Inverted Micellar Systems and Their Relations to Microemulsions

Danielsson, Ingvar; Hakala, Marja-Riitta; Jorpes-Friman, M.

doi:10.1007/978-1-4615-7883-3_7

Cited by 11 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hence, we limit ourselves to comparison of Stokes-Einstein radii. A more detailed calculation of aggregation radii for different shapes is given in reference [35].…”

Section: Dynamic Light Scatteringmentioning

confidence: 99%

Reversed micellar solutions in the system sodium octanoate/decanol/water: Model calculations and dynamic light scattering measurements

Sjöblom¹,

Rosenqvist²,

Stenius³

1982

Colloid & Polymer Sci

View full text Add to dashboard Cite

Geometrical calculations of aggregate sizes in the reversed micellar solution phase of the system water/sodium octanoate/decanol at 20 ~ have been tested by dynamic light scattering studies. The autocorrelation functions were interpreted in the simplest possible way (monodisperse aggregates, Stokes-Einstein diffusion equations) since the geometrical model does not account for detailed changes in shapes or micellar interactions. The model predicts the main features of micellization in these solutions, i. e., the micelles grow continuously as the concentration of water or the molar ratio water/octanoate increases, association begins at quite low concentrations of water and the surrounding decanolic solvent behaves as pure decanol which is saturated with water.

show abstract

“…Hence, we limit ourselves to comparison of Stokes-Einstein radii. A more detailed calculation of aggregation radii for different shapes is given in reference [35].…”

Section: Dynamic Light Scatteringmentioning

confidence: 99%

Reversed micellar solutions in the system sodium octanoate/decanol/water: Model calculations and dynamic light scattering measurements

Sjöblom¹,

Rosenqvist²,

Stenius³

1982

Colloid & Polymer Sci

View full text Add to dashboard Cite

show abstract

“…On the other hand, supramolecular and charge-transfer complexes of [60]- and [70]fullerenes , have generated an avalanche of research activity for their potential application in photophysics, − superconductivity, ferromagnetism, and photo- and biomolecular chemistry. , The importance of such studies is revealed in a good number of books and review articles. − The surface chemical activity of some water-soluble hexasulfonated calix[6]arene derivatives has been shown tensiometrically through determination of critical micellization concentration (cmc), and it has been claimed in some cases where no cmc can be found that such molecules behave as “unimolecular micelles”. Water-insoluble calixarenes are, therefore, expected to exhibit surface chemical activity through the formation of “reverse” or “inverted” micelles . To our knowledge, so far no attempt has been made to establish this by a spectroscopic method.…”

Section: Introductionmentioning

confidence: 99%

Evidence of Reverse Micellization of a Calix[4]arene through a Study of Its Charge Transfer and Host−Guest Complexation with [60]Fullerene

et al. 2004

View full text Add to dashboard Cite

By UV−vis absorption and fluorescence spectroscopy it has been established that 25,27-dihydroxy-26,28-dimethoxycalix[4]arene (1) forms reverse micelles in CCl4 and n-hexane media. The new feature of this compound as a surfactant is that even before micelle formation it can incorporate water molecules and the critical micellization concentration (cmc) in nonaqueous media increases with increase in ω (=water:1 mole ratio). The inclusion complex of 1 with [70]fullerene has a CT absorption band that, in conjunction with those of some quinone complexes of 1, leads to the determination of the vertical ionization potential of 1. 1H NMR spectrometric determination of the formation constant (K) of the inclusion complex of [60]fullerene with 1 in CCl4 has revealed that K increases on addition of microquantities of water. This has been rationalized by assuming that the −OH groups of the calix[4]arene molecules attach themselves to the water micropool of the reverse micelles by forming H-bonds and the individual calix[4]arene molecule obtains a conical conformation with a wider rim diameter than that in the absence of water and that this preorganization facilitates inclusion. By utilizing the spectral variation of the [60]fullerene·1 complex in CCl4 as the continuous medium with change in ω, a critical ω (=8) has been found below which the water in the micropool is “bound” and above which “free” water begins to accumulate in the water micropool.

show abstract

“…Since these solutions should be normally characterized by the highest contents of micelles it is possible to explain the observed behaviour by a change in aggregate size or shape. Some tentative calculations on ellipsoids and rodshaped aggregates have been undertaken [3], but it is our intention to return to these calculations later on together with data from other microemulsion systems. These systems with a more polar co-surfactant are more difficult to interpret, since these systems may be characterized by rather loose structures and quite different mobilities for the ions [11][12][13].…”

Section: (2) Resultsmentioning

confidence: 99%

“…In earlier works one of us has presented a geometrical model for w/o microemulsions in the system sodium octanoate/water/n-decanol [1][2][3]. The model is based upon assumptions of an equal surface charge density between co-existing mesoaggregates and the aggregates in the investigated solution phase and further of the states of the surfactant as well as the solubilized water molecules.…”

Section: Introductionmentioning

confidence: 99%

Some dielectric properties of reversed micelles in the system sodium octanoate/water/n-decanol

Sjöblom

Nylander

Lundström

1982

Colloid & Polymer Sci

View full text Add to dashboard Cite

Abstract:We have found it possible to estimate the dielectric constant of the aqueous micellar core by means of quite simple calculations. The presented method requires assumptions about the particle shape and about the distribution of the different species in order to obtain the right order of magnitude. The presented calculations deal only with limited conditions in the model system sodium octanoate/water/decanol. Here we find that a spherical micelle model can be applied to surprisingly broad concentration intervals. At the alcohol-poor phase boundary other kinds of aggregates might occur. It is our purpose to develop the presented model to involve other particle shapes and also other model systems.

show abstract

Inverted Micellar Systems and Their Relations to Microemulsions

Cited by 11 publications

References 8 publications

Reversed micellar solutions in the system sodium octanoate/decanol/water: Model calculations and dynamic light scattering measurements

Reversed micellar solutions in the system sodium octanoate/decanol/water: Model calculations and dynamic light scattering measurements

Evidence of Reverse Micellization of a Calix[4]arene through a Study of Its Charge Transfer and Host−Guest Complexation with [60]Fullerene

Some dielectric properties of reversed micelles in the system sodium octanoate/water/n-decanol

Contact Info

Product

Resources

About