Study on the micelle formation of surfactants in aqueous solutions under high pressure by laser light-scattering technique. Part 2
The pressure dependence of the micellar aggregation numbers of penta-, hepta-, and octaoxyethylene dodecyl ethers (abbreviated respectively as C/sub 12/E/sub 5/, C/sub 12/E/sub 7/, and C/sub 12/E/sub 6/) was determined by the laser light-scattering technique, in aqueous solutions at 298.15 K. Next, the critical micellization concentration (CMC) was calculated under pressure for each surfactant, including hexaoxyethylene dodecyl ether (C/sub 12/E/sub 8/), from the aggregation number vs. pressure, by utilizing Tanford's expressions and assuming the micellar shape as disk-like (oblate ellipsoid) for each micelle. From the obtained pressure dependence of the CMC, the standard volume changes on micellization were calculated for polyoxyethylene-type nonionic surfactants, C/sub 12/E/sub n/ (n = 5 to 8). The contribution of oxyethylene (oe) groups is discussed. 45 references.
- OSTI ID:
- 5503421
- Journal Information:
- J. Colloid Interface Sci.; (United States), Vol. 82:2
- Country of Publication:
- United States
- Language:
- English
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