Organization of surfactant micelles adsorbed on a polymer molecule in water : a neutron scattering study

Cabane, Bernard; Duplessix, R.

doi:10.1051/jphys:0198200430100152900

Cited by 352 publications

(291 citation statements)

References 28 publications

Supporting

Mentioning

267

Contrasting

Unclassified

Order By: Relevance

“…This distinction is analogous to the one made in the critical behavior of certain disordered systems [17,18] -if the critical exponent ν of a system satisfies ν < 2/d, the critical behavior would be smeared by impurities (in analogy to the partial collapse), whereas if ν > 2/d, the critical point remains intact. Indeed, neutral flexible polymers in three dimensions, having ν ≃ 3/5 < 2/3, are found by scattering experiments to associate with surfactants in the form of a 'chain of wrapped aggregates' [19,20]. On the other hand, stiff DNA molecules, having ν = 1 on the relevant length scale, are found to either remain unperturbed by surfactant binding [6,9], or undergo a discontinuous coil-to-globule transition [5], provided the chain is much longer than the persistence length.…”

Section: Introductionmentioning

confidence: 99%

Binding of molecules to DNA and other semiflexible polymers

Diamant

Andelman

2000

Phys. Rev. E

View full text Add to dashboard Cite

A theory is presented for the binding of small molecules such as surfactants to semiflexible polymers. The persistence length is assumed to be large compared to the monomer size but much smaller than the total chain length. Such polymers (e.g., DNA) represent an intermediate case between flexible polymers and stiff, rod-like ones, whose association with small molecules was previously studied. The chains are not flexible enough to actively participate in the self-assembly, yet their fluctuations induce long-range attractive interactions between bound molecules. In cases where the binding significantly affects the local chain stiffness, those interactions lead to a very sharp, cooperative association. This scenario is of relevance to the association of DNA with surfactants and compact proteins such as RecA. External tension exerted on the chain is found to significantly modify the binding by suppressing the fluctuation-induced interaction.61.25.Hq,87.15.Nn,87.14.Gg

show abstract

Section: Introductionmentioning

confidence: 99%

Binding of molecules to DNA and other semiflexible polymers

Diamant

Andelman

2000

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…[11][12][13][14][15][16][17][18][19] We summarize below, briefly, what is known via a variety of techniques 11,12,[14][15][16][17][18][19][20][21][22] including NMR relaxometry 11,23,24 and diffusometry. 10,12,18,19,25 1.…”

Section: Introductionmentioning

confidence: 99%

An NMR study of macromolecular aggregation in a model polymer-surfactant solution

Barhoum

Yethiraj

2010

The Journal of Chemical Physics

View full text Add to dashboard Cite

A model complex-forming nonionic polymer-anionic surfactant system in aqueous solution has been studied at different surfactant concentrations. Using pulsed-field-gradient diffusion NMR spectroscopy, we obtain the self-diffusion coefficients of poly͑ethylene glycol͒ ͑PEO͒ and sodium dodecyl sulfate ͑SDS͒ simultaneously and as a function of SDS concentration. In addition, we obtain NMR relaxation rates and chemical shifts as a function of SDS concentration. Within the context of a simple model, our experimental results yield the onset of aggregation of SDS on PEO chains ͑CAC= 3.5 mM͒, a crossover concentration ͑C 2 =60 mM͒ which signals a sharp change in relaxation behavior, as well as an increase in free surfactant concentration and a critical concentration ͑C m = 145 mM͒ which signals a distinct change in diffusion behavior and a crossover to a solution containing free micelles. C m also marks the concentration above which obstruction effects are definitely important. In addition, we obtain the concentration of SDS in monomeric form and in the form of free micelles, as well as the average number of SDS molecules in a PEO-SDS aggregate ͑N Aggr ͒. Taken together, our results suggests continuous changes in the aggregation phenomenon over much of the concentration but with three distinct concentrations that signal changes in the nature of the aggregates.

show abstract

“…Many experimental approaches have been used to study polymer -surfactant interactions such as turbidimetry [21,23], light scattering [26 -30], small-angle neutron scattering [35], electrophoretic light scattering [36,37], NMR [38], dialysis [26,39,40], surface tension [41 -44], viscometry [28,41], calorimetry [45], dye-solubilization [46,47], and solvatochromic studies [48], but relatively few techniques can be utilized to identify the phase transition and to clarify the dynamics of polyelectrolyte -micelle association. Static [28,30,49] and quasielastic [25,[27][28][29]49] light scattering especially have provided important information on the size and structure of polymermicelle complexes but soluble complexes can only be detected by QELS if their lifetime (residence time) is sufficiently long and the scattering intensity of the complexes is sufficiently large compared with those of the micelles and polymers from which they form.…”

Section: Introductionmentioning

confidence: 99%

Interactions of micelles with fluorescence-labeled polyelectrolytes

Morishima

Mizusaki

Yoshida

et al. 1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Pyrene-labeled polyelectrolytes can be used to study the interaction between the polyelectrolyte and an oppositely charged micelle, if the micelle incorporates a fluorescence quencher. If the charge on the micelle is varied systematically, polymer-micelle complex formation can be observed at some well-defined micelle surface charge density. Applying a kinetic model to steady-state and time-dependent fluorescence quenching data, one can estimate the binding constant (K), association rate constant, and lifetime (residence time). K increases strongly with increase in micelle surface charge density (|) or decrease in ionic strength (v). These effects arise from the dependence of association rate constant and residence time on | and v. While these observations reflect the fundamental electrostatic nature of the interaction, it is also found that micelles preferentially bind to pyrene sites, so that complex formation results from the conjoint action of electrostatic and hydrophobic forces.

show abstract

Organization of surfactant micelles adsorbed on a polymer molecule in water : a neutron scattering study

Cited by 352 publications

References 28 publications

Binding of molecules to DNA and other semiflexible polymers

Binding of molecules to DNA and other semiflexible polymers

An NMR study of macromolecular aggregation in a model polymer-surfactant solution

Interactions of micelles with fluorescence-labeled polyelectrolytes

Contact Info

Product

Resources

About