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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
23/03/2005 |
Data da última atualização: |
23/03/2005 |
Autoria: |
LEITE, F. L.; RIUL JÚNIOR, A.; HERRMANN, P. S. P. |
Título: |
Mapping of adhesion forces on soil minerals in air and water by atomic force spectroscopy (AFS). |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Journal of adhesion Science and Technology, v. 17, n. 16, p. 2141-2156, 2003. |
Idioma: |
Inglês |
Conteúdo: |
The adhesion force between an atomic force microscope (AFM) tip and sample surfaces, mica and quartz substrates, was measured in air and water. The force curves show that the adhesion has a strong dependence on both the surface roughness and the environmental conditions surrounding the sample. The variability of the adhesion force was examined in a series of measurements taken at the same point, as well as at different places on the sample surface. The adhesion maps obtained from the distribution of the measured forces indicated regions contaminated by either organic compounds or adsorbed water. Using simple mathematical expressions we could quantitatively predict the adhesion force behavior in both air and water. The experimental results are in good agreement with theoretical calculations, where the adhesion forces in air and water were mostly associated with capillary and van der Waals forces, respectively. A smalllong-range repulsive force is also observed in water due to the overlapping electrical double-layers formed on both the tip and sample surfaces. |
Palavras-Chave: |
Forças de Adesão; Microscopia de Força Atômica; Minerais do Solo; Spectroscopia de Força Atômica. |
Categoria do assunto: |
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Marc: |
LEADER 01702naa a2200193 a 4500 001 1028873 005 2005-03-23 008 2003 bl --- 0-- u #d 100 1 $aLEITE, F. L. 245 $aMapping of adhesion forces on soil minerals in air and water by atomic force spectroscopy (AFS). 260 $c2003 520 $aThe adhesion force between an atomic force microscope (AFM) tip and sample surfaces, mica and quartz substrates, was measured in air and water. The force curves show that the adhesion has a strong dependence on both the surface roughness and the environmental conditions surrounding the sample. The variability of the adhesion force was examined in a series of measurements taken at the same point, as well as at different places on the sample surface. The adhesion maps obtained from the distribution of the measured forces indicated regions contaminated by either organic compounds or adsorbed water. Using simple mathematical expressions we could quantitatively predict the adhesion force behavior in both air and water. The experimental results are in good agreement with theoretical calculations, where the adhesion forces in air and water were mostly associated with capillary and van der Waals forces, respectively. A smalllong-range repulsive force is also observed in water due to the overlapping electrical double-layers formed on both the tip and sample surfaces. 653 $aForças de Adesão 653 $aMicroscopia de Força Atômica 653 $aMinerais do Solo 653 $aSpectroscopia de Força Atômica 700 1 $aRIUL JÚNIOR, A. 700 1 $aHERRMANN, P. S. P. 773 $tJournal of adhesion Science and Technology$gv. 17, n. 16, p. 2141-2156, 2003.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Registros recuperados : 34 | |
5. | | TAKEDA, H. H.; FIRMINO, A.; RIUL JÚNIOR, A.; FONSECA, F. J.; MATTOSO, L. H. C. Língua eletrônica para diferenciação de paladares doce, salgado, azedo e amargo. In: SIMPÓSIO LATINO AMERICANO DE CIÊNCIA DE ALIMENTOS, 5. nov. 2003, Campinas, SP. [Resumos...] Campinas: UNICAMP, 2003. [CD-ROM].Biblioteca(s): Embrapa Instrumentação. |
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11. | | OLIVEIRA JÚNIOR, O. N.; ZUCOLOTTO, V.; FERREIRA, M.; MATTOSO, L. H. C.; RIUL JÚNIOR, A. Nanostructured films employed in sensors. In: SUPRAMOLECULAR ENGINEERING OF CONDUCTING MATERIALS, 2005, Safety Harbor, USA. Capítulo de livro. Safety Harbor, USA: Fractal System, 2005.Biblioteca(s): Embrapa Instrumentação. |
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15. | | MATTOSO, L. H. C.; MELLO, S. V.; RIUL JÚNIOR, A.; TELLES, G. D.; OLIVEIRA JÚNIOR, O. N. Langmuir and Langmuir-blodgett films of parent polyaniline doped with functionalized acids. In: INTERNATIONAL CONFERENCE ON SCIENCE AND TECHONOLOGY OF SYNTHETIC METALS, jul. 1994, Seoul, Korea. Abstracts... Seoul, Korea: The Organizing Committee of ICSM '94, 1994. Ref. THR P83. 524Biblioteca(s): Embrapa Instrumentação. |
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17. | | RIUL JUNIOR, A.; OLIVEIRA JUNIOR, O. N.; TELLES, G. D.; MATTOSO, L. H. C.; FARIA, R. M. Characterization of Langmuir-Blodgett films of parent polyaniline. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 7., Sept. 1995, Numana, Ancona, Italia. Abstract book... [S.l.: s.n.], 1995. p.33. Ref.P-1.99.Biblioteca(s): Embrapa Instrumentação. |
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18. | | RIUL JUNIOR, A.; DHANABALAN, A.; MATTOSO, L. H. C.; SOUZA, L. M. de; TICIANELLI, E. A.; OLIVEIRA JUNIOR, O. N. Characterization of 16-MER polyaniline composite LB films. In: INTERNATIONAL CONFERENCE ON ORGANIZED MOLECULAR FILMS, 8., aug. 1997, Asilomar, CA, USA. Abstract & program booklet... Davis: University of California, 1997. não paginado. Ref: 7-P-28.Biblioteca(s): Embrapa Instrumentação. |
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Registros recuperados : 34 | |
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