Salt effect on the interactions between gemini surfactant and oppositely charged polyelectrolyte in aqueous solution

Pi, Yingying; Shang, Yazhuo; Liu, Honglai; Hu, Ying; Jiang, Jianwen

doi:10.1016/j.jcis.2006.10.020

Cited by 33 publications

(16 citation statements)

References 27 publications

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“…Obviously, the less-ordered, wormhole-like mesopores in the shell were templated by the CTA micelles, and this indicates that the well-ordered Pm 3̅ n mesostructure of the PAA–CTA complex collapsed after the addition of other reactants. In other studies of polyelectrolyte/surfactant complexes, it has been shown that the addition of salts reduces the strength of electrostatic interaction between surfactants and polyelectrolytes, and could even completely screen the electrostatic interaction and result in partial or complete dissociation of the polyelectrolyte/surfactant complexes. − Here in our case, the Na + and TPA + competed with the CTA surfactant to interact with PAA, and this considerably decreased the amount of surfactants bound to the polyelectrolyte and resulted in dissociation of the mesostructured PAA/CTA complexes. Then the ordered PAA/CTA complexes dissociated and evolved to CTA-coated PAA complexes.…”

Section: Resultsmentioning

confidence: 59%

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Liu

Wang

et al. 2012

Langmuir

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Mesoporous zeolite silicalite-1 and Al-ZSM-5 with intracrystalline mesopores were synthesized with polyelectrolyte-surfactant complex as the template. Complex colloids were first formed by self-assembly of the anionic polymer poly(acrylic acid) (PAA) and the cationic surfactant cetyltrimethylammonium bromide (CTAB) in basic solution. During the synthesis procedure, upon the addition of the silica source, microporous template (tetrapropylammonium hydroxide), and NaCl, these PAA/CTA complex colloids underwent dissociation and gave rise to the formation of hollow silica spheres with mesoporous shells templated by CTAB micelles and PAA domains as the core. Under hydrothermal treatment, the hollow silica spheres gradually merged together to form larger particles with the PAA domains embedded as the space occupant, which acted as a template for intracrystalline mesopores during the crystallization of the zeolite framework. Amphiphilic organosilane was used to enhance the connection between the PAA domain and the silica phase during the synthesis. After calcination, single crystal-like zeolite particles with intracrystalline mesopores of about 5-20 nm were obtained, as characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and N(2) adsorption measurements. With the addition of an aluminum source in the synthesis, mesoporous zeolite Al-ZSM-5 with intracrystalline mesopores was also synthesized, and enhanced catalytic property was observed with mesoporous Al-ZSM-5 in acetalization of cyclohexanone with methanol.

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Section: Resultsmentioning

confidence: 59%

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Liu

Wang

et al. 2012

Langmuir

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“…Standard enthalpy change has been determined by using Equation (4). [23] DH 0 ¼ Àð2 À a 1 ÞRT 2 ½@lnðcacÞ=DT: ½4…”

Section: Resultsmentioning

confidence: 99%

“…Ionic surfactants interact much more strongly than nonionic surfactants with nonionic polymers. [4] In fact, anionic surfactans have a higher affinity for nonionic polymers than cationic surfactants. [5,6] The interaction between ionic surfactants and oppositely charged polymers is dominated by long-range coulombic interaction at low range of surfactant concentrations and hydrophobic interaction at high range of surfactant concentrations.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamıc Studıes of Interactıon Between CTAB and Carboxymethylcellulose Usıng Different Techniques

Bayrak¹,

Tüfekçi²

2013

Journal of Dispersion Science and Technology

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Mixtures of carboxymethyl cellulose (carboxyMC) and cethyltrimethyl ammonium bromide (CTAB) were investigated using surface tension, specific conductivity and density measurements. The parameters of the surfactant to polymer association processes such as the critical aggregation concentration (cac) and the polymer saturation point (psp) were determined from the plots of surface tension, specific conductivity and density versus surfactant concentration. The thermodynamic parameters of polymer-surfactant interaction were calculated at different temperatures. The results showed that the standard Gibbs free energy ðDG 0 psi Þ, the enthalpy ðDH 0 psi Þ and the entropy ðDS 0 psi Þ of the aggregation process were found negative in all cases.

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“…14,15 Recently, the understanding of the effect of multivalent cations on structure formation in polyelectrolyte solutions has significantly progressed, owing to advances in the field of molecular dynamics simulations. [15][16][17][18][19] It has been shown, for instance, that in these systems, a net attractive interaction occurs between like charged macroions and that the charged molecules can attract each other due to charge fluctuations in the counter-ion distribution. 20,21 Under certain circumstances, ordered structures appear.…”

Section: Introductionmentioning

confidence: 99%

Ionic effects in semi-dilute biopolymer solutions: A small angle scattering study

Horkay

Basser

Hecht

et al. 2018

The Journal of Chemical Physics

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Systematic investigations using neutron and X-ray small angle scattering in near-physiological salt solutions were made to reveal the effect of polymer concentration, pH, and calcium ion concentration on the structure of semi-dilute solutions of four model biopolymers [polyaspartic acid, DNA, chondroitin sulfate, and hyaluronic acid (HA)] representing typical backbone structures. In the low q range (<0.01 Å −1), the scattering response I(q) is dominated by scattering from large clusters. In the intermediate q range, I(q) varies approximately as q −1 , exposing the linear nature of the scatterers. In these polyelectrolyte solutions, the correlation length L displays a power law dependence on the polymer concentration c that resembles that of neutral polymer solutions. L increases with increasing calcium chloride concentration and with decreasing pH. The effect of the different divalent cations, Ba, Mg, Ca, Sr, and Mn, on the structure of DNA solutions is practically identical. However, in mixed salt conditions at the same ionic strength, the combined effect of mono-and divalent counter-ions on the structure of the polymer solutions deviates significantly from additivity. Anomalous small angle X-ray scattering observations on both DNA and HA solutions reveal that the divalent strontium counter-ions form a tight sheath around the polymer chain. The shape of the divalent ion cloud is similar in these two systems.

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Salt effect on the interactions between gemini surfactant and oppositely charged polyelectrolyte in aqueous solution

Cited by 33 publications

References 27 publications

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Polyelectrolyte–Surfactant Complex as a Template for the Synthesis of Zeolites with Intracrystalline Mesopores

Thermodynamıc Studıes of Interactıon Between CTAB and Carboxymethylcellulose Usıng Different Techniques

Ionic effects in semi-dilute biopolymer solutions: A small angle scattering study

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