Formation and Growth of Gemini Surfactant (12-<i>s</i>-12) Micelles as a Modulate by Spacers: A Thermodynamic and Small-Angle Neutron Scattering (SANS) Study

Chavda, Suresh; Kuperkar, Ketan; Bahadur, Prashant

doi:10.1021/je2001683

Cited by 48 publications

(31 citation statements)

References 37 publications

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“…However, change in behaviour occurs much earlier in the case of a salt addition than in aqueous solution. a flexible loop or wicket-like arrangement is seen where the long spacer remains outward from the interface, occupying a larger area per molecule (A min ) [28][29][30][31]. This Br À has a greater ability to penetrate the Stern layer or interact with the quarternised triphenylphosphonium cation, thereby undergoing condensation and neutralising the overall charge on the micellar surface.…”

Section: Effect Of Saltmentioning

confidence: 99%

Solubilisation study of water‐insoluble dye in cationic single/dimeric surfactant micelles: effect of headgroup, non‐polar tail, and spacer chain in aqueous and salt solution

Padasala

Kuperkar

Bahadur

2016

Coloration Technology

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The solubilisation of hydrophobic azo dye Orange OT in aqueous/salt solution in several cationic surfactant micelles was studied using UV-vis spectroscopy. An attempt was made to correlate dye solubilising strength with adsorption/micellar characteristics. In our experiments we determined the change in solubilisation of hydrophobic dye when added to an aqueous solution of oppositely charged quaternary-salt-based cationic surfactants (conventional and gemini) and remarked on the probable location of the solubilised dye in the surfactant micelle. Results highlight the onset of dye solubilisation around the critical micelle concentration of each surfactant, which is influenced by the non-polar tail, spacer, and polar headgroup, while no dye could be solubilised at concentrations below the critical micelle concentration.

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Section: Effect Of Saltmentioning

confidence: 99%

Solubilisation study of water‐insoluble dye in cationic single/dimeric surfactant micelles: effect of headgroup, non‐polar tail, and spacer chain in aqueous and salt solution

Padasala

Kuperkar

Bahadur

2016

Coloration Technology

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“…Additionally, an increase in the temperature causes a decrease in the charge density at micellar surface by lowering the aggregation number of micelle which leads to increase in a. [44,45] Information of temperature dependence of CMC and a value facilitate the calculation of the enthalpy of micellization [5,13,29,30,34] DH m ¼ À2RT 2 ð2 À aÞ d ln X CMC dT : ½3…”

Section: Thermodynamic Parameters Of Micellization In Presence Of Fixmentioning

confidence: 99%

“…One of the fundamental and important factors that contributes negatively (i.e., makes DH m more negative) is the release of more arranged water molecules (than bulk water) surrounded to hydrophobic surfactant tail; during transformation of tail from bulk phase to micellar phase. [44,47] Other important interaction that contributes negatively to DH m is repulsive electrostatic interaction between head groups. From the above facts, and as discussed earlier; the presence of glycols due to their hydrogen bonding ability increases repulsion between the ionic heads.…”

