Regensburg 2004 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 15: POSTER: Polymers and Biomaterials
CPP 15.12: Poster
Dienstag, 9. März 2004, 17:00–19:00, B
Water-Soluble Terpolymer Mediated Calcium Carbonate Crystal Modification — •Ranith Krishna Pai1, Sabine Hild1, Othmar Marti1, and Andreas Ziegler2 — 1Experimental Physics, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm — 2Department Electronmicroscopy, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm
The structure of the polymeric substrates plays an important role in the nucleation of calcium carbonate crystals. In this study a synthetic water-soluble poly (acrylamide-co-2-acrylamido-2-methyl-1-propane sodium sulfonate-co-n-vinyl pyrrolidone) will be introduced which is a substrate favoring the nucleation of polymorphs of calcium carbonate crystals under specific experimental conditions. Morphological characterization of the polymorphs was done using Atomic Force Microscopy, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, FTIR Analysis and X-ray Diffraction. If calcium carbonate was precipitated in presence of the polymer a remarkable increase in nucleation density was observed. Stacked crystals of rhombohedral morphology were formed may be due to the presence of sodium sulfonate groups on the terpolymer. However, in the presence of polymer and poly-L-aspartic acid only hollow crystals of aragonite with needle like or plate like morphologies had been found. This change in calcium carbonate morphology could be explained by the variation of the polymer conformation if poly-L-aspartic acid is present.