The interaction between multi-charged organic salts and poly(vinylpyridine) microgel particles

Fan, Kaizhong; Bradley, Melanie; Vincent, Brian

doi:10.1016/j.jcis.2009.12.029

Cited by 7 publications

(15 citation statements)

References 20 publications

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“…Finally, both methods predict the following consequence of processes under surfactant molecules addition: microgel collapse or contraction → microgel precipitation (zero of ζ-potential) → microgel overcharging → slight microgel reentrant swelling. These results are in general agreement with experimental studies. − …”

Section: Effect Of Hydrophobic Interactions Between the Surfactant Ta...supporting

confidence: 91%

“…In this paper, we develop a first, to our knowledge, theoretical model of interaction of PE microgels with oppositely charged surfactants, though significant amount of experimental data have been accumulated for the past decade. For instance, a number of works were devoted to microgel shrinking − and charge-reversal − induced by oppositely charged surfactants. In the present paper, these results are explained in the framework of our theory.…”

Section: Introductionmentioning

confidence: 99%

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Theory of Collapse and Overcharging of a Polyelectrolyte Microgel Induced by an Oppositely Charged Surfactant

2014

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We report on the theoretical study of interaction of ionic surfactants with oppositely charged microgel particles in dilute solutions. Two approaches are proposed. Within the first approach, the micellization of the surfactants inside the microgel is taken into account while the second model focuses on the hydrophobic interactions of the surfactant tails with the hydrophobic parts of microgel subchains. It has been shown that microgels effectively absorb surfactant ions. At low surfactant concentration this absorption is realized due to an ion exchange between microgel counterions and surfactant ions. The ion exchange is significantly affected by the amount of the microgel counterions initially trapped within the microgel particles which depends on the size of the microgel, its ionization degree, cross-linking density as well as polymer concentration in the solution. Increase of the surfactant concentration causes contraction of the microgels, which can be realized as either a continuous shrinking or a jump-like collapse transition depending on the system parameters. In the collapsed state additional absorption of surfactants by microgels takes place due to an energy gain from micellization or hydrophobic interactions. This leads to microgel precipitation and successive microgel overcharging at an excess of the surfactant in the solution. The theoretical results are compared with the existing experimental data, in particular, on photosensitive surfactant/microgel complexes.

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Section: Effect Of Hydrophobic Interactions Between the Surfactant Ta...supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Theory of Collapse and Overcharging of a Polyelectrolyte Microgel Induced by an Oppositely Charged Surfactant

2014

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“…In particular, we will investigate how the equilibrium properties of the nanosized gel particles are affected by the fraction f of the ionizable groups and salt concentration C s in solution. These important effects have also been explored by experiments [21][22][23][24][25][26][27][28][29] and theory 10,15,16,[30][31][32][33][34][35][36] .…”

Section: Introductionmentioning

confidence: 99%

Influence of network topology on the swelling of polyelectrolyte nanogels

Rizzi

Levin

2016

The Journal of Chemical Physics

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It is well-known that the swelling behavior of ionic nanogels depends on their cross-link density, however it is unclear how different topologies should affect the response of the polyelectrolyte network. Here we perform Monte Carlo simulations to obtain the equilibrium properties of ionic nanogels as a function of salt concentration Cs and the fraction f of ionizable groups in a polyelectrolyte network formed by cross-links of functionality z. Our results indicate that the network with cross-links of low connectivity result in nanogel particles with higher swelling ratios. We also confirm a de-swelling effect of salt on nanogel particles.

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“…[33]. In the case of ionic microgels, the effects of increasing the ionic strength and the polymer charge fraction over the swelling properties have been extensively investigated by means of computer simulations [34][35][36][37], experiments [38][39][40][41][42][43][44][45] and theory [23,33,[46][47][48][49][50]. It is now well established that the increase in the salt concentration leads to the particle de-swelling, while the dissociation of polymer chains produces an increase in the microgel volume.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium properties of charged microgels: A Poisson-Boltzmann-Flory approach

Colla¹,

Likos²,

Levin³

2014

The Journal of Chemical Physics

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The equilibrium properties of ionic microgels are investigated using a combination of the Poisson-Boltzmann and Flory theories. Swelling behavior, density profiles, and effective charges are all calculated in a self-consistent way. Special attention is given to the effects of salinity on these quantities. In accordance with the traditional ideal Donnan equilibrium theory, it is found that the equilibrium microgel size is strongly influenced by the amount of added salt. Increasing the salt concentration leads to a considerable reduction of the microgel volume, which therefore releases its internal material - solvent molecules and dissociated ions - into the solution. Finally, the question of charge renormalization of ionic microgels in the context of the cell model is briefly addressed.

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The interaction between multi-charged organic salts and poly(vinylpyridine) microgel particles

Cited by 7 publications

References 20 publications

Theory of Collapse and Overcharging of a Polyelectrolyte Microgel Induced by an Oppositely Charged Surfactant

Theory of Collapse and Overcharging of a Polyelectrolyte Microgel Induced by an Oppositely Charged Surfactant

Influence of network topology on the swelling of polyelectrolyte nanogels

Equilibrium properties of charged microgels: A Poisson-Boltzmann-Flory approach

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