Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C&lt;sub&gt;4&lt;/sub&gt; and C&lt;sub&gt;5&lt;/sub&gt;)/1-he×ane water/oil microemulsions with reference to their structure and related thermodynamics

Moulik, Satya P.; Aylward, Wanda M.; Palepu, R.

doi:10.1139/cjc-79-1-1

Cited by 4 publications

(2 citation statements)

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“…The droplets collide, fuse, and subsequently break apart, and during the process, exchange of mass between two fusing droplets may take place. − The transfer of ions from one droplet to another progressing in a certain direction under an applied electric field by way of fusion and fission can register an increase in conductance, which at a particular water content (ω) or temperature may show a drastic change (normally an increase) which is called percolation. Two types of percolation, (1) volume percolation − and (2) temperature percolation, can arise. − In the first, at a fixed mass of (surfactant + cosurfactant), an increase in water content increases droplet size for easier merging, thus providing increased mass transfer and conductance, i.e., favoring percolation. At a constant microemulsion composition or ω value, increased temperature may increase droplet collision, i.e., fusion among the droplets leading to easier transfer of mass or increased conductance augmenting percolation.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical Studies of Octadecyltrimethylammonium Bromide: A Critical Assessment of Its Solution Behavior with Reference to Formation of Micelle, and Microemulsion with n-Butanol and n-Heptane

et al. 2007

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Octadecyl-trimethyl-ammonium bromide (C18TAB) is a much less studied representative in the alkyltrimethylammonium halide surfactant series. A comprehensive study of its normal and reverse micelle (microemulsion) formation has been herein conducted by the methods of conductometry, tensiometry, fluorimetry, and microcalorimetry. The energetics of its air/liquid interfacial adsorption and self-association in aqueous solution have been examined. The phase behavior of its combinations with water, n-butanol, and n-heptane in the formation of microemulsions have been investigated with identification of a variety of phases. The energetics of formation of water dispersion in oil (w/o) has been evaluated from dilution experiments conducted at different temperatures. From the results, structural parameters of the droplets have been determined at different [water]/[surfactant] mole ratios (omega) and temperatures. The w/o dispersions have evidenced both volume- and temperature-induced conductance percolation. The results have been treated in light of the Scaling equations, and the associated parameters for the process have been determined. The activation energies for the temperature-induced percolation process of the w/o dispersion have been evaluated and assessed.

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Section: Resultsmentioning

confidence: 99%

Physicochemical Studies of Octadecyltrimethylammonium Bromide: A Critical Assessment of Its Solution Behavior with Reference to Formation of Micelle, and Microemulsion with n-Butanol and n-Heptane

et al. 2007

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“…Structural Parameters. The structural parameters of the microemulsion droplets were estimated following a simplified model. − ,− The droplets were assumed to be monodisperse and spherical, having a monomolecular film of amphiphile at the interface in their dispersion in oil. V d and A d are given by the relations and V d is related with V w , V s , and in the form The knowledge of from the dilution protocol discussed above helps to get according to the relation For the evaluation of V s , a relation equivalent to eq 25 has been used.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical Studies on Cetylammonium Bromide and Its Modified (Mono-, Di-, and Trihydroxyethylated) Head Group Analogues. Their Micellization Characteristics in Water and Thermodynamic and Structural Aspects of Water-in-Oil Microemulsions Formed with Them along with n-Hexanol and Isooctane

Mitra

Chakraborty²,

Bhattacharya³

et al. 2006

J. Phys. Chem. B

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The micellization behavior of cetylammonium bromide and its mono-, di-, and trihydroxyethylated head group analogues and water/oil (w/o) microemulsion formation with them have been studied with detailed thermodynamic and structural considerations. The critical micellar concentration, micellar aggregation number, and behavior of the surfactants at the air/solution interface have been studied in detail. The results have been analyzed and discussed. The formation of the w/o microemulsion stabilized by the aforesaid surfactants in conjunction with the cosurfactant n-hexanol in isooctane has been investigated by the dilution method. The energetics of the transfer of cosurfactant from oil to the interface has been estimated. The structural parameters, namely, droplet dimension, droplet number, and population of surfactant and cosurfactant on the droplet surface, have also been estimated. The efficacy of the surfactants in respect to water dispersion in oil and cosurfactant concentration level at the oil/water interface has been worked out. Such microemulsions are prospective compartmentalized systems to assist enzyme activities. In this respect, the trihydroxyethylated head group analogue in the above series has been found to be a better performer for the preparation and stabilization of microemulsions that has correlated well with its performance than the others in the hydrolysis of p-nitrophenyl-n-hexanoate by the enzyme Chromobacterium viscosum lipase.

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Phase Behavior of Nonaqueous Microemulsions of n‐Methyl‐2‐Pyrrolidinone/Diisooctylsodium Sulfosuccinate (AOT)/Alkanes

Moore

Palepu

2007

Journal of Dispersion Science and Technology

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The phase behavior of n-methyl-2-pyrrolidinone (NMP) microemulsions formed by the combination of NMP and oils (hexane, heptane, octane, and isooctane) in the presence of diisooctylsodium sulfosuccinate (AOT) were studied. The ternary plots were constructed and found to be similar in nature and consisted of a gel, a clear, or microemulsion, and a two phase region. Effects of varying amounts of water added to NMP and varying the chain length of n-alkane (as oil) on the microemulsion region were investigated. Fluorescence probes such as Auramine-O and the sodium salt of aniline-1-napthalenesulfonic acid were employed to investigate the nature of the microemulsion region. Volume and temperature induced percolation studies have indicated the absence of percolation process in these microemulsion systems.

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Phase behaviours and conductivity study of water/CPC/alkan-1-ol (C<sub>4</sub> and C<sub>5</sub>)/1-he×ane water/oil microemulsions with reference to their structure and related thermodynamics

Cited by 4 publications

References 0 publications

Physicochemical Studies of Octadecyltrimethylammonium Bromide: A Critical Assessment of Its Solution Behavior with Reference to Formation of Micelle, and Microemulsion with n-Butanol and n-Heptane

Physicochemical Studies of Octadecyltrimethylammonium Bromide: A Critical Assessment of Its Solution Behavior with Reference to Formation of Micelle, and Microemulsion with n-Butanol and n-Heptane

Physicochemical Studies on Cetylammonium Bromide and Its Modified (Mono-, Di-, and Trihydroxyethylated) Head Group Analogues. Their Micellization Characteristics in Water and Thermodynamic and Structural Aspects of Water-in-Oil Microemulsions Formed with Them along with n-Hexanol and Isooctane

Phase Behavior of Nonaqueous Microemulsions of n‐Methyl‐2‐Pyrrolidinone/Diisooctylsodium Sulfosuccinate (AOT)/Alkanes

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