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Title: Angular flow in toroid cavity probes.

Abstract

NMR signals from samples that rotate uniformly about the central conductor of a TCD (toroid cavity detector) exhibit frequency shifts that are directly proportional to the sample's angular velocity. This newly observed effect is based on the unique radiofrequency field inside TCDs, which is variable in direction. If a liquid sample is pumped through a capillary tube wound about the central conductor, the frequency shift is proportional to the flow rate. A mathematical relationship between a volumetric flow rate and the frequency shift is established and experimentally verified to high precision. Additionally, two-dimensional flow-resolved NMR spectroscopy for discrimination between components with different flow velocities yet retaining chemical shift information for structural analysis is presented. The application of the two-dimensional method in chromatographic NMR is suggested. Furthermore, utilization of the frequency-shift effect for rheologic studies if combined with toroid-cavity rotating-frame imaging is proposed.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); FOR
OSTI Identifier:
949291
Report Number(s):
ANL/CMT/JA-39664
Journal ID: ISSN 1090-7807; JMARF3; TRN: US1003471
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
J. Magn. Resonance
Additional Journal Information:
Journal Volume: 151; Journal Issue: 2 ; Aug. 2001; Journal ID: ISSN 1090-7807
Country of Publication:
United States
Language:
ENGLISH
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANGULAR VELOCITY; CHEMICAL SHIFT; FLOW RATE; IMAGE PROCESSING; PROBES; SPECTROSCOPY; NUCLEAR MAGNETIC RESONANCE

Citation Formats

Trautner, P, Woelk, K, Bargon, J, Gerald, R E, Chemical Engineering, and Univ. of Bonn. Angular flow in toroid cavity probes.. United States: N. p., 2001. Web. doi:10.1006/jmre.2001.2355.
Trautner, P, Woelk, K, Bargon, J, Gerald, R E, Chemical Engineering, & Univ. of Bonn. Angular flow in toroid cavity probes.. United States. https://doi.org/10.1006/jmre.2001.2355
Trautner, P, Woelk, K, Bargon, J, Gerald, R E, Chemical Engineering, and Univ. of Bonn. 2001. "Angular flow in toroid cavity probes.". United States. https://doi.org/10.1006/jmre.2001.2355.
@article{osti_949291,
title = {Angular flow in toroid cavity probes.},
author = {Trautner, P and Woelk, K and Bargon, J and Gerald, R E and Chemical Engineering and Univ. of Bonn},
abstractNote = {NMR signals from samples that rotate uniformly about the central conductor of a TCD (toroid cavity detector) exhibit frequency shifts that are directly proportional to the sample's angular velocity. This newly observed effect is based on the unique radiofrequency field inside TCDs, which is variable in direction. If a liquid sample is pumped through a capillary tube wound about the central conductor, the frequency shift is proportional to the flow rate. A mathematical relationship between a volumetric flow rate and the frequency shift is established and experimentally verified to high precision. Additionally, two-dimensional flow-resolved NMR spectroscopy for discrimination between components with different flow velocities yet retaining chemical shift information for structural analysis is presented. The application of the two-dimensional method in chromatographic NMR is suggested. Furthermore, utilization of the frequency-shift effect for rheologic studies if combined with toroid-cavity rotating-frame imaging is proposed.},
doi = {10.1006/jmre.2001.2355},
url = {https://www.osti.gov/biblio/949291}, journal = {J. Magn. Resonance},
issn = {1090-7807},
number = 2 ; Aug. 2001,
volume = 151,
place = {United States},
year = {2001},
month = {8}
}