Study of surfactant-polyelectrolyte interactions. 2. Effect of multivalent counterions on the binding of dodecyltrimethylammonium ions by sodium dextran sulfate and sodium poly(styrene sulfonate) in aqueous solution

Hayakawa, Kou; Kwak, Jan C. T.

doi:10.1021/j100226a026

Cited by 172 publications

(112 citation statements)

References 3 publications

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“…These observations were in contrast to the suggestions of Hayakawat and Kwak, 44 who showed that cations of higher valence interfered more with polyelectrolyte-surfactant binding than the cations of lower valence. One possible explanation for the current observations was that even though the PEI/SDS PECs were positively charged, once the Debye layer was screened, the cations could diffuse into the PEC system and interact with either the PEI shell or SDS micelles entrapped in the PEC or both; this led to particle swelling and precipitation.…”

Section: Articlecontrasting

confidence: 82%

Effects of monovalent and multivalent ions on the stability of a polyelectrolyte complex with entrapped surfactants

Gao

Chowdhury

Liang

et al. 2015

J of Applied Polymer Sci

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In this article, we report the effects of nine different monovalent and multivalent salts on the particle size and stability of refined, positively charged polyelectrolyte complexes (PECs) with entrapped surfactant. Dynamic light scattering and f potential measurements of these polymeric particles as a function of various salt concentrations showed that both counter ions and co-ions induced a concentration-dependent increase in the particle size and a decrease in the f potential. We found that the anion concentration where the particle size doubled and the maximum anion concentration beyond which particle precipitation occurred (C a,max ) demonstrated a power law dependence on the anion valence. Moreover, for anions of the same valence but different hydration radio, C a,max decreased in the following order: NO 3 ! Cl ! HPO 4 22 > SO 4 22 > PO 4 32. However, unlike the case of hard colloids where co-ions have relatively little effect on particle interactions, the co-ions also increased the hydrodynamic radii of our PECs in the following order:. Furthermore, we found that the entrapped surfactants were shielded from the adverse effect of multivalent ions; this established that the monovalent and multivalent ions interacted with the polyelectrolyte shells of the PEC. This behavior was in contrast with the effect of salts on mixtures containing the polyelectrolyte and surfactant components, where the addition of salts typically causes an interaction with the individual components. Because several biomedical and technological applications involving PECs require saline environments, our studies provide insight into how small ions influence the PEC stability in applications involving varying salinities.

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Section: Articlecontrasting

confidence: 82%

Effects of monovalent and multivalent ions on the stability of a polyelectrolyte complex with entrapped surfactants

Gao

Chowdhury

Liang

et al. 2015

J of Applied Polymer Sci

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“…The interaction between polymers and surfactants is of great practical importance in areas as diverse as colloidal stabilization, polymer solubilization, mineral flotation and flocculation, as well as various aspects of molecular biology and biochemistry [5]. In many practical applications the polymers are dissolved in some sort of polar solvent, typically water, leading to monomer ionization.…”

Section: Introductionmentioning

confidence: 99%

Complex formation between polyelectrolytes and ionic surfactants

Kuhn

Levin

Barbosa

1998

Chemical Physics Letters

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The interaction between polyelectrolyte and ionic surfactant is of great importance in different areas of chemistry and biology. In this paper we present a theory of polyelectrolyte ionic-surfactant solutions. The new theory successfully explains the cooperative transition observed experimentally, in which the condensed counterions are replaced by ionic-surfactants. The transition is found to occur at surfactant densities much lower than those for a similar transition in non-ionic polymersurfactant solutions. Possible application of DNA surfactant complex formation to polynucleotide delivery systems is also mentioned.

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“…This was determined by potentiometric titration (by using a surfactant-selective electrode to determine free-surfactant concentrations) according to the standard methods for the determination of binding isotherms for polyelectrolyte and surfactant interactions, as detailed in references [15] and [16]. b is defined, here in the case of oligoelectrolytic dye molecules, as the fraction of the total charged sites (from the dye) occupied by bound surfactants.…”

Section: Resultsmentioning

confidence: 99%

“…[13,14] It is well known from the literature (from the determination of binding isotherms) [15,16] that the complexes are formed in a highly cooperative way.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Optically Functional, Highly Organized Nanostructures: Dye–Surfactant Complexes

Faul

Antonietti

2002

Chem. Eur. J.

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Pulsed Laser Deposition (PLD) was used to prepare thin films with the nominal composition La0.58Sr0.4Co0.2Fe0.8O3‐δ (LSCF). The thin film microstructure was investigated as a function of PLD deposition parameters such as: substrate temperature, ambient gas pressure, target‐to‐substrate distance, laser fluence and frequency. It was found that the ambient gas pressure and the substrate temperature are the key PLD process parameters determining the thin film micro‐ and nanostructure. A map of the LSCF film nanostructures is presented as a function of substrate temperature (25–700 °C) and oxygen background pressure (0.013–0.4 mbar), with film structures ranging from fully dense to highly porous. Fully crystalline, dense, and crack‐free LSCF films with a thickness of 300 nm were obtained at an oxygen pressure lower than 0.13 mbar at a temperature of 600 °C. The obtained knowledge on the structure allows for tailoring of perovskite thin film nanostructure, e.g., for solid oxide fuel cell cathodes. A simple geometrical model is proposed, allowing estimation of the catalytic active surface area of the prepared thin films. It is shown that voids at columnar grain boundaries can result in an increase of the surface area by approximately 25 times, when compared to dense flat films.

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Study of surfactant-polyelectrolyte interactions. 2. Effect of multivalent counterions on the binding of dodecyltrimethylammonium ions by sodium dextran sulfate and sodium poly(styrene sulfonate) in aqueous solution

Cited by 172 publications

References 3 publications

Effects of monovalent and multivalent ions on the stability of a polyelectrolyte complex with entrapped surfactants

Effects of monovalent and multivalent ions on the stability of a polyelectrolyte complex with entrapped surfactants

Complex formation between polyelectrolytes and ionic surfactants

Facile Synthesis of Optically Functional, Highly Organized Nanostructures: Dye–Surfactant Complexes

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