Analysis of nuclear relaxation in granular systems
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Física
2006
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| _version_ | 1876460818787205120 |
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| author | Said R. Rabbani |
| author_facet | Said R. Rabbani |
| contents | Analysis of nuclear relaxation in granular systems Said R. Rabbani Christovam Mendonca Hernán Cervantes R. J. B. Mamani Física, Astronomía y Matemáticas Granular systems Nuclear relaxation The longitudinal nuclear magnetic relaxation time, T1, of powdered samples was analyzed following thetheory proposed by Browstein and Tarr to explain the T1 reduction of water confined in biological cells and theproposed by Rabbani and Edmonds where the molecular diffusion in liquids is substituted by spin diffusion tointerpret the T1 behavior in solid particles. We have shown that the multiexponential character of magnetizationdecay in solid particles with a narrow band size distribution allows to evaluate the spin diffusion coefficient ofthis material. On the other hand if the diffusion coefficient of a material is given and the average size of a sampleof this material is known the relaxation decay curve can be used to determine the surface relaxivity as well asthe relative size of particles present in the other samples of same material. However, this analysis is unable toprovide the absolut measurement of the grain sizes. Furthermore, it is shown that the grain geometry does notinfluence the relaxation decay curve. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436107 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.1A Vol.36 |
| format | Artículo científico |
| id | redalyc_46436107 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Analysis of nuclear relaxation in granular systems Said R. Rabbani Física, Astronomía y Matemáticas Granular systems Nuclear relaxation Analysis of nuclear relaxation in granular systems Said R. Rabbani Christovam Mendonca Hernán Cervantes R. J. B. Mamani Física, Astronomía y Matemáticas Granular systems Nuclear relaxation The longitudinal nuclear magnetic relaxation time, T1, of powdered samples was analyzed following thetheory proposed by Browstein and Tarr to explain the T1 reduction of water confined in biological cells and theproposed by Rabbani and Edmonds where the molecular diffusion in liquids is substituted by spin diffusion tointerpret the T1 behavior in solid particles. We have shown that the multiexponential character of magnetizationdecay in solid particles with a narrow band size distribution allows to evaluate the spin diffusion coefficient ofthis material. On the other hand if the diffusion coefficient of a material is given and the average size of a sampleof this material is known the relaxation decay curve can be used to determine the surface relaxivity as well asthe relative size of particles present in the other samples of same material. However, this analysis is unable toprovide the absolut measurement of the grain sizes. Furthermore, it is shown that the grain geometry does notinfluence the relaxation decay curve. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46436107 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.1A Vol.36 |
| title | Analysis of nuclear relaxation in granular systems |
| topic | Física, Astronomía y Matemáticas Granular systems Nuclear relaxation |
| url | https://www.redalyc.org/articulo.oa?id=46436107 |