The Influence of Amphiphilic Substances on the Mutual Solubilities in Binary Liquid Systems (Microemulsions)

Herrmann, C.; Würz, U.; Kahlweit, M.

doi:10.1002/bbpc.197800119

Cited by 20 publications

(3 citation statements)

References 14 publications

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“…The most effective alcohol is 2-propanol (P) followed closely by 2methyl-2-propanol. Similar conclusions were reached by Herrmann et al 6 Another advantage of 2-propanol is that the changes in the partial molal heat capacities and volumes of the binary system are spread out over a reasonably large concentration region, thus making it easier to see modifications of the changes with the ternary systems. Consequently, 2-propanol was taken as the active component of our "detergentless microemulsion".…”

Section: Introductionsupporting

confidence: 82%

“…Alcohols alone can solubilize an appreciable quantity of light oils in water. For example, Vorob'eva and Karapet'yants,4 Fedoseeva et al, 5 and Kahlweit et al 6 made systematic studies of the phase diagrams of the ternary systems hydrocarbon-alcohol-water. Knickerbocker et al7 investigated the effect of NaCl on these phase equilibria and Huyskens et al8 studied the effect of alcohols in solubilizing water in organic solvents.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat capacities and volumes of the ternary system benzene-water-2-propanol

Lara¹,

Perron²,

Desnoyers³

1981

J. Phys. Chem.

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The densities and heat capacities per unit volume were measured over the whole miscibility region of the ternary system benzene-2-propanol-water. From these data, the apparent molal volumes and heat capacities of benzene and water were calculated. These functions for benzene show large changes in the water-rich region while the functions for water change rapidly in the benzene-rich region. In the intermediate range all changes are gradual. These results suggest that microtransitions, which are analogous to the formation of micelles and inverse micelles, occur in the two extremes of the phase diagram, and in that this system behaves similarly to a microemulsion. The absence of sudden changes in the thermodynamic functions in the intermediate region is consistent with a bicontinuous model for microemulsions.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Heat capacities and volumes of the ternary system benzene-water-2-propanol

Lara¹,

Perron²,

Desnoyers³

1981

J. Phys. Chem.

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“…[23][24][25][26] When the study of binary solvent mixtures is expanded to include a third component (e.g., a solute such as benzene), issues of preferential solvation 27 arise, in which the local solvent composition about a solute may differ from that of the bulk mixture. In this context, the preferential solvation of benzene by water or methanol molecules is interesting, since both benzene and water are highly soluble in methanol but immiscible with one another; 28 therefore, studies of their clusters have the potential to probe the structural consequences of this disruption on a molecular scale.…”

Section: Introductionmentioning

confidence: 99%

Resonant Ion-Dip Infrared Spectroscopy of Ternary Benzene−(Water)_n(Methanol)_m Hydrogen-Bonded Clusters

et al. 1999

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Resonant two-photon ionization, IR−UV hole-burning, and resonant ion-dip infrared (RIDIR) spectroscopies have been employed along with density functional theory (DFT) calculations to assign and characterize the hydrogen-bonded topologies and structures of eight benzene−(H2O) n (CH3OH) m , cluster isomers (hereafter shortened to BW n M m ) with n + m ≤ 4. The O−H stretch infrared fundamentals are used to determine the H-bonding topology of the clusters. However, in several cases, the O−H stretch spectrum leaves an ambiguity regarding the position of the methanols within the structure. In these cases, the methyl CH stretch region serves as a secondary probe capable of distinguishing among the various possibilities. For n + m = 2, a single BWM isomer is observed with OH stretch fundamentals at 3508, 3606, and 3718 cm-1. A comparison of the methyl CH stretch transitions of BWM and BM2 reveals that the methanol in BWM accepts a H-bond from water and forms a π H-bond with benzene. The n + m = 3 results show the subtle effects that solvent composition can have on the lowest-energy structure of the cluster. Two isomers of BW2M are observed but just one of BWM2. Both water-rich BW2M isomers possess transitions characteristic of cyclic W2M subclusters in which water is π H-bonded to benzene. Each isomer shows a set of three single-donor OH stretch transitions, a π H-bonded OH stretch near 3650 cm-1 and a free OH stretch (∼3716 cm-1). The two BW2M isomers differ in the position of the methanol in the H-bonded cycles. Conversely, the methanol-rich BWM2 cluster OH stretch transitions are those of a WM2 chain, with a signature π H-bonded OH stretch located at about 3590 cm-1. The methyl CH stretch absorptions are used to deduce that the water molecule in BWM2 is in the donor position in the chain, furthest from benzene's π cloud. Finally, the spectra for the n + m = 4 series show systematic changes in the spectrum with changing methanol content in the cluster. In all cases, both OH stretch and CH stretch transitions point firmly to cyclic W n M m subclusters in which one of the free OH groups on a water molecule in the cycle is used to π H-bond to benzene.

