Aggregation and adsorption of sodium dioctylsulfosuccinate in aqueous ammonium chloride solution: Role of mixed counterions

Dey, Jahar; Thapa, Uttam; Ismail, K.

doi:10.1016/j.jcis.2011.10.055

Cited by 19 publications

(13 citation statements)

References 39 publications

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“…The CH plot is shown in the inset of Figure a. From the plot, it is very clear that AOT shows two regions of counter ion binding in presence of Na‐PTS, similar to our observations made in a series of previous works . In the present case, the counter ion binding constant (β) shows a jump from 0.3 to 0.55 around 15 mM Na‐PTS, which is around the same region shown for a number of electrolytes.…”

Section: Resultssupporting

confidence: 89%

“…The other two reducing agents used in the present study are expected to influence the aggregation behavior of AOT in a similar manner. In case of NaBH 4 and AA, the counter ions are Na + and H + respectively and will bind to the ionic micelles of AOT and influence the shape transition of AOT around the same critical concentration as observed in cases of other salts …”

Section: Resultsmentioning

confidence: 96%

“…In case of NaBH 4 and AA, the counter ions are Na + and H + respectively and will bind to the ionic micelles of AOT and influence the shape transition of AOT around the same critical concentration as observed in cases of other salts. [27][28][29][36][37]…”

Section: Aggregation Behavior Of Aot In Presence Of Na-ptsmentioning

confidence: 99%

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AOT Micelles/Vesicles for Synthesis of Silver Nanoparticles and Micellar Transitions Affected by Nanoparticles

et al. 2016

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A facile method for the synthesis of silver nanoparticles (Ag NPs) is reported using sodium para‐toluene sulphonate (NaPTS) as the reducing agent and AOT micelles and vesicles as capping agents, leading to the development of a system comprising of AOT micelles/vesicles along with Ag NPs. A single component, Na‐PTS, has been used to tune the micellar aggregates as well as for the synthesis of Ag NPs. The aggregation behavior of AOT in aqueous Na‐PTS has been studied by the method of surface tension and the changes in the morphology of AOT micelles by small angle neutron scattering (SANS) measurements. The synthesis of Ag NPs have also been carried out using common reducing agents such as sodium borohydride and ascorbic acid. SANS measurements have also been performed in the ternary systems of micelles, vesicles and NPs and reveal the formation of fractal structures of the NPs. The ternary systems have been also tested for their antibacterial activity. A very important observation made in the present study is the large decrease in the concentration of salt required to bring about micellar shape transition in the presence of small amounts of NPs.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 96%

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AOT Micelles/Vesicles for Synthesis of Silver Nanoparticles and Micellar Transitions Affected by Nanoparticles

et al. 2016

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“…2, it is shown that BF À 4 ion is richer in the adsorbed film than in the bulk phase, which is expected from that the affinity of counterions to the surface obeys the order of the Hofmeister series [2]. Similar results were also obtained by other researchers [38,39]. We also evaluated the miscibility of counterions in reference to the thermodynamic criterion.…”

Section: Miscibility Of Counterionssupporting

confidence: 76%

Study on the distribution of binary mixed counterions in surfactant adsorbed films by total reflection XAFS measurements

Imai

Takumi

et al. 2012

Journal of Colloid and Interface Science

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“…It was shown in the earlier study 47,50,54 that the shape change of AOT micelle is responsible for the abrupt change in the value of b in aqueous NaCl, NH 4 Cl and tetraalkylammonium bromide solutions. The effect of the four organic coions on the shape/ morphological transition of AOT aggregates is discussed below on the basis of the SANS data.…”

Section: Sans Measurementsmentioning

confidence: 96%

Influence of hydrotropic coions on the shape transitions of sodium dioctylsulfosuccinate aggregates in an aqueous medium

et al. 2015

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The effect of hydrotropic organic coions on the physicochemical behavior of ionic surfactants has not yet been understood clearly, although as counterions they are known to have a remarkable effect on the microstructures of ionic surfactants. In this paper therefore the aggregation behavior of sodium dioctylsulfosuccinate (AOT) has been studied in aqueous media in the presence of sodium benzoate (NaB)/ sodium salicylate (NaSa)/sodium meta-hydroxybenzoate (Na-mHB)/sodium para-hydroxybenzoate (NapHB). Surface tension and small angle neutron scattering (SANS) techniques are mainly used. AOT is known to have a special counterion binding behavior (SCB) with respect to sodium counterion, viz., at about 0.015 mol kg À1 of added NaCl the counterion binding constant of AOT increases suddenly by two fold which is attributed to the shape change of the AOT micelle. The SCB of AOT is found to exist in the presence of benzoate, m-hydroxybenzoate and p-hydroxybenzoate coions, but not in the presence of o-hydroxybenzoate (salicylate) coions. The SANS data, on the other hand, showed that shape transition of the AOT aggregate takes place in the presence of all the four hydrotropic coions; the concentration of NaSa required to induce the shape transition was however higher. A sharp increase in the value of the hydrodynamic diameter determined by the dynamic light scattering (DLS) experiments also indicates the shape transition of AOT aggregates in the presence of the salts. Chemical shift values of benzoate and hydroxybenzoates confirmed the binding of these coions to an AOT micelle. The binding of the salicylate coion is shown to be stronger due to its low hydration energy and high pK h (K h is the hydrolysis constant) values.

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Aggregation and adsorption of sodium dioctylsulfosuccinate in aqueous ammonium chloride solution: Role of mixed counterions

Cited by 19 publications

References 39 publications

AOT Micelles/Vesicles for Synthesis of Silver Nanoparticles and Micellar Transitions Affected by Nanoparticles

AOT Micelles/Vesicles for Synthesis of Silver Nanoparticles and Micellar Transitions Affected by Nanoparticles

Study on the distribution of binary mixed counterions in surfactant adsorbed films by total reflection XAFS measurements

Influence of hydrotropic coions on the shape transitions of sodium dioctylsulfosuccinate aggregates in an aqueous medium

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