Liaqat Faroha, Tahir Muhammad Nawaz, Schechtel Eugen, Kappl Michael, Auernhammer Günter K, Char Kookheon, Zentel Rudolf, Butt Hans-Jürgen, Tremel Wolfgang
Institute for Inorganic and Analytical Chemistry, Johannes Gutenberg-University, Duesbergweg 10-14, 55099, Mainz, Germany.
Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Macromol Rapid Commun. 2015 Jun;36(11):1129-37. doi: 10.1002/marc.201400706. Epub 2015 Apr 30.
Many natural materials are complex composites whose mechanical properties are often outstanding considering the weak constituents from which they are assembled. Nacre, made of inorganic (CaCO3 ) and organic constituents, is a textbook example because of its strength and toughness, which are related to its hierarchical structure and its well-defined organic-inorganic interface. Emulating the construction principles of nacre using simple inorganic materials and polymers is essential for understanding how chemical composition and structure determine biomaterial functions. A hard multilayered nanocomposite is assembled based on alternating layers of TiO2 nanoparticles and a 3-hydroxy-tyramine (DOPA) substituted polymer (DOPA-polymer), strongly cemented together by chelation through infiltration of the polymer into the TiO2 mesocrystal. With a Young's modulus of 17.5 ± 2.5 GPa and a hardness of 1.1 ± 0.3 GPa the resulting material exhibits high resistance against elastic as well as plastic deformation. A key feature leading to the high strength is the strong adhesion of the DOPA-polymer to the TiO2 nanoparticles.
许多天然材料是复杂的复合材料，考虑到构成它们的成分较为脆弱，其机械性能往往十分出色。由无机（碳酸钙）和有机成分组成的珍珠母就是一个典型例子，因其强度和韧性与它的层级结构以及明确的有机-无机界面有关。利用简单的无机材料和聚合物来模仿珍珠母的构建原理，对于理解化学成分和结构如何决定生物材料的功能至关重要。一种坚硬的多层纳米复合材料是基于二氧化钛纳米颗粒层和3-羟基酪胺（多巴）取代的聚合物（多巴聚合物）交替排列组装而成的，通过聚合物渗透到二氧化钛介晶中进行螯合，从而将它们牢固地粘结在一起。所得材料的杨氏模量为17.5±2.5吉帕，硬度为1.1±0.3吉帕，对弹性和塑性变形均表现出高抗性。导致高强度的一个关键特征是多巴聚合物与二氧化钛纳米颗粒之间的强附着力。
