Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental determination of the entropic potential between supported
  fluctuating lipid bilayers   The interaction potential between supported floating bilayers has been
determined by grazing incidence specular and off-specular scattering using
synchrotron radiation. Our measurements demonstrate that floating bilayers are
significantly more hydrated than the usually studied multilayers, therefore
giving access to more intrinsic properties of the membranes. At equilibrium,
the interaction potential can be two orders of magnitude softer than previously
reported, which can be explained by the weak electrostatic interaction due to
the small fraction (sigma ~ 0.001 e$^-$/nm$^2$) of ionized lipids in the
bilayers. Our data are sensitive enough to discriminate between different
functional forms of the entropic repulsion proposed in the literature, and the
"soft" potential of R. Podgornik and V. Parsegian, Langmuir 8, 557 (1992) is
shown to most appropriately describe our data.

3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th