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  • 1
    Electronic Resource
    Electronic Resource
    Static and dynamic light-scattering of colloidal gases, liquids and crystals (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 93-104 
    Details
    ISSN: 1435-1536
    Keywords: Dynamic light-scattering ; static light-scattering ; colloidal crystals ; electrical double layer ; silica spheres
    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 Static and dynamic light-scattering measurements are made for colloidal-crystals,-liquids and-gases of silica spheres, 103 nm in diameter, in the exhaustively deionized suspension and in the presence of sodium chloride. Sharp peaks in the scattering curve are observed, for the first time, for the colloidal crystals in very diluted aqueous suspension. The product of the effective diffusion coefficient and the scattered light intensity is found constant over the whole range of the scattering angle measured for the colloidal crystals and liquids. Three and two dynamic processes have been extracted separately from time profiles of autocorrelation function of colloidal crystals and liquids, respectively from Marquadt histogram analysis. Decay curves of colloidal gases are characterized by a single translational diffusion coefficient,D 0.D 0 of the gases is always lower than the calculation from the Stokes-Einstein equation with the true diameter of spheres, and increases as ionic concentration increases. These experimental results emphasize the important role of the expanded electrical double layers on the diffusive properties in the colloidal crystals, liquids and gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663441
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Colloidal single crystals of silica spheres in the presence of simple- and poly-electrolytes, and ionic detergents (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 73-80 
    Details
    ISSN: 1435-1536
    Keywords: Colloidal crystals ; silica spheres ; electrical double layer ; single crystals
    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 Colloidal single crystals of silica spheres (103 nm in diameter) are formed in the presence of various kinds of salts 1 simple electrolytes, i.e., sodium chloride, calcium chloride and lanthanum chloride, 2 polyelectrolytes such as 3–6 type ionen polymer (polybrene), poly-N-ethylpyridinium bromide, a copolymer ofN-benzyl pyridinium chloride andN-hexadecyl pyridinium bromide, and sodium polyethylene sulfonate, and 3 cationic and anionic detergents, hexadecyltrimethylammonium bromide and sodium dodecylsulfate. Shape and size of their single crystals, phase diagram, and the relationship between the two parameters among the critical concentration of melting, conductance and pH of the crystal-like suspensions have been studied. Colloidal single crystals ofpositively charged spheres have been formed in this study by the method of the charge reversal of spheres through the strong adsorption of cationic polyelectrolytes onto the anionic silica spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658912
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation of EEG, neuroimaging and histopathology in an epilepsy patient with diffuse cortical dysplasia (2000)
    Springer
    Child's nervous system 16 (2000), S. 75-79 
    Details
    ISSN: 1433-0350
    Keywords: Key words Cortical dysplasia ; Electrocorticogram ; Neuroimaging ; Histology ; Epileptogenic zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The correlation between scalp EEG, intraoperative electrocorticogram, neuroimaging and histopathology was examined in an epileptic child with diffuse cortical dysplasia. The 6-year-old girl with moderate mental retardation had suffered from intractable complex partial and generalized epilepsies since the age of 2 years. MR images demonstrated unilateral large macrogyria/polymicrogyria and schizencephaly in the right occipital lobe. The epileptic focus was detected on the macrogyria by EEG and single photon emission tomography. However, the intraoperative electrocorticogram showed frequent spikes from the polymicrogyria and no paroxysmal activity in the macrogyria. The polymicrogyria and the macrogyric lesion were resected, using an image-guided system. The histological findings revealed that the macrogyria was covered with and separated by glial bundles. It has been reported that epileptogenicity is produced from abnormal neurons and their arrangement in cortical dysplasia; in this case, however, the major dysplastic lesion had no epileptogenicity; rather the focus might be in the polymicrogyria around the lesion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00007283
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    Paper (German National Licenses)
    Fulltext
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