scholarly journals Effect of Methanol on Viscosity of Aqueous Solutions of Cationic Surfactants at 298.15 to 323.15 K

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Sujit Kumar Shah ◽  
Sujeet Kumar Chatterjee ◽  
Ajaya Bhattarai
Keyword(s):  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Cationic Surfactants ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Solvent ◽  
Relative Viscosity ◽  
Dodecyltrimethylammonium Bromide ◽  
Solvent Interactions ◽  
Volume Fractions ◽  
Surfactant Solutions

Viscosity measurements have been made to the solutions of dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) in 0.10, 0.20, 0.30, and 0.40 volume fractions of methanol in methanol-water mixed solvent media at 298.15, 308.15, 318.15, and 323.25 K. Critical micelle concentration (CMC) values have been determined. From relative viscosity for surfactant solutions, related viscosityBcoefficients are calculated and the values are interpreted in terms of solute-solvent interactions.

scholarly journals A comparative study of Critical Micelle Concentration (CMC) and Free Energy of Micellization of cationic surfactant and anionic surfactant in different composition of methanol-water mixed solvent media by conductometric method at 308.15 K

BIBECHANA ◽  
2012 ◽  
Vol 8 ◽  
pp. 37-45 ◽  
Author(s):  
Sujit Kumar Shah ◽  
Tulsi Prasad Niraula ◽  
Ajaya Bhattarai ◽  
Sujit Kumar Chattarjee
Keyword(s):  
Free Energy ◽  
Critical Micelle Concentration ◽  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Mixed Solvent ◽  
Specific Conductivity ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Volume Fractions ◽  
Free Energy Of Micellization

Precise measurements on the specific conductivity of cationic surfactant (Dodecyltrimethyl ammonium bromide) and anionic surfactant (Sodium Dodecyl Sulphate) in methanol water mixed solvent media containing 0.1, 0.2 and 0.3 volume fractions of methanol are reported at 308.15 K. Specific conductivities of Dodecyltrimethyl ammonium bromide and Sodium Dodecyl Sulphate increase with increase in concentration and decrease with increase in the volume fractions of methanol.  Critical micelle concentration (cmc) increases with increase in volume fraction of methanol in case of both surfactants. Free energy of micellization (ΔGºm) has been calculated. Increase in cmc with increase in volume fractions of methanol has been explained in terms of breaking of structure of water due to co-solvent effect.Keywords: Critical micelle concentration; methanol-water mixed solvent media; Specific conductivity; Dodecyltrimethylammonium Bromide; Sodiumdodecyl SulphateDOI: http://dx.doi.org/10.3126/bibechana.v8i0.4883  BIBECHANA 8 (2012) 37-45

scholarly journals Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

RSC Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 3861-3869 ◽  
Author(s):  
Zuber S. Vaid ◽  
Arvind Kumar ◽  
Omar A. El Seoud ◽  
Naved I. Malek
Keyword(s):  
Drug Delivery ◽  
Ionic Liquid ◽  
Aqueous Solutions ◽  
Cationic Surfactants ◽  
Cetyltrimethylammonium Bromide ◽  
Diclofenac Sodium ◽  
Drug Induced ◽  
P Solubilization ◽  
Micellar Aggregates ◽  
Potential Use

Solubilization of the drug diclofenac sodium (DS) in micellar aggregates of ionic liquid-based surfactants and cetyltrimethylammonium bromide at 25 °C induces changes to worm-like micelles and vesicles, with potential use in drug delivery.

scholarly journals Critical micelle concentration of sodium dodecyl sulphate in pure water and in methanol-water mixed solvent media in presence and absence of KCl by surface tension and viscosity methods

BIBECHANA ◽  
2014 ◽  
Vol 11 ◽  
pp. 103-112 ◽  
Author(s):  
Tulasi Prasad Niraula ◽  
Ajaya Bhattarai ◽  
Sujeet Kumar Chatterjee
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl Sulphate ◽  
Mixed Solvent ◽  
Pure Water ◽  
Sodium Dodecyl ◽  
Volume Fractions ◽  
Presence And Absence

Careful measurements of surface tension and viscosity of sodium dodecyl sulphate (SDS) in presence and absence of KCl in pure water and methanol-water mixed solvent media containing 0.1, 0.2, 0.3 and 0.4 volume fractions of methanol at 308.15 K are reported. The concentration of KCl is 0.01M. The concentration of SDS varies from 4.86×10-3 to 29.56×10-3 mol.l-1. The critical micelle concentration (cmc) increases with increase in percentage of methanol and decreases with addition of salt. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10388 BIBECHANA 11(1) (2014) 103-112

scholarly journals Sound Velocities and Micellar Behaviour Studies of Dodecyltrimethylammonium Bromide in Aqueous Solutions at 295.15, 302.15 and 309.15 K

