Brushes of Linear and Dendritically Branched Polyelectrolytes

Zhulina, Ekaterina B.; Leermakers, F.A.M.; Borisov, Oleg V.

doi:10.1002/9781119455042.ch7

Cited by 3 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…for high pHvalues) suggests that the fully ionized brush can be considered to be in the "osmotic brush" regime. 11, 68,69 For other values of c res NaCl (Figure S12), the same general picture is observed, although the onset of the transition gets shifted on the pH-scale. In contrast, in the case of a lower grafting density of = 0.01 2 (Figure S13), we observe that the brush deswells again at high pH-values.…”

supporting

confidence: 67%

Unexpected Two-Stage Swelling of Weak Polyelectrolyte Brushes with Divalent Counterions

Beyer,

Holm

2024

Preprint

View full text Add to dashboard Cite

We use particle-based, coarse-grained simulations to study the influence of divalent counterions on a weak polyelectrolyte brush. Our simulations show a profound influence of even small concentrations of divalent salt on the titration behavior of the brush, which is shown to be a combined effect of electrostatic interactions and the Donnan effect. Furthermore, we examine the partitioning of mono- and divalent counterions into the brush. We demonstrate the preferred uptake of divalent ions by the brush, which is further enhanced by electrostatic correlation effects. Finally, our simulations reveal a hitherto unobserved two-stage swelling of the brush as a function of the pH in the presence of divalent salt. This phenomenon arises as a consequence of charge regulation and ion partitioning.

show abstract

supporting

confidence: 67%

Unexpected Two-Stage Swelling of Weak Polyelectrolyte Brushes with Divalent Counterions

Beyer,

Holm

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…In this area, parabolic potential with a topology-dependent prefactor is valid only approximately, and the penetration length Δ, corresponding to full, partial, or peripheral penetration of the mobile polymer into the brush is not necessarily described by a power law. Transition lines between white and grey areas are specified by equality of size ≈ H/2q of the outer sublayer of the brush where only monomer units of free branches are found 29 and the Gaussian size an 1/2 of a branch and are marked by dashed lines. Blue area corresponds to the loss of stretching of both stems and free branches of the starlike macromolecules, that is, H ≅ an 1/2 , and full penetration of mobile chains into the brush.…”

Section: Macromoleculesmentioning

confidence: 99%

Dendron Brushes in Polymer Medium: Interpenetration and Depletion

et al. 2019

View full text Add to dashboard Cite

Structural properties of polymer brushes formed by branched treelike macromolecules (dendrons) attached to a surface and immersed into a melt of linear polymer chains are studied by means of self-consistent field theory. The conformational swelling-to-collapse transition provoked in the brush by an increase in the degree of polymerization of mobile polymer chains is analyzed. It is demonstrated that the sharpness of this transition decreases upon branching of tethered polymers. The effect of architecture of the brush-forming macromolecules on penetration and exclusion of mobile polymers is considered. The regimes of full, partial, and peripheral penetration of mobile chains into the brush are distinguished. The depth of penetration of mobile polymers into the brush is calculated as a function of molecular masses of mobile chains and tethered dendrons, grafting density, and topological parameters of the brush-forming macromolecules. It is demonstrated that the penetration length decreases upon branching of tethered macromolecules. For sufficiently long mobile chains, the penetration length is controlled by the number of monomer units in the longest elastic path of the dendrons. The predictions of the analytical self-consistent field theory are in excellent agreement with the results of numerical modeling based on the Scheutjens−Fleer approach.

show abstract

Unexpected Two-Stage Swelling of Weak Polyelectrolyte Brushes with Divalent Counterions

Beyer,

Holm

2024

ACS Macro Lett.

View full text Add to dashboard Cite

We use particle-based, coarse-grained simulations to study the influence of divalent counterions on a weak polyelectrolyte brush. Our simulations show a profound influence of even small concentrations of divalent salt on the titration behavior of the brush, which is shown to be a combined effect of electrostatic interactions and the Donnan effect. Furthermore, we examine the partitioning of monoand divalent counterions into the brush. We demonstrate the preferred uptake of divalent ions by the brush, which is further enhanced by electrostatic correlation effects. Finally, our simulations reveal a hitherto unobserved two-stage swelling of the brush as a function of the pH in the presence of divalent salt. This phenomenon arises as a consequence of charge regulation and ion partitioning.

show abstract

Brushes of Linear and Dendritically Branched Polyelectrolytes

Cited by 3 publications

References 47 publications

Unexpected Two-Stage Swelling of Weak Polyelectrolyte Brushes with Divalent Counterions

Unexpected Two-Stage Swelling of Weak Polyelectrolyte Brushes with Divalent Counterions

Dendron Brushes in Polymer Medium: Interpenetration and Depletion

Unexpected Two-Stage Swelling of Weak Polyelectrolyte Brushes with Divalent Counterions

Contact Info

Product

Resources

About