Brennan James Walder

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Lead-Oxygen Bond Length Distributions of the Relaxor Ferroelectric 0.67PbMg(1/3)Nb(2/3)O(3)-0.33PbTiO(3) from Pb-207 Nuclear Magnetic Resonance

David Lyndon Emsley, Brennan James Walder, Claudia Esther Avalos

We investigate changes in the local environment of Pb-207 sites in the relaxor ferroelectric 0.67PbMg(1/3)Nb(2/3)O(3)-0.33PbTiO(3) using variable temperature magic angle spinning nuclear magnetic resonance. We observe a Gaussian distribution of Pb-207 chem ...

AMER CHEMICAL SOC2019

One- and Two-Dimensional High-Resolution NMR from Flat Surfaces

David Lyndon Emsley, Aaron James Rossini, Brennan James Walder

Determining atomic-level characteristics of molecules on two-dimensional surfaces is one of the fundamental challenges in chemistry. High-resolution nuclear magnetic resonance (NMR) could deliver rich structural information, but its application to two-dime ...

AMER CHEMICAL SOC2019

Maximizing nuclear hyperpolarization in pulse cooling under MAS

David Lyndon Emsley, Brennan James Walder, Nicolas Luc Matthey

It has recently been shown how dynamic nuclear polarization can be used to hyperpolarize the bulk of proton-free solids. This is achieved by generating the polarization in a wetting phase, transferring it to nuclei near the surface and relaying it towards ...

Academic Press Inc - Elsevier Science2019

Bulk Nuclear Hyperpolarization of Inorganic Solids by Relay from the Surface

David Lyndon Emsley, Arthur César Pinon, Brennan James Walder, Snaedis Björgvinsdóttir

2018

DNP enhanced NMR with flip-back recovery

David Lyndon Emsley, Arthur César Pinon, Brennan James Walder, Jayasubba Reddy Yarava, Snaedis Björgvinsdóttir

Academic Press Inc - Elsevier Science2018

207Pb NMR of ferroelectric perovskite lead germanate at and below the paraelectric phase transition

David Lyndon Emsley, Brennan James Walder, Jasmine Viger-Gravel, Claudia Esther Avalos

AMER CHEMICAL SOC2018

Resolving the Core and the Surface of CdSe Quantum Dots and Nanoplatelets Using Dynamic Nuclear Polarization Enhanced PASS-PIETA NMR Spectroscopy

David Lyndon Emsley, Brennan James Walder, Laura Piveteau

Understanding the surface of semiconductor nanocrystals (NCs) prepared using colloidal methods is a long-standing goal of paramount importance for all their potential optoelectronic applications, which remains unsolved largely because of the lack of site-s ...

2018

Using 207Pb NMR to investigate temperature dependent nuclear spin relaxation and Pb-O bond covalency in relaxor ferroelectrics

David Lyndon Emsley, Brennan James Walder, Claudia Esther Avalos

AMER CHEMICAL SOC2018

Determining the Surface Structure of Silicated Alumina Catalysts via Isotopic Enrichment and Dynamic Nuclear Polarization Surface-Enhanced NMR Spectroscopy

David Lyndon Emsley, Brennan James Walder, Jasmine Viger-Gravel

Isotopic enrichment of Si-29 and DNP-enhanced NMR spectroscopy are combined to determine the detailed surface structure of a silicated alumina catalyst. The significant sensitivity enhancement provided by DNP is vital to the acquisition of multinuclear and ...

American Chemical Society2017

The Atomic-Level Structure of Cementitious Calcium Silicate Hydrate

David Lyndon Emsley, Karen Scrivener, Paul Bowen, Aaron James Rossini, Albert Hofstetter, Brennan James Walder, Abhishek Kumar, Aslam Kunhi Mohamed, Bhuvanesh Srinivasan

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 silicate hydrate phases, which form about 50-60% by volume of cement paste. Here we describe the first ...

2017

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