Time-resolved nuclear spin-dependent small-angle neutron scattering from polarised proton domains in deuterated solutions

We have investigated the process of dynamic proton polarisation by means of time-resolved polarised small-angle neutron scattering (SANS) on frozen solutions of EHBA-CrV molecules in glycerol-water mixtures as a function of the concentration of EHBA-CrV and for different degrees of deuteration of th...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2006-01, Vol.49 (2), p.157-165
Main Authors: VAN DEN BRANDT, B, GLÄTTLI, H, MICHELS, A, STUHRMANN, H. B, ZIMMER, O, GRILLO, I, HAUTLE, P, JOUVE, H, KOHLBRECHER, J, KONTER, J. A, LEYMARIE, E, MANGO, S, MAY, R. P
Format: Article
Language:English
Subjects:
Condensed Matter
Condensed matter: structure, mechanical and thermal properties
Deuteration
Exact sciences and technology
Glycerol-Water
Neutron diffraction and scattering
Neutron scattering
Neutron scattering techniques (including small-angle scattering)
Neutrons
Nuclear spin
Other
Physics
Polarization
Protons
Scattering functions
Solvents
Spin dynamics
Structure of solids and liquids
crystallography
Time dependence
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Summary:We have investigated the process of dynamic proton polarisation by means of time-resolved polarised small-angle neutron scattering (SANS) on frozen solutions of EHBA-CrV molecules in glycerol-water mixtures as a function of the concentration of EHBA-CrV and for different degrees of deuteration of the solvent. In the EHBA-CrV complex, the spins of the 20 protons which surround the paramagnetic CrV can be oriented using the method of dynamic nuclear polarisation (DNP), thereby offering the possibility to create locally a nuclear spin-dependent contrast for SANS. The time constants which describe the build-up of polarisation around the paramagnetic centre and the subsequent diffusion of polarisation in the solvent were determined by analysing the temporal evolution of the nuclear polarisation, which in turn was obtained by fitting a core-shell model to the time-dependent SANS curves. The results on the spin dynamics obtained using the scattering function of a core-shell could be independently confirmed by evaluating the integrated SANS intensity. A thermodynamic one-centre model is presented which is able to reproduce the observed dependence of the proton polarisation times on the proton concentration of the solvent.
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/e2006-00037-9