Microstructure evolution and rheological responses of hard sphere suspensions

So, Jae-Hyun; Yang, Seung‐Man; Hyun, Jae Chun

doi:10.1016/s0009-2509(00)00474-7

Cited by 26 publications

(16 citation statements)

References 39 publications

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“…According to the cluster theory in ref. [12], once the hydrodynamic force is dominated at the critical strain amplitude point, the metastable clusters are formed and then the G′ and G * show dramatic increase, as also observed by So et al [13] .…”

Section: Dynamic Rheological Responsessupporting

confidence: 55%

“…The chaotic interactions between particles are responsible for enhancing dissipation energy and making particles jam, which makes the viscosity increase. Although there is some debate regarding the mechanisms responsible for shear thickening, more and more experiments [10,13,14] and evidences [15,16] have indicated that the cluster theory are more reasonable, which assumes that shear thickening only occurs in concentrated suspensions of non-aggregating solid particles. The suspension microstructure investigation showed that shear thickening could be attributed to the formation of clusters due to the action of hydrodynamic forces [9] .…”

Section: Discussionmentioning

confidence: 99%

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Rheological responses of fumed silica suspensions under steady and oscillatory shear

Yang

Ruan

Zou

et al. 2009

Sci. China Ser. E-Technol. Sci.

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Rheological experiments under steady and oscillatory shear were conducted for fumed silica suspensions in polyethylene glycol. Under steady shear the shear-thinning and thickening response were exhibited and the flow exponent N was determined. With the increase of concentration the flow exponent N showed a rapid increase, and it increased dramatically when the discontinuous shear-thickening took place. Oscillatory shear experiments were conducted at constant frequency and constant amplitude strain, respectively. The shear-thinning and the discontinuous shear-thickening behavior were observed under different constant frequencies from 10 to 80 rad/s. The correlation between complex modulus (G * ) and sweep frequency (ω) was illuminated at γ =750%. It was found that the correlation between G * and ω could be fitted by equation: G * ∝ω n . The indexes in shear-thinning region and shear-thickening were determined. The indexes were similar to some extent at shear-thinning region and increased dramatically to a much higher value when the shear-thickening occurred，especially at higher weight fractions. The behaviors can be qualitatively explained as follows: the shear-thinning owes to decrease of viscosity, which results from disruption of the aggregates; the cluster theory attributes the shear-thickening to the formation of metastable, flow induced clusters, which block the system.

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Section: Dynamic Rheological Responsessupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Rheological responses of fumed silica suspensions under steady and oscillatory shear

Yang

Ruan

Zou

et al. 2009

Sci. China Ser. E-Technol. Sci.

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“…8 Evolution of g along a trajectory for FE calculation Ohl and Gleissle 1993;So et al 2001), as well as the negative value of the second stress coefficient. However, for large Pe, thickening behavior which has been observed experimentally (Kolli et al 2002;Ohl and Gleissle 1993;So et al 2001) and numerically (Brady 2001;Foss and Brady 2000) in concentrated suspensions cannot be reproduced by the model here considered.…”

Section: Numerical Resultsmentioning

confidence: 99%

Deterministic solution of the kinetic theory model of colloidal suspensions of structureless particles

et al. 2012

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“…For monodisperse and randomly distributed spherical particles under equilibrium condition and with no imposed flow, the threshold of percolation is obtained at a volume fraction higher than 0.5. [41] The different aspect ratio and distribution of the dispersed phase in our systems may be responsible for percolation of particles occurring at a volume fraction lower than 0.5, [42,43] and, in particular at least ca. 0.35 (equal to 50 wt.-% NaCl).…”

Section: Microparticle Dissolution From Foamed and Unfoamed Compositesmentioning

confidence: 95%

Open‐Pore Biodegradable Foams Prepared via Gas Foaming and Microparticulate Templating

Salerno

Iannace

Netti

2008

Macromolecular Bioscience

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Open-pore biodegradable foams with controlled porous architectures were prepared by combining gas foaming and microparticulate templating. Microparticulate composites of poly(epsilon-caprolactone) (PCL) and micrometric sodium chloride particles (NaCl), in concentrations ranging from 70/30 to 20/80 wt.-% of PCL/NaCl were melt-mixed and gas-foamed using carbon dioxide as physical blowing agent. The effects of microparticle concentration, foaming temperature, and pressure drop rate on foam microstructure were surveyed and related to the viscoelastic properties of the polymer/microparticle composite melt. Results showed that foams with open-pore networks can be obtained and that porosity, pore size, and interconnectivity may be finely modulated by optimizing the processing parameters. Furthermore, the ability to obtain a spatial gradient of porosity embossed within the three-dimensional polymer structure was exploited by using a heterogeneous microparticle filling. Results indicated that by foaming composites with microparticle concentration gradients, it was also possible to control the porosity and pore-size spatial distribution of the open-pore PCL foams.

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Microstructure evolution and rheological responses of hard sphere suspensions

Cited by 26 publications

References 39 publications

Rheological responses of fumed silica suspensions under steady and oscillatory shear

Rheological responses of fumed silica suspensions under steady and oscillatory shear

Deterministic solution of the kinetic theory model of colloidal suspensions of structureless particles

Open‐Pore Biodegradable Foams Prepared via Gas Foaming and Microparticulate Templating

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