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Nuclear Magnetic Resonance (NMR) Spectroscopy Facility

Introduction

The Sandia National Laboratories NMR Spectroscopy Facility maintains both high resolution solution and solid state capabilities for the characterization of chemical structure, reaction kinetics, morphologies and dynamic properties for a wide range of materials. Our research includes the development and implementation of both multi-frequency and multi-dimensional NMR experiments to probe specific chemical or materials science related questions.

Research Interests

Graphene/Liquid Crystal Materials

NMR provides the perfect tool to measure the properties of graphene related materials. Our efforts include the development of HRMAS NMR diffusometry in nanoporous carbons and 2H NMR studies of orientational order in LC composites.

Liquid Crystal - NMR Figure

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Structure and Dynamics in Polymers and Composites

Precise manipulation of structure within ionomer and fuel call membranes continues to be an area of interest. In collaboration with University of Pennsylvania a series of poly(ethylene-co-acrylic acid) copolymers P(E-AA) have been prepared to address the role of carboxylic acid spacing.Utilizing samples with precise versus random placement of the pendant carboxylic acid group, the effect on structure, morphology, and dynamics is being investigated. Solid state 1H and 13C MAS NMR spectroscopy is being used to characterize these changes. The NMR reveals that the changes in the P(E-AA) structure and dynamics imposed by these carboxylic acid defects are distinct, and vary with temperature and the degree of Zn2+, Li+ or Na+ neutralization. These results are being combined with ab initio calculations of NMR shielding parameters to understand the experimental results.

C. Francisco Buitrago, Janelle E. Jenkins, Kathleen L. Opper, Brian S. Aitken, Kenneth B. Wagener, Todd M. Alam, and Karen I. Winey, “Room Temperature Morphologies of Precise Acid- and Ion-Containing Polyethylenes”, Macromolecules, ASAP (2013). http:/dx/doi.org/10.1021/ma4013169

C. Francisco Buitrago, Todd M. Alam, Kathleen L. Opper, Brian S. Aitken, Kenneth B. Wagener, and Karen I. Winey, “Morphological Trends in Precise Acid- and Ion-Containing Polyethylenes at Elevated Temperature”, Macromolecules, ASAP (2013). http:/dx/doi.org/10.1021/ma4013175

Todd M. Alam, Janelle E. Jenkins, Dan S. Bolinitineanu, Mark J. Stevens, Amalie L. Frischknecht, C. Francisco Buitrago, Karen I. Winey, Kathleen L. Opper and Kenneth B. Wagener, “Heterogeneous Coordination Environments in Lithium-Neutralized Ionomers Identified Using 1H and 7Li MAS NMR”, Materials,  5, 1508-1527 (2012). http://www.mdpi.com/1996-1944/5/8/1508___________________________________________________________


Structure and Dynamics in Inorganic Systems

Both solution and solid-state NMR has been use to look at a range of inorganic materials. Recently we have employed solid state 6,7Li MAS NMR and wide line 139La NMR to probe the impact of processing on Li-La-Nb/Ta Garnet electrolytes and lanthanum halides. High speed 1H MAS NMR has also been employed to look at the role of templating in ruthenium oxide electrodes. The dynamics in Uranyl Nanocapsules utilizing23Na solution and solid state has also been descriped in JACS:

JACS_Thumnail

May Nyman and Todd M. Alam, “Dynamics of Uranyl Peroxide Nanocapsules”, J. Am. Chem. Soc., 134, 20131-20138 (2012). http://dx.doi.org/10.1021/ja308673f

Todd M. Alam, Zuolei Liao, Lev N. Zacharov, May Nyman, “Solid-State Dynamics of Uranyl Polyoxometalates”, Chemistry, A. Eur. J., 20(27), 8302-8307 (2014).   http://dx.doi.org/10.1002/chem.201402351

Todd M. Alam, Zuolei Liao, May Nyman and Jonathan Yates, “Insight into Hydrogen Bonding of Uranyl Hydroxide Layers and Capsules by Use of 1H Magic-Angle Spinning NMR Spectroscopy”, J. Phys. Chem. C, 120(19), 10675-10685 (2016) DOI: 10.1021/acs.jpcc.6b02692

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For more information, contact Todd M. Alam

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NMR Facility Director - CV




Contact
Todd M. Alam
(tmalam@sandia.gov)
(505)844-1225


Related Links

Arizona State University Chemistry Department

ASU Magnetic Resonance Reseach Center

The University of New Mexico

New Mexico Resonance

NMR2

last update: March 24,2011
content owner: Todd M. Alam
page author: Sarah McIntyre