报告内容摘要：

Hydroxyapatite (HA) is the most important bioceramics for orthopedic and dental applications because its composition is similar to that of bone minerals. The ability of inducing hydroxyapatite formation physiological conditions has been considered a gold standard for bioactivity of orthopedic and dental implants. However, the several fundamental questions about hydroxyapatite or apatite formation have never been crystal-clear for many researchers. Using TEM as the main research tool, Prof. Leng’s group at HKUST has found that another calcium phosphate phase, octacalcium phosphate (OCP), has often mistakenly identified as HA in the formation products in physiological environments, because the difficulties to see the difference between their diffraction patterns. Further investigations have revealed that OCP is widely formed in simulated and real physiological conditions, even in bone minerals. Another controversial issue is the carbonated hydroxyapatite (CHA), which has been considered even more bioactive than hydroxyapatite. Identifying it from hydroxyapatite was a challenge. The group has successfully determined the characteristic FTIR peaks of the A and B type of CHA, using carefully designed experiments and computational simulations. 

报告人简介：

Dr. Yang Leng is the professor emeritus at The Hong Kong University of Science and Technology (HKUST).   He graduated from Chongqing University in China with BS degree of Metallurgical engineering. He obtained MS degree of Metallurgical engineering at Michigan Technological University and PhD degree of Materials Science at The University of Virginia in US.  He joined the Department of Mechanical engineering at HKUST as a faculty member in 1992. His research interests covered materials processing, mechanical behavior and materials characterization. Since 1997, he has focused on biomaterials research, mainly on bioceramics and surface modifications for implant materials. His publications on crystallization, crystal structures and phase transformation of calcium phosphates have been widely cited.   He was elected as the Fellow, Biomaterials Science and Engineering of International Union of Societies for Biomaterials Science & Engineering in 2008.  His book, “Materials Characterization, Introduction to microscopic and spectroscopic methods” published by Wiley, is widely used for university teaching in Asia, Europe and USA.  

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