Polymer—surfactant interaction part II. Polymer and surfactant of opposite charge

Goddard, E. D.

doi:10.1016/0166-6622(86)80341-9

Cited by 533 publications

(426 citation statements)

References 62 publications

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“…Progressively, the surfactant solution became turbid, indicating the formation of complexes. 40 They were collected after removal of water from the centrifugated complex-water dispersion. In order to remove possible excess of unbound surfactant in the PG1-C8 to PG3-C8, PG1-C12 to PG3-C12, and PG1-C14 to PG3-C14, the collected precipitates were successively dissolved in 1-butanol and added dropwise to large excess of acidic water (pH ) 3-4) in order to avoid 1-butanol emulsification in water.…”

Section: Methods Complexation and Purificationmentioning

confidence: 99%

Comblike Liquid-Crystalline Polymers from Ionic Complexation of Dendronized Polymers and Lipids

et al. 2007

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This work describes the self-assembly behavior, the structure, the state, and phase diagrams of comblike liquid-crystalline polymers obtained by supramolecular ionic complexation of cationic dendronized polymers (PG1-PG3) and anionic sulfonated lipid surfactants. In order to characterize the influence of both the polymer and the surfactant on the microphase separation of these complexes, dendronized polymers with generation 1 e n e 3, carrying 2 n positive charges per monomer, were complexed with a stoichiometric amount of anionic sodium alkyl monosulfate surfactants with hydrocarbon chain of C 8 , C 12 , C 14 , and C 18 lengths. Supramolecular complexes were obtained in water, and the complexation process was monitored by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance. After drying and thermal annealing under high vacuum, the complexes showed thermotropic liquid-crystalline behavior as demonstrated by both cross-polarized optical microscopy and differential scanning calorimetry. Small-angle X-ray scattering allowed determining the respective lattice parameters and type of structures for all the complexes considered. Depending on both generation and lipid chain length, amorphous isotropic fluid, columnar rectangular, columnar hexagonal, columnar tetragonal, and lamellar phases were observed, each characterized by a specific order-disorder transition temperature (T ODT ).

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Section: Methods Complexation and Purificationmentioning

confidence: 99%

Comblike Liquid-Crystalline Polymers from Ionic Complexation of Dendronized Polymers and Lipids

et al. 2007

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“…Electrostatic forces dominate this interaction, although hydrophobic forces may play a secondary role. [5][6][7] The latter case (b) is probably best exemplified by the system involving poly(ethylene oxide) (PEO) and sodium dodecyl sulfate (SDS) above the CMC; here, the debate about the nature of the attractive force has included the reduction of interfacial energy between the hydrocarbon core and the local solvent medium, [8][9][10] the association between the ethylene group of PEO and the aliphatic part of micelles, 11 and the role of the cationic counterion in the stabilization of the complex. 12 These arguments indicate the difficulty in reaching definitive conclusions on this system.…”

Section: Introductionmentioning

confidence: 99%

Binding of Cationic Mixed Micelles to Pyrene-Labeled Poly((acrylamido)-2-methylpropanesulfonate)

et al. 1997

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The interaction between pyrene-labeled poly(acrylamido)-2-methylpropane sulfonate) (PyPAMPS) and mixed micelles of n-dodecylhexaoxyethylene glycol monoether/n-hexadecyltrimethylammonium chloride (C12E6/CTAC) was studied by turbidimetry, quasielastic light scattering (QELS), fluorescence quenching, and UV spectroscopy. The present report focuses on the effect of the pyrene label on the polymer-micelle interaction. With nonlabeled PAMPS, we observe by turbidity and QELS a critical mole fraction of ionic surfactant (Yc) corresponding to the onset of polyelectrolyte-micelle interaction. The same Yc is observed by turbidity and QELS for PyPAMPS. However, PyPAMPS shows a lower additional transition by the same methods, which we refer to as "Yc1" to distinguish it from "Yc2" which is seen for both PAMPS and PyPAMPS. Steady-state fluorescence, in the presence of a hydrophobic quencher (N,N-dimethylaniline) solubilized in the micelles, also shows a discontinuity at Yc1. Therefore, we conclude that Yc1 and Yc2 correspond to the binding of micelles to polymeric pyrene sites and AMPS sites, respectively. Analysis of UV spectra at varying Y demonstrates that the polymer-bound pyrene penetrates inside micelles and resides at or near the hydrophobic core. These results indicate preferential binding of micelles to pyrene binding sites; nevertheless, both Yc1 and Yc2 show a linear dependence on the square root of the ionic strength. This dependence suggests the dominant role of electrostatic forces, consistent with the observation that nonionic micelles will not bind to PyPAMPS. We conclude that conjoint hydrophobic and electrostatic effects determine the interaction between PyPAMPS and C12E6/ CTAC mixed micelles.

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“…Turbidity experiments (Figure 4) support the above hypotheses. There are no significant differences with the behavior observed in surfactant/polyelectrolyte mixtures [60]; indeed, a low number of conformational degrees of freedom is allowed. The phase diagrams of such mixtures resemble those observed in systems made of polyelectrolytes and oppositely charged surfactants ( Figure 5).…”

Section: Phase Behaviormentioning

confidence: 84%

Dispersability of Carbon Nanotubes in Biopolymer-Based Fluids

Tardani

Mesa

2015

Crystals

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Abstract:In this review the dispersability of carbon nanotubes in aqueous solutions containing proteins, or nucleic acids, is discussed. Data reported previously are complemented by unpublished ones. In the mentioned nanotube-based systems several different phases are observed, depending on the type and concentration of biopolymer, as well as the amount of dispersed nanotubes. The phase behavior depends on how much biopolymers are adsorbing, and, naturally, on the molecular details of the adsorbents. Proper modulation of nanotube/biopolymer interactions helps switching between repulsive and attractive regimes. Dispersion or phase separation take place, respectively, and the formation of liquid crystalline phases or gels may prevail with respect to dispersions. We report on systems containing ss-DNA-and lysozyme-stabilized nanotubes, representative of different organization modes. In the former case, ss-DNA rolls around CNTs and ensures complete coverage. Conversely, proteins randomly and non-cooperatively adsorb onto nanotubes. The two functionalization mechanisms are significantly different. A fine-tuning of temperature, added polymer, pH, and/or ionic strength conditions induces the formation of a given supra-molecular organization mode. The biopolymer physico-chemical properties are relevant to induce the formation of different phases made of carbon nanotubes.

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Polymer—surfactant interaction part II. Polymer and surfactant of opposite charge

Cited by 533 publications

References 62 publications

Comblike Liquid-Crystalline Polymers from Ionic Complexation of Dendronized Polymers and Lipids

Comblike Liquid-Crystalline Polymers from Ionic Complexation of Dendronized Polymers and Lipids

Binding of Cationic Mixed Micelles to Pyrene-Labeled Poly((acrylamido)-2-methylpropanesulfonate)

Dispersability of Carbon Nanotubes in Biopolymer-Based Fluids

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