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Viscosity and diffusivity of a binary liquid mixture of critical composition: Study of the system 2-butoxyethanol/water (1994)

Zielesny, A. ; Schmitz, J. ; Limberg, S. ; [weitere]

Springer

International journal of thermophysics 15 (1994), S. 67-94

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ISSN: 1572-9567

Schlagwort(e): critical phenomena ; shear viscosity ; diffusivity ; dynamic scaling

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01439247

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Digitale Medien

Viscosity of critical mixtures (1963)

Debye, P. ; Chu, B. ; Woermann, D.

New York : Wiley-Blackwell

Journal of Polymer Science Part A: General Papers 1 (1963), S. 249-254

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ISSN: 0449-2951

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Measurements of the viscosity of critical mixtures were extended to high polymer solutions (polystyrene-cyclohexane). An anomaly is found in the temperature coefficient of the viscosity. An empirical expression for the viscosities of critical mixtures as a function of ΔT/Tc, where ΔT = T - Tc, and Tc is the critical temperature, is derived.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1963.100010121

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Digitale Medien

Critical opalescence of polystyrene in ethylcyclohexane (1963)

Debye, P. ; Woermann, D. ; Chu, B.

New York : Wiley-Blackwell

Journal of Polymer Science Part A: General Papers 1 (1963), S. 255-259

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ISSN: 0449-2951

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: The range of molecular forces and the critical temperature of polystyrene in ethylcyclohexane are calculated from measurements of the angular dependence of critical opalescence. The polystyrene samples have molecular weights ranging from 69,000 to 552,000. The range of molecular forces remains strikingly small and is comparable with values obtained earlier on the system polystyrene-cyclohexane.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1963.100010122

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