Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster: Crystallisation, Nucleation and Self assembly

CPP 17.15: Poster

Tuesday, March 27, 2012, 18:15–20:15, Poster A

Opal-like Crystals: Structural Analysis by Small Angle Neutron Scattering — •Parvin Sharifi Rajabi, Mulda Muldarisnur, and Frank Marlow — Max-Planck-Institut für Kohlenforschung, Mülheim (Ruhr), Germany

Spherical building blocks ordered in a close-packed fcc arrangement form opal-like structures. They are interesting photonic crystals. Self-assembly is a direct and cheap approach for the opal fabrication but mostly, it results in structures with many defects. The photonic properties of these structures are highly sensitive to the structural imperfection. Characterization by different diffraction approaches can resolve the details of the structure.

Opals and inverse opals were fabricated by capillary deposition method [1]. They were characterized optically, by SEM and mostly by SANS. The SANS data were analyzed in respect to structural imperfections and lattice deformations. The preliminary interpretation was significantly extended [2].

[1] H. L. Li, W. Dong, H. J. Bongard, F. Marlow, J. Phys. Chem. B 2005, 109, 9939.

[2] F. Marlow, M. Muldarisnur, P. Sharifi, H. Zabel, Phys. Rev. B 2011, 84, 073401.