Origins of the Non-DLVO Force between Glass Surfaces in Aqueous Solution

Adler, J.; Rabinovich, Ya. I.; Moudgil, Brij M.

doi:10.1006/jcis.2001.7466

Cited by 85 publications

(79 citation statements)

References 32 publications

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“…Other studies of silica colloids synthesized under a variety of experimental conditions have also reported increased stability of the silica particles at low pH values where the surface bears little charge (Allen and Matijevic, 1969;Depasse and Watillon, 1970;Higashitani et al, 1991;Kobayashi et al, 2005). Hypothesized reasons for this anomalous behavior include the presence of a repulsive steric force induced by a hairy gel-like surface layer of polysilicic acid chains protruding from the particle surface into solution (Vigil et al, 1994;Zhmud et al, 1998;Adler et al, 2001). The growth of this hairy layer is presumably promoted by aging the particles in water, thereby amplifying the anomalous stability behavior of colloidal silica (Kobayashi et al, 2005).…”

Section: Nanocolloid Stabilitymentioning

confidence: 92%

Modeling the kinetics of silica nanocolloid formation and precipitation in geologically relevant aqueous solutions

Conrad

Icopini

Yasuhara

et al. 2007

Geochimica et Cosmochimica Acta

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Section: Nanocolloid Stabilitymentioning

confidence: 92%

Modeling the kinetics of silica nanocolloid formation and precipitation in geologically relevant aqueous solutions

Conrad

Icopini

Yasuhara

et al. 2007

Geochimica et Cosmochimica Acta

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“…37 The finite thickness of this layer displaces the plane of origin of the diffuse layer outwards, and the van der Waals force is weakened because of the substantial water content of this layer. 36 Fig . 3b shows the measured interaction forces normalized to the effective radius.…”

Section: Interaction Forces Between Bare Silica Particlesmentioning

confidence: 99%

Probing the validity of the Derjaguin approximation for heterogeneous colloidal particles

Rentsch

Pericet-Cámara

Papastavrou

et al. 2006

Phys. Chem. Chem. Phys.

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The Derjaguin approximation states that the interaction force between two curved surfaces is proportional to their effective radius, whereby the inverse effective radius is the arithmetic mean of the inverse curvature radii of the surfaces involved. The present study investigates the validity of this approximation with an atomic force microscope (AFM) by measuring interaction forces between colloidal particles of different sizes, but of identical composition. Forces were measured between silica particles of 2.0, 4.8 and 6.8 mm in diameter in KCl electrolyte solution with and without adsorbed poly(amido amine) (PAMAM) dendrimers. The Derjaguin approximation could be confirmed at all distances investigated, including those comparable with the characteristic length scales of the surface roughness or the surface charge heterogeneities. For the conditions investigated, the Derjaguin approximation turns out to be surprisingly robust.

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“…The repulsion has been variously attributed to the presence of a structured layer of water at the silica surface 47 or to formation of a gel layer at the silica surface in the presence of water. This gel layer could be a water-swollen diffuse silica layer with a Hamaker constant almost equal to that of water 50 or a layer with protruding silanol and silicic acid groups that afford steric stabilization. 49,51 It is plausible that DMF and DMSO give rise to a similar solvation force.…”

Section: Colloidal Stability Of Silica In Dmso-dmfmentioning

confidence: 99%

Rotational dynamics of charged colloidal spheres: Role of particle interactions

Koenderink

Lettinga

Philipse

2002

The Journal of Chemical Physics

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Time-resolved phosphorescence anisotropy ͑TPA͒ is used to measure the short-time rotational diffusion coefficient D s r () of charged tracer spheres as a function of the volume fraction of like-charged colloidal host spheres in nonaqueous solvents. Sphere interactions are varied from long-range repulsive to short-range attractive by changing the ionic strength and the solvent composition. It is shown that D s r () is very sensitive to details of the interaction near contact, in agreement with theory. In contrast, the low-shear viscosity L () of the host dispersions is mostly controlled by the tail of the interaction potential. We discuss the applicability of Stokes-EinsteinDebye scaling D s r ()ϰ1/ L (), and D s r ()ϰ1/ ϱ (), where ϱ is the high-frequency-limiting viscosity. Scaling with L () fails at high particle and low salt concentrations, while scaling with ϱ is fairly good, in particular when an apparent nonstick boundary condition is imposed on the friction factor. We conclude that TPA is well suited for use as a microrheological technique.

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Origins of the Non-DLVO Force between Glass Surfaces in Aqueous Solution

Cited by 85 publications

References 32 publications

Modeling the kinetics of silica nanocolloid formation and precipitation in geologically relevant aqueous solutions

Modeling the kinetics of silica nanocolloid formation and precipitation in geologically relevant aqueous solutions

Probing the validity of the Derjaguin approximation for heterogeneous colloidal particles

Rotational dynamics of charged colloidal spheres: Role of particle interactions

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