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Untersuchung von Assoziationserscheinungen in der Nähe der Mischungslücke von tensidhaltigen Phenol‐Wasser‐ und Isobuttersäure‐Wasser‐Gemischen

Platz

Wojak

1980

Ber Bunsenges Phys Chem

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In der Nähe von Mischungslücken tensidhaltiger flüssiger Mehrkomponentensysteme treten bereits im homogenen Bereich intensive Trübungserscheinungen auf. Am Beispiel der Systeme Phenol‐Wasser und Isobuttersäure‐Wasser wurden derartige Effekte mit Hilfe von T‐Sprung‐ und Stoßrohr‐Relaxationsverfahren mit optischer Detektion und der dynamischen Lichtstreuung untersucht. Als amphiphile Komponenten dienten Natriumdodecylsulfat und die Unterphosphorige Säure, die in wäßriger Lösung keine mizellbildenden Eigenschaften zeigt. — Als gemeinsame Ausgangspunkte für die Messungen wurden auf 20° eingestellte kritische Gemische gewählt. Alle Systeme zeigten in der Umgebung des kritischen Punktes sehr ähnliches Verhalten. Die Ergebnisse lassen sich am besten deuten durch die Annahme, daß die Trübung durch lockere Assoziate von Phenol oder Isobuttersäure verursacht wird, die in diffusionskontrolliertem Gleichgewicht mit der Umgebung stehen, und nicht durch mizellare Aggregate aus der amphiphilen Komponente. Die ähnlichen Eigenschaften aller Systeme sind durch die Nachbarschaft des kritischen Punktes bedingt.

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The Influence of Amphiphilic Substances on the Mutual Solubilities in Binary Liquid Systems (Microemulsions)

Cited by 20 publications

References 14 publications

Heat capacities and volumes of the ternary system benzene-water-2-propanol

Heat capacities and volumes of the ternary system benzene-water-2-propanol

Resonant Ion-Dip Infrared Spectroscopy of Ternary Benzene−(Water)_n(Methanol)_m Hydrogen-Bonded Clusters

Untersuchung von Assoziationserscheinungen in der Nähe der Mischungslücke von tensidhaltigen Phenol‐Wasser‐ und Isobuttersäure‐Wasser‐Gemischen

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The Influence of Amphiphilic Substances on the Mutual Solubilities in Binary Liquid Systems (Microemulsions)

Cited by 20 publications

References 14 publications

Heat capacities and volumes of the ternary system benzene-water-2-propanol

Heat capacities and volumes of the ternary system benzene-water-2-propanol

Resonant Ion-Dip Infrared Spectroscopy of Ternary Benzene−(Water)n(Methanol)m Hydrogen-Bonded Clusters

Untersuchung von Assoziationserscheinungen in der Nähe der Mischungslücke von tensidhaltigen Phenol‐Wasser‐ und Isobuttersäure‐Wasser‐Gemischen

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Resonant Ion-Dip Infrared Spectroscopy of Ternary Benzene−(Water)_n(Methanol)_m Hydrogen-Bonded Clusters