cyclohexane n hexanol water in oil emulsion

Stable boundary water is detected at the microemulsion interface. Hexane, specifically, is naturally occurring and derived from crude oil.

In addition, an n-hexanol/cyclohexane mixture with an alcohol molar fraction of 0.177 has been titrated with water, revealing the formation of a microemulsion containing water droplets that evolves to a bicontinuous microemulsion with increasing water content. NIR allows verifying the formation of n-hexanol polymeric species. 1D, DOSY, and T1and T2relaxation time analyses by 1H-NMR allow understanding the dynamics of the mixtures. The microenvironment in nonionic reverse micelles of Triton X-100,n-hexanol, and water in cyclohexane is investigated by using methyl orange (MO) and methylene blue (MB) as absorption probes. Molecular interactions are found to be dominated by dispersion forces, hydrogen bonding, and dipolar interactions, to different extents at different n-hexanol composition ranges. Abrupt changes on spectroscopic responses have been observed at low molar fractions of n-hexanol, which are related to hydrogen bond network formation that includes trace water. Stable boundary water is detected at the microemulsion interface.ĪB - In this work we present a study on the association of n-hexanol in cyclohexane using NMR and NIR spectroscopies. NIR allows verifying the formation of n-hexanol polymeric species. Water-in-oil microemulsions composed of cyclohexane or toluene, sodium dodecyl sulfate, 1-pentanol, and water have been prepared by choosing compositions close. 1D, DOSY, and T1and T2relaxation time analyses by 1H-NMR allow understanding the dynamics of the mixtures. N2 - In this work we present a study on the association of n-hexanol in cyclohexane using NMR and NIR spectroscopies.

As the main characteristics of the lamellar phase we find a very restricted mobility of the molecules involved, and water chemical shifts in 1D 1H NMR spectra of around 5.0 ppm, higher than that of bulk water appearing at 4.7 ppm.T1 - N-Hexanol association in cyclohexane studied by NMR and NIR spectroscopies 1D 1H NMR spectral changes correlate with the different characteristics of the different phases. Structural features of the microemulsions Reversed micelles formed by surfactant molecules in hy- formed by Trx-100, n-hexanol, water, and cyclohexane have drocarbon solvents with their polar headgroups pointing in- been studied by NMR relaxation and ESR spin probe meth- ward are simple yet interesting models of biological membranes ods (9). Triton X-100/water) for the catalytic conversion of H2S gas to sulfur nanoparticles. Molecular assembly in the three phases is organized around hydrogen bond networks in which the hydroxyl groups of both TX-100 and n-hexanol, ethylene oxide groups of TX-100, and water participate. sively studied in w/o microemulsion (cyclohexane/n-hexanol/. Molecular dynamics measured by 1H NMR techniques, such as DOSY, and calculations of T 1 and T 2 relaxation times allow distinguishing the transition between the different phases and justifying their structure. The two corresponding transitions occur at water/EO/n-hexanol molar ratios of 2/1/2 (clear to lamella), and 3/1/2 (lamella to microemulsion), while phase separation occurs at a molar ratio of 4/1/2, highlighting the important role of stoichiometry.

At these conditions the addition of water consecutively produces the appearance of three defined phases: a clear solution, a lamellar phase, and a microemulsion. The ratio Triton X-100/n-hexanol has been chosen to afford a stoichiometry of ethylene oxide (EO) residues/n-hexanol of 1/2. The composition of organic components has been chosen at a ratio n-hexanol/cyclohexane where a well-formed hydrogen bond network has been described. Molecular aggregation in a mixture of Triton X-100/n-hexanol/cyclohexane at a molar ratio of 1/16/74 is studied upon addition of small amounts of water.

Cyclohexane n hexanol water in oil emulsion