pH-dependent polyampholyte SDS interactions

Fechner, Mabya; Kosmella, Sabine; Koetz, Joachim

doi:10.1016/j.jcis.2010.01.092

Cited by 17 publications

(18 citation statements)

References 63 publications

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“…Whereas at high pH the strong interaction between the SDS and PEI takes the form of a short ranged ion-dipole interaction between the sulfate headgroup and the amine nitrogen with an additional cooperative hydrophobic interaction between the alkyl chains of the attached surfactants [21]. Recently Fechner et al [46] have made broadly similar conclusions in their study of the pH dependent SDS-polyampholyte interactions. However they associated the change from electrostatic to hydrophobic interaction with increasing pH with a change in the polymer conformation.…”

Section: Discussionmentioning

confidence: 88%

The effects of the addition of the polyelectrolyte, poly(ethyleneimine), on the adsorption of mixed surfactants of sodium dodecylsulfate and dodecyldimethylaminoacetate at the air–water interface

Zhang

Taylor

Thomas

et al. 2011

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 88%

The effects of the addition of the polyelectrolyte, poly(ethyleneimine), on the adsorption of mixed surfactants of sodium dodecylsulfate and dodecyldimethylaminoacetate at the air–water interface

Zhang

Taylor

Thomas

et al. 2011

Journal of Colloid and Interface Science

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“…Substantial efforts have been made to clarify the formation, properties, and structures of PSCs [22][23][24] with theoretical studies [25][26][27] and many experimental studies concerning the incorporation of polyelectrolytes in diluted solutions [11,28] microemulsions [29], solid state [8,30,31], or liquid crystalline systems [32]. More specifically, the incorporation of an oppositely charged polyelectrolyte in a lamellar lyotropic system has been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Nonstoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium

2012

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The addition of a polyelectrolyte to lamellar media formed by an oppositely charged surfactant often leads to the coexistence of several phases without macroscopic phase separation, which makes their characterization difficult. Here, the effect of the polydiallyldimethylammonium chloride (PD) on the lamellar liquid crystal formed by the anionic surfactant Aerosol OT (AOT) and water is investigated. Small-angle X-ray scattering results are discussed regarding the changes in the lamellar spacing as a function on the PD or AOT concentrations. In most of the samples, two lamellar phases, without macroscopic phase separation, are detected. One of them is a typical swollen phase, while the other is a collapsed phase, which corresponds to the polymer-surfactant complex. At concentrations of polymer up to 3 wt%, the two lamellar phases coexist; however, at a critical concentration higher than 3 wt%, the swollen phase becomes isotropic, and a macroscopic phase separation takes place. A simple model is proposed to calculate the composition of the phases when macroscopic phase separation does not occur. The results thus calculated show that generally the polymer-surfactant complexes are nonstoichiometric containing a lesser amount of polymer than ideally expected.

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“…The Δ H of the physical bonds such as the van der Waals forces and hydrogen bonds between asphaltenes and C5PeC11 was from −1.5 to −0.3 kJ/mol . The Δ H values of hydrophobic binding and electrostatic interactions between SDS and polyelectrolyte were 2.9 kJ mol –1 (pH = 9) and 4.9 kJ mol –1 (pH = 4), respectively . Only a few studies have investigated the electrostatic or hydrophobic interactions between particles and molecules.…”

Section: Resultsmentioning

confidence: 99%

“…50 The ΔH values of hydrophobic binding and electrostatic interactions between SDS and polyelectrolyte were 2.9 kJ mol −1 (pH = 9) and 4.9 kJ mol −1 (pH = 4), respectively. 51 Only a few studies have investigated the electrostatic or hydrophobic interactions between particles and molecules. Here, we quantified the electrostatic interactions between M@NH 2 and surfactants at the molecular level using ITC.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Recyclable Functional Magnetic Nanoparticles for Fast Demulsification of Waste Metalworking Emulsions Driven by Electrostatic Interactions

Peng

Xiong

Liu

et al. 2018

ACS Sustainable Chem. Eng.

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Complex multiphase waste metalworking emulsions, which contain large amounts of surfactants and mineral oil, are difficult to treat efficiently by traditional molecular demulsifiers. We synthesized one type of functionalized magnetic nanoparticles grafted with amino groups (M@NH2) to treat waste metalworking emulsions from different mechanical processing factories and investigated the demulsification mechanism. The M@NH2 showed an excellent demulsification performance, achieving 85–97% chemical oxygen demand (COD) removal for most of the waste metalworking emulsions. The results indicated the advantage of the three-step demulsification process (adsorption of M@NH2 on droplets, droplet coalescence, and the magnetic transfer of droplets in the magnetic field) over traditional two-step demulsification (adsorption of MNPs on droplets and the transfer of droplets in the magnetic field). In addition, electrostatic interactions between M@NH2 and surfactants were confirmed as the driving force of demulsification. Isothermal titration calorimeter quantified the interactions at the molecular level; the enthalpy was 1.83 kJ/mol, affinity coefficient between M@NH2 and the surfactant was 1.5 × 103, and the stoichiometric number of the surfactant and M@NH2 was 11.5. This research provides a new perspective for the treatment of waste metalworking emulsions.

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pH-dependent polyampholyte SDS interactions

Cited by 17 publications

References 63 publications

The effects of the addition of the polyelectrolyte, poly(ethyleneimine), on the adsorption of mixed surfactants of sodium dodecylsulfate and dodecyldimethylaminoacetate at the air–water interface

The effects of the addition of the polyelectrolyte, poly(ethyleneimine), on the adsorption of mixed surfactants of sodium dodecylsulfate and dodecyldimethylaminoacetate at the air–water interface

Nonstoichiometric polymer-surfactant complexes obtained in a lamellar lyotropic medium

Recyclable Functional Magnetic Nanoparticles for Fast Demulsification of Waste Metalworking Emulsions Driven by Electrostatic Interactions

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