An Introduction to Neutron Scattering - Spallation Neutron Source
An Introduction to Neutron Scattering - Spallation Neutron Source
An Introduction to Neutron Scattering - Spallation Neutron Source
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Vesicles composed of DMPC molecules fuse creating almost a perfect<br />
lipid bilayer when deposited on the pure, uncoated quartz block*<br />
(blue curves)<br />
When PEI polymer was added only after quartz was covered by the lipid<br />
bilayer, the PEI appeared <strong>to</strong> diffuse under the bilayer (red curves)<br />
4<br />
Reflectivity, R*Q z<br />
10 -8<br />
10 -9<br />
<strong>Neutron</strong> Reflectivities<br />
Lipid Bilayer on Quartz<br />
Lipid Bilayer on Polymer<br />
on Quartz<br />
0.00 0.02 0.04 0.06 0.08 0.10 0.12<br />
Q z [Å -1 ]<br />
* Data courtesy of G. Smith (LANSCE)<br />
<strong>Scattering</strong> Length Density [Å -2 ]<br />
2 10 -6<br />
0<br />
-2 10 -6<br />
-4 10 -6<br />
-6 10 -6<br />
-8 10 -6<br />
2 O<br />
D 2 O<br />
<strong>Scattering</strong> Length Density<br />
Profiles<br />
Head<br />
σ = 5.9 Å<br />
Hydrogenated<br />
Tails<br />
Head<br />
Length, z [Å]<br />
Polymer<br />
σ = 4.3 Å<br />
Quartz<br />
Quartz<br />
0.0 20.0 40.0 60.0 80.0 100.0
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