Secondary coagulation

Hogg, R.; Yang, K.C

doi:10.1016/0021-9797(76)90123-5

Cited by 66 publications

(40 citation statements)

References 10 publications

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“…If the barrier Vmax is small, ,,~ O(kT), primary coagulation can occur [39], leading to irreversible aggregation at a distance r~. In the case of a deep secondary potential, Vser and a high barrier, Vm,x, the system shows secondary coagulation at the larger particle distance r:; a shallow potential leads to reversible aggregation [39][40][41]. Reversibly aggregated networks easily break after shaking or pumping and a fluid system results (Bingham plastic behaviour).…”

Section: Suspension Propertiesmentioning

confidence: 99%

“…3c, resulting in three-dimensional structures [39,40,42]. Hogg and Yang [41] calculated the coagulation rate for either primary or secondary coagulation and found in the latter case a weaker dependence on the electrolyte concentration; secondary coagulation is more important for larger particle sizes. This was also found by Zeichner and Schowalter [32,34], who calculated stability ratios for primary and secondary coagulation taking into account hydrodynamic effects.…”

Section: R---vppmentioning

confidence: 99%

“…When electrostatic repulsion is not sufficient to overcome the Van der Waals attraction, bridging of particles is promoted. In the circumstance of flocculation, bridging is favored by an isotropic particle shape [40] or large particle size [41] and the electrostatic repulsion on the ends is somewhat weaker than on the side of the chain, as calculated by Thomas and McCorke [44]. Also the particle diffusion to the chain ends is larger than to the middle.…”

Section: Chain Formationmentioning

confidence: 99%

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The conductance of suspensions with conducting particles

et al. 1992

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The conductance of conductive ceramics, graphite and metal suspensions in aqueous KOH solutions was measured with the impedance technique using a four-electrode cell. The measurements were carried out for volume fractions up to high viscosities with particles of different sizes. A wide frequency range was used to investigate also the effect of particle-surface polarisation on the conductance. The results have been analysed in terms of the asymmetric and symmetric theories of Bruggeman and the GEM theory for a wide volume-fraction range of suspended particles. Depending on the suspended material, particle size and electrolyte properties, the suspensions reveal flocculation or chain formation. In case of chain formation, sometimes a decrease of the polarisation resistivity is found due to shortcircuiting by direct particle-particle contact. The conductivities of the particles phase, calculated from measured values, are orders lower than predicted from conductivity data of the pure materials. This is attributed to the occurrence of a constriction resistance and film resistance between the particles in the case of flocculation or chain formation as well as to poor wetting of the particles.

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Section: Suspension Propertiesmentioning

confidence: 99%

Section: R---vppmentioning

confidence: 99%

Section: Chain Formationmentioning

confidence: 99%

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The conductance of suspensions with conducting particles

et al. 1992

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“…

11), hydrophobic interaction (12, 13), secondary minimum The influence of particle size on the kinetics of slow Brownian coagulation (6)(7)(8)(14)(15)(16), slow equilibration of the surface coagulation is studied. Colloidal gold was chosen as a model sys-charge during the collisions (17, 18), etc.-into traditional tem of spherically shaped colloidal particles with a rather sharp DLVO theory.

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mentioning

confidence: 99%

Surface Roughness and Particle Size Effect on the Rate of Perikinetic Coagulation: Experimental

Shulepov

Frens

1996

Journal of Colloid and Interface Science

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“…The calculated curves of the energy of the pair interaction between particles were used to calculate the stability ratios from the equations for the "barrier" and "barrierfree" mechanisms of coagulation [21][22][23]; that is,…”

Section: Calculations Of the Energy Of The Pairmentioning

confidence: 99%

Aggregate stability of ZrO2 aqueous sols in electrolyte solutions

et al. 2008

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The aggregate stability of submicron and nanosized ZrO 2 aqueous sols of different origins and different dispersities at pH 3-10 in the KCl concentration range 10 -3 -10 -1 M is investigated by flow ultramicroscopy and photometry. The results obtained are analyzed in the framework of the extended Derjaguin-Landau-Verwey-Overbeek theory and the Muller-Martynov theory of reversible aggregation. The extension of boundary layers of water near the surface of the ZrO 2 particles is estimated.

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Secondary coagulation

Cited by 66 publications

References 10 publications

The conductance of suspensions with conducting particles

The conductance of suspensions with conducting particles

Surface Roughness and Particle Size Effect on the Rate of Perikinetic Coagulation: Experimental

Aggregate stability of ZrO2 aqueous sols in electrolyte solutions

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