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  • 1995-1999  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Slowing Down of the Diffusion Process in Polystyrene/Cyclohexane Mixtures Approaching the Coexistence Curve and the Critical Point (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 1003-1007 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00108a030
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusivity in a non-ionic surfactant/water mixture of critical composition (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 414-418 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of measurements of the temperature dependence of the mutual diffusion coefficient D of a tetraethyleneglycoloctylether (abbreviated C8E4) /water mixture of critical composition are reported (lower critical point, visually determined critical temperature Tc(vis)=40.587 °C; critical composition, mass fraction yc(C8E4)=0.071). The critical micelle concentration of C8E4 is smaller than the critical concentration, so that micelles are expected to be present in the mixture of critical composition. The reduced diffusion coefficients D*(=6πηξ/(kBT)⋅D) calculated from static and dynamic light scattering and viscosity data scale when plotted as function of the scaling variable x (=qξ) (η, shear viscosity; ξ, correlation length; D, diffusion coefficient; q, absolute value of scattering vector; kB, Boltzmann constant; T, temperature). They can be represented by the approximant of the dynamic scaling function proposed by Burstyn et al. [Phys. Rev. A 28, 1567 (1983)] assuming that the measured diffusion coefficient can be identified with the singular contribution (i.e., D=Dc). The influence of micelles on the critical properties of the system does not show up in the D* versus x plot. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469417
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Slowing down of the kinetics of liquid/liquid phase separation along the binodal curve of a binary liquid mixture with a miscibility gap approaching the critical point (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 8985-8992 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A homogeneous mixture of iso-butoxyethanol/water of noncritical composition is brought from a state in the thermodynamic stable region of its phase diagram in the vicinity of its lower critical point to a metastable state close to the binodal curve by a fast pressure jump. It reaches its thermodynamic equilibrium state by separating into two coexisting liquid phases of different compositions. The emerging second liquid phase is formed by nucleation and growth of droplets. After a short transition time, the early stages of the diffusion limited growth of the droplets of the emerging second liquid phase are studied by light scattering (Mie scattering). The experiments are carried out as function of the temperature difference (Tp−Tc) along the two branches of the liquid/liquid coexistence curve (Tc, critical temperature; Tp, temperature of phase separation). The mutual diffusion coefficient D extracted from the kinetics of the droplet growth decreases approaching the critical point along the two branches of the binodal curve. The values of D obtained in this way are in good agreement with those characterizing the dynamics of concentration fluctuations in each of the coexisting phases in thermodynamic equilibrium monitored by dynamic light scattering experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470088
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  • 4
    Electronic Resource
    Electronic Resource
    Adsorption on hydrophobic porous glass near the liquid/liquid coexistence curve of a binary liquid mixture (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 732-737 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A differential refractometric method is used to study the temperature and composition dependence of the adsorptive properties of porous glass in 2-butoxyethanol (abbreviated C4E1)/water mixtures. The surface of the adsorbent carries hydrophobic -SiO-C8H17 as well as hydrophilic -SiOH groups. The experiments are carried out close to the liquid/liquid coexistence curve in the vicinity of the lower critical point of the system. Depending on the temperature and composition of the mixtures either C4E1 or water is preferentially adsorbed. There exists a line along which the net adsorption vanishes. For compositions x〉xc (x, mole fraction of C4E1; xc, critical composition) the amount of substance of adsorbed water ñ ws(Tp) per unit gram of adsorbent at temperature Tp increases with increasing values of the temperature difference (Tp−Tc) in the range 0 K〈(Tp−Tc)〈4 K. Tp is the temperature of phase separation of the bulk mixture in the presence of the adsorbent. Beginning at temperatures (Tp−Tc)〉4 K the adsorbed amount of substance ñ ws(Tp) decreases. At (Tp−Tc)〉8 K it reaches a value which is smaller by a factor of about 10 compared with its maximum value. This phenomenon is reminiscent of a wetting transition. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473409
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  • 5
    Electronic Resource
    Electronic Resource
    Preferential adsorption on porous glass near the liquid/liquid coexistence curve of a binary liquid mixture (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 2527-2532 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A differential refractometric method is used to study the temperature and composition dependence of preferential adsorption of water on the surface of pore-controlled glass out of 2-butoxyethanol (abbreviated C4E1)/water mixtures. The experiments are carried out close to the liquid/liquid coexistence curve in the vicinity of the lower critical point of the system. When the temperature of phase separation Tp of the mixture is approached at (almost) constant bulk composition from temperatures below Tp the amount of substance of adsorbed water ñsw per unit mass of adsorbent extrapolated to Tp increases along the liquid/liquid coexistence curve with increasing values of x° (x°, mole fraction of C4E1 of the mixtures before adding the absorbent). In experiments with mixtures of composition x°(approximately-greater-than)xc the quantity ñsw is about 10 times larger than that found in experiments with mixtures of compositions x°〈xc (xc, critical composition). The data are interpreted by presuming that the extent of the preferential adsorption of water and its temperature and composition dependence is primarily caused by the presence of −SiOH and −SiO− groups at the hydrophilic surface of the adsorbent [and H+(aq) counter ions] in combination with concentration fluctuations occurring in a wide range of temperatures and compositions along the binodal curve. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472041
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    Paper (German National Licenses)
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