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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

2011
Hu Y Y; Liu X P; Ma X; Rawal A; Prozorov T; Akinc M; Mallapragada S K; Schmidt-Rohr K . 2011. Biomimetic Self-Assembling Copolymer-Hydroxyapatite Nanocomposites with the Nanocrystal Size Controlled by Citrate. Chemistry of Materials. 23:2481-2490. abstract
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Kong X Q; Schmidt-Rohr K . 2011. Water-polymer interfacial area in Nafion: Comparison with structural models. Polymer. 52:1971-1974. abstract
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Levin E M; Cook B A; Harringa J L; Bud'ko S L; Venkatasubramanian R; Schmidt-Rohr K . 2011. Analysis of Ce- and Yb-Doped TAGS-85 Materials with Enhanced Thermoelectric Figure of Merit. Advanced Functional Materials. 21:441-447. abstract
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Dick-Perez M; Zhang Y A; Hayes J; Salazar A; Zabotina O A; Hong M . 2011. Structure and Interactions of Plant Cell-Wall Polysaccharides by Two- and Three-Dimensional Magic-Angle-Spinning Solid-State NMR. Biochemistry. 50:989-1000. abstract
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2010
Hu Y Y; Rawal A; Schmidt-Rohr K . 2010. Strongly bound citrate stabilizes the apatite nanocrystals in bone. Proceedings of the National Academy of Sciences of the United States of America. 107:22425-22429. abstract
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2009
Jaworski C M; Tobola J; Levin E M; Schmidt-Rohr K; Heremans J P . 2009. Antimony as an amphoteric dopant in lead telluride. Physical Review B. 80:125208. abstract
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Levin E M; Cook B A; Ahn K; Kanatzidis M G; Schmidt-Rohr K . 2009. Electronic inhomogeneity and Ag:Sb imbalance of Ag1-yPb18Sb1+zTe20 high-performance thermoelectrics elucidated by Te-125 and Pb-207 NMR. Physical Review B. 80:115211. abstract
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Hu Y Y; Yusufoglu Y; Kanapathipillai M; Yang C Y; Wu Y Q; Thiyagarajan P; Deming T; Akinc M; Schmidt-Rohr K; Mallapragada S . 2009. Self-assembled calcium phosphate nanocomposites using block copolypeptide templates. Soft Matter. 5:4311-4320. abstract
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Hu Y Y; Levin E M; Schmidt-Rohr K . 2009. Broadband "Infinite-Speed" Magic-Angle Spinning NMR Spectroscopy. Journal of the American Chemical Society. 131:8390-+. abstract
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Hu Y Y; Schmidt-Rohr K . 2009. Effects of L-spin longitudinal quadrupolar relaxation in S{L} heteronuclear recoupling and S-spin magic-angle spinning NMR. Journal of Magnetic Resonance. 197:193-207. abstract
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