Technical Note Marangoni instability of a layer of binary liquid in the presence of nonlinear Soret effect

1999 ◽  
Vol 42 (15) ◽  
pp. 3007-3011 ◽  
Author(s):  
S. Slavtchev ◽  
G. Simeonov ◽  
S.Van Vaerenbergh ◽  
J.C. Legros
Keyword(s):  
Soret Effect ◽  
Technical Note ◽  
Marangoni Instability ◽  
Binary Liquid

Thermal Lens Absorption Measurements in Binary Liquid Mixtures near the Consolute Critical Point

1986 ◽  
Vol 40 (5) ◽  
pp. 606-611 ◽  
Author(s):  
F. D. Hardcastle ◽  
J. M. Harris
Keyword(s):  
Critical Point ◽  
Thermal Lens ◽  
Soret Effect ◽  
Pure Water ◽  
Fold Increase ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Water Mixture ◽  
Binary Liquid ◽  
Absorption Measurements

Binary liquid mixtures near their consolute critical points are shown to possess desirable thermophysical properties for thermal lens absorption measurements. By use of a 2,6-dimethylpyridine/water mixture near critical composition and temperature, sensitivity was found to be enhanced relative to pure liquids by the Soret effect in which a concentration gradient is created between the two solvent components by thermally induced mass diffusion within the laser-excited temperature gradient. A 35-fold increase in sensitivity relative to a thermal expansion lens effect in pure water was obtained. A mechanism of phase separation unique to the critical point region known as spinodol decomposition was observed, as the sample temperature was driven above the critical point by laser excitation. This phenomenon was also found to be a potentially useful spectrophotometric technique for the thermooptical detection of small absorbances.

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