The influence of sodium salicylate on the micellar rate effect and the structural behaviour of dodecylpyridinium bromide micelles

Zakharova, L. Ya.; Kudryavtsev, D. B.; Kudryavtseva, L. A.; Коновалов, А. И.; Zuev, Yury F.; Vylegzhanina, N. N.; Zakharchenko, N. L.; Idiatullin, Zyamil Sh.

doi:10.1070/mc1999v009n06abeh001182

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…Therefore, it was of interest to carry out a similar study in the presence of a polyelectrolyte. According to the previously developed methodology, 33 we analyzed the kinetic plots in the semi logarithmic coordinates k app -logC PEI at three fixed SDS concentrations in the interval below and above the CMC. The reactivity of substrate 1 changed dramatically at 0.007-0.008 mol L -1 PEI (Fig.…”

Section: Resultsmentioning

confidence: 99%

Sodium dodecyl sulfate—polyethyleneimine—water system. Self-organization and catalytic activity

et al. 2005

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Concentration boundaries within which polymer-colloid structures exist in a sodium dodecyl sulfate-polyethyleneimine-water system were determined. The catalytic effect of this composition was found for the hydrolysis of phosphonic acid esters. The found accelera tion of hydrolysis up to 25 fold is caused by reagent concentrating in a catalytic complex.Mixed systems surfactant-polymer are objects of a promising interdisciplinary scientific area that attract great researchers´ interest. 1-6 The development of this avenue of investigation is stimulated by a wide scope of practi cally useful properties of mixed solutions and a possibility of their purposeful control by the variation of the compo nent ratio in the system. In addition, the study of regulari ties of the formation of polymolecular ensembles extends potentialities of self assembly modelling in biological sys tems. The main goal of fundamental studies of aqueous surfactant-polymer solutions is to prove the combined aggregation, find concentration boundaries for the exist ence of mixed structures, estimate their stability, and char acterize the nature of intermolecular interactions. The reactivity of compounds in mixed polymer-colloid sys tems is poorly studied and, therefore, is one of the main tasks of the present work.We have previously 7,8 studied the physical and cata lytic properties of polymer-colloid systems based on the cationic surfactant cetyltrimethylammonium bromide (CTAB) and polyethyleneimine (PEI). Different points of view about the possible cooperative binding of cationic surfactants with nonionic and likely charged polymers can be found in the literature. 9 The published results 7,8 favor the hypothesis on the self organization and forma tion of supramolecular structures in the CTAB-PEI sys tem. These structures efficiently catalyze the hydrolysis of phosphorus esters. Taking into account that the electro static interaction contributes unfavorably to the free en ergy of formation of complexes of the likely charged sur factant and polymeric species, it should be assumed that combined aggregates are formed in these systems mainly due to hydrophobic interactions. To gain more compre hensive information on the contribution from differ ent types of intermolecular interactions in the surfac tant-polymer systems, we continued to study the cata lytic properties of PEI based compositions, using an un likely charged surfactant, sodium dodecyl sulfate (SDS). The hydrolysis of phosphonates 1-3 was studied as a model process (Scheme 1). Scheme 1 1 2 3 X NO 2 NO 2 Br R Et n С 6 Н 13 Et ExperimentalCompounds 1-3 were synthesized by a known procedure. 10 Sodium dodecyl sulfate (Sigma) and branched PEI (Aldrich, molecular weight 30000) containing the primary, secondary, and tertiary nitrogen atoms in a ratio of 1 : 2 : 1 were used. Molar concentrations of PEI presented in the work are based on the

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Section: Resultsmentioning

confidence: 99%

Sodium dodecyl sulfate—polyethyleneimine—water system. Self-organization and catalytic activity

et al. 2005

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“…For the CTAB concentration in the range of 0.01−0.08 kmol/m 3 , the cell radius varies from 13.35 to 7.19 nm. In the absence of electrolytes, the experimentally determined surface potential of CTAB micelle, ψ o , is 130–140 mV 35,36 . In this work, the computation of NPB was carried out with a boundary condition of surface potential ψ o at r = r m .…”

Section: Theory Of Distribution Of Ions and Bimolecular Ionic Reactio...mentioning

confidence: 99%

“…In the absence of electrolytes, the experimentally determined surface potential of CTAB micelle, ψ o , is 130-140 mV. 35,36 In this work, the computation of NPB was carried out with a boundary condition of surface potential ψ o at r = r m . The Poisson-Boltzmann equation considers the ions as spherical particles.…”

Section: Npb Equation-based Model For the Charge Distributionmentioning

confidence: 99%

Modeling of micellar‐catalyzed bimolecular ionic reactions by a nonlinear Poisson−Boltzmann equation and an electrostatic free energy model

Karmakar

Jana

2023

Int J of Chemical Kinetics

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The hydrolysis reactions of crystal violet (CV) and p‐nitrophenyl acetate (PNPA) by sodium hydroxide in cetyltrimethylammonium bromide (CTAB) micellar solution were studied in this work. Combined with the Boltzmann probability of ionic species in an electrostatic potential field, a model with a numerical scheme was developed based on the nonlinear Poisson−Boltzmann equation in the micelle‐cell consisting of the reactants and the surfactant. The numerical solution gives the ionic species distribution in the micelle phase and the radius of the micelle‐phase. The dielectric constant of the micelle‐phase varies in the range of 39.8−54.4. The second‐order reaction rate constants in the micelle‐phase were determined using the electrostatic and dipolar free energy models. For the basic hydrolysis of CV and PNPA, the overall second‐order rate constants are three to five times and 1.4 times greater than the corresponding values in water, respectively. The rate enhancement occurs due to the distribution of the reactive ionic species in the cell region and the enhancement of the Coulombic and dipolar interactions among the ionic and polar reactants.

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Structural Factors in Micellar Catalysis: NMR Self-Diffusion Study

Zuev

Idiyatullin

Fedotov

et al. 2002

Magnetic Resonance in Colloid and Interface Science

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The influence of sodium salicylate on the micellar rate effect and the structural behaviour of dodecylpyridinium bromide micelles

Cited by 11 publications

References 13 publications

Sodium dodecyl sulfate—polyethyleneimine—water system. Self-organization and catalytic activity

Sodium dodecyl sulfate—polyethyleneimine—water system. Self-organization and catalytic activity

Modeling of micellar‐catalyzed bimolecular ionic reactions by a nonlinear Poisson−Boltzmann equation and an electrostatic free energy model

Structural Factors in Micellar Catalysis: NMR Self-Diffusion Study

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