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lecture5
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lecture5
3.Small Angle Neutron Scattering
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ILL
ILL, Grenoble/FR the most advanced
Neutron Scattering facility in the world.
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ILL Guide Hall
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ILL Reactor
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ILL Experimental Hall
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SANS at ILL Beamline D22
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SANS at IFF - Jülich / GE
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NEUTRON Sources
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NEUTRON Sources
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Scattering lengths and Cross section
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H2O vs. D2O
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SANS Contrast Matching
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Scattering from a Gaussian coil polymer in
solution
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Scattering from a uniform sphere
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Scattering from cylindrical shapes
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Real SANS data
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Nucleation and growth studied by time-resolved
SANS
S.U. Egelhaaf (ILL), P. Schurtenberger (ETH
Zürich), J. Morris, U. Olsson, H. Wennerström
(Lund University)
Figure 1 Oligodisperse oil-in-water
microemulsion droplets are quenched into a two
phase area. At final equilibrium, smaller
droplets coexist with an excess oil phase that
nucleates at a few of the initial droplets which
subsequently grow (t gt 0), allowing the majority
of droplets to decrease in size. This growth
phase proceeds with a constant number of large
drops (t gtgt 0).
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Nucleation and growth studied by time-resolved
SANS
S.U. Egelhaaf (ILL), P. Schurtenberger (ETH
Zürich), J. Morris, U. Olsson, H. Wennerström
(Lund University)
Figure 2 Sequence of scattering curves from a
time-resolved small-angle neutron-scattering
experiment recorded during the nucleation and
growth of an excess oil phase from oil-in-water
microemulsion droplets. For clarity only every
second measurement is shown. As an example the
scattering curve obtained at t 3150 s is added
as an inset.
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Nucleation and growth studied by time-resolved
SANS
S.U. Egelhaaf (ILL), P. Schurtenberger (ETH
Zürich), J. Morris, U. Olsson, H. Wennerström
(Lund University)
Figure 3 Time-dependence of the radius of
gyration Rg,big as obtained from a Guinier fit.
Also shown is the power law behaviour expected
for a classical Ostwald ripening process.
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