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[lecture#5]. [lecture#5]. 3. Small Angle Neutron Scattering. ILL. ILL, Grenoble/FR : the most advanced Neutron Scattering facility in the world. . ILL Guide Hall . ILL Reactor. ILL Experimental Hall. SANS at ILL : Beamline D22. SANS at IFF - Jülich / GE. NEUTRON Sources.

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[lecture#5]

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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SANS at ILL :

Beamline D22






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H2O vs. D2O


















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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 > 0), allowing the majority of droplets to decrease in size. This growth phase proceeds with a constant number of large drops (t >> 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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