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Small-Angle Neutron Scattering - Kfki

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Separation of nuclear and<br />

magnetic neutron scattering<br />

D-cyclohexane + Fe 3<br />

O 4<br />

/ OA (ϕ m ~ 1%)<br />

D-cyclohexane + Fe 3<br />

O 4<br />

/ MA (ϕ m ~ 1%)<br />

Mitglied in der Helmholtz-Gemeinschaft<br />

I(q), cm -1<br />

10<br />

1<br />

0.1<br />

fit by model “non-interacting<br />

polydisperse core-shell particles”<br />

F 2 N<br />

F 2 M<br />

Guinier<br />

approximations<br />

R g<br />

=8.0 nm<br />

R g<br />

=5.3 nm<br />

0.1 1<br />

q, nm -1<br />

I(q), cm -1<br />

10<br />

1<br />

0.1<br />

0.01<br />

1E-3<br />

R g<br />

=3.7 nm<br />

0.1 1<br />

q, nm -1<br />

R g<br />

=4 nm<br />

In contrast to correlation in particle locations, correlation in orientation of particle<br />

magnetic moments because of dipole-dipole interaction keeps its influence at small<br />

particle concentrations<br />

F 2 N<br />

F 2 M

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