Investigation of influence of nonionic additives on structural changes of water droplets encapsulated in AOT reverse micelles by instrumental methods

Butkhuzi, Tinatin; Kurtanidze, Manoni; Chaladze, R.; Gvaramia, Manuchar; Rukhadze, M. D.; Bezarashvili, George; Sigua, Ketevan; Pradhan, Padmanava

doi:10.1016/j.colsurfa.2014.03.067

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The role of additives, in particular, is astounding since depending on their structure they can either promote or demote the clustering effect and hence the desired applications can be tuned [26,27]. Largely, the additives which break the solvent structure, promote the clustering effect whereas vice versa occurs when a structure making additive is added [28,29]. In water, the hydrophobic solutes add to the clustering effects (like micellization of surfactants) by enhancing the nonpolarity of the systems whereas phenomenon overturns when a hydrophilic solute is added.…”

Section: Introductionmentioning

confidence: 98%

Organization of amphiphiles, part XIV: Studies on the interaction of a novel organic molecule with surfactant in solution and at air–water interface

Misra

Das²,

Dash³

et al. 2014

Journal of Molecular Liquids

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Section: Introductionmentioning

confidence: 98%

Organization of amphiphiles, part XIV: Studies on the interaction of a novel organic molecule with surfactant in solution and at air–water interface

Misra

Das²,

Dash³

et al. 2014

Journal of Molecular Liquids

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“…Our early investigations are devoted to the study of structure of AOT reverse micelles by UV–visible, IR, and NMR spectroscopic methods in the presence of structure‐making and structure‐breaking ionic and nonionic additives (Butkhuzi et al, , ). The goal of the present work was to study the influence of additives of ionic biological surfactant sodium cholate (SC) introduced in the water nanodroplets of AOT reverse micelles using infrared and UV–visible spectroscopy, conductivity measurements, and dynamic light scattering method.…”

Section: Introductionmentioning

confidence: 99%

Structure of Mixed Reverse Microemulsions Based on Sodium Bis (2‐Ethylhexyl) Sulfosuccinate and Sodium Cholate

Tikanadze

Kurtanidze

Rukhadze

et al. 2019

J Surfact & Detergents

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The microenvironment of water droplets of sodium bis (2‐ethylhexyl) sulfosuccinate (AOT) and sodium cholate mixed reverse microemulsions was studied. Structural changes of water pockets in mixed reverse micelles were investigated by IR spectroscopy. The O‐H stretching vibrational absorption spectra in the region of 3000–3800 cm−1 were fit to three subpeaks with the Monte Carlo method. It was revealed that additives of sodium cholate suppress free water fraction in the water droplets of reverse micelles from 31% to 20% and support rising of bound fraction from 53% to 65%. The binding of optical probe ortho‐nitroaniline to the mixed reverse micelles was determined by UV–visible spectroscopy. It was found that introducing of additives of sodium cholate below its critical micelle concentration (CMC) causes increasing of values of binding constant Kb twice compared with reverse micelles modified with pure water. However, values of the binding constant were reduced 4‐fold at concentrations of sodium cholate higher than its CMC. Electrical conductivity of the reverse mixed micellar solutions (AOT + sodium cholate) was measured. Water‐induced percolation in conductance of mixed reverse microemulsions occurs at a lower value of water/surfactant molar ratio (W) under the influence of sodium cholate, viz. electrical percolation threshold decreases from W = 32 to W = 15. The size of water droplets was estimated with the dynamic light scattering method. It was found that additives of sodium cholate below and higher than the CMC results in increasing and decreasing of hydrodynamic diameters of the water droplets, respectively, but sizes of water droplets decrease at concentrations of sodium cholate higher than its CMC.

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“…Traditionally, water is the polar phase, often with other molecules solvated within the RM . An example is probe molecules that report the characteristics of RMs through various spectroscopies such as light absorption, emission, or interaction with magnetic fields. , RM self-assembly occurs with certain nonaqueous polar liquids, for example, ethylene glycol, glycerol, formamide, dimethylformamide, and some ionic liquids, as well as aqueous mixtures. − In some cases, RM formation requires a fourth component to form a stable microemulsion (a cosurfactant). This is particularly true for single-chain surfactants, for example, sodium dodecylsulfate and cetyltrimethylammonium bromide (CTAB) …”

Section: Introductionmentioning

confidence: 99%

Sweet Confinement: Glucose and Carbohydrate Osmolytes in Reverse Micelles

et al. 2018

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The research presented here reports the surprising observation that adding glucose and other carbohydrate osmolytes to the polar phase of water-containing reverse micelles causes the particles to shrink. This apparent change in reverse micelle size is attributed to two factors: an increase in the surface area per surfactant molecule induced by the presence of carbohydrate and changes in the particle shape eccentricity. The studies reported here not only focus on glucose but also explore other carbohydrate osmolytes, specifically ethylene glycol, glycerol, erythritol, xylitol, sorbitol, myo-inositol, and trehalose, in the nanoconfined environments of reverse micelles. Through two-dimensional proton nuclear Overhauser enhancement nuclear magnetic resonance spectroscopy, the osmolytes were determined to reside solvated in the aqueous interior of the reverse micelles. This paper reports the loading limit of carbohydrates into AOT [sodium bis(2-ethylhexyl)sulfosuccinate] reverse micelles, demonstrates the location of the carbohydrates in the reverse micelles, and shows an unexpected effect where the carbohydrates add to the reverse micelle volume without causing an apparent increase in the reverse micelle diameter.

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Investigation of influence of nonionic additives on structural changes of water droplets encapsulated in AOT reverse micelles by instrumental methods

Cited by 5 publications

References 20 publications

Organization of amphiphiles, part XIV: Studies on the interaction of a novel organic molecule with surfactant in solution and at air–water interface

Organization of amphiphiles, part XIV: Studies on the interaction of a novel organic molecule with surfactant in solution and at air–water interface

Structure of Mixed Reverse Microemulsions Based on Sodium Bis (2‐Ethylhexyl) Sulfosuccinate and Sodium Cholate

Sweet Confinement: Glucose and Carbohydrate Osmolytes in Reverse Micelles

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