ISSN:
1572-9567
Keywords:
liquid–liquid equilibria
;
critical state
;
experimental method
;
turbidity
;
methanol
;
cyclohexane
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A ground based (1g) experiment is in progress that measures the turbidity of the density-matched, binary fluid mixture methanol–cyclohexane extremely close to its liquid–liquid critical point. By covering the range of reduced temperatures t ≡ (T−T c)/T c from 10−8 to 10−2, the turbidity measurements should allow the Green–Fisher critical exponent η to be determined. This paper reports measurements showing ±0.1 % precision of the transmitted and reference intensities, and ±4μK temperature control near the critical temperature of 320 K. Preliminary turbidity data show a nonzero η consistent with theoretical predictions. No experiment has precisely determined a value of the critical exponent η, yet its value is significant to theorists in critical phenomena. Relatively simple critical phenomena, as in the liquid–liquid system studied here, serve as model systems for more complex behavior near a critical point.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1022687219993
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