Solid-State NMR of Complex Materials

Personnel

Project Leader(s):
Klaus Schmidt-Rohr

Principal Investigators:
Mei Hong, Evgenii Levin, Klaus Schmidt-Rohr

Postdoctoral Research Associates:
Bosiljka Njegic, Aditya Rawal

Overview

This project develops and applies advanced solid-state nuclear magnetic resonance (NMR) techniques to elucidate the structure and dynamics of complex organic, nanocomposite, and semiconductor materials. Systems of particular interest include bioinspired nanocomposites (in collaboration with the Project on Bioinspired Materials), nanostructured polymer-based fuel-cell membranes, and complex tellurides for photovoltaics, data storage, and thermoelectrics (in collaboration with Bruce Cook, Ames Laboratory).

We study nanocomposites of Nafion with modified side groups and with silica or zirconium phosphate nanoparticles grown in situ, developed to improve fuel-cell operation at higher temperatures. This extends our investigations to the biological nanocomposites in enamel and biosilicas.

Highlights

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Publications

2013
Levin E M; Hanus R; Hanson M; Straszheim W E; Schmidt-Rohr K . 2013. Thermoelectric properties of Ag2Sb2Ge46-xDyxTe50 alloys with high power factor. Physica Status Solidi A-Applications and Materials Science. 210:2628-2637. abstract
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Wang T; Park Y B; Caporini M A; Rosay M; Zhong L H; Cosgrove D J; Hong M . 2013. Sensitivity-enhanced solid-state NMR detection of expansin's target in plant cell walls. Proceedings of the National Academy of Sciences of the United States of America. 110:16444-16449. abstract
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Njegic B; Levin E M; Schmidt-Rohr K . 2013. Te-125 NMR chemical-shift trends in PbTe-GeTe and PbTe-SnTe alloys. Solid State Nuclear Magnetic Resonance. 55-56:79-83. abstract
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Levin E M; Heremans J P; Kanatzidis M G; Schmidt-Rohr K . 2013. Electronic inhomogeneity in n- and p-type PbTe detected by Te-125 NMR. Physical Review B. 88:115211. abstract
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Levin E M; Besser M F; Hanus R . 2013. Electronic and thermal transport in GeTe: A versatile base for thermoelectric materials. Journal of Applied Physics. 114:083713. abstract
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Levin E M . 2013. Magnetic phase transitions and electrical switching in Gd-5(Sn0.3Ge3.7) induced by magnetic field. Journal of Magnetism and Magnetic Materials. 340:113-119. abstract
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Nlebedim I C; Levin E M; Prozorov R; Dennis K W; McCallum R W; Jiles D C . 2013. Magnetic and Thermoelectric Properties of Cobalt Ferrite. IEEE Transactions on Magnetics. 49:4269-4272. abstract
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Liu X P; Ge Q W; Rawal A; Parada G; Schmidt-Rohr K; Akinc M; Mallapragada S K . 2013. Templated and Bioinspired Aqueous Phase Synthesis and Characterization of Mesoporous Zirconia. Science of Advanced Materials. 5:354-365. abstract
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Girard S N; Schmidt-Rohr K; Chasapis T C; Hatzikraniotis E; Njegic B; Levin E M; Rawal A; Paraskevopoulos K M; Kanatzidis M G . 2013. Analysis of Phase Separation in High Performance PbTePbS Thermoelectric Materials. Advanced Functional Materials. 23:747-757. abstract
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2012
Wang T; Zabotina O; Hong M . 2012. Pectin-Cellulose Interactions in the Arabidopsis Primary Cell Wall from Two-Dimensional Magic-Angle-Spinning Solid-State Nuclear Magnetic Resonance. Biochemistry. 51:9846-9856. abstract
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