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  • COMPUTERS  (1)
  • CdSe nanocrystals  (1)
  • Geophysics  (1)
  • II–VI crystal growth  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of Cd content and Se doping on the formation of CdSe nanocrystals in silica xerogels: A SAXS study (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 285-291 
    Details
    ISSN: 1573-4846
    Keywords: CdSe nanocrystals ; silica xerogels ; sonogels ; SAXS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Small-angle X-ray scattering (SAXS) experiments were carried out to characterize the structure of the composite formed by CdSe nanocrystals embedded in a popous silica matrix (silica xerogels containing Cd with formamide addition and ultrasound treatment). SAXS results from samples before Se diffusion indicate the presence of heterogeneities with a bimodal size distribution which was associated to the existence of mesopores (pores of several hundred Å) immersed in a nanoporous matrix (characteristic pore radii of 20–30 Å). The diffusion of Se induces the nucleation and growth of CdSe nanocrystals. The average size of the nanocrystals increases with Cd content. Higher Se doses promote the formation of larger nanocrystals (radius of gyration of ∼30 to 50 Å). Anomalous scattering results confirm the existence of Se aggregation associated with CdSe nanocrystal formation and suggest that only partial segregation of Cd and Se occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436853
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    SANS Study of CdS and CdSe Quantum Dot Crystal Growth in a Silica Matrix by Sol-Gel (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 629-633 
    Details
    ISSN: 1573-4846
    Keywords: quantum dots ; II–VI crystal growth ; silica gel ; SANS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Size and size distribution of the semiconductor nanocrystals embedded in a dielectric matrix play a dominant role in line broadening and the exciton quantum confinement level. The results show new aspects of the CdS and CdSe crystal growth as quantum dots using small angle neutron scattering techniques (SANS). Thus, the crystal growth influences the aggregation process of the silica network. The intensity difference of the scattering between the silica matrix and the composite accounts for the crystal size and their volume fraction. Under similar conditions CdS nanocrystals grow faster and bigger than CdSe ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008611814985
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  • 3
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    Ionospheric convection during different phases of magnetospheric substorms (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Observations of ionospheric convection flows at a range of local times during the various phases of the substorm cycle are reported on with the aim of investigating the convection behavior during a range of times and phases. The ionospheric flow observations are from the EISCAT and DMSP satellites. The substorm phases are identified from energetic particle measurements from geosynchronous satellites. The growth phase convection indicates an initial expansion of the polar cap. There is an unexplained poleward motion of the flow reversal boundary (FRB). It is concluded that this motion does not necessarily provide a true representation of the balance between reconnection at the dayside and in the tail. The expansion phase flows do not show any evidence for tail reconnection until late in the phase. The convection during the recovery phase is indicative of tail reconnection as there is evidence that there is only a lobe cell driving convection on the dayside.
    Keywords: Geophysics
    Type: ; 103-108
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Wind Tunnel Testing of Antenna Models (1964)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Supersonic wind tunnel testing of antennas
    Keywords: COMPUTERS
    Type: Annals of the New York Academy of Sciences. Large Steerable Radio Antennas-Climatological and Aerodynamcis Considerations; 116; Art 1; 239-274
    Format: text
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    NASA TECHNICAL REPORTS
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