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  • 1
    Electronic Resource
    Electronic Resource
    Nano-Order Structural Analysis of White Light-Emitting Silicon Oxide Prepared by Successive Thermal Carbonization/Oxidation of the Porous Silicon (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1127-1130 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Recently the present authors’ group found that porous silicon showed strong and stablewhite/white-blue light emission after successive thermal carbonization and oxidation by water vapor.This material can be considered as a price-competitive solid-state white-light source. We examinedthese layers by electron energy-loss spectroscopy (EELS), energy-filtering transmission electronmicroscopy (EFTEM). The EEL spectra indicated that the silicon skeleton in the porous layer wascompletely oxidized by the thermal treatment in wet argon ambient and multi-types of carbon phaseswere present in the 1073 K oxidized sample of stronger emission, while carbon complexes includingSi and/or O were formed in the 1223 K oxidized sample of weaker light emission. EF-TEM imagesshowed that carbon/oxygen were more uniformly distributed in the 1223 K oxidized sample. It isassumed that the strong light-emitting properties are controlled by the size and internal chemicalbonding states of carbon clusters incorporated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1127.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Carbonization of Porous Silicon for 3C-SiC Growth (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 556-557 (Sept. 2007), p. 167-170 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present work, the carbonization of porous silicon for the subsequent 3C-SiCgrowth has been systematically studied. The effect of temperature and acetylene flow-rate on thechemical state of the surface and structure relaxation was studied. It was found that the porousnano-crystalline morphology is unstable and tends to recrystallize in temperature range typical of3C-SiC growth on Si (10000C-13000C). The carbonization impedes recrystallization at 10000C, butat 13000C the full recrystallization takes place. Pyrolytic amorphous graphite-like carbon was foundon porous silicon carbonized at temperature and with acetylene flow-rate above critical values
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.556-557.167.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Real Time Detection of Photoreactivity in Pharmaceutical Solids and Solutions with Isothermal Microcalorimetry (1999)
    Springer
    Pharmaceutical research 16 (1999), S. 368-373 
    Details
    ISSN: 1573-904X
    Keywords: photoreactivity ; photochemistry ; isothermal microcalorimetry ; nifedipine ; ascorbic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. In this study an irradiation cell made as an accessory for an isothermal microcalorimeter is introduced, and its suitability for detection photoreactivity in pharmaceutical solutions and solids is demonstrated. The pharmaceuticals employed are chosen as sample materials to evaluate the usefulness and stability of the irradiation cell. Methods. An irradiation cell has been constructed and tested in an isothermal microcalorimeter with pharmaceutical solutions and solids known to be sensitive to daylight or UV light. Light is produced with an Xe-arc lamp, split into two parts and introduced into calorimetric vessels with optical light cables. One of the vessels containing the reference sample gives the response to the heat absorbed by the material (radiant power), and the other vessel containing the sample material gives the response also to the photoreaction. The two irradiation cells are positioned in the sample sides of two separate twin microcalorimetric units. Results. Nifedipine and L-ascorbic acid were found to be photosensitive in solutions and solid states, the extent of the degradation depending on the irradiation intensity and wavelength. The threshold values of the wavelength for the photoreactions, as well as the wavelengths for the maximum reaction rates, were estimated via the scanning irradiation measurements. The ability of photons with different energies to produce heat in the photosensitive reaction of nifedipine was calculated using constant λ measurements. Conclusions. The technique introduced offers a rapid and versatile method to study the photosensitivity of materials in any state. In the measurements, various conditions can be simulated and thus provide information on the real behavior of materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018865400593
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  • 4
    Electronic Resource
    Electronic Resource
    Raman Light Scattering in System of Oriented Wires in Porous Silicon (2000)
    Springer
    Journal of porous materials 7 (2000), S. 275-278 
    Details
    ISSN: 1573-4854
    Keywords: porous silicon ; Raman spectroscopy ; morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Raman-light scattering in porous silicon samples with oriented quantum wires was studied. It was shown, that the experimental data depends on the type of organization of wire system. The explanation of observed effect is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009632114501
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