时间：2015年5月28日（星期四）上午9：00
地点：材料科学与工程学院14号楼205学术交流室

报告摘要：
       An overview of recent work on magnetic nanomaterials for energy, biomedical and morphing applications will be presented. (a) Energy: Magnetocaloric materials offer an outstanding opportunity to develop novel, energy efficient, environmentally friendly, greenthermal management systems. The magnetocaloric properties of Fe-Cr-B and Ni-Mn-Sn Heusler alloys will be outlined. (b) Bio: Our development of anti-cancer drug loaded magnet (core)-polymer(shell)nanoparticles (CNP) for multimodal targeted and controlled release for disease treatment will be outlined;our CNPexhibit excellentdrug targeting, hyperthermia and controlled drug release for cancer treatment. (c) Transducers: Morphingwas demonstrated in magnet-polymer composites; actuation modes and sensing characteristics will be sketched. The remainder of the talk will focus on the development of novel soft magnetic nanomaterials.Soft magnetic nanomaterials have been intensively studied following the commercial success of Fe-Si-B-Cu-Nb (Finemet) alloys; the microstructure consists of a high density of soft magnetic nanoprecipitates in an amorphous matrix.  We investigated, in a variety of iron and cobalt based soft magnetic alloys, the nucleation and growth mechanisms involved in the formation of these nanopreciptates. In Finemet alloys, the alloying elements copper and niobium are essential to nanoprecipitate formation.  Nanoprecipitation of Fe-Si-B-Cu-Nb alloys were compared to the counterpart Fe-Si-B, Fe-Si-B-Cu and Fe-Si-B-Nb alloys. Synergistic composition changes of Cu and Nb at the precipitate: matrix interface and the role of Nb in restricting precipitate growth were found to play a key role in determining the crystal morphology, crystal size and nucleation density. These results and the concomitant change in magnetic properties will be discussed. 

附报告人简介：
       Prof. R. V. Ramanujan, Fellow, American Society for Materials, is at the School of Materials Science and Engineering, NTU.  He earned his undergraduate and Ph.D. degrees from IIT-Bombay and Carnegie Mellon University (USA), respectively.  He is Chair of the Magnetic Materials Committee of TMS (USA) and serves on the IEEE Technical Committee (USA), Phase Transformations Committee of TMS (USA) and Awards Committee of TMS (USA). Ramanujan serves as Editor/Editorial Board member of Metallurgical and Materials Transactions, Materials Science and Engineering B, Materials Science and Engineering C and Nanomedicine. He has received the Nanyang Award for Excellence in Teaching. He is a Visiting Professor at the University of North Texas, South China University of Technology, and the Center for Advanced Scientific Research (India).