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  • spinodal decomposition  (2)
  • Ovalbumin  (1)
  • viscoelasticity  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    In situ observation of phase separation processes in gelling alkoxy-derived silica system by light scattering method (1994)
    Springer
    Journal of sol gel science and technology 3 (1994), S. 169-188 
    Details
    ISSN: 1573-4846
    Keywords: porous silica gel ; light scattering ; phase separation ; spinodal decomposition ; Cahn's theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The investigation of phase separation processes induced by polymerization reactions of tetramethoxysilane (TMOS) was attempted by a time-resolved light scattering method for TMOS-formamide-water system under the acid-catalyzed condition. Since the early stage of the phase separation exhibits very fast kinetics and weak scattering intensity, the experimental set-up was designed so as to reduce the experimental error and to obtain higher time resolution by using a laser beam expander. For the gels whose morphologies are ‘interconnected structure’ and ‘aggregates of particles,’ it was experimentally found that the wavelength of the concentration fluctuation in the early stage of phase separation was time-independent and its amplitude grew exponentially with time. This suggests that these samples phase-separate by spinodal decomposition mechanism. In the later stages of phase separation, the coarsening process and the following structure-freezing process by gel-network formation were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486556
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  • 2
    Electronic Resource
    Electronic Resource
    Phase separation kinetics in silica sol-gel system containing polyethylene oxide. I. Initial stage (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 227-231 
    Details
    ISSN: 1573-4846
    Keywords: silica ; poly(ethylene oxide) ; light scattering ; spinodal decomposition ; initial stage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Domain formation kinetics in gelling alkoxy-derived silica solutions containing polyethylene oxide (PEO) has been investigated. The time-resolved light scattering measurement was performed for the polymerizing solutions which underwent phase separation in the length scale of micrometer. Domain formation processes which resulted in various sizes of inter-connected morphology were examined, focusing mainly on the initial stage. For all the samples, the scattering intensity grew exponentially with time forming a single peak at a fixed wave-number in the first few tens seconds, which is the characteristic of the linearized regime of the spinodal decomposition. An analysis based on the linearized theory proposed by Cahn gave a reasonable description of the kinetic parameter of phase separation induced in various stages of the sol-gel transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486246
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and dynamics of ovalbumin gels (1997)
    Springer
    Rheologica acta 36 (1997), S. 252-261 
    Details
    ISSN: 1435-1528
    Keywords: Ovalbumin ; gelation ; viscoelasticity ; SEM ; thermal behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Solvent effects on dynamical and thermal behaviors of ovalbumin (OVA) gels induced by thermal denaturation at high temperature of 160°C were studied from dynamic shear modulus measurement, shear creep and creep recovery measurement, and DSC measurement. Two organic solvents, glycerin (G) and ethylene glycol (EG), and their mixtures with water (W)(G/W and EG/W) were used as solvent for preparation of gels. Stable gels formed in pure glycerin took a fractal structure at OVA concentration C range of 15–45wt% at a temperature specific to respective C, whereas a fractal structure was not observed for gels prepared in EG, G/W, and EG/W. The results were consistent with thermal denaturation behaviors of OVA in these solvents. Morphologies of two gels prepared in water and glycerin were explored using high resolution SEM, which showed that a basic unit responsible for formation of OVA gels was spheres with a diameter ranging from 20 to 40 nm, being much larger than 5.6 nm of the diameter of native OVA, and a fractal structure was related to network formation accompanied by melting of those spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366666
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