Formation of Unusual 10-Petal BaSO 4 Structures in the Presence of a Polymeric Additive
2002; American Chemical Society; Volume: 2; Issue: 3 Linguagem: Inglês
10.1021/cg025507v
ISSN1528-7505
AutoresHelmut Cölfen, Limin Qi, Yitzhak Mastai, Lars Börger,
Tópico(s)Machine Learning in Materials Science
ResumoIn this work, the formation of unusual flowerlike structures with 10-petals composed of BaSO4 single crystalline platelets is described. The structures are obtained at pH 5 in an aqueous solution in the presence of a double hydrophilic block copolymer poly(ethylene oxide)-block-sulfonated poly(ethylene imine) (PEO-b-PEI-SO3H) by site-specific polymer adsorption. The exposed faces are identified, the atomar surface structures of these faces are calculated, and preferred faces for polymer adsorption are found. A model for the growth of the unusual 10-petal BaSO4 structures is presented which is based on the nucleation of primary particles, secondary growth of the petals, and finally layer wise petal overgrowth.
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