Characterization of Cationic Polyelectrolytes Adsorption to an Anionic Emulsion via Zeta‐Potential and Microcalorimetry

Li, Dongcui; Schubert, Beth; Wagner, Norman J.

doi:10.1007/s11743-013-1522-9

Cited by 9 publications

(4 citation statements)

References 46 publications

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“…In practice, the SFA measurements presented here primarily measure the interaggregate interaction energy per unit area. Indeed, accurate values of the surfactant adsorption free energies and adsorption profiles to hydrophobic and hydrophilic surfaces, − combined with surface forces studies, would account for both the intra- and interaggregate interactions to fully characterize an emulsion’s phase behavior. Given the hydrophobic backbone of bq5x-PDMS, we hypothesize that the polyelectrolyte adsorbs to oil–water interfaces with an adsorption free energy that is larger (more favorable) than the adsorption of more hydrophilic polyelectrolytes. − …”

Section: Discussionmentioning

confidence: 99%

Effects of Surfactants and Polyelectrolytes on the Interaction between a Negatively Charged Surface and a Hydrophobic Polymer Surface

et al. 2015

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ABSTRACT:We have measured and characterized how three classes of surface-active molecules self-assemble at, and modulate the interfacial forces between, a negatively charged mica surface and a hydrophobic end-grafted polydimethylsiloxane (PDMS) polymer surface in solution. We provide a broad overview of how chemical and structural properties of surfactant molecules result in different self-assembled structures at polymer and mineral surfaces, by studying three characteristic surfactants: (1) an anionic aliphatic surfactant, sodium dodecyl sulfate (SDS), (2) a cationic aliphatic surfactant, myristyltrimethylammonium bromide (MTAB), and (3) a silicone polyelectrolyte with a long-chain PDMS midblock and multiple cationic end groups. Through surface forces apparatus measurements, we show that the separate addition of three surfactants can result in interaction energies ranging from fully attractive to fully repulsive. Specifically, SDS adsorbs at the PDMS surface as a monolayer and modifies the monotonic electrostatic repulsion to a mica surface. MTAB adsorbs at both the PDMS (as a monolayer) and the mica surface (as a monolayer or bilayer), resulting in concentration-dependent interactions, including a long-range electrostatic repulsion, a shortrange steric hydration repulsion, and a short-range hydrophobic attraction. The cationic polyelectrolyte adsorbs as a monolayer on the PDMS and causes a long-range electrostatic attraction to mica, which can be modulated to a monotonic repulsion upon further addition of SDS. Therefore, through judicious selection of surfactants, we show how to modify the magnitude and sign of the interaction energy at different separation distances between hydrophobic and hydrophilic surfaces, which govern the static and kinetic stability of colloidal dispersions. Additionally, we demonstrate how the charge density of silicone polyelectrolytes modifies both their self-assembly at polymer interfaces and the robust adhesion of thin PDMS films to target surfaces.

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Section: Discussionmentioning

confidence: 99%

Effects of Surfactants and Polyelectrolytes on the Interaction between a Negatively Charged Surface and a Hydrophobic Polymer Surface

et al. 2015

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“…carried out a study on the influence of cations and ions on the adsorption of high‐molecular‐weight nonionic polyacrylamide (PAM) on the surface of glass. Li et al . investigated the ζ potential of HPAM in the presence of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of new hydrophobic polyacrylamide on the calcite surface

Wang

et al. 2017

J of Applied Polymer Sci

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A hydrophobic polyacrylamide (HPAM) was synthesized by aqueous free-radical chain polymerization to understand the adsorption action of the polymer on the calcite during operating stimulation. The polymer was designed as acrylamide (AM)/2-acrylamide-2-methylpropanesulfonic acid (AMPS)/2-methacryloyloxyethyl 12-alkyl dimethyl ammonium bromide (MADA). The structure of the polymer was characterized by Fourier transform infrared spectroscopy. The adsorption properties of the polyacrylamide onto pure calcite was investigated. When we compared the f potentials of the calcite particles in the presence and absence of HPAM, the adsorbed amount was affected by different factors, and the adsorption behaviors were examined to determine the adsorption layer. The results of the f potential measurements indicated that the particles were negatively charged between pHs of 6 and 12, and the presence of HPAM did not reverse that. Equilibrium adsorption studies showed that the adsorbed amount was affected by the concentration of HPAM, liquid-to-solid ratio, calcite particle size, concentration of background ions, and temperature, which were related the adsorption behaviors of HPAM. Hydrogen bonds between HPAM and calcite were important because the adsorbed amount was significantly reduced when the hydrogen bonds were broken by urea. It is necessary to develop a more active reagent that can break the hydrogen bonds and improve the effect of hydraulic fracturing.

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“…These PSCs are of particular technological interest because of their appealing supramolecular structures (e.g., gels, ,− liquid crystals, ,− solid precipitates , ) and unique properties (e.g., gelation, ,− tackiness, , biodegradability, rheological and interfacial activity , ). One major application is for encapsulation of active hydrophobic compounds (e.g., antibacterial agents, drugs, , functional oils ,, ), where these PSCs are formulated to achieve targeted storage, delivery, and controlled release. Such complex formulations must satisfy numerous criteria, and thus, there is significant interest in finding superior model systems as well as developing methods for their rational design. − The complexation behavior generally depends on external solution properties , (e.g., pH, temperature, solvent polarity, ionic strength, etc.)…”

Section: Introductionmentioning

confidence: 99%

Universal Binding Behavior for Ionic Alkyl Surfactants with Oppositely Charged Polyelectrolytes

Wagner

2013

J. Am. Chem. Soc.

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Oppositely charged polyelectrolyte-surfactant mixtures are ubiquitous in biology and the basis of numerous consumer healthcare products. Despite their broad use, however, a rational approach to their formulation remains challenging because of the complicated association mechanisms. Through compilation and analysis of literature reports and our own research, we have developed a semiempirical correlation of the binding strength of surfactants to polyelectrolytes in salt-free mixtures as a function of the polyion linear charge density and the surfactant hydrophobicity. We have found that the cooperative binding strength increases as the square of the polyelectrolyte's linear charge density and in proportion to the surfactant's hydrophobicity, such that a quantitative relationship holds across a broad range of polyelectrolytes. Deviations from the correlation reveal the role of system-specific interactions not considered in the analysis. This engineering relationship aids in the rational design of oppositely charged polyelectrolyte-surfactant formulations for consumer products and biomedicines by enabling the prediction of binding strengths in polyelectrolyte-surfactant mixtures based on mesoscale parameters determined from the chemical composition.

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Characterization of Cationic Polyelectrolytes Adsorption to an Anionic Emulsion via Zeta‐Potential and Microcalorimetry

Cited by 9 publications

References 46 publications

Effects of Surfactants and Polyelectrolytes on the Interaction between a Negatively Charged Surface and a Hydrophobic Polymer Surface

Effects of Surfactants and Polyelectrolytes on the Interaction between a Negatively Charged Surface and a Hydrophobic Polymer Surface

Adsorption of new hydrophobic polyacrylamide on the calcite surface

Universal Binding Behavior for Ionic Alkyl Surfactants with Oppositely Charged Polyelectrolytes

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