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  • ceria  (3)
  • Key words Liquid crystalline polymer  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the Pore Texture of SnO2-CeO2 Composite Oxides (1997)
    Springer
    Journal of sol gel science and technology 9 (1997), S. 41-52 
    Details
    ISSN: 1573-4846
    Keywords: tin(IV) oxide ; ceria ; pore structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Gas adsorption techniques have been used to study the pore texture changes occurring in composite SnO2-CeO2 materials of varying Sn:Ce atom ratios on calcination at temperatures up to 1273 K. The data show that the uncalcined materials are largely microporous in nature, but changes in specific surface area, pore sizes and pore volume occur at an early stage in the calcination process with the formation of mesopores. However, significant changes occur at calcination temperatures 〉673 K at which point the mesopores are substantially reduced, and at 873 K and above the mean pore size increases greatly finally giving non-porous solids after calcination at 1273 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026408306645
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of the pore texture of SnO2-CeO2 composite oxides (1997)
    Springer
    Journal of sol gel science and technology 9 (1997), S. 41-52 
    Details
    ISSN: 1573-4846
    Keywords: tin(IV) oxide ; ceria ; pore structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Gas adsorption techniques have been used to study the pore texture changes occurring in composite SnO2-CeO2 materials of varying Sn: Ce atom ratios on calcination at temperatures up to 1273K. The data show that the uncalcined materials are largely microporous in nature, but changes in specific surface area, pore sizes and pore volume occur at an early stage in the calcination process with the formation of mesopores. However, significant changes occur at calcination temperatures〉673 K at which point the mesopores are substantially reduced, and at 873 K and above the mean pore size increases greatly finally giving non-porous solids after calcination at 1273 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02439335
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of the band texture occurring in hydroxypropylcellulose solutions using rheo-optical, rheological and small angle light scattering techniques (1999)
    Springer
    Rheologica acta 38 (1999), S. 569-593 
    Details
    ISSN: 1435-1528
    Keywords: Key words Liquid crystalline polymer ; Hydroxypropylcellulose ; Band texture ; Rheo-optics ; Rheology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The band texture occurs in lyotropic and thermotropic main-chain polymers after cessation of flow. This paper begins with a review of work concerned with band texture formation following shear and is followed by the presentation of original results obtained during a recent investigation. The evolution of band texture formation in a Klucel EF, 50% hydroxypropylcellulose (HPC) water solution, has been observed using polarized optical microscopy. The relationship determined between the primary shear rate and the rate of evolution of the band texture is complex and three different behaviours have been observed corresponding to three shear rate regions. Both steady flow and dynamic rheological investigations have been conducted on the HPC solution, the results of which have been related to the optical behaviour of the band texture. Data from steady flow investigations suggest that the viscosity of the solution when the band texture is present, decreases following increasing primary shear rates, is shear thinning and increases linearly with the time following its formation. Dynamic investigations suggest a definite link between the band texture evolution and the evolution of both G′ and G′′. In addition, the perfection of the band texture versus the primary shear rate has been quantified by studying the evolution of tan(δ) following the cessation of the primary shear. Dynamic experiments show that the structure of the band texture remains longer than suggested by the optical aspect of the texture. Small angle light scattering patterns have been correlated with the development of the band texture and confirm the continuing presence of the band texture structure following its optical disappearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050209
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  • 4
    Electronic Resource
    Electronic Resource
    Chemical Microengineering in Sol-Gel Derived Fluoride and Lanthanide Modified Ceria Materials (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 1049-1055 
    Details
    ISSN: 1573-4846
    Keywords: ceria ; fluoride doping ; lanthanides ; powder X-ray diffraction ; transmission electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of the incorporation of rare earth cations and fluoride anions into the ceria fluorite lattice has been studied. Ternary Ln-Ce-O (Ln = La, Pr, Nd) oxide gels of target Ln : Ce ratios of 1 : 4, 1 : 1.86 and 1 : 1, with and without added fluoride ion, have been prepared, and the oxide materials obtained after calcination at 1223 K examined. Incorporation of Ln results in the formation of Ln/CeO2 solid solutions at low Ln levels, but a microscopic mixture of two cubic phases, pure ceria and a Ln-Ce-O phase of composition Ce0.35La0.65O1.67, is obtained when a 1 : 1 ratio is employed. With fluoride pure CeO2 and LaF3 are the only phases present and no mixed Ln-Ce-O phase is formed. TEM shows that the microstructure of this material is complex. The nature of analogous Pr- and Nd-substituted ceria materials is also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008676702574
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