Abstract
A relatively simple experiment has been designed to allow advanced undergraduates to investigate light scattering phenomena above the critical consolute point in a binary fluid mixture: methanol–cyclohexane. A He–Ne laser beam penetrates a fluid mixture sealed in a cylindrical aluminum cell while a dc Wheatstone bridge allows the cell temperature to be controlled to 0.01 °K. Transmitted light intensity measurements taken from 0.1 to 10 °K above the critical consolute point allow the turbidity to be calculated. The critical exponent gamma γ, is determined using a modified Ornstein–Zernike theory.
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