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Mesostructured organic-inorganic hybrid materials
发布时间: 2017-05-15
浏览次数: 10


报告人:Helmut Cölfen教授,Physical Chemistry, University of Konstanz
报告题目:Mesostructured organic-inorganic hybrid materials
时间:2017年5月17日(周三) 15:00 ~ 17:00
地点:材料学院 新楼308
邀请人:姜源 副教授

报告人简介:Helmut Cölfen教授是国际著名材料学专家,主要研究方向为仿生矿化、无机-高分子复合材料设计、溶液相材料合成动力学、胶体材料分析、高分子合成等。截止到2016年八月,在相关领域发表300余篇论文,H-Index为64, 引用超过17200次,参加国际会议做邀请报告及大会报告超过200次。现为晶体专业杂志Crystals总编。

摘要:Mesostructured organic-inorganic hybrid materials are a very versatile class of materials. Partly, they are inspired by Biominerals, which have outstanding materials properties due to the  precise organization of inorganic matter by organic template structures. In this presentation, three examples of mesostructured organic-inorganic hybrid materials will be discussed:
1. Mimicking bone technology for implant coating;
Mimicking bone technology uses the covalent binding of a thin gelatin layer to the surface of a polyetheretherketone or titania implant. Subsequent mineralization with calcium phosphate leads to a surface which mimicks natural bone. Cell tests with osteoblasts show that the cells like this surface coating a lot and already start to secrete collagen as the first precursor for bone within only 12h.
2. Mineral Plastics;
Mineral Plastics are an exiting new class of plastics. They are made from polyacrylic acid and CaCO3 nanoparticles by simple mixing of polyacrylic acid with calcium and carbonate ions in water until a hydrogel is precipitated. They have several remarkable properties like self-healing, free shapeability and a very high adhesion strength strongrer than DOPA based mussel glue. When dried, a transparent film is obtained which is much harder and has a higher elastic modulus than Polymethylmethacrylate or shrimp shells and is non-flammable. The film can be reversably swollen to obtain the hydrogel again and vice versa
3. Magnetite Mesocrystals
Magnetite nanocubes can be assembled to mesocrystals with a very high precision. The high order of these structures will be demonstrated. Also it will be shown that these self assembled superstructures can be reversibly formed and dissolved. Also, they appear to form several polymorphs of their superstructure. In addition, their formation shows striking similarities with crystallization features of molecular crystals. This suggests such mesocrystals as a nice model system to better understand crystallization.

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