Influence of ion size effects on the electrokinetics of aqueous salt-free colloids in alternating electric fields

Carrique, F.; Arroyo, Francisco J.; Delgado, A.V.

doi:10.1103/physreve.102.032614

Cited by 7 publications

(2 citation statements)

References 75 publications

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“…The results presented in the main part of the paper are for the low salt solutions with the average distance between solute particles smaller than the Debye length. The effect of the added salt is discussed in Appendix D. The distribution of counterions is important for the theories of colloidal stability, 28,29 electrophoretic mobility, 30 conductivity, 31 and viscosity 32,33 of charged particles. This paper primarily focuses on rigid particles and the extension of this work to flexible polymers will be presented in future publications.…”

Section: Author Contributionsmentioning

confidence: 99%

Where in the world are condensed counterions?

Tang

Rubinstein

2022

Soft Matter

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Section: Author Contributionsmentioning

confidence: 99%

Where in the world are condensed counterions?

Tang

Rubinstein

2022

Soft Matter

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“…In the vicinity of a charged electrode, electrolyte solution forms an electric double layer (EDL) that reflects the competition between electrostatic attraction of the counter-ions to the electrode surface and the translational entropy of the ions. The EDL is a problem of fundamental importance to subjects as diverse as colloid science [ 1 , 2 ], macromolecular conformation [ 3 , 4 ], and biological membranes [ 5 ], and has been a subject of much research interest over the past several decades [ 6 , 7 , 8 , 9 , 10 , 11 ]. It is well known that charged colloids (i.e., macroions) have typically a low relative dielectric constant (

≈ 2−5) which is much smaller than that of the surrounding solvent (e.g., for water

≈ 80).…”

Section: Introductionmentioning

confidence: 99%

On Capacitance and Energy Storage of Supercapacitor with Dielectric Constant Discontinuity

Zhou

2022

Nanomaterials

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The classical density functional theory (CDFT) is applied to investigate influences of electrode dielectric constant on specific differential capacitance Cd and specific energy storage E of a cylindrical electrode pore electrical double layer. Throughout all calculations the electrode dielectric constant varies from 5, corresponding to a dielectric electrode, to εwr = 108 corresponding to a metal electrode. Main findings are summarized as below. (i): By using a far smaller value of the solution relative dielectric constant εr = 10, which matches with the reality of extremely narrow tube, one discloses that a rather high saturation voltage is needed to attain the saturation energy storage in the ultra-small pore. (ii): Use of a realistic low εr = 10 value brings two obvious effects. First, influence of bulk electrolyte concentration on the Cd is rather small except when the electrode potential is around the zero charge potential; influence on the E curve is almost unobservable. Second, there remain the Cd and E enhancing effects caused by counter-ion valency rise, but strength of the effects reduces greatly with dropping of the εr value; in contrast, the Cd and E reducing effects coming from the counter-ion size enhancing remain significant enough for the low εr value. (iii) A large value of electrode relative dielectric constant εrw always reduces both the capacitance and energy storage; moreover, the effect of the εrw value gets eventually unobservable for small enough pore when the εrw value is beyond the scope corresponding to dielectric electrode. It is analyzed that the above effects take their rise in the repulsion and attraction on the counter-ions and co-ions caused by the electrode bound charges and a strengthened inter-counterion electrostatic repulsion originated in the low εr value.

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Ion size effect on the diffusiophoretic mobility of a large colloidal particle

Ohshima

2022

Colloid Polym Sci

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Influence of ion size effects on the electrokinetics of aqueous salt-free colloids in alternating electric fields

Cited by 7 publications

References 75 publications

Where in the world are condensed counterions?

Where in the world are condensed counterions?

On Capacitance and Energy Storage of Supercapacitor with Dielectric Constant Discontinuity

Ion size effect on the diffusiophoretic mobility of a large colloidal particle

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