You need JavaScript to view this

Neutron spin echo spectroscopy. Its application to the study of the dynamics of polymers in solution; La spectrometrie par echos de spins de neutrons. Application a l'etude de la dynamique des polymeres en solution

Thesis/Dissertation:

Abstract

This work focuses on Neutron Spin Echo (NSE) spectroscopy and on the NSE spectrometer MESS, which we have built at the L.L.B. (CE Saclay). After analyzing in detail the classical and quantum principles of this type of instrument, and illustrated them with optical analogies, we expound a simple formalism for the interpretation of polarized neutron experiments of the most general type. In a second part, we describe the MESS spectrometer extensively; its characteristics and performances as well as the first results obtained with this instrument. In particular, we include two papers showing how the neutron depolarization, spin rotation and echoes can be used to investigate high-Tc superconductors. The last part deals with the dynamics of Polymer-Polymer-Solvent ternary solutions and demonstrates how the Neutron Spin Echo technique becomes a privileged tool for such physico-chemical studies thanks to the joint use of NSE and contrast variation methods, coupled with the adequate ranges of time and scattering vectors accessible. Finally, we describe the specific case of partially deuterated polydimethyl-siloxane (PDMS) in semi-dilute solution in Toluene. We have experimentally and separately evidenced the cooperative and inter-diffusive diffusion modes predicted by the theory of Akcasu, Benoit, Benmouna et al. These results, obtained at the L.L.B.  More>>
Authors:
Publication Date:
Jun 15, 1992
Product Type:
Thesis/Dissertation
Report Number:
CEA-N-2691
Resource Relation:
Other Information: 29 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; These Docteur en Science
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BROWNIAN MOVEMENT; DYNAMICS; HIGH-TC SUPERCONDUCTORS; MOTION; NEUTRON DIFFRACTION; NEUTRON SPECTROMETERS; NEUTRON SPECTROSCOPY; POLARIZED PRODUCTS; POLYMERS; PRECESSION; SILOXANES; SMALL ANGLE SCATTERING; SOLUTIONS; SOLVENTS; SPIN ECHO; SPIN FLIP
OSTI ID:
22240189
Research Organizations:
Universite de Paris-Sud, Centre d'Orsay (France); Centre d'Etudes de Saclay, Direction des Sciences de la Matiere, Departement de Recherche sur l'Etat Condense, les Atomes et les Molecules, Laboratoire Leon Brillouin (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR1401040061286
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
221 page(s)
Announcement Date:
Jun 12, 2014

Thesis/Dissertation:

Citation Formats

Papoular, Robert. Neutron spin echo spectroscopy. Its application to the study of the dynamics of polymers in solution; La spectrometrie par echos de spins de neutrons. Application a l'etude de la dynamique des polymeres en solution. France: N. p., 1992. Web.
Papoular, Robert. Neutron spin echo spectroscopy. Its application to the study of the dynamics of polymers in solution; La spectrometrie par echos de spins de neutrons. Application a l'etude de la dynamique des polymeres en solution. France.
Papoular, Robert. 1992. "Neutron spin echo spectroscopy. Its application to the study of the dynamics of polymers in solution; La spectrometrie par echos de spins de neutrons. Application a l'etude de la dynamique des polymeres en solution." France.
@misc{etde_22240189,
title = {Neutron spin echo spectroscopy. Its application to the study of the dynamics of polymers in solution; La spectrometrie par echos de spins de neutrons. Application a l'etude de la dynamique des polymeres en solution}
author = {Papoular, Robert}
abstractNote = {This work focuses on Neutron Spin Echo (NSE) spectroscopy and on the NSE spectrometer MESS, which we have built at the L.L.B. (CE Saclay). After analyzing in detail the classical and quantum principles of this type of instrument, and illustrated them with optical analogies, we expound a simple formalism for the interpretation of polarized neutron experiments of the most general type. In a second part, we describe the MESS spectrometer extensively; its characteristics and performances as well as the first results obtained with this instrument. In particular, we include two papers showing how the neutron depolarization, spin rotation and echoes can be used to investigate high-Tc superconductors. The last part deals with the dynamics of Polymer-Polymer-Solvent ternary solutions and demonstrates how the Neutron Spin Echo technique becomes a privileged tool for such physico-chemical studies thanks to the joint use of NSE and contrast variation methods, coupled with the adequate ranges of time and scattering vectors accessible. Finally, we describe the specific case of partially deuterated polydimethyl-siloxane (PDMS) in semi-dilute solution in Toluene. We have experimentally and separately evidenced the cooperative and inter-diffusive diffusion modes predicted by the theory of Akcasu, Benoit, Benmouna et al. These results, obtained at the L.L.B. (CE Saclay) are the subject matter of the last paper included in this work. (author) [French] Ce memoire est centre sur la spectroscopie par echos de spins de neutrons, et plus particulierement, sur le spectrometre a echos de spins MESS que nous avons construit au L.L.B (CE/Saclay). Apres avoir detaille les principes classique et quantique de ce type d'instrument et les avoir illustres par des analogies optiques, nous detaillons un formalisme simple permettant d'interpreter les experiences utilisant les neutrons polarises dans le cas le plus general. Une seconde partie decrit de maniere approfondie le spectrometre MESS de Saclay: ses caracteristiques et ses performances, ainsi que les premiers resultats physiques que nous avons obtenus a l'aide de MESS. En particulier, ce memoire inclut deux articles montrant comment la depolarisation des neutrons, la rotation des spins et les echos de spins peuvent etre utilises pour etudier les supraconducteurs de haut-Tc. La derniere partie traite de la dynamique des systemes ternaires Polymere-Polymere-Solvant et montre comment l'utilisation conjointe des echos de spins de neutrons et des methodes de variation de contraste font des Echos de Spins de Neutrons un outil privilegie pour de telles etudes physico-chimiques, et cela grace aux gammes de temps et de vecteurs de diffusion accessibles par cette technique. Enfin, le cas specifique du polydimethylsiloxane partiellement deuterie en solution semi-diluee dans le toluene est decrit. Nous avons mis en evidence experimentalement et separement les modes diffusifs cooperatif et interdiffusif predits par la theorie de Akcasu, Benoit Benmouna et al. Ces resultats, obtenus au L.L.B. (Saclay), font l'objet du dernier article de cette these. (auteur)}
place = {France}
year = {1992}
month = {Jun}
}