Section: Thermodynamic Parameters Of Micellization In Presence Of Fixmentioning

confidence: 99%

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Chavda

Bahadur

2013

Journal of Dispersion Science and Technology

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Effect of glycols viz., ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG) and tetraethylene glycol (TeEG) on micellization parameter of cationic surfactant tetradecyletrimethyl ammonium bromide (TTAB) was examined by means electrical conductivity measurements. The critical micelle concentration (CMC), degree of counterion dissociation (a) and Gibbs energy of micellization (DG m ) as well as Gibbs energy of transfer (DG t ) of surfactant tail from bulk phase to micellar phase as a functions glycol concentration at 303.15 K were evaluated. In ordered to obtain enthalpy (DH m ) and entropy (DS m ) of micellization, CMCs were determined in 10.0% of glycols in temperature range from 303.15 K to 323.15 K. Thermodynamic parameters of the micellization reveal that effectiveness of glycols to reduce micellization increases with concentration and with number of ethereal oxygen, [-O-] n in glycol molecule. INTRODUCTIONApplications of surfactants in fields like lubrication or oil-wetting cleaners and detergency require the use of surfactant in either a water-free or water-poor medium. This has stimulated a significant amount of interest towards the micellization of various surfactants in non-aqueous, polar organic media [1,2] and in mixed solvent having a significant amount of a polar solvent mixed with water. [3][4][5][6][7][8][9][10][11][12] Glycols are well known for their use as coolants and antifreezes and find application in pharmaceutical, cosmetics, and food industries. [13] In most these applications, surfactant is also present and, therefore, it is important to study the effect of glycol on micellization of surfactants. The properties of surfactant micelles can change significantly as the polar glycol solvent replaces the water in the system. Also, the addition of glycols to aqueous micellar surfactant solutions provides an opportunity to study the so called solvophobic effect (as opposed to the hydrophobic effect), which is used to describe micellization in polar solvent [3,14] The micellization in these solvents is similar in many aspects to the micellization in water although micellization is not as favorable as in water for given surfactant. [15] There is enormous literature that deals with effect of aqueous ethylene glycol (EG) on micellization of cationic, anionic and nonionic surfactants. [3][4][5][6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] From thermodynamic studies of micellization in presence of EG Ruiz [5,6] observed that due to lower cohesive energy of EG þwater mixed solvent system, aggregation number of micelles decreased. For alkyltrimethylammonium bromide surfactant in presence of aqueous EG and glycerol from electrochemical studies using surfactant selective electrode, Palepu and coworkers [3] concluded that logarithm of the critical micellar concentration (CMC) of surfactant is directly proportional to the solvent=water ratio expressed in weight percent. They have also investigate the effect of EG on binary mixtures of alkyltriphenylphosphonium brom...

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“…A series of symmetrical cationic gemini surfactants are synthesized, and their micellization study in aqueous solution is systematically reported. [36] Small-angle neutron scattering (SANS) inferred the presence of few morphological geometries ranging from spherical to rodlike micelles. [36] The mixed micellization, surface properties, and solubilization of mixtures of cationic gemini with conventional surfactants were studied in detail.…”

Section: Introductionmentioning

confidence: 99%

“…[36] Small-angle neutron scattering (SANS) inferred the presence of few morphological geometries ranging from spherical to rodlike micelles. [36] The mixed micellization, surface properties, and solubilization of mixtures of cationic gemini with conventional surfactants were studied in detail. [37] The cmc value of DTAB was reduced to one-sixth of its original value in the presence of a small amount of gemini surfactant.…”

Section: Introductionmentioning

confidence: 99%

Comparison Between Phase Behavior of Gemini Imidazoliums and Monomeric Ionic Liquid Surfactants in W/O Microemulsion Systems

Chai

Zhang

Liu

et al. 2014

Journal of Dispersion Science and Technology

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GRAPHICAL ABSTRACTThe composition and structural parameters of W/O microemulsions containing gemini surfactant 1,4-bis(3-dodecylimidazolium-1-yl)butane bromide [C 12 (Bim) 2 -2Br] and W/O microemulsions containing ionic liquid type surfactant 1-dodecyl-3-methylimidazolium bromide (C 12 mimBr) were studied and compared at different molar ratios of water to surfactant (x o ). The mole fractions of the alcohol in the interfacial layer X i a in C 12 (Bim) 2 -2Br-based systems are always larger than that in C 12 mimBr-based systems. However, the mole fractions of the alcohol in the oil phase X o a are nearly the same for both the systems. The C 12 (Bim) 2 -2Br-based systems have greater absolute values of the Gibbs energy (ÀDG o o!i ) than that of C 12 mimBr-based systems. In the C 12 (Bim) 2 -2Br-based systems, a large number of cosurfactants at the interfacial layer is conducive for the formation of a smaller droplet. The effects of alcohols, alkanes, and salinity on the composition and structural parameters of the two systems were also investigated and discussed.

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Formation and Growth of Gemini Surfactant (12-s-12) Micelles as a Modulate by Spacers: A Thermodynamic and Small-Angle Neutron Scattering (SANS) Study

Cited by 48 publications

References 37 publications

Solubilisation study of water‐insoluble dye in cationic single/dimeric surfactant micelles: effect of headgroup, non‐polar tail, and spacer chain in aqueous and salt solution

Solubilisation study of water‐insoluble dye in cationic single/dimeric surfactant micelles: effect of headgroup, non‐polar tail, and spacer chain in aqueous and salt solution

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Comparison Between Phase Behavior of Gemini Imidazoliums and Monomeric Ionic Liquid Surfactants in W/O Microemulsion Systems

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