Flow properties of coagulated colloidal suspensions

Firth, Bruce

doi:10.1016/0021-9797(76)90201-0

Cited by 185 publications

(32 citation statements)

References 13 publications

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“…The plastic viscosity of suspensions of hydrophobic glass is seen to increase much more steeply with increasing cv than the viscosity of suspensions of hydrophilic glass, z0 increases linearly with c~ ( Fig. 12), in accordance with the observations of Firth (5).…”

Section: B Suspensions In Glycerol + Water Mixturessupporting

confidence: 78%

“…Thus, the hypothesis that three-dimensional domains are formed which move as independent units, which describes the phenomena in coagulated suspensions (4)(5)(6)8), cannot account for the phenomena in noncoagulating suspensions, since it implies that a large part of the liquid is immobilized in these units; continuous flow is then difficult to visualize at high Cv. If we assume, for instance, within these units a Cv value of 0.72 (corresponding to hexagonal close packing of equal spheres), in a paste with an overall Cv = 0.6, the volume fraction of spheres and immobilized liquid becomes 0.83.…”

Section: Discussionmentioning

confidence: 99%

“…[5] The last term in (5) accounts for the fact that there will be a number of collisions predicted by cause (b) which has already been predicted by cause (a).…”

Section: Discussionmentioning

confidence: 99%

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Energy dissipation during stationary flow of suspensions of hydrophilic and hydrophobic glass spheres in organic liquids

Diemen¹,

Stein²

1982

Journal of Colloid and Interface Science

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Suspensions of both hydrophilic and hydrophobic glass spheres in dioctylphthalate behave similarly to suspensions of hydrophilic glass spheres in glycerol + water mixtures: Newtonian behavior is shown up to a solid volume fraction (Cv) of 0.4; at larger Cv values, Bingham behavior is observed with a yield value steeply increasing at cv > 0.45. Suspensions of hydrophobic glass spheres in glycerol + water mixtures, on the other hand, already show deviations from Newtonian behavior at Cv < 0.1. The phenomena indicate absence of coagulation in dioctylphthalate. The number of collisions between the glass spheres in noncoagulating suspensions with 0.45 < Cv < 0.58 is calculated. That part of the energy dissipated per collision, which is independent of the mutual velocity of the colliding particles, cannot be accounted for by the attractive potential energy between the spheres as calculated by the Hamaker equation; in this respect the situation is analogous to that observed on floc formation in coagulating suspensions. It is suggested that the energy dissipation concerned is caused by the motion of spheres in the vicinity of a colliding pair, with the number of spheres entrained decreasing with increasing mutual velocity of the colliding spheres.

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Section: B Suspensions In Glycerol + Water Mixturessupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

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Energy dissipation during stationary flow of suspensions of hydrophilic and hydrophobic glass spheres in organic liquids

Diemen¹,

Stein²

1982

Journal of Colloid and Interface Science

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“…Earlier results had led some authors (2,(15)(16)(17)(18)(19) to the conclusion that breaking and renewed formation ofinterparticle bonds does not contribute significantly to E. However, the reverse has been argued as well (22,23).…”

Section: Discussionmentioning

confidence: 94%

Rheology of suspensions of hydrophilic and hydrophobic solid particles in nonaqueous media

Diemen¹,

Schreuder²,

Stein³

1985

Journal of Colloid and Interface Science

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Coagulation of suspensions of hydrophobic particles becomes apparent if the hydrophilic/lipophilic balance (HLB) value of the medium is larger than 14; suspensions of hydrophilic solid particles show no distinct tendency toward coagulation in the media investigated (HLB I> 4.5). As a criterion for coagulation, rheological, and sedimentation characteristics are employed, The rheological behavior of these suspensions indicates that both in the Newtonian and in the non-Newtonian range, the energy dissipation during stationary flow is proportional to the viscosity of the suspension medium. This excludes any significant contribution to this energy dissipation from the increase and decrease of potential energy between the suspended particles (breaking and renewed formation of interparticle bonds).

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“…The aim of the present work was to investigate, whether the "elastic floc" model developed by Hunter et al [1][2][3] and van de Ven and Hunter [4] can account for the rheology of concentrated coagulated suspensions.…”

Section: Introductionmentioning

confidence: 99%

The rheological behaviour of Ca(OH)2 suspensions

Diemen

Stein

1983

Rheol Acta

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Abstract:The theological behaviour of Ca(OH)2 suspensions is investigated, predominantly at a solid volume fraction of 0.25. The influence of standing without being subject to shear ("contact time") is distinguished from that of being sheared ("shearing time"). The results are interpreted on the basis of the "elastic floc" model of energy dissipation during flow, with a view to the problem whether, in addition to an energy dissipation term related to the viscous drag experienced by particles moving within flocs, there should be an independent energy dissipation term related to fluid movement in the flocs when they change volume or shape. It appears that this additional energy dissipation term is not necessary, if the increase in viscous friction, experienced by two particles which are close together, is taken into account.

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Flow properties of coagulated colloidal suspensions

Cited by 185 publications

References 13 publications

Energy dissipation during stationary flow of suspensions of hydrophilic and hydrophobic glass spheres in organic liquids

Energy dissipation during stationary flow of suspensions of hydrophilic and hydrophobic glass spheres in organic liquids

Rheology of suspensions of hydrophilic and hydrophobic solid particles in nonaqueous media

The rheological behaviour of Ca(OH)2 suspensions

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