Neutron Scattering Center)

  Jaroslaw Majewski
    (Lujan Neutron Scattering Center)

The interaction of a model lipid bilayer composed of DPPC with a surface-tethered poly(N-isopropylacrylamide) (NIPAAm) was explored with neutron reflectometry (NR). The Langmuir-Blodgett / Langmuir-Schaeffer method was used to deposit a lipid bilayer onto the polymer. NR measurements were used to probe the in- and out-of-plane structure of the system as a function of temperature. NR with fluorescence microscopy show that the polymer supports a lipid bilayer, and hydration of the support can be controlled. At low temp. the membrane develops out-of-plane undulations visible in off-specular scattering. Analysis of the off-specular reveals in-plane correlation of the bilayer fluctuations. The separation of the lipid bilayer from the solid support of a substrate constitutes a significant step towards a more realistic model of biological membranes.

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