2015 ◽  
Vol 7 (2) ◽  
pp. 213 ◽  
Author(s):  
Md. Harun-Al-Rashid ◽  
Tania Tofaz ◽  
M. Islam ◽  
T. Biswas
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Speed Of Sound ◽  
Acoustic Impedance ◽  
Isentropic Compressibility ◽  
Dodecyltrimethylammonium Bromide ◽  
Solvent Interactions ◽  
Speeds Of Sound ◽  
Sound Velocities

Speed of sound, u, of dodecyltrimethylammonium bromide (DTAB) aqueous solutions has been determined at 295.15, 302.15 and 309.15 K. The speeds of sound, u, data have been used to estimate isentropic compressibility, Ks, apparent molal isentropic compressibility, φk(s), acoustic impedance, Z, molal sound of speed, Rm, and relative association, RA, of DTAB in aqueous solution. These parameters have been interpreted in terms of solute-solute and solute-solvent interactions and micellar behavior of DTAB.

Controlled Growth of Sonochemically Synthesized Gold Seed Particles in Aqueous Solutions Containing Surfactants

2005 ◽  
Vol 58 (9) ◽  
pp. 667 ◽  
Author(s):  
Kenji Okitsu ◽  
Boon Mian Teo ◽  
Muthupandian Ashokkumar ◽  
Franz Grieser
Keyword(s):  
Aqueous Solutions ◽  
Cationic Surfactants ◽  
Growth Process ◽  
Hexadecyltrimethylammonium Bromide ◽  
Dodecyltrimethylammonium Bromide ◽  
Seed Particles ◽  
Didodecyldimethylammonium Bromide ◽  
Seed Growth ◽  
Gold Seed ◽  
Sonochemical Reduction

Gold seed particles stabilized by citric acid were prepared by the sonochemical reduction of Au(iii) ions in aqueous solutions. These seed particles were grown by the reduction of adsorbed Au(iii) ions by ascorbic acid in aqueous solutions containing cationic surfactants, dodecyltrimethylammonium bromide (C12TAB), hexadecyltrimethylammonium bromide (C16TAB) and didodecyldimethylammonium bromide (DDDAB). The rate of reduction of Au(iii) ions during the seed-growth process was found to be strongly dependent upon the type and concentration of the cationic surfactants. The presence of Ag(i) in the growth solution containing DDDAB affected the size distribution of the gold particles.

scholarly journals Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 743
Author(s):  
Katarzyna Szymczyk ◽  
Magdalena Szaniawska ◽  
Joanna Krawczyk
Keyword(s):  
Surface Tension ◽  
Steady State ◽  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Water Structure ◽  
Volumetric Properties ◽  
Structural Effects ◽  
Solvent Interactions ◽  
Steady State Fluorescence ◽  
Fluorescence Measurements

Density, viscosity and surface tension of Kolliphor® ELP, the nonionic surfactant aqueous solutions were measured at temperature T = 293–318 K and at 5K interval. Steady-state fluorescence measurements have been also made using pyrene as a probe. On the basis of the obtained results, a number of thermodynamic, thermo-acoustic and anharmonic parameters of the studied surfactant have been evaluated and interpreted in terms of structural effects and solute–solvent interactions. The results suggest that the molecules of studied surfactant at concentrations higher than the critical micelle concentration act as structure makers of the water structure.

scholarly journals Effective replacement of cetyltrimethylammonium bromide (CTAB) by mercaptoalkanoic acids on gold nanorod (AuNR) surfaces in aqueous solutions

Nanoscale ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 658-668 ◽  
Author(s):  
Rafael del Caño ◽  
Jose M. Gisbert-González ◽  
Jose González-Rodríguez ◽  
Guadalupe Sánchez-Obrero ◽  
Rafael Madueño ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Gold Nanorods ◽  
Ligand Exchange ◽  
Cetyltrimethylammonium Bromide ◽  
Gold Nanorod ◽  
Experimental Conditions ◽  
Seed Mediated ◽  
The Stability

The highly packed cetyltrimethylammonium bromide bilayer on the surface of gold nanorods synthesized by the seed-mediated procedure hampers the complete ligand exchange under experimental conditions that preserves the stability of the dispersions.

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