Search Results - "Walder, Brennan J"

The Atomic-Level Structure of Cementitious Calcium Silicate Hydrate by Kumar, Abhishek, Walder, Brennan J, Kunhi Mohamed, Aslam, Hofstetter, Albert, Srinivasan, Bhuvanesh, Rossini, Aaron J, Scrivener, Karen, Emsley, Lyndon, Bowen, Paul

“…Efforts to tune the bulk physical properties of concrete are hindered by a lack of knowledge related to the atomic-level structure and growth of calcium…”
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Atomic-level passivation mechanism of ammonium salts enabling highly efficient perovskite solar cells by Alharbi, Essa A., Alyamani, Ahmed Y., Kubicki, Dominik J., Uhl, Alexander R., Walder, Brennan J., Alanazi, Anwar Q., Luo, Jingshan, Burgos-Caminal, Andrés, Albadri, Abdulrahman, Albrithen, Hamad, Alotaibi, Mohammad Hayal, Moser, Jacques-E., Zakeeruddin, Shaik M., Giordano, Fabrizio, Emsley, Lyndon, Grätzel, Michael

“…The high conversion efficiency has made metal halide perovskite solar cells a real breakthrough in thin film photovoltaic technology in recent years. Here, we…”
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The Atomic-Level Structure of Cementitious Calcium Aluminate Silicate Hydrate by Kunhi Mohamed, Aslam, Moutzouri, Pinelopi, Berruyer, Pierrick, Walder, Brennan J, Siramanont, Jirawan, Harris, Maya, Negroni, Mattia, Galmarini, Sandra C, Parker, Stephen C, Scrivener, Karen L, Emsley, Lyndon, Bowen, Paul

“…Despite use of blended cements containing significant amounts of aluminum for over 30 years, the structural nature of aluminum in the main hydration product,…”
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Quantification of Uncoupled Spin Domains in Spin-Abundant Disordered Solids by Walder, Brennan J, Alam, Todd M

“…Materials often contain minor heterogeneous phases that are difficult to characterize yet nonetheless significantly influence important properties. Here we…”
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Two-dimensional NMR measurement and point dipole model prediction of paramagnetic shift tensors in solids by Walder, Brennan J, Dey, Krishna K, Davis, Michael C, Baltisberger, Jay H, Grandinetti, Philip J

“…A new two-dimensional Nuclear Magnetic Resonance (NMR) experiment to separate and correlate the first-order quadrupolar and chemical/paramagnetic shift…”
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Resolving the Core and the Surface of CdSe Quantum Dots and Nanoplatelets Using Dynamic Nuclear Polarization Enhanced PASS–PIETA NMR Spectroscopy by Piveteau, Laura, Ong, Ta-Chung, Walder, Brennan J, Dirin, Dmitry N, Moscheni, Daniele, Schneider, Barbara, Bär, Janine, Protesescu, Loredana, Masciocchi, Norberto, Guagliardi, Antonietta, Emsley, Lyndon, Copéret, Christophe, Kovalenko, Maksym V

“…Understanding the surface of semiconductor nanocrystals (NCs) prepared using colloidal methods is a long-standing goal of paramount importance for all their…”
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Composites of (C4F)n and (CF)n Synthesized by Uncatalyzed Fluorination of Graphite by Walder, Brennan J., Schorr, Noah B., Brunke, Lyle B., Siegal, Michael P., Alam, Todd M., Fritzsching, Keith J., Lambert, Timothy N.

“…A new solid-state 19F magic-angle spinning NMR signal at an isotropic 19F chemical shift of −53 ppm is measured from graphite fluoride synthesized by reaction…”
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One- and Two-Dimensional High-Resolution NMR from Flat Surfaces by Walder, Brennan J, Berk, Christian, Liao, Wei-Chih, Rossini, Aaron J, Schwarzwälder, Martin, Pradere, Ugo, Hall, Jonathan, Lesage, Anne, Copéret, Christophe, Emsley, Lyndon

“…Determining atomic-level characteristics of molecules on two-dimensional surfaces is one of the fundamental challenges in chemistry. High-resolution nuclear…”
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Iron incorporation in synthetic precipitated calcium silicate hydrates by Siramanont, Jirawan, Walder, Brennan J., Emsley, Lyndon, Bowen, Paul

“…Effect of Fe3+ on the precipitation of synthetic calcium silicate hydrates (C-S-H) under controlled conditions has been evaluated. Using extremely basic either…”
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Modes of Disorder in Poly(carbon monofluoride) by Walder, Brennan J, Alam, Todd M

“…Poly­(carbon monofluoride), or (CF) n , is a layered fluorinated graphite material consisting of nanosized platelets. Here, we present experimental…”
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Weighted AnX multiplets by Walder, Brennan J., Fritzsching, Keith J.

