Viscoelastic Properties of Particle Gels

Yanez, Joseph A.; Laarz, Eric; Bergström, Lennart

doi:10.1006/jcis.1998.5892

Cited by 87 publications

(73 citation statements)

References 54 publications

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“…48,50 The chain fractal dimension d is then limited to 1 < d < D. Given these denitions, typical values in the range x ¼ 2-5 and z ¼ 5-10 are observed.…”

Section: Linear Viscoelasticitymentioning

confidence: 99%

Homogeneous percolation versus arrested phase separation in attractively-driven nanoemulsion colloidal gels

et al. 2014

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We elucidate mechanisms for colloidal gelation of attractive nanoemulsions depending on the volume fraction (f) of the colloid. Combining detailed neutron scattering, cryo-transmission electron microscopy and rheological measurements, we demonstrate that gelation proceeds by either of two distinct pathways. For f sufficiently lower than 0.23, gels exhibit homogeneous fractal microstructure, with a broad gel transition resulting from the formation and subsequent percolation of droplet-droplet clusters.In these cases, the gel point measured by rheology corresponds precisely to arrest of the fractal microstructure, and the nonlinear rheology of the gel is characterized by a single yielding process. By contrast, gelation for f sufficiently higher than 0.23 is characterized by an abrupt transition from dispersed droplets to dense clusters with significant long-range correlations well-described by a model for phase separation. The latter phenomenon manifests itself as micron-scale "pores" within the droplet network, and the nonlinear rheology is characterized by a broad yielding transition. Our studies reinforce the similarity of nanoemulsions to solid particulates, and identify important qualitative differences between the microstructure and viscoelastic properties of colloidal gels formed by homogeneous percolation and those formed by phase separation.

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“…48,50 The chain fractal dimension d is then limited to 1 < d < D. Given these denitions, typical values in the range x ¼ 2-5 and z ¼ 5-10 are observed.…”

Section: Linear Viscoelasticitymentioning

confidence: 99%

Homogeneous percolation versus arrested phase separation in attractively-driven nanoemulsion colloidal gels

et al. 2014

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“…This is largely due to our imperfect knowledge of the rheology of these solid particles suspensions as they evolve from Newtonian to brittle behaviours. The difficulty here is that their macroscopic behaviour depends not only on the volume fraction, φ p , of particles (Jeffrey and Acrivos 1976), but is also strongly dependent on several microscopic factors such as the surface electrical charge (Russel 1978;van de Ven 1989;Allain et al 1994) and the size and the shape of the particles (Jeffrey and Acrivos 1976; Yanez et al 1999), the particle size distribution (Jeffrey and Acrivos 1976), the formation of aggregates and their network structure (Lin et al 1989;Prasher et al 2006;Chen et al 2007;Chevalier et al 2009) and large-scale factors such as the temperature, T, (e.g. Birdi 1997;Jones et al 1991;Mason and Weitz 1995;Mattsson et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Rheological and mechanical properties of silica colloids: from Newtonian liquid to brittle behaviour

et al. 2012

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Rheological and mechanical properties of aqueous mono-disperse silica suspensions (Ludox® HS40) are investigated as a function of particle volume fraction (φ p ranging from 0.22 to 0.51) and water content, using shear rate tests, oscillatory methods, indentation and an ultrasonic technique. As the samples are progressively dried, four regimes are identified; they are related to the increasing particle content and the existence and behaviour of the electrical double layer (EDL) around each particle. For 0.22 ≤ φ p ≤ 0.30), the suspensions are stable due to the strong electrostatic repulsion between particles and show Newtonian behaviour (I). As water is removed, the solution pH decreases and the ionic strength increases. The EDL thickness therefore slowly decreases, and screening of the electrostatic repulsion increases. For 0.31 ≤ φ p ≤ 0.35, the suspensions become turbid and exhibit viscoelastic (VE) shear thinning behaviour (II), as they progressively flocculate. For 0.35 ≤ φ p ≤ 0.47, the suspensions turn transparent again and paste-like, with VE shear thinning behaviour and high elastic modulus (III). At higher particle concentration, the suspensions undergo a glass transition and behave as an elastic brittle solid (IV, φ p = 0.51).

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“…The effect was essentially attributed to a decreasing amount of dispersant adsorbed onto the particles' surface with increasing temperature. However, besides the different coverage of particles by the dispersant, the change in polymer configuration and the variation of pK a values of the dissociable groups in the repeating units of polymer chain with temperature should also be taken into account (2). For a more complete description of the effect of temperature on colloidal stability, other important factors mainly related to particle-particle and particle-medium interactions need to be considered.…”

Section: Introductionmentioning

confidence: 99%

“…Yanez et al (2) studied the effect of temperature on colloidal stability of an alumina powder dispersed in hexanol and stabilized with poly(12-hydroxy stearic acid). Beyond the effect on the adsorption/desorption process, this work also contemplates the effects of temperature on polymer configuration and on the extent of the van der Waals interactions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature on Stability of Electrostatically Stabilized Alumina Suspensions

Tarì¹,

Olhero

Ferreira

2000

Journal of Colloid and Interface Science

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Viscoelastic Properties of Particle Gels

Cited by 87 publications

References 54 publications

Homogeneous percolation versus arrested phase separation in attractively-driven nanoemulsion colloidal gels

Homogeneous percolation versus arrested phase separation in attractively-driven nanoemulsion colloidal gels

Rheological and mechanical properties of silica colloids: from Newtonian liquid to brittle behaviour

Influence of Temperature on Stability of Electrostatically Stabilized Alumina Suspensions

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