Critical Opalescence of a Binary Liquid Mixture, <i>n</i>-Dodecane—β,β′-Dichloroethyl Ether. III. Very Near the Critical Mixing Point

Chu, Benjamin; Kao, W. P.

doi:10.1063/1.1696341

Cited by 18 publications

(9 citation statements)

References 10 publications

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“…In any case, the uncertainties and fluctuations in the data seem to show that q = 0 cannot be excluded for fluid systems. For the nitroethane-3-methyl pentane system, McIntyre and Scngers [57] reported that q = 0.2 0.1 while Ghu and Kao [38] indicated the presence of q for the system n-dodecane-P$'dichlorodiethyl ether, as shown in Fig. 2. I should, however, emphasize three subtle weaknesses of such findings :…”

Section: (2) Estimate On the Critical Exponent Vmentioning

confidence: 98%

“…Multiple scattering is another complication. Experimentally, it is easier to try to alleviate multiple scattering by (1) shortening the optical path length of the light-scattering cell, (2) working at longer wavelength, and (3) choosing weakly opalescent systems [38]. In this respect, small-angle x-ray scattering has a distinct advantage.…”

Section: A Scattered Intensitymentioning

confidence: 99%

“…After the measured scattered intensities have been corrected for scattering volume changes, attenuation, reflection, refraction, and dust [38], the value of y is usually obtained from Equation (19) by means of the least-square method for onecomponent systems. The situation is more complicated for two-(and multi-)component systems.…”

Section: There the Isothermal Compressibility Becomes Very Large Asmentioning

confidence: 99%

“…The incident beam had fairly large dimensions corresponding to beam-heights of 10 mm for the light-scattering photometer of Chu and Kao [38] and about 3 mm for that of M c I n t y r e and Sen ger s [47], respectively. In the very immediate neighborhood of the critical mixing point, the angular dependence of scattered intensity could be smeared over a range of concentrations because of the gravitational effect.…”

Section: Berichtc Der Bunscn-gesellschaftmentioning

confidence: 99%

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Critical Opalescence

Chu

1972

Ber Bunsenges Phys Chem

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Intensity measurements of visible light and x‐rays and linewidth measurements of visible light scattered by one, two, and multicomponent systems for various equilibrium states in the neighborhood of the critical point are reviewed. By combining the angular dependence of the scattered intensity with that of the power spectrum from quasi‐elastic light scattering, one can determine separately the nature of the divergence of equilibrium properties, such as the isothermal compressibility and the osmotic coefficient; the transport coefficients, such as the thermal diffusivity and the diffusion coefficient; and the correlation range. Experimental data will be discussed in terms of the static and dynamic scaling hypothesis.

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Section: (2) Estimate On the Critical Exponent Vmentioning

confidence: 98%

Section: A Scattered Intensitymentioning

confidence: 99%

Section: There the Isothermal Compressibility Becomes Very Large Asmentioning

confidence: 99%

Section: Berichtc Der Bunscn-gesellschaftmentioning

confidence: 99%

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Critical Opalescence

Chu

1972

Ber Bunsenges Phys Chem

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“…Earlier lightscattering intensity data (Chu & Kao, 1965) have often been interpreted in terms of the Fisher approximant…”

Section: X~0mentioning

confidence: 99%

Critical phenomena and polymer coil-to-globule transition

Chu¹,

Xu²,

Wang³

et al. 1988

J Appl Cryst

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Small-angle scattering techniques including laser light scattering (LLS), small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) have been useful tools to measure the static and dynamic properties (in terms of critical fluctuations) of fluids, fluid mixtures, polymer and micellar solutions, polymer blends and metallic alloys. A brief review is given of recent results in critical-phenomena experiments using small-angle scattering techniques. Topics of current interest are pointed out, and a guide to the vast literature on critical opalescence is provided. Coil-toglobule transition in polymer solutions has been a classic experimental challenge over the past decade. In order to succeed in reaching the collapsed regime, it becomes important to realize that single coil contraction of a linear polymer molecule in solution takes place in the neighborhood of phase separations. By using the recent development of a small-angle lightscattering spectrometer and by taking advantage of a successful polymer fractionation experiment, the transition behavior of linear polystyrene in cyclohexane from the 69 state to the collapsed regime can be characterized based on both the radius of gyration and the hydrodynamic radius.

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Critical Phenomena

Chu

1985

Dynamic Light Scattering

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Critical Opalescence of a Binary Liquid Mixture, n-Dodecane—β,β′-Dichloroethyl Ether. III. Very Near the Critical Mixing Point

Cited by 18 publications

References 10 publications

Critical Opalescence

Critical Opalescence

Critical phenomena and polymer coil-to-globule transition

Critical Phenomena

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