报告题目：Bio-Inspired Organic-Inorganic Hybrid Materials

　　报 告 人：Prof. Helmut C?lfen

　　工作单位：University of Konstanz

　　报告时间：2015年10月8日（星期四）9:30-10:30

　　报告地点：行政楼205报告厅

　　报告人简介：

　　Helmut C?lfen教授于1991年、1993年分获德国杜伊斯堡大学物理化学专业学士、博士学位；1993-1995年，英国诺丁汉大学，博士后；1995-2001年，德国马克斯普朗克研究所，副教授；1995-2010年，德国马克斯普朗克胶体与界面研究所研究组组长、资深研究员；2010年至今，任德国康斯坦茨大学化学系全职教授；2014年入选中国科学院外国专家特聘研究员计划。C?lfen教授是生物矿化领域的国际著名科学家，主要致力于研究材料的成核、结晶与性能的关系，在原子尺度上通过合理的自组装形成纳米结构，研究其在太阳能电池、催化剂、超级电容器、力学材料等领域的应用，并取得了许多令人瞩目的成绩。已在Science, Nature Materials, Nature Chemistry, Nature Communications, PNAS, Angew. Chem.Int. Ed., J. Am. Chem. Soc., Adv. Mater., Nano letters, ACS Nano, Physical Review Letters等国际高水平杂志上发表论文230余篇，SCI引用超过12,000多次，H index=56。他还致力于纳米科学与纳米技术的产业化，获得了多项具有影响力的荣誉，曾入选汤姆孙路透“Top 100 chemists worldwide for the years 2000-2010”和世界排名机构Times High Education“Top Chemists of the past Decade”。Helmut C?lfen教授被多个国际会议邀请做大会或邀请报告。曾获得“Dr. Hermann Schnell Award”, “Academy Award of the Berlin Brandenburg Academy of Sciences and Humanities”和“ECIS Solvay Award of the European Colloid and Interface Society”等。

　　报告摘要：

　　Biominerals teach excellent lessons about advanced materials design. Their structural design is optimized for the specific materials purpose and often, the beneficial properties are generated on several hierarchy levels. Consequently, Biominerals are an intense subject of research to reveal the design principles. This led to the discovery of amorphous or even liquid precursors to single crystals in Biomineralization and additive controlled crystallization events. Non classical particle mediated crystallization pathways were found to be important besides the classical crystallization path.

　　This presentation begins with self-assembled hierarchical layered materials from anisotropic nanoparticles aligned by modified self-assembling polyoxazoline polymers with mesogens forming liquid crystals as driving force towards crystallization. Furthermore, an attempt towards combination of several advantageous biomineral properties, namely the fracture resistance of Nacre, the wear resistance of chiton teeth and the magnetic properties of magnetotactic bacteria will be reported. The third example is bio-inspired elastic cement synthesized via a non-classical crystallization pathway. Calcium-silicate-hydrate (C-S-H) nanoparticles, the glue in concrete, are stabilized by copolymers with anionic groups and moieties able to form hydrogen bonds. These polymers bind to C-S-H nanoparticles at pH 12 and stabilize them. Further pH increase leads to destabilization and subsequent nanoparticle aggregation in crystallographic register forming a mesocrystal with a similar structure to a sea urchin spine. This mesocrystal is elastic and can be bent without breaking. This is a further demonstration that bio-inspired synthesis and structuration of organic-inorganic hybrid materials can lead to significant materials improvement – even for the most used synthetic material.