Scattering Experiments

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Presentation transcript:

Scattering Experiments

Coherence Length Structural coherence length found for small regions from TEM images SAXS: Structural Lcoh average SANS: Structural and Magnetic Lcoh averages

Small Angle X-ray Scattering Bragg’s Law Observe diffraction from planes of particles at small angles Both the lattice symmetry and the shape of diffracting object contribute to the intensity I(q) Ignore scattering by the surfactant coating  the radius R = Rcore

3D Arrays Structures from SAXS x=10.3 nm Shape factor, d=8.5 nm -2 d=8.5 nm -4 -6 -8 Shcp(q)P(q) Both hcp and fcc arrays observed Shcp(q)P(q)

3D Arrays Made Over 4 Weeks Interparticle spacing slightly reduced x=9.6 nm d=8.5 nm Average intensity Sharpest peak Spots due to 3 hcp supercrystals- Large Lcoh

Nanoparticle Crystals vs Disordered Assemblies SAXS patterns of 8.5 nm Fe nanoparticle FCC nanoparticle crystals and rapidly quenched assemblies

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