ULTRASONIC-ABSORPTION STUDIES OF SURFACTANT EXCHANGE BETWEEN MICELLES AND BULK PHASE IN AQUEOUS MICELLAR SOLUTIONS OF NONIONIC SURFACTANTS WITH SHORT ALKYL CHAINS .1. 1,2-HEXANEDIOL AND 1,2,3-OCTANETRIOL
Frindi, M; Michels, B; Zana, R
| HERO ID | 4683977 |
|---|---|
| In Press | No |
| Year | 1991 |
| Title | ULTRASONIC-ABSORPTION STUDIES OF SURFACTANT EXCHANGE BETWEEN MICELLES AND BULK PHASE IN AQUEOUS MICELLAR SOLUTIONS OF NONIONIC SURFACTANTS WITH SHORT ALKYL CHAINS .1. 1,2-HEXANEDIOL AND 1,2,3-OCTANETRIOL |
| Authors | Frindi, M; Michels, B; Zana, R |
| Journal | Journal of Physical Chemistry |
| Volume | 95 |
| Issue | 12 |
| Page Numbers | 4832-4837 |
| Abstract | 1,2-Hexanediol (1,2-HD) and 1,2,3-octanetriol (1,2,3-OT) are known to self-associate in a manner very similar to that of conventional surfactants to give rise to micellelike aggregates (Hajii, S.; et al. J. Phys. Chem. 1989, 93, 4819). This paper reports on fluorescence probing, with pyrene as a probe, of these aggregates and on a study of the kinetics of monomer exchange between aggregates and bulk phase by means of the ultrasonic relaxation method in the frequency range 0.5-100 MHz. Thus the polarity sensed by pyrene solubilized in the aggregates is lower than for conventional nonionic surfactants of the C(n)E(m) type. The critical micellization concentrations determined by fluorescence probing are in agreement with the reported values. The ultrasonic relaxation amplitude A and frequency f(R) have been found to vary with concentration as expected from the expressions derived for conventional surfactants on the basis of the Aniansson and Wall treatment for the kinetics of surfactant exchange. The full use of these expressions permitted us to obtain the values of the rate constants kappa+ kappa-for the incorporation of a surfactant monomer into, and the dissociation of a monomer from, a micelle, respectively, as well as the standard deviation characterizing the distribution of micelle aggregation numbers (polydispersity) and the volume change upon incorporation. These results are discussed and compared to those obtained for conventional surfactants. |
| Doi | 10.1021/j100165a044 |
| Wosid | WOS:A1991FR75600044 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Scopus URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-0009686007&doi=10.1021%2fj100165a044&partnerID=40&md5=0a8f934d50dbbb5833b02111d1c57a30 |
| Is Public | Yes |
| Language Text | English |