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  • BaCO3 mesocrystals: new morphologies using peptide-polymer conjugates as crystallization modifiers.

BaCO3 mesocrystals: new morphologies using peptide-polymer conjugates as crystallization modifiers.

Physical chemistry chemical physics : PCCP (2010-09-08)
Tongxin Wang, James Mitchell, Hans Börner, Helmut Cölfen, Markus Antonietti
ABSTRACT

Nanocrystal superstructures of barium carbonate (BaCO(3)) which exhibit unusual morphologies are obtained by the carbon dioxide vapor diffusion technique in the presence of poly(ethylene oxide)-block-eicosa aspartate (PEO-b-Asp(20)). The highly effective bioconjugate acts as a crystal growth modifier over a broad range of concentrations. Instead of commonly observed branched needles, the morphology can be systematically varied along different twinned growth patterns towards well-defined branched dumbbells. Detailed analysis of the crystal substructures with high resolution scanning electron microscopy (HRSEM) and dynamic light scattering (DLS) discloses a potential growth mechanism of the superstructures and reveals the role of the polymeric bioconjugate therein.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Barium carbonate, 99.999% trace metals basis
Sigma-Aldrich
Barium carbonate, ACS reagent, ≥99%
Sigma-Aldrich
Barium carbonate, 99.98% trace metals basis