The additional surface conductance: its role in the primary electroviscous effect

Rubio-Hernández, F.J.; Ruiz-Reina, Emilio; Gómez-Merino, A.I.

doi:10.1016/s0927-7757(01)00735-x

Cited by 18 publications

(19 citation statements)

References 38 publications

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“…If the liquid contains an electrolyte and the particles are charged, then the effective viscosity η s is further increased. This phenomenon is called the primary electroviscous effect [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and the effective viscosity η s can be expressed as…”

Section: Introductionmentioning

confidence: 99%

Effective Viscosity of a Concentrated Suspension of Uncharged Spherical Soft Particles

Ohshima

2009

Langmuir

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We present a theory of the effective viscosity eta(s) of a concentrated suspension of uncharged polymer-coated spherical particles, which are termed uncharged spherical soft particles, in a liquid of viscosity eta on the basis of a cell model. These particles consist of the uncharged particle core of radius a covered with an uncharged polymer layer of thickness d (a polymer-coated particle thus has an inner radius a and an outer radius b = a + d). We assume that polymer segments are regarded as resistance centers, exerting frictional forces--gamma u on the liquid flowing in the polymer layer, where u is the liquid velocity and gamma is the frictional coefficient. We derive an analytic expression for the effective viscosity eta(s) of the suspension, which depends on the radii a and b, and volume fraction phi of the spheres and a parameter lambda = (gamma/eta)(1/2). The obtained expression for eta(s) exhibits the correct limiting behaviors. That is, as phi --> 0, the obtained expression for eta(s) becomes that for a dilute suspension of uncharged soft spheres (Ohshima, Langmuir 2008, 24, 6453). As a --> 0, the obtained viscosity expression becomes that for the case of a concentrated suspension of uncharged porous spheres (Ohshima, Colloids Surf. A: Physicochem. Eng. Aspects 2009, 347, 33). In the further limit of a --> 0 and phi --> 0, the obtained viscosity expression becomes the viscosity expression derived for the case of a dilute suspension of uncharged porous spheres by Natraj and Chen (J. Colloid Interface Sci. 2002, 251, 200). As lambda --> infinity or a --> b, the obtained viscosity expression tends to Simha's result (J. Appl. Phys. 1952, 23, 1020) for a concentrated suspension of uncharged rigid spheres of radius b, while as lambda --> 0, it becomes that for uncharged rigid spheres of radius a.

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Section: Introductionmentioning

confidence: 99%

Effective Viscosity of a Concentrated Suspension of Uncharged Spherical Soft Particles

Ohshima

2009

Langmuir

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“…By applying the same perturbation scheme described above and the symmetry of the problem, we obtain the same Eqs. (33) and (35) and the new equation…”

Section: Added Counterions Water Dissociation and Co 2 Contaminatiomentioning

confidence: 99%

“…(33), (35), (54), and (56) with boundary conditions (36)- (38) and (45)- (50) to obtain the complete set of fields that describe the problem. A MAT-LAB program for the calculation is available from the authors.…”

Section: Added Counterions Water Dissociation and Co 2 Contaminatiomentioning

confidence: 99%

“…Various theories that try to predict the experimental results have been presented. Rubio-Hernández et al [30][31][32][33] and Sherwood et al [34] included in the theoretical models the contribution of the ionic transport into the Stern layer. They found an improvement of the predictions when the influence of a dynamic Stern layer was taken into account in both the viscosity calculations and the experimental determinations of the state of charge and properties of the suspension.…”

Section: Introductionmentioning

confidence: 99%

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Electroviscous effect of concentrated suspensions in salt-free media: Water dissociation and CO2 influence

Ruiz-Reina

Carrique²

2010

Journal of Colloid and Interface Science

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“…For suspensions at rest, the additional surface conductance has been studied by Rubio-Herná ndes et al [1]. They claim that a dynamic Stern layer based on the adsorbed ionic spaces on the particle surface may be responsible for viscosity effects in nanosuspensions and thus for the thermal conductivity behaviour.…”

Section: Introductionmentioning

confidence: 99%

Modified self-consisted scheme to predict the thermal conductivity of nanofluids

Hadjov

2009

International Journal of Thermal Sciences

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The additional surface conductance: its role in the primary electroviscous effect

Cited by 18 publications

References 38 publications

Effective Viscosity of a Concentrated Suspension of Uncharged Spherical Soft Particles

Effective Viscosity of a Concentrated Suspension of Uncharged Spherical Soft Particles

Electroviscous effect of concentrated suspensions in salt-free media: Water dissociation and CO2 influence

Modified self-consisted scheme to predict the thermal conductivity of nanofluids

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