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Citation: CAI Hong-Lan, AN Xue-Qin, SHEN Wei-Guo. Critical Phenomena of Three-component Nonaqueous Microemulsion Systemof DMA+AOT+n-octane[J]. Acta Physico-Chimica Sinica, ;2007, 23(06): 921-925. doi: 10.3866/PKU.WHXB20070624 shu

Critical Phenomena of Three-component Nonaqueous Microemulsion Systemof DMA+AOT+n-octane

1.

College of Chemistry&Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China; College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097, P. R. China; Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China

Received Date: 19 December 2006
Available Online: 28 April 2007

The coexistence curves of (T-n) (T and n are temperature and refractive index, respectively) for the system of DMA+AOT+n-octane have been determined within about 7 K from the critical temperature (Tc) by measurements of refractive index at a constantmolar ratio of DMAto AOT (3.46). The coexistence curves of (T-n) have been converted to the coexistence curves of (T-φ) and (T-ψ) (φand ψare volume fraction and effective volume fraction, respectively) through the standard curves determined by measurements of refractive indexes at various volume fractions and temperatures. The critical exponent β was deduced from the coexistence curves, which was found to be inconsistent with the 3D-Ising value and approach the Fisher-normalization value 0.365 in a rather wide temperature range. The experimental results were also analyzed to obtain the critical amplitude B and the Wegner correction terms B1 to examine the diameters of coexistence curves, and to discuss the odness of the order parameter.
- Microemulsion; Critical phenomena; Coexistence curve; Refractive index; AOT
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