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Träfflista för sökning "WFRF:(Osorio A) srt2:(2000-2004)"

Sökning: WFRF:(Osorio A) > (2000-2004)

  • Resultat 1-10 av 14
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1.
  • de Oliveira, A. C., et al. (författare)
  • Spectroscopy studies of 4H-SiC
  • 2002
  • Ingår i: Materials Research. ; 6, s. 43-
  • Tidskriftsartikel (refereegranskat)
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2.
  • Ahuja, Rajeev, et al. (författare)
  • Optical properties of 4H-SiC
  • 2002
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 91:4, s. 2099-2103
  • Tidskriftsartikel (refereegranskat)abstract
    • The optical band gap energy and the dielectric functions of n-type 4H-SiC have been investigated experimentally by transmission spectroscopy and spectroscopic ellipsometry and theoretically by an ab initio full-potential linear muffin-tin-orbital method. We present the real and imaginary parts of the dielectric functions, resolved into the transverse and longitudinal photon moment a, and we show that the anisotropy is small in 4H-SiC. The measurements and the calculations fall closely together in a wide range of energies.
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3.
  • Ahuja, R., et al. (författare)
  • Optical properties of 4H-SiC
  • 2002
  • Ingår i: J. Appl. Phys.. ; 91:4, s. 2099-2103
  • Tidskriftsartikel (refereegranskat)
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7.
  • Vilaplana, Francisco, et al. (författare)
  • Swelling behavior of PDMS-PMHS pervaporation membranes in ethyl acetate-water mixtures
  • 2004
  • Ingår i: Journal of Applied Polymer Science. - : Wiley. - 0021-8995 .- 1097-4628. ; 93:3, s. 1384-1393
  • Tidskriftsartikel (refereegranskat)abstract
    • Pervaporation composite membranes were prepared with a three-layer structure: a PP support, a PEI microporous structure, and a PDMS-PMHS selective layer. Swelling tests were performed in water, ethyl acetate, and four different ethyl acetate-water mixtures, to calculate the diffusional and swelling parameters. Moreover, the dynamic-mechanical properties of the membranes were obtained before and after the swelling experiments, and their relaxation spectra were characterized with the Fuoss-Kirkwood equation and analyzed in terms of the free volume parameter. It was found that the ethyl acetate possesses high affinity with the composite membranes and that the absorption of these small molecules substantially modifies the viscoelastic behavior and structure of the active layer. The combination of swelling experiments and the study of the mechanical relaxations proved to be an appropriate technique to investigate the behavior of pervaporation membranes immersed in different mixtures.
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9.
  • Ahuja, Rajeev, et al. (författare)
  • Electronic and optical properties of lead iodide
  • 2002
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 92:12, s. 7219-7224
  • Tidskriftsartikel (refereegranskat)abstract
    • The electronic properties and the optical absorption of lead iodide (PbI2) have been investigated experimentally by means of optical absorption and spectroscopic ellipsometry, and theoretically by a full-potential linear muffin-tin-orbital method. PbI2 has been recognized as a very promising detector material with a large technological applicability. Its band-gap energy as a function of temperature has also been measured by optical absorption. The temperature dependence has been fitted by two different relations, and a discussion of these fittings is given.
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  • Resultat 1-10 av 14

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