“…[Display omitted] •General expressions for AnX multiplets in INEPT and F1-coupled HSQC experiments.•Weighted AnX multiplets are related to those given by…”
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Bulk Nuclear Hyperpolarization of Inorganic Solids by Relay from the Surface by Björgvinsdóttir, Snædís, Walder, Brennan J, Pinon, Arthur C, Emsley, Lyndon

“…NMR is a method of choice to determine structural and electronic features in inorganic materials, and has been widely used in the past, but its application is…”
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Maximizing nuclear hyperpolarization in pulse cooling under MAS by Björgvinsdóttir, Snædís, Walder, Brennan J., Matthey, Nicolas, Emsley, Lyndon

“…[Display omitted] •Proton-free materials can be hyperpolarized by relay from the surface.•We show how to maximize sensitivity gains in the bulk using pulse…”
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Hyperpolarization transfer pathways in inorganic materials by Björgvinsdóttir, Snædís, Moutzouri, Pinelopi, Walder, Brennan J., Matthey, Nicolas, Emsley, Lyndon

“…[Display omitted] •2D experiments are used to study the transfer of hyperpolarization from surface to bulk in proton-free inorganic materials.•Several examples…”
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Influence of Polymorphs and Local Defect Structures on NMR Parameters of Graphite Fluorides by Rimsza, Jessica M, Walder, Brennan J, Alam, Todd M

“…The role of local molecular structure on calculated 13C and 19F NMR chemical shifts for graphite fluoride materials was explored by using gauge-including…”
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Multipurpose Broadband NMR Inversion Sequences by Walder, Brennan J., McBrayer, Josefine D., Harrison, Katharine L., Fritzsching, Keith J.

“…Solution-state 2D correlation experiments increase signal-to-noise, provide improved resolution, and inform about molecular connectivity. NMR experiments are…”
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Colloidal-ALD-Grown Core/Shell CdSe/CdS Nanoplatelets as Seen by DNP Enhanced PASS–PIETA NMR Spectroscopy by Piveteau, Laura, Dirin, Dmitry N, Gordon, Christopher P, Walder, Brennan J, Ong, Ta-Chung, Emsley, Lyndon, Copéret, Christophe, Kovalenko, Maksym V

“…Ligand exchange and CdS shell growth onto colloidal CdSe nanoplatelets (NPLs) using colloidal atomic layer deposition (c-ALD) were investigated by solid-state…”
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Line narrowing in 1H NMR of powdered organic solids with TOP-CT-MAS experiments at ultra-fast MAS by Paruzzo, Federico M., Walder, Brennan J., Emsley, Lyndon

“…[Display omitted] •The CT-MAS experiment can be used to improve 1H resolution at 111 kHz MAS by 30%.•The TOP transformation drastically reduces experimental…”
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DNP enhanced NMR with flip-back recovery by Björgvinsdóttir, Snædís, Walder, Brennan J., Pinon, Arthur C., Yarava, Jayasubba Reddy, Emsley, Lyndon

“…[Display omitted] •Combining MAS DNP with flip-back yields up to a factor 3 increase in overall sensitivity.•Flip-back provides up to a 10-fold reduction in…”
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Determining the Surface Structure of Silicated Alumina Catalysts via Isotopic Enrichment and Dynamic Nuclear Polarization Surface-Enhanced NMR Spectroscopy by Rankin, Andrew G. M, Webb, Paul B, Dawson, Daniel M, Viger-Gravel, Jasmine, Walder, Brennan J, Emsley, Lyndon, Ashbrook, Sharon E

“…Isotopic enrichment of 29Si and DNP-enhanced NMR spectroscopy are combined to determine the detailed surface structure of a silicated alumina catalyst. The…”
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