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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

New and rapid pulse sequences for two-dimensional D-T-1 correlation measurements

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Author(s):
Montrazi, Elton Tadeu [1] ; Monaretto, Tatiana [2] ; Bonagamba, Tito Jose [1] ; Colnago, Luiz Alberto [3]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Chem, POB 780, BR-13560970 Sao Carlos, SP - Brazil
[3] Embrapa Instrumentat, POB 741, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF MAGNETIC RESONANCE; v. 315, JUN 2020.
Web of Science Citations: 0
Abstract

Longitudinal relaxation time (T-1), transverse relaxation time (T-2) and diffusion coefficient (D) values have been widely used for the characterizations of materials using low field Time Domain Nuclear Magnetic Resonance (TD-NMR). Each parameter can be determined using one-dimensional techniques or their values and correlations by multi-dimensional experiments such as T-1-T-2, D-T-2, and T-1-D-T-2. In this work, we studied four D-T-1 sequences for TD-NMR combining Stejskal-Tanner Pulse Gradient Spin Echo (PGSE) diffusion measurement with Inversion-Recovery (IR), Saturation-Recovery (SR), Small-Angle Continuous Wave Free Precession (CWFP-T-1) and Small-Angle Flip-Flop (SAFF) for T-1 measurement. The results show that rapid D-T-1 measurements can be obtained with single shot CWFP-T-1 and SAFF sequences. The two sequences were two and eight time fast than sequences based on SR and IR, respectively. Although the two fast sequences yield low signal-to-noise ratio signal, they can be as fast as the traditional D-T-2 experiment, or even faster, because it is not necessary to wait a recycle delay of 5 T-1. Another advantage of the CWFP-T-1 and SAFF methods, when compared to the one based on SR or CPMG (for D-T-2) are the low specific absorption rate (SAR) of these sequences due the low flip angles in the sequences, that reduces the sample heating problem. These sequences were initially studied using phantom samples. They also were used to study plant tissues to observe the anisotropic diffusion in asparagus. Therefore, they can be useful methods for practical application in TD-NMR. (C) 2020 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 19/13656-8 - Development and application of nuclear magnetic resonance in products and agricultural processes
Grantee:Luiz Alberto Colnago
Support Opportunities: Regular Research Grants
FAPESP's process: 09/54880-6 - Manipulation of nuclear spins by magnetic and quadrupole resonance techniques
Grantee:Tito José Bonagamba
Support Opportunities: Regular Research Grants
FAPESP's process: 17/12864-0 - Effect of NMR magnetic field in chemical reactions monitored NMR in situ
Grantee:Luiz Alberto Colnago
Support Opportunities: Regular Research Grants
FAPESP's process: 12/00380-5 - Evaluation of resistance to cyclic fatigue of rotary and reciprocal systems
Grantee:Idomeo Bonetti Filho
Support Opportunities: Regular Research Grants