US 12,444,526 B2
Methods of dynamic mechanical analysis using nuclear magnetic resonance
William Selby, Fredericton (CA); Igor Mastikhin, Fredericton (CA); and Phil Garland, Fredericton (CA)
Assigned to THE UNIVERSITY OF NEW BRUNSWICK, Fredericton (CA)
Filed by William Selby, Fredericton (CA); Igor Mastikhin, Fredericton (CA); and Phil Garland, Fredericton (CA)
Filed on Mar. 31, 2023, as Appl. No. 18/129,564.
Prior Publication US 2024/0331908 A1, Oct. 3, 2024
Int. Cl. G01V 3/00 (2006.01); G01R 33/383 (2006.01); H01F 7/02 (2006.01)
CPC H01F 7/0278 (2013.01) [G01R 33/383 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of dynamic mechanical analysis of a sample comprising:
providing a magnet to generate a constant gradient where at least a portion of the sample is in the constant gradient;
inducing a vibration in the sample in the direction of the constant magnetic field gradient, the vibration comprising a vibration waveform and a vibration period;
generating an nuclear magnetic resonance (NMR) pulse sequence comprising at least two pulses with a delay between the pulses;
acquiring echos from the pulse sequence at multiple points along the vibration period;
measuring the phase of the NMR signal at each of the acquired echos;
using the phase of the NMR signal to measure the velocity of the vibration at the multiple points where the echos are acquired;
using the velocity measurements to acquire a velocity waveform; and
using the velocity waveform and processing the velocity waveform to extract the loss angle and the magnitude of the dynamic modulus of the sample.