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  • ZSM-5  (3)
  • 81.15  (2)
  • Springer  (5)
  • 1990-1994  (5)
  • 1965-1969
Collection
Keywords
Publisher
  • Springer  (5)
Years
  • 1990-1994  (5)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Aromatisation ofn-heptane over ZSM-5 prepared without the aid of a template (1994)
    Springer
    Catalysis letters 28 (1994), S. 231-239 
    Details
    ISSN: 1572-879X
    Keywords: n-heptane aromatisation ; ZSM-5 ; non-templated
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract ZSM-5 was prepared without the aid of an organic template. Effect of synthesis parameters on its catalytic activity in aromatisation ofn-heptane are discussed. Addition of seed material increased the crystallinity of the ZSM-5 phase. The catalytic activity was comparable with a sample prepared using an organic template. Formation of higher amount of C9– aromatics was observed over the non-templated zeolite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806052
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  • 2
    Electronic Resource
    Electronic Resource
    Epitaxial growth of lattice mismatched SrF2 films on (100) GaAs (1992)
    Springer
    Applied physics 54 (1992), S. 284-287 
    Details
    ISSN: 1432-0630
    Keywords: 81.10 ; 81.15 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract For the first time insulating epitaxial SrF2 films on (100) GaAs substrates have been grown by thermal deposition followed by in situ annealing process. Structural properties of SrF2 films examined by X-ray diffraction, scanning electron microscopy and transmission electron microscopy indicate a very good crystalline quality. It is observed from the X-ray analysis that SrF2 layers thinner than 100 nm suffer two dimensional compressive stress due to the lattice misfit while those thicker than 100 nm suffer two dimensional tensile stress due to the difference in the thermal expansion coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323851
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical properties of polyimide on n-GaAs (100) interfaces by a pulsed laser evaporation technique (1993)
    Springer
    Applied physics 56 (1993), S. 353-354 
    Details
    ISSN: 1432-0630
    Keywords: 73.40 ; 81.10 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Incorporation of a thin insulating layer of polymer-like polyimide deposited by pulsed laser evaporation technique between metal and n-GaAs has resulted in diode structures with MIS and Schottky-barrier-type capacitance-voltage and current-voltage characteristics. These structures have the potential to be useful in improving the performance of GaAs FETs for microwave and high-speed applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324355
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of template on crystallization of ZSM-5 zeolites (1990)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 9 (1990), S. 91-99 
    Details
    ISSN: 1573-1111
    Keywords: Zeolite ; ZSM-5 ; synthesis ; crystallization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pentasil zeolites of ZSM-5 type are synthesised hydrothermally using triethyl-n-proplyammonium bromide (TEPA-Br) and triethyl-n-butylammonium bromide (TEBA-Br). The crystallization kinetics, followed by XRD, SEM and thermal analysis, clearly demonstrate the influence of size and molecular weight of the templating quaternary ammonium cation (QAC) species on the rates of nucleation and crystallization. The values of the apparent activation energies for nucleation and crystal growth indicate that both nucleation and crystal growth are faster when TEPA-Br rather than TEBA-Br is used as a template. The quantitative identification of intergrown phases characterizes both the phases to be ZSM-5 zeolite. Thermoanalytical curves for both these zeolites in as-synthesised forms exhibit two-step oxidative decomposition of the occluded organic species. This suggests that the quaternary ammonium cation may be located at two energetically different sites within the zeolite channels. The equilibrium sorption capacity, however, is found to increase in the order of size and molecular weight of the templating species in both the zeolites. The nature of acid site distribution, obtained from the temperature programmed desorption of ammonia is found to be independent of the templating species used during the synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041253
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallisation of zeolite mordenite and ZSM-5 without the aid of a template (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 13 (1992), S. 171-179 
    Details
    ISSN: 1573-1111
    Keywords: Zeolite synthesis ; small port mordenite ; ZSM-5 ; IR ; XRD ; sorption properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Zeolites ZSM-5 and mordenite were synthesized without the aid of a template, in the gel composition ofXSiO2 : Al2O3 :YNa2O: 1500 H2O, whereX = 20–40 andY = 3.5–10.0 at 463 K. After 48 h of crystallisation the aluminosilicate gel system yielded either ZSM-5 or mordenite and their mixtures as zeolitic phases in addition to α- quartz depending on the variation in oxide mole composition. Transformation of crystalline ZSM-5 to mordenite was accompanied by a lower yield of solid product as a result of an increase in SiO2/Al2O3 and Na2O/SiO2 ratios in the aluminosilicate gel. At constant Na2O/SiO2 ratio, the decrease in SiO2/Al2O3 in the gel mixture was operative in lowering the product SiO2/Al2O3 ratio. Similarly, at constant SiO2/Al2O3 the increase in Na2O/SiO2 in the gel decreased the product SiO2/Al2O3 ratio. The mordenite obtained was found to be of the small port variety. Crystalline phases obtained were further characterised by XRD, IR, SEM and sorption studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053641
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