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I4-61: BINARY PHASE TRANSITION - CRITICAL OPALESCE 7 years 10 months ago #1327

  • zzfixk21
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ID Code: I4-61
Purpose: Show the behavior of a binary fluid as it passes through the critical temperature.
Description: A small sealed vial contains the correct mixture of aniline and cyclohexane to form a binary fluid when heated above its critical point, about 95 degrees Fahrenheit. The fluid is heated by hand or using a beaker of warm water. Then the vial is placed in the laser beam. When the fluid cools down to its critical point it breaks into cells, becoming cloudy, and scatters the laser beam chaotically. This is very dramatic because it happens very quickly.

The photographs above show the scattering of the laser beam by the fluid above the critical point (left), at the critical point, when the cells are beginning to form (center), and well below the critical point, when the fluid is a cloudy mixture of the two individual fluids (right)

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