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  • Membrane  (1)
  • critical phenomena  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Modification of electrochemical properties of pore wall of track-etched mica membranes (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 159-166 
    Details
    ISSN: 1435-1536
    Keywords: Membrane ; mica ; pores ; transport properties
    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 electrochemical properties of the pore wall of track-etched mica membranes are modified (a) by covalent binding of positively and negatively charged groups, and (b) by adsorption of cationic and amonic polyelectrolytes. The electrochemical properties of the pore wall are characterized by measurements of membrane potential, electrical conductivity and streaming potential. By these methods it is possible to change the sign of the surface charge density of the pore wall and to increase its absolute value by a factor of about 30 compared with that of the unmodified pore wall. Changes of electrochemical properties of the pore wall are desirable in studies of negative osmosis and incongruent electrolyte transport in membranes with known pore structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414843
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Viscosity and diffusivity of a binary liquid mixture of critical composition: Study of the system 2-butoxyethanol/water (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 67-94 
    Details
    ISSN: 1572-9567
    Keywords: critical phenomena ; shear viscosity ; diffusivity ; dynamic scaling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of measurements of the temperature dependence of the shear viscosity and the mutual diffusion coefficient of a 2-butoxyethanol/water mixture of critical composition are reported. The shear viscosities are measured with a capillary viscometer, and the diffusion coefficients by dynamic light scattering. The viscosity data are used to determine the regular (background) and the singular (critical) part of the viscosity $$[\eta _b ;\eta = \eta _b (Q_0 \xi )^{z_\eta } ]$$ and to analyze the crossover regime.Q 0 has a value ofQ o = (1.54 ± 0.60) × 106 cm−1, which is small for a binary mixture of components of small molar mass. The viscosity is dominated by singular contributions in a narrow temperature range (T c − T) ≤ 1.2 K. The singular contributions can be neglected for temperatures (Tc−T) ≥ 11 K. The function η=ηb expz η H, given in the literature, represents the viscosity data in the temperature range 3 mK ≤ (T c − T) ≤ 25 K using the asymptotic form of the functionH for (q d/q c) → 0 (q d,q c, parameter of the theory). This limit corresponds to the case in which the background diffusion coefficient Lib can be neglected. The reduced diffusion coefficient D* calculated from the light-scattering data as a function of the scaling variable x(=qζ) is represented by the approximation of the dynamic scaling function proposed in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439247
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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