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  • energy distribution  (2)
  • silane-treated silica  (1)
  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Studies of surface modification of solids (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 506-511 
    Details
    ISSN: 1435-1536
    Keywords: Surface modification ; heats of immersion ; silane-treated silica
    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 The surface of silica was treated with trimethylchlorosilane (TMCS) and hexa-methyldisilazane (HMDS) respectively and the immersional heat into water, adsorption capacity for water vapor and infrared absorption spectra were measured. TMCS reacts with freely vibrating silanols while HMDS also reacts with other silanols. By treatment with silane, the silica surface is covered by the trimethylsilyl group, a maximum amount of which attains 1 meq/g (3 groups/nm2). As the amount of the trimethylsilyl group on silica increases, the immersional heat of silica into water decreases and attains a constant value of about 25 erg/cm2, which is the typcial value for a hydrophobic surface. The interaction of the trimethylsilyl group with water is weak, therefore the adsorptive capacity for water vapor is lessened remarkably by treatment with silane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458342
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  • 2
    Electronic Resource
    Electronic Resource
    Estimation of heat of adsorption from energy distribution on heterogeneous surfaces by a theoretical analysis of adsorption process (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 832-837 
    Details
    ISSN: 1435-1536
    Keywords: Heat of adsorption ; energy distribution ; heterogeneous surface
    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 An attempt was made to calculate theq—θ function (experimental heat function) from theε—θ function (energy level function) of a heterogeneous surface. In order to obtain the heat of adsorption, adsorption was assumed to take place on each energy level of theε—θ function. In reversible adsorption, Langmuir's monolayer model was extended to determine the occupation of energy levels by molecules. On this basis, the heat of adsorption could be calculated. Irreversible adsorption was also examined on the basis of chemical kinetics. Molecules were supposed to be held on sites to which they first collided. These calculations were useful for estimating the extent of deviation of theq—θ function from theε—θ function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412961
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  • 3
    Electronic Resource
    Electronic Resource
    Validity of energy distribution derived from heat of adsorption in an ammonia/cation-exchanged Y zeolite system (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 445-448 
    Details
    ISSN: 1435-1536
    Keywords: Heat of adsorption ; energy distribution ; zeolite
    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 The validity ofε-Θ functions (energy level functions) which were derived from experimentalq-Θ functions (heat functions) was examined in an ammonia/cation-exchanged Y zeolite system. Theε-Θ functions of Na-Y zeolite and Cs-Na-Y zeolite were respectively calculated from theirq- Θ functions measured by ammonia adsorption at 373 K. The heat of adsorption of ammonia was also measured on a mixture of these two zeolites at a certain mixing ratio at 373 K. Theε-Θ function of the mixture was likewise calculated on the basis of this measurement. Theε-Θ function thus calculated was in good agreement with the synthesizedε-Θ function derived by linearly combining twoε-Θ functions of each zeolite mentioned above. Theε-Θ function derived from experimentalε-Θ function thus proved to be valid in an actual adsorption system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419549
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