报告题目：Polymers and Crystals – A Happy Marriage
报 告 人：Helmut Cölfen教授
In 1995-2010, Helmut Cölfen is a group head in the Max-Planck-Institute of Colloids and Interfaces, and become a full professor for physical chemistry at the university of Konstanz in 2010. His research interests are in the area of nucleation, classical and non-classical crystallization, biomineralization, fractionating methods of colloid and polymer analytics. He has published more than 300 papers, H index of 68, and more than 19900 total citations. He also wrote a book named “Mesocrystals and Non Classical Crystallization”published by John Wiley & Sons. He was listed among the top 100 chemists 2000-2010 by Thomson Reuters. He is a co-editor of Current Nanoscience and editor in chief of Crystals.
Biominerals are remarkable materials with complex and often hierarchical structures and superiour physical properties compared to synthetic materials made at ambient conditions in aqueous environment. Biominerals are organic-inorganic hybrid materials and the crystallization of the inorganic mineral is highly controlled by organic – usually polymeric additives. The formation processes of Biominerals can be mimicked, which is the field of polymer-controlled crystallization or bio-inspired mineralization. Bio-inspired bone implant coatings will be presented, which show a superior osseointegration. Polymers can have different and often multiple roles in a crystallization process. They can be a scaffold for mineral formation, complex ions, inhibit or enhance crystal nucleation, stabilize amorphous precursor phases, selectively adsorb on crystal faces changing their morphology, encode self-organization of nanoparticles and many more. However, polymers can also play a role in crystal dissolution. Examples for polymer-controlled crystal dissolution as well as the various roles of polymers in crystallization processes to generate crystals with complex structures are given. Especially coding of nanoparticles by polymers for their subsequent tailored aggregation is an attractive new research field summarized asNonclassical Crystallization. This crystallization path is based on nanoparticles as building units instead of ions, atoms or molecules and offers new possibilities for the formation of crystals. These possibilities will be discussed too.