Quantum Size Effects in Solid State - Nuclear Magnetic Resonance of metallic particles
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| Format: | Artículo científico |
| Language: | en |
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Universidad San Francisco de Quito
2015
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| _version_ | 1876461502728241152 |
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| author | Santiago Gangotena |
| author_facet | Santiago Gangotena |
| contents | Quantum Size Effects in Solid State - Nuclear Magnetic Resonance of metallic particles Santiago Gangotena Multidisciplinaria (Ciencias Naturales y Exactas) NMR spin saturation Knight shift nuclear spin This work involves the preparation of small metallic particles (of diameters of 200 Å or less) possessing a nuclear spin, I = 1/2, to be used to study quantum size effects (QSE) and surface effects using continuous wave (CW) nuclear magnetic resonance (NMR) techniques. Solvation and pulse methods were used to determine longitudinal relaxation times, T1, for lead and aluminum powders, where absolute values were found to be 0.45±0.09 and 4.85±0.70 for 207Pb and 27Al, respectively. Approximate values for the Knight shift were also determined (0.168 average for 207Pb and 1.24 for 27Al). In contrast to these findings, 109Ag analysis produced values with high degree of uncertainty. Relaxation times are compared between small particle and bulk measurements, and the relaxation mechanisms and parameters are described. 2015 artículo científico 1390-5384 https://www.redalyc.org/articulo.oa?id=726180879005 en http://www.redalyc.org/revista.oa?id=7261 Avances en Ciencias e Ingenierías application/pdf Universidad San Francisco de Quito Avances en Ciencias e Ingenierías (Ecuador) Num.1 Vol.7 |
| format | Artículo científico |
| id | redalyc_726180879005 |
| institution | Redalyc |
| language | en |
| publishDate | 2015 |
| publisher | Universidad San Francisco de Quito |
| spellingShingle | Quantum Size Effects in Solid State - Nuclear Magnetic Resonance of metallic particles Santiago Gangotena Multidisciplinaria (Ciencias Naturales y Exactas) NMR spin saturation Knight shift nuclear spin Quantum Size Effects in Solid State - Nuclear Magnetic Resonance of metallic particles Santiago Gangotena Multidisciplinaria (Ciencias Naturales y Exactas) NMR spin saturation Knight shift nuclear spin This work involves the preparation of small metallic particles (of diameters of 200 Å or less) possessing a nuclear spin, I = 1/2, to be used to study quantum size effects (QSE) and surface effects using continuous wave (CW) nuclear magnetic resonance (NMR) techniques. Solvation and pulse methods were used to determine longitudinal relaxation times, T1, for lead and aluminum powders, where absolute values were found to be 0.45±0.09 and 4.85±0.70 for 207Pb and 27Al, respectively. Approximate values for the Knight shift were also determined (0.168 average for 207Pb and 1.24 for 27Al). In contrast to these findings, 109Ag analysis produced values with high degree of uncertainty. Relaxation times are compared between small particle and bulk measurements, and the relaxation mechanisms and parameters are described. 2015 artículo científico 1390-5384 https://www.redalyc.org/articulo.oa?id=726180879005 en http://www.redalyc.org/revista.oa?id=7261 Avances en Ciencias e Ingenierías application/pdf Universidad San Francisco de Quito Avances en Ciencias e Ingenierías (Ecuador) Num.1 Vol.7 |
| title | Quantum Size Effects in Solid State - Nuclear Magnetic Resonance of metallic particles |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) NMR spin saturation Knight shift nuclear spin |
| url | https://www.redalyc.org/articulo.oa?id=726180879005 |