Berlin 2005 – scientific programme
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AKB: Biologische Physik
AKB 100: Poster Session I
AKB 100.30: Poster
Saturday, March 5, 2005, 16:45–18:45, Poster TU D
Dynamics of Complex Crystal Growth in Diblock-Copolymer Solutions — •Antje Reinecke1, Miles Page1, Helmut Cölfen1, and Hans-Günther Döbereiner1,2 — 1Max-Planck-Institute of Colloids and Interfaces, D-14424 Potsdam — 2Departments of Biology and Physics, Columbia University, New York, NY 10027
We characterize CaCO3 crystals grown from Na2CO3 and CaCl2 solutions in a double jet reactor in the presence of Poly(ethyleneoxide)-block-Poly(methacrylic acid). We observe growth via rod, dumbbell and final sphere morphologies using electron and phase-contrast microscopy. It is well known that diblock-copolymer additives influence strongly crystal shapes and structure. However, so far, detailed structural and morphological sequences during crystal growth have not been reported. Extensive phase-contrast microscopy studies are statistically analyzed to provide the dynamics of shape distributions over time. Electron microscopy gives high-resolution images of faceted crystal shapes. X-ray scattering reveals lattice modifications and domain structure. Finally, we correlate crystal morphology to dynamic free ion concentration measurements using Ca++ sensitive electrodes.