Analysis of nuclear relaxation in granular systems

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dc.contributor.authorRabbani S.R.
dc.contributor.authorMendonca C.
dc.contributor.authorMamani J.B.
dc.contributor.authorHernan Cervantes R.
dc.date.accessioned2024-03-13T01:43:18Z
dc.date.available2024-03-13T01:43:18Z
dc.date.issued2006
dc.description.abstractThe longitudinal nuclear magnetic relaxation time, T1, of powdered samples was analyzed following the theory proposed by Browstein and Tarr to explain the T1 reduction of water confined in biological cells and the proposed by Rabbani and Edmonds where the molecular diffusion in liquids is substituted by spin diffusion to interpret the T1 behavior in solid particles. We have shown that the multiexponential character of magnetization decay in solid particles with a narrow band size distribution allows to evaluate the spin diffusion coefficient of this material. On the other hand if the diffusion coefficient of a material is given and the average size of a sample of this material is known the relaxation decay curve can be used to determine the surface relaxivity as well as the relative size of particles present in the other samples of same material. However, this analysis is unable to provide the absolut measurement of the grain sizes. Furthermore, it is shown that the grain geometry does not influence the relaxation decay curve.
dc.description.firstpage28
dc.description.issuenumber1 A
dc.description.lastpage33
dc.description.volume36
dc.identifier.doi10.1590/S0103-97332006000100008
dc.identifier.issn0103-9733
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/37834
dc.relation.ispartofBrazilian Journal of Physics
dc.rightsAcesso Aberto
dc.subject.otherlanguageGranular systems
dc.subject.otherlanguageNuclear relaxation
dc.titleAnalysis of nuclear relaxation in granular systems
dc.typeArtigo
local.scopus.citations5
local.scopus.eid2-s2.0-33645668976
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33645668976&origin=inward
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