研究领域

Solid-state NMR and structure determination of complex materials/including fuel-cell membranes/semicrystalline polymers/carbon materials/nanocomposites/natural organic matter/and thermoelectrics/NMR technique development/basic thermodynamics.

Our group studies the composition and nanoscale structure of polymer materials, nanocomposites, carbon materials, natural organic matter, and thermoelectric tellurides, using a variety of selective or two-dimensional nuclear magnetic resonance (NMR) experiments, many of which were developed by us. We have also introduced new methods for quantitative analysis of scattering data of nanostructured materials. This dual approach has enabled us to “solve” important aspects of the structure of the Nafion fuel-cell membrane and of the nanocomposite in bone. Based on these structural insights, we strive to understand the materials properties and sometimes propose improved synthesis conditions.

近期论文

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"Solid State NMR of Chemical Structure and Hydrothermal Deactivation of Moderate-Temperature Carbon Materials with Acidic SO3H Sites", J. M. Anderson, R. L. Johnson, K. Schmidt-Rohr, B. H. Shanks, Carbon, accepted (2014). "Improved Hydrothermal Stability of Mesoporous Oxides for Aqueous Phase Reactions”, H. N. Pham, A. E. Anderson, R. L. Johnson, K. Schmidt-Rohr, A. K. Datye, Angew. Chemie Int. Ed. 51, 13163-13167 (2012). “Abundant and Stable Char in Soil: Implications for Soil Fertility and Carbon Sequestration”, J-D. Mao, R. L. Johnson, J. Lehmann, D. C. Olk, E. G. Neves, M. L. Thompson, K. Schmidt-Rohr, Environ. Sci. Technol. 46, 9571-6 (2012). "Extent of Pyrolysis Impacts on Fast Pyrolysis Biochar Properties", C. E. Brewer, Y-Y. Hu, K. Schmidt-Rohr, S. D. Joseph, T. E. Loynachan, D. A. Laird, R. C. Brown. J. Environm. Quality 41, 1115-1122 (2011). “Alkyl and Other Major Structures Formed in Model Maillard Reactions Studied by Solid-State NMR”, X-W. Fang, K. Schmidt-Rohr. J. Agric. Food Chem. 59, 481-490 (2011). “Quantitative Solid-State 13C NMR Spectra with Signal Enhancement by Multiple Cross-Polarization”, R. L. Johnson, K. Schmidt-Rohr, J. Magn. Reson. 239, 44-49 (2014). “Spectrally Edited 2D 13C-13C NMR Spectra without Diagonal Ridge for Characterizing 13C-Enriched Low-Temperature Carbon Materials”, R. L. Johnson, J. M. Anderson, B. H. Shanks, X-W. Fang, M. Hong, K. Schmidt-Rohr. J. Magn. Reson., 234, 112-124 (2013). “Spectral Editing of Two-Dimensional Magic-Angle-Spinning Solid-State NMR Spectra for Protein Resonance Assignment and Structure Determination”. K. Schmidt-Rohr, K. J. Fritzsching, T. Wang, S. Y. Liao, M. Hong. J. Biomol. NMR, 54, 343 (2012). “Biomimetic Self-assembling Copolymer¬–Hydroxyapatite Nanocomposites with the Nanocrystal Size Controlled by Citrate”, Y-Y. Hu, X. Liu, X. Ma, J. Yang, A. Rawal, M. Akinc, T. Prozorov, S. Mallapragada, K. Schmidt-Rohr. Chem. Mater. 23, 2481-90 (2011). “Strongly bound citrate stabilizes the apatite nanocrystals in bone” Y.-Y. Hu, A. Rawal, K. Schmidt-Rohr. Proc. Natl. Acad. Sci. USA 107, 22425-22429 (2010). “Nonaromatic Core-Shell Structure of Nanodiamond from Solid–State NMR”, X.-W. Fang, J.-D. Mao, E. M. Levin, K. Schmidt-Rohr. J. Am. Chem. Soc.131, 1426-1435 (2009). “Water–Polymer Interfacial Area in Nafion: Comparison with Structural Models”, X. Kong, K. Schmidt-Rohr, Polymer 52, 1971-1974 (2011). “Parallel Cylindrical Water Nanochannels in Nafion Fuel Cell Membranes”. K. Schmidt-Rohr, Q. Chen, Nat. Mater. 7, 75-83 (2008). “Chemical Analysis of Phase Separation in PbTe – PbS Thermoelectric Materials”, S. N. Girard, K. Schmidt-Rohr, T. C. Hasapis, B. Njegic, E. M. Levin, A. Rawal, K. M. Paraskevopoulos, M. Kanatzidis, Adv. Funct. Mater. 23, 747-757 (2013). “Enhancement of thermopower of TAGS-85 high-performance thermoelectric material via doping with Dy”, E. M. Levin, S. L. Bud’ko, K. Schmidt-Rohr. Adv. Funct. Mater. 22, 2766-2774 (2012). “Chromium as resonant donor impurity in PbTe”, M. D. Nielsen, E. M. Levin, C. M. Jaworski, K. Schmidt-Rohr, J. P. Heremans, Phys. Rev. B 85, 045210 (2012). “Expansion Work without the External Pressure, and Thermodynamics in Terms of Quasistatic Irreversible Processes”, K. Schmidt-Rohr, J. Chem. Educ. 91, 402-409 (2014).