Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster Session
MM 15.20: Poster
Montag, 11. März 2013, 18:00–20:00, Poster E
Understanding the protein-inorganic crystal interaction in bioinspired syntheses — •Annalena Wolff1, Idir Yahiatene1, Walid Hetaba2, Nadine Mill1, Marco Wissbrock3, Stefan Loeffler2, Katrin Eckstädt1, Norbert Sewald3, Peter Schattschneider4, and Andreas Hütten1 — 1Uni Bielefeld, Fakultät für Physik — 2TU Wien, Institut für Festkörperphysik — 3Uni Bielefeld, Fakultät für Chemie — 4TU Wien, Service Center für Elektronenmikroskopie
Bioinspired syntheses have sparked great interest in the past years. Recent studies showed that proteins, involved in nanoparticle formation within natural systems, can be used to influence materials, not known to occur within these systems. The engineering process however remained elusive. Here, cobalt ferrite nanoparticles were synthesized using c25-mms6, a short synthetic version of a protein linked to nanoparticle formation in magnetotactic bacteria. The polypeptide allows the formation of stoichiometric, shape specific nanoparticles, which cannot be achieved under similar conditions by conventional chemical synthesis. The particles were studied at different times during nanoparticle growth using TEM, HRTEM and EELS to gain a better understanding of the engineering process. The polypeptide - inorganic crystal interaction was studied in FCS measurements. The results suggest that the polypeptide adsorbes onto the (111) face of the particles,reduces its surface energy, and allows the formation of hexagonally shaped nanoparticles. The polypeptides can be easily removed after the growth process which is advantageous for applications.