Monday, March 27, 2017
Hello all! Welcome to Episode 30 of #MondayMaterials. It’s a little different today as we’re meeting with recent graduate Ella Row to discuss her industrial placement. Ella was introduced to me by former #MondayMaterials participant Patsy Perry. Patsy was particularly excited by this student’s progression because Ella, after a year...
Wednesday, May 24, 2017
Metals and Corrosion Group Seminar Speaker biography: I grew up in a small town in the southern part of Denmark. During my last year at high school I was participating in a project between the school and the local industry. I ended up spending two weeks at a Hydro Aluminium plant where I discovered “the magic universe” of metals. In 2002 I moved to Trondheim and commenced my Masters in Materials Science and Engineering. I finished my Masters degree in spring 2007 and started as a PhD candidate at SIMLab in September 2007. After finishing my PhD I worked at the independent research organization SINTEF Materials and Chemistry from 2011-2014 before I became Associated Professor at Department of Materials Science and Engineering at NTNU. Research interests: My main research area of interest is understanding and modelling of the interplay between thermo-mechanical processing, microstructure and mechanical properties of metallic materials, mainly steel and aluminium. The scale ranges from nanoscale (precipitates and particles) through micro scale (grain structure) to macro scale (final products/structures). Chemical composition, processing technique and heat treatments affects the microstructure through phase transformation, precipitation of wanted or unwanted particles and texture, which again have a great influence on performance of the end product with respect to strength, ductility, corrosion and fracture behaviour. The materials of interests are primarily, but not limited to, steel and aluminium.
Thursday, May 25, 2017
Dr Steve Walters has investigated the corrosion and performance of AGR fuel since the early 1990s and is now one of the foremost authorities in the UK, being an invited member of the NDA’s AGR Technical Forum, the cross-industry body which supports NDA in underpinning strategy and policy for long term fuel storage, and he also coordinates all the NDA funded PhD projects on spent fuels and nuclear materials in the UK. For the Advanced Metallic System CDT student-run seminar series, we are delighted to announce that Dr Steve Walters C.Chem FRSC MAPM, Research Fellow and Principal Consultant at National Nuclear Labs (http://www.nnl.co.uk/) will be visiting to speak about: Advanced Gas-Cooled Reactor Fuel Storage in the 21st Century! All are invited and coffee and biscuits will be provided
2D electronics: From graphene to transition metal dichalcogenides to layered and tubular group V allotropes
Monday, June 05, 2017
If graphene had a band gap, it would probably be the optimum 2D system for electronics applications. Layered transition metal dichalcogenides (TMDs) with a robust intrinsic band gap appear as the next-best alternative. Only after a long search, however, optimum strategies have been devised to make low-resistance, ohmic contacts to TMDs . In the meantime, a new class of 2D semiconductors has been rapidly gaining attention, namely layered black phosphorus and related phosphorene monolayers . These 2D systems display a tunable, direct fundamental band gap and thus are ideal candidates for optoelectronics applications. Recent Quantum Monte Carlo (QMC) calculations show that the inter-layer bonding, while weak, is not well described by dispersive van der Waals (vdW) interactions . As seen in Fig. 1, QMC results differ qualitatively from vdW-enhanced DFT functionals and the common designation of similar systems as “van der Waals solids” is strictly incorrect. Also other group V systems including monolayers of AsxP1-x , IV-VI compounds such as SiS  with the same average valence, and related 2D phosphorus carbide  share the same nonplanarity of their structure with phosphorene. These systems share another similarity with phosphorene, namely the dependence of the fundamental band gap on the number of layers and in-layer strain. Surprisingly, the story of group V semiconductors does not end with layered 2D systems. A previously unknown 1D structure of coiled phosphorus represents the most stable P allotrope to date. The predicted structure  has recently been synthesized and contained inside carbon nanotubes . In all cases, predictive ab initio calculations provide a useful guidance to experimental studies. * Partly supported by the NSF/AFOSR EFRI 2-DARE grant number #EFMA-1433459. References:  Jie Guan, Hsun-Jen Chuang, Zhixian Zhou, and David Tománek, ACS Nano 11 (2017).  H. Liu et al. ACS Nano 8, 4033 (2014).  L. Shulenburger, A.D. Baczewski, Z. Zhu, J. Guan, and D. Tománek, Nano Lett. 15, 8170 (2015).  Zhen Zhu, Jie Guan, and David Tománek, Nano Lett. 15, 6042 (2015).  Zhen Zhu, Jie Guan, Dan Liu, and David Tománek, ACS Nano 9, 8284 (2015).  Jie Guan, Dan Liu, Zhen Zhu, and David Tománek, Nano Lett. 16, 3247 (2016).  Dan Liu, Jie Guan, Jingwei Jiang, and David Tománek, Nano Lett. 16, 7865 (2016).  Jinying Zhang et al. Angew. Chem. Int. Ed. 56, 1850-1854 (2017) Biography Professor David Tomanek studied Physics in Switzerland and received his Ph.D. from the Free University in Berlin. While holding a position as Assistant Professor of Physics, he pioneered theoretical research in Nanostructures at the AT&T Bell Laboratories and the University of California at Berkeley. He established the field of Computational Nanotechnology at Michigan State University, where he holds a position as Full Professor of Physics. His scientific expertise lies in the development and application of numerical techniques for structural, electronic and optical properties of surfaces, low-dimensional systems and nanostructures.