Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10378021 | Journal of Colloid and Interface Science | 2005 | 5 Pages |
Abstract
The critical phenomenon of nonaqueous microemulsion was studied for the first time. The coexistence curves of (T,n), (T,Ï), and (T,Ï) (n and Ï are refractive index and volume fraction, respectively; Ï is defined as Ï=Ï/[Ï+Ïc(1âÏ)/(1âÏc)]) for a ternary microemulsion [Ï (AOT-DMA)+(1âÏ) decane] at constant pressure and a constant molar ratio (Ï=2.86) of DMA to AOT have been determined within about 7 K from the critical temperature Tc by measurements of refractive index. The critical exponent β has been deduced from (T,n), (T,Ï), and (T,Ï) coexistence curves within 1 K below Tc. They all were 0.329±0.005 and were consistent with the 3D Ising value. The experimental results in a temperature range of (TcâT)<7K also have been analyzed to obtain critical amplitudes and the Wegner correction terms, to examine the diameters of the coexistence curves.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
S. Peng, X. An, W. Shen,