Critical Phenomena

Chu, Benjamin

doi:10.1007/978-1-4613-2389-1_7

Dynamic Light Scattering 1985

DOI: 10.1007/978-1-4613-2389-1_7

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Critical Phenomena

Benjamin Chu

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1988

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Cited by 2 publications

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Dynamic Light Scattering of the Fluid‐Fluid Phase Transition in the Vicinity of the Critical Solution Point and in the First Order Transition Region

Schröer

Rybarsch

Strojny

et al. 1988

Ber Bunsenges Phys Chem

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Critical Phenomena / Light. Scattering / Liquids / Phase Transitions / Solutions Measurements of the Rayleigh-Brillouin spectra of the binary system nitroethane-isooctane have been carried out as function of temperature and concentration. The purpose of this investigation was to study the transition of one type of phase transformation to an other. Taking the temperature as variable, the phase transformation is of second order for one specific concentration -the critical concentration, whereas for other concentrations it is of first order. Samples deviating up to 20% from the critical composition have been investigated in the temperature range 10 to 10-3 K above the transition temperature in the homogeneous region. The temperature dependence of the Rayleigh-Brillouin intensity ratio 1,/2/ b can be described by the same critical exponent y = 1.24 for all concentrations provided the critical temperature in the scaling function is replaced by another reference temperature, interpreted as pseudo-spinodal temperature T s *' The concentration dependence of T s* is found to be IX -Xci = A· tt*, where t, is the reduced temperature t, = 1 -Ts*/T c. The value ofthe exponent is found to be P* = 0.5, which is the classical exponent of the spinodal curve.

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Dynamic Light Scattering of the Fluid‐Fluid Phase Transition in the Vicinity of the Critical Solution Point and in the First Order Transition Region

Schröer

Rybarsch

Strojny

et al. 1988

Ber Bunsenges Phys Chem

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Dynamical Lightscattering of Pretransitional Phenomena in Liquid Mixtures

Schröer

Wiegand

Staude

et al. 1991

Ber Bunsenges Phys Chem

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We report measurements of the scattering intensity and of the autocorrelation function of the pseudo binary mixture guaiacol/glycerol‐water as a function of temperature and water content. The guaiacol glycerol ratio was kept constant 1:1, while the mass ratio of water/glycerol varied between 0.4% < x < 1.4%. The system shows a closed solubility loop if x > 1.17%. A phenomenological model for the temperature dependence of the interaction parameter is used in order to describe the scattering intensity and the diffusion coefficient as function of temperature.

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Critical Phenomena

Cited by 2 publications

References 127 publications

Dynamic Light Scattering of the Fluid‐Fluid Phase Transition in the Vicinity of the Critical Solution Point and in the First Order Transition Region

Dynamic Light Scattering of the Fluid‐Fluid Phase Transition in the Vicinity of the Critical Solution Point and in the First Order Transition Region

Dynamical Lightscattering of Pretransitional Phenomena in Liquid Mixtures

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