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By Evans, Charles A.; Ishida, Hatsuo; Brundle, C. Richard

Composite fabrics make their method into all facets of recent technological society, yet relatively so for functions requiring nice power and light-weight weight resembling within the aerospace undefined. simply because they're hybrid heterogeneous fabrics, they ca

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Schatz, and J. Klein, Appl. Phys. , 56, 1228, 1990. P. J. J. D. Smith, Macromolecules, 24, 477, 1991. P. J. Smith, Macromolecules, submitted for publication, 1992. 24 C. Galiotis, Composite interfaces, accepted for publication, 1992. 25 C. Galiotis, Composites Sci. , 42, 125, 1991. 26 N. Melanitis and C. Galiotis, J. Mater. , 25, 5081, 1990. 27 H. Jahankhani and C. Galiotis, J. , 25, 609, 1991. indd 42 RAMAN SPECTROSCOPY Chapter 2 3/1/10 2:18 PM 28 H. Ishida, H. Fukuda, G. Katagiri, and A. Ishitani, Appl.

Due to the higher population of molecules in the ground vibrational state (0) as compared to those in the excited state (1) at room temperature. Therefore, the Stokes lines are usually utilized in the study of Raman scattering. The main limitation of Raman spectroscopy for studying thin organic films adsorbed onto metal surfaces is that the low intensity of the Raman scattering must be detected in the presence of a large background. For example, the intensity expected from a monolayer of molecules of average Raman cross section adsorbed onto a typical transition metal surface is2 about 250 photons/sec.

However, bands due to the P2VP block observed near 1073 cm–1, 1161 cm–1, 1336 cm–1, and 1585 cm–1 were relatively strong in intensity in the SERS spectra. These results indicated that the SERS spectra observed for P2VP/PS block copolymers were mostly contributed by the P2VP block. Since SERS is a surface-selective effect, the results obtained confirmed that the P2VP block preferentially adsorbed onto the silver surface, while the PS block was positioned away from the surface. Very recently, Hong et al.

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