The solution phase with reversed micelles in the cetyl trimethylammonium bromide-hexanol-water system

Ekwall, Per; Mandell, Leo; Solyom, Peter

doi:10.1016/0021-9797(71)90119-6

Cited by 45 publications

(23 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this region, thermodynamically driven surfactant self-assembly generates aggregates known as reverse or inverted micelles (e.g. L 2 phase on Figure 1), 22 of which spherical reverse micelles are the most common form. Added polar or ionic components will become compartmentalized into the central cores of these reversed micelles, hence affording fine dispersion of inorganic materials in oil.…”

Section: Water In Oil Microemulsionsmentioning

confidence: 99%

Recent advances in nanoparticle synthesis with reversed micelles

Eastoe

Hollamby

Hudson

2006

Advances in Colloid and Interface Science

581

408

View full text Add to dashboard Cite

Section: Water In Oil Microemulsionsmentioning

confidence: 99%

Recent advances in nanoparticle synthesis with reversed micelles

Eastoe

Hollamby

Hudson

2006

Advances in Colloid and Interface Science

581

408

View full text Add to dashboard Cite

“…It is observed that viscosity of the solution begins to increase rather rapidly with the increasing concentration of the surfactant, suggesting a change in the structure of micelles [11,12].…”

Section: T T a B C O N C E N T R A Ti O N I N W A T E R [ M M ]mentioning

confidence: 96%

A comparative study of transformation of micellar structures in CTAB and TTAB binary systems using Positron Lifetime Spectroscopy

Yadav

Singh

Choudhary

et al. 2009

Phys. Status Solidi (c)

View full text Add to dashboard Cite

The micellar structures of cetyl‐tri‐methyl ammonium bromide (CTAB) and its homologues have been investigated employing several conventional techniques. However, due to lack of sensitivity inherent in these techniques and the perturbation introduced by the probe, the detailed structures of the aggregates in the so‐called single phase regions of these systems are far from being fully understood. Positron has been found to be a useful non‐destructive probe for investigating micellar structures in surfactant systems [1‐3] The present study is an effort to get a better insight into the micellar structures and their transformations in CTAB and TTAB aqueous binary systems Positron lifetime spectroscopy has been employed to study these systems covering a wide range of surfactant concentrations. A comparative study of the results obtained for the two surfactant systems have been discussed in this paper. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

“…a constant energy variation corresponding to the transfer of a CH2-group from the aqueous phase to the micellar phase. The transition from the micellar solution of lower concentration to a mesophase can be produced by solubilization of alcohol as shown in the system cetyltrimethylammonium bromide (CTAB)-hexanolwater (Ekwall et aL, 1971). In the CTAB-water system with low hexanol content a mesomorphic phase E with hexagonally packed hydrophilic rods is present in addition to the isotropic globular miceUe phase (L~, see Danielsson, 1976 for the alphabetical notation).…”

Section: Enthalpy Of Solution In the Interlamellar Phasementioning

confidence: 99%

“…Mechanisms (lb) and (lc) can be detected by an increase of the basal spacing of the clay. The expansion of the clay is caused by the development of an aggregate structure similar to phenomena in ternary bulk systems for which variations of Bragg spacings are indicative of different aggregate types (Ekwall et al, 1971). The low concentration of intedamellar alcohol at which this phenomenon started demanded that some of the cations were surrounded by sufficient alcohol molecules to form aggregate patches acting as pillars.…”

Section: Introductionmentioning

confidence: 98%

Adsorption of n-Aliphatic Alcohols from Dilute Aqueous Solutions on RNH₃-Montmorillonites. III. Interlamellar Aggregation of the Adsorbate

Stul

1985

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--The large amount of water in the interlamellar space of alkylammonium montmorillonites in aqueous solutions is not fixed by intercalated hexanol or octanol. The hydration of the NH3+-group and the filling of the empty spaces between the carbon chains are responsible for this phenomenon. Hydrogen bonds between the alcohols and the ammonium groups reduce the enthalpy of solution of hexanol and octanol in the interlamellar region at infinite dilution to + 17.6 and + 12.7 kJ/mole, respectively. Selfassociation of the alcohols further diminishes the enthalpy of solution at higher alcohol concentration. The interlamellar fixation of the RNH3 cations prevents a micellization as has been obtained in bulk solutions. At a given alcohol concentration smectic type aggregates, i.e., double layers of alcohol molecules, appear as shown by an increase of the basal spacing of the organo-clay complexes. The aggregate formation is favored by a longer chain length of both the cation and the alcohol. Key Words--Adsorption, Alcohol, Alkylammonium cations, Intercalation, Micellization, Montmorillonire. Samenvatting--Het hoge watergehalte van de interlamellaire faze van alkylammonium-montmorillonieten in waterige oplossing is niet gefixeerd door de binnenkomende hexanol of oktanol. De hydratatie van de NH3+-groep en het opvullen van de ruimtes tussen de koolwaterstofketens zijn er verantwoordelijk voor. Bij oneindige verdunning reduceren waterstotbruggen tussen alkoholen en ammoniumgroepen de oplossings-enthalpie van respektievelijk hexanol en oktanol in de interlamellaire raze tot + 17,6 en 12,7 kJ/mol. Bij hogere alkoholkoncentratie vermindert deze oplossings-enthalpie verder door associatie van de alkoholen. De interlamellaire fixatie van RNH3 kationen verhindert her miceUisatiefenomeen zoals het zich in bulk oplossingen voordoet. Bij een bepaalde alkoholkoncentratie duidt een verhoging van de basisafstand van de organo-kleikompleksen het optreden aan van aggregaten van het smektiet type, d.i. een dubbellaag van alkohol molekulen. Deze aggregaat vorming wordt bevorderd door een langere keten van zowel het kation als van de alkohol.

show abstract

The solution phase with reversed micelles in the cetyl trimethylammonium bromide-hexanol-water system

Cited by 45 publications

References 11 publications

Recent advances in nanoparticle synthesis with reversed micelles

Recent advances in nanoparticle synthesis with reversed micelles

A comparative study of transformation of micellar structures in CTAB and TTAB binary systems using Positron Lifetime Spectroscopy

Adsorption of n-Aliphatic Alcohols from Dilute Aqueous Solutions on RNH₃-Montmorillonites. III. Interlamellar Aggregation of the Adsorbate

Contact Info

Product

Resources

About

The solution phase with reversed micelles in the cetyl trimethylammonium bromide-hexanol-water system

Cited by 45 publications

References 11 publications

Recent advances in nanoparticle synthesis with reversed micelles

Recent advances in nanoparticle synthesis with reversed micelles

A comparative study of transformation of micellar structures in CTAB and TTAB binary systems using Positron Lifetime Spectroscopy

Adsorption of n-Aliphatic Alcohols from Dilute Aqueous Solutions on RNH3-Montmorillonites. III. Interlamellar Aggregation of the Adsorbate

Contact Info

Product

Resources

About

Adsorption of n-Aliphatic Alcohols from Dilute Aqueous Solutions on RNH₃-Montmorillonites. III. Interlamellar Aggregation of the Adsorbate