[Application de la relaxométrie RMN à cycle de champ à l'étude des effects induits par les ultrasons sur la dynamique moléculaire et l'ordre dans les matériaux mésomorphiques]
Une caractéristique des techniques de Résonance Magnétique Nucléaire (RMN) est la possibilité de suivre l'évolution des spins nucléaires dans une large gamme de fréquence de Larmor. On a développé une instrumentation apte à étendre les études de la relaxation des spins nucléaires jusqu'à des fréquences de Larmor inférieures à 1 kilohertz. Cette technique est la relaxométrie RMN à cycle de champ. Le présent article concerne une version expérimentale dans laquelle l'échantillon étudié est simultanément irradié par des ultrasons. Comme les ultrasons se couplent sélectivement à la dynamique collective des cristaux liquides, cette méthode ouvre des perspectives nouvelles pour l'étude de la dynamique moléculaire par relaxation RMN dans ces matériaux.
A salient characteristic of nuclear magnetic resonance (NMR) techniques is the possibility to scan nuclear spin evolutions within a broad Larmor frequency range. Special instrumentation was developed to extend nuclear spin relaxation studies up to proton Larmor frequencies in the sub-kilohertz regime, a technique known as field-cycling NMR relaxometry. This article refers to an experimental version where the sample under study is selectively subjected to ultrasonic irradiation. The fact that ultrasound couples selectively to the collective dynamics of liquid crystals, offers new insights for the study of the molecular dynamics in these materials using NMR relaxation.
Mot clés : Ultrasons, Relaxation RMN, Relaxométrie, Cycle de champ, Nématique, Smectique, Dispersion de relaxation
@article{CRPHYS_2010__11_2_160_0,
author = {Esteban Anoardo},
title = {Application of field-cycling {NMR} relaxometry to the study of ultrasound-induced effects in the molecular dynamics and order of mesomorphic materials},
journal = {Comptes Rendus. Physique},
pages = {160--171},
publisher = {Elsevier},
volume = {11},
number = {2},
year = {2010},
doi = {10.1016/j.crhy.2010.06.017},
language = {en},
}
TY - JOUR AU - Esteban Anoardo TI - Application of field-cycling NMR relaxometry to the study of ultrasound-induced effects in the molecular dynamics and order of mesomorphic materials JO - Comptes Rendus. Physique PY - 2010 SP - 160 EP - 171 VL - 11 IS - 2 PB - Elsevier DO - 10.1016/j.crhy.2010.06.017 LA - en ID - CRPHYS_2010__11_2_160_0 ER -
%0 Journal Article %A Esteban Anoardo %T Application of field-cycling NMR relaxometry to the study of ultrasound-induced effects in the molecular dynamics and order of mesomorphic materials %J Comptes Rendus. Physique %D 2010 %P 160-171 %V 11 %N 2 %I Elsevier %R 10.1016/j.crhy.2010.06.017 %G en %F CRPHYS_2010__11_2_160_0
Esteban Anoardo. Application of field-cycling NMR relaxometry to the study of ultrasound-induced effects in the molecular dynamics and order of mesomorphic materials. Comptes Rendus. Physique, Volume 11 (2010) no. 2, pp. 160-171. doi : 10.1016/j.crhy.2010.06.017. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2010.06.017/
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