Micellar catalysis in mixed anionic/cationic surfactant systems

Dye solubility and stopped-flow kinetic studies were conducted in sodium dodecylsulfate/dodecyltrimethylammonium bromide and sodium dodecylsulfate/decyltrimethylammonium bromide micellar solutions with excess anionic surfactant. The enhanced rate in the presence of anionic micelles of the Ni2+(aq)/pyridine-2-azo-p-dimethylaniline (PADA) complexation reaction was used as a probe of the mixed micellar situation. PADA solubilities and the kinetic parameters derived through the Robinson model for micellar catalysis were consistent with a complete incorporation of the cationic surfactant into the sodium dodecylsulfate micelles.

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Electron spin echo modulation and electron spin resonance studies of sodium dodecylsulfate and dodecyltrimethylammonium bromide micellar solutions: Effect of urea addition

Trends in Colloid and Interface Science V - Progress in Colloid & Polymer Science ◽

10.1007/bfb0115933 ◽

2007 ◽

pp. 55-60 ◽

Cited By ~ 7

Author(s):

P. Baglioni ◽

L. Dei ◽

E. Ferroni ◽

L. Kevan

Keyword(s):

Electron Spin Resonance ◽

Electron Spin ◽

Spin Echo ◽

Sodium Dodecylsulfate ◽

Electron Spin Echo ◽

Dodecyltrimethylammonium Bromide ◽

Micellar Solutions ◽

Spin Resonance ◽

Urea Addition ◽

Electron Spin Echo Modulation

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The Phosphate Content of Escherichia coli Alkaline Phosphatase and Its Effect on Stopped Flow Kinetic Studies

Journal of Biological Chemistry ◽

10.1016/s0021-9258(19)43574-6 ◽

1973 ◽

Vol 248 (16) ◽

pp. 5794-5805

Author(s):

Will Bloch ◽

Milton J. Schlesinger

Keyword(s):

Escherichia Coli ◽

Alkaline Phosphatase ◽

Kinetic Studies ◽

Stopped Flow ◽

Phosphate Content

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Self-assembly of sodium dodecylsulfate and dodecyltrimethylammonium bromide mixed surfactants with dyes in aqueous mixtures

Royal Society Open Science ◽

10.1098/rsos.181979 ◽

2019 ◽

Vol 6 (3) ◽

pp. 181979 ◽

Cited By ~ 20

Author(s):

K. M. Sachin ◽

Sameer A. Karpe ◽

Man Singh ◽

Ajaya Bhattarai

Keyword(s):

Surface Tension ◽

Self Assembly ◽

Sodium Dodecylsulfate ◽

Critical Micellar Concentration ◽

Aqueous System ◽

Mixed Surfactants ◽

Dodecyltrimethylammonium Bromide ◽

Aqueous Mixtures ◽

Krafft Temperature ◽

Vis Spectroscopy

The micellar property of mixed surfactant systems, cationic (dodecyltrimethylammonium bromide, DTAB) and anionic (sodium dodecylsulfate, SDS) surfactants with variable molar ratios in aqueous system has been reported by using surface tension and conductivity measurements at T = 293.15, 298.15 and 303.15 K. DTAB concentrations are varied from 1.0 × 10 −4 to 3 × 10 −4 mol l −1 in 1.0 × 10 −2 mol l −1 SDS solution while the SDS concentration is varied from 1.0 × 10 −3 to 1.5 × 10 −2 mol l −1 in approximately 5.0 × 10 −3 mol l −1 DTAB, so that such concentrations of DTAB-SDS (DTAB-rich) and SDS-DTAB (SDS-rich) solutions were chosen 3 : 1 ratio. The critical micellar concentration, as well as surface and thermodynamic properties for DTAB-rich and SDS-rich solutions, were evaluated by the surface tension ( γ ) and conductivity ( κ ) methods. The pseudo phase separation model was coupled with the dissociated Margules model for synergism. The Krafft temperature behaviour and optical analysis of mixed surfactants are studied using conductivity and UV–Vis spectroscopy, respectively. The dispersibility and stability of DTAB-rich and SDS-rich solutions with and without dyes (2.5 × 10 −5 mol l −1 of methyl orange and methylene blue) are carried out by using UV–Vis spectroscopy and dynamic light scattering.

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