Independent ion migration in suspensions of strongly interacting charged colloidal spheres

Hessinger, Dirk; Evers, M.; Palberg, Thomas

doi:10.1103/physreve.61.5493

Cited by 66 publications

(58 citation statements)

References 39 publications

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“…[20][21][22] Differences between the effective charge obtained from conductivity and elasticity measurements were attributed to either charge renormalization 15 or macroion shielding due to many-body effects. [23][24][25] Similar conclusions were obtained for silica particles with ionizable carboxylate groups on the surface.…”

Section: Introductionmentioning

confidence: 99%

Phase diagrams of colloidal spheres with a constant zeta-potential

Smallenburg

Boon

Kater

et al. 2011

The Journal of Chemical Physics

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We study suspensions of colloidal spheres with a constant zeta-potential within Poisson-Boltzmann theory, quantifying the discharging of the spheres with increasing colloid density and decreasing salt concentration. We use the calculated renormalized charge of the colloids to determine their pairwise effective screened-Coulomb repulsions. Bulk phase diagrams in the colloid concentration-salt concentration representation follow, for various zeta-potentials, by a mapping onto published fits of phase boundaries of point-Yukawa systems. Although the resulting phase diagrams do feature facecentered cubic and body-centered cubic phases, they are dominated by the (re-entrant) fluid phase due to the colloidal discharging with increasing colloid concentration and decreasing salt concentration.

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Section: Introductionmentioning

confidence: 99%

Phase diagrams of colloidal spheres with a constant zeta-potential

Smallenburg

Boon

Kater

et al. 2011

The Journal of Chemical Physics

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“…The effective charge Z eff σ from density dependent measurements of the conductivity measures the number of mobile counter-ions. It was found to be independent of the particle number density in the range of n = 0.5 -40µm -3 , which correspond to volume fractions around Φ = (4π/3)a 3 n = 0.003 -0.02 [48]. The effective charge from elasticity Z eff G , gives a measure of the interaction strength.…”

Section: Experimental Particlesmentioning

confidence: 99%

Melting and freezing lines for a mixture of charged colloidal spheres with spindle-type phase diagram

Lorenz

Palberg

2010

The Journal of Chemical Physics

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“…The combination of the mobility and conductivity results then allows us to determine an apparent net charge Z net,app by assuming that the conductivity is proportional to the total number of charges present in the system times the microgel mobility [31]:…”

Section: B Experimental Techniquesmentioning

confidence: 99%

Impact of volume transition on the net charge of poly-N-isopropyl acrylamide microgels

et al. 2016

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We explore the electrostatic properties of poly-N-isopropyl acrylamide microgels in dilute, quasi-de-ionized dispersions and show that the apparent net charge of these thermosensitive microgels is an increasing function of their size, the size being conveniently varied by temperature. Our experimental results obtained in a combination of light scattering, conductivity, and mobility experiments are consistent with those obtained in Poisson-Boltzmann cell model calculations, effectively indicating that upon shrinking the number of counterions entrapped within the microgels increases. Remarkably, this behavior shows that the electrostatic energy per particle remains constant upon swelling or deswelling the microgel, resulting in a square root dependence of the net charge on the particle radius.

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Independent ion migration in suspensions of strongly interacting charged colloidal spheres

Abstract: We report on sytematic measurements of the low frequency conductivity σ σ σ σ in aequous supensions of highly charged colloidal spheres. System preparation in a closed tubing system results in precisely controlled number densities of 10 16

Cited by 66 publications

References 39 publications

Phase diagrams of colloidal spheres with a constant zeta-potential

Phase diagrams of colloidal spheres with a constant zeta-potential

Melting and freezing lines for a mixture of charged colloidal spheres with spindle-type phase diagram

Impact of volume transition on the net charge of poly-N-isopropyl acrylamide microgels

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