Abstract
The critical phenomenon of nonaqueous microemulsion was studied for the first time. The coexistence curves of ( T , n ), ( T , ϕ ), and ( T , ψ ) ( n and ϕ are refractive index and volume fraction, respectively; ψ is defined as ψ = ϕ / [ ϕ + ϕ c ( 1 − ϕ ) / ( 1 − ϕ c ) ] ) for a ternary microemulsion [ ϕ (AOT–DMA) + ( 1 − ϕ ) decane] at constant pressure and a constant molar ratio ( ω = 2.86 ) of DMA to AOT have been determined within about 7 K from the critical temperature T c by measurements of refractive index. The critical exponent β has been deduced from ( T , n ), ( T , ϕ ), and ( T , ψ ) coexistence curves within 1 K below T c . They all were 0.329 ± 0.005 and were consistent with the 3D Ising value. The experimental results in a temperature range of ( T c − T ) < 7 K also have been analyzed to obtain critical amplitudes and the Wegner correction terms, to examine the diameters of the coexistence curves.
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