Structuring of poly(DADMAC) chains in aqueous media: a comparison between bulk and free-standing film measurementsPreliminary results were published in Tenside, Surfactants, Detergents, 2000, 37, 338. They were also presented at some international conferences such as the IACIS in Bristol (23rd–28th July 2000) and the LB9 in Potsdam (27th August–1st September 2000).

Klitzing, Regine von; Kolarić, Branko; Jaeger, Werner; Brandt, Astrid

doi:10.1039/b106929m

Cited by 57 publications

(47 citation statements)

References 31 publications

(52 reference statements)

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“…In particular, by neglecting the local rigidity on the blob size scale, the DFT would greatly underestimate the correlation length of the solution, which has been shown to be the length scales of the interactions. 4,5,13,[21][22][23][24]32,60 Nevertheless, insofar as the essential physics is concerned, we believe many of the qualitative findings drawn from this approximate theory at high concentrations are relevant to the experiments and simulations at lower concentrations.…”

Section: Discussionmentioning

confidence: 97%

“…Despite the contradictory results and differing explanations, it is generally agreed that, in the semidilute regime where most of the experiments and simulations were performed, the length scale of the interaction force is governed by the correlation length of the solution, which is a function of the concentration but not of the chain length. 4,5,13,[21][22][23][24]32 For example, Ref. 24 showed convincingly that the range of the attractive interaction in the interaction profile between two nonionic surfactant layers in a free-standing salt-free polyelectrolyte solution matched quantitatively with the correlation length of the solution as measured from small-angle neutron scattering.…”

Section: Introductionmentioning

confidence: 93%

“…Uncharged polymer/polyelectrolyte-mediated interactions between two neutral hard wall surfaces corresponding to different chain lengths. The dielectric constant of the system is uniform and set to ϵ = 80; the temperature is K; the monomer concentration is 0.5M, which is comparable to the concentrations used in some experiments 24 and simulations, 11,21,26,28 and the diameter of the monomers, counterions, and solvent is σ = 5 Å.…”

Section: A Salt-free Systemsmentioning

confidence: 99%

“…The origin of the oscillatory forces in polyelectrolyte solutions is less obvious, although the oscillatory-force behavior induced by polyelectrolytes has been extensively investigated during the last two decades. 5,11,[18][19][20][21][22][23][24][25][26][27][28] In contrast to simple liquids, the oscillating interactions between confined polyelectrolyte solutions are caused not by packing at the monomer length scales, but by the structures at mesoscopic scales. Dilute or semidilute solutions are known to form bulk structures (such as networks, stratification, liquidlike packing, and cylinderlike packing), which have been measured using small-angle scattering method (SAXS or SANS) 25 and other techniques.…”

Section: Introductionmentioning

confidence: 99%

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On the origin of oscillatory interactions between surfaces mediated by polyelectrolyte solution

Jiang

Ginzburg

Wang

2019

The Journal of Chemical Physics

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We use a numerical implementation of polymer classical density functional theory with an incompressibility condition to study the system consisting of nonadsorbing polyelectrolytes confined by two planar surfaces and quantify the effective interaction between the two planar surfaces as a function of the polyelectrolyte and salt concentrations. Our results indicate that for the uncharged surfaces (and weakly charged surfaces), the effective interaction primarily consists of a short-range attraction due to the depletion followed by repulsion due to the electric double layer overlapping and electrostatic correlations. For salt-free and low salt concentration systems, the magnitude of the repulsion barrier is determined by the overlap between the electric double layers, while at relatively high salt concentrations, the magnitude of the repulsion barrier is determined by the electrostatic correlations. Due to the competition between the electric double layer and the electrostatic correlations, the magnitude of the repulsion barrier varies nonmonotonically. In contrast, a mean-field Poisson-Boltzmann treatment of the electrostatics predicts a monotonically decreasing repulsion barrier with increasing salt concentration. At moderate salt concentrations, our theory predicts oscillatory interaction profiles. A comparison with the mean-field Poisson-Boltzmann treatment of electrostatics suggests that the oscillations are due primarily to electrostatic correlations.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 93%

Section: A Salt-free Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the origin of oscillatory interactions between surfaces mediated by polyelectrolyte solution

Jiang

Ginzburg

Wang

2019

The Journal of Chemical Physics

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“…A number of experimental techniques such as small-angle scattering (SAXS and SANS) ,− and dynamic light scattering (DLS) − have been used to study the polyelectrolyte solutions in bulk. A distinguishing bulk property of polyelectrolytes, which the neutral polymers lack of, is that SAXS or SANS measurements on polyelectrolyte solutions present broad structure peaks.…”

Section: Introductionmentioning

confidence: 99%

Structuring of Polyelectrolyte (NaPSS) Solutions in Bulk and under Confinement as a Function of Concentration and Molecular Weight

2011

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The present paper gives a deeper insight into the chain ordering in aqueous polyelectrolyte solutions under geometrical confinement as a function of degree of polymerization and polymer concentration. Colloidal probe atomic force microscopy (CP-AFM) and small-angle X-ray scattering (SAXS) are used to compare the poly(styrenesulfonate) (NaPSS) chain ordering between two solid interfaces and in bulk, respectively. Oscillatory forceÀdistance curves from CP-AFM as well as the scattering peaks from SAXS indicate a near range ordering of polyelectrolyte chains with structural parameters such as interchain distance, correlation length, and the strength of ordering. These characteristic lengths from CP-AFM (confinement) and SAXS (bulk) are in the same range. The interchain distance is up to 20% smaller and the correlation length is up to 20% higher under confinement, indicating a slight compression of the polyelectrolyte chains and a stronger counterion condensation under confinement. The interchain distance d scales with the monomer unit concentration c as d ∼ c À1/3 for a degree of polymerization N from 20 to 155 and as d ∼ c À1/2 for N = 367 and 10 690, indicating a dilute and semidilute regime, respectively. The transition from dilute to semidilute regime is in good agreement with the one found in viscosity measurements and with theoretical concepts. At a fixed monomer concentration, d depends on the chain length in the dilute regime while it is independent of the molecular weight in the semidilute regime. The experimental intercoil distance d in the dilute regime coincides well with the one calculated from the coil number density, which is based in turn on a theoretical model. Other models for calculating the interchain distance are discussed. The correlation length of the ordering increases with increasing molecular weight, indicating an increase in counterion condensation. The strength of ordering increases with the degree of polymerization due to entropic reasons.

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Foam, Emulsion and Wetting Films Stabilized by Polymeric Surfactants

Exerowa

Platikanov

2008

Highlights in Colloid Science

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Cited by 57 publications

References 31 publications

On the origin of oscillatory interactions between surfaces mediated by polyelectrolyte solution

On the origin of oscillatory interactions between surfaces mediated by polyelectrolyte solution

Structuring of Polyelectrolyte (NaPSS) Solutions in Bulk and under Confinement as a Function of Concentration and Molecular Weight

Foam, Emulsion and Wetting Films Stabilized by Polymeric Surfactants

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