Shear modulus of colloidal suspensions: Comparing experiments with theory

Eriksson, Rasmus; Pajari, Heikki; Rosenholm, Jarl B.

doi:10.1016/j.jcis.2008.12.034

Cited by 20 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An increase in the volume percent of the oil leads to an increase in both the dynamic moduli and yield stress, for category 2 emulsions (see Figure 3A). This behavior is consistent with known emulsion rheological behavior, where an increased dispersed phase increases rheological properties 25–28 . Conversely, for phase‐inverted category 3 emulsions, the opposite relation is observed—both dynamic moduli and yield stress decrease with increasing oil fraction (see Figure 3B).…”

Section: Resultssupporting

confidence: 88%

“…This behavior is consistent with known emulsion rheological behavior, where an increased dispersed phase increases rheological properties. [25][26][27][28] Conversely, for phase-inverted category 3 emulsions, the opposite relation is observed-both dynamic moduli and yield stress decrease with increasing oil fraction (see Figure 3B).…”

Section: Effect Of Formulation On Rheologymentioning

confidence: 97%

See 1 more Smart Citation

Direct ink writing of hierarchical porous alumina‐stabilized emulsions: Rheology and printability

2020

View full text Add to dashboard Cite

Bio‐inspired multi‐scaled (hierarchical) porous structures have remarkable strength and stiffness‐to‐density properties. Direct ink writing (DIW) or robocasting, an additive manufacturing (or also commonly known as 3D printing) material extrusion technique is able to create near‐net‐shaped complex geometries. A new approach of combining DIW, colloidal particle‐stabilized emulsion paste inks and partial densification to create tailored architectures of hierarchical porosity on three scales has been demonstrated. The printed and sintered ceramic lattice structures possess relatively high overall porosity of 78.7% (on average), comprising mainly (64.7%) open porosity. The effects of formulation (surfactant and oil concentrations, solids particle size, and mixing speed) on rheology and pore size and morphology have been investigated. The rheological properties (storage modulus, yield stress, and recovery of storage modulus) of the emulsions have been found to delineate the samples with good shape retention from those that slump. Additionally, the internal features of the sintered structures have been analyzed via X‐ray tomography and scanning electron microscope. The role of emulsion stability on printability and the internal structure of the prints has been investigated.

show abstract

Section: Resultssupporting

confidence: 88%

Section: Effect Of Formulation On Rheologymentioning

confidence: 97%

Direct ink writing of hierarchical porous alumina‐stabilized emulsions: Rheology and printability

2020

View full text Add to dashboard Cite

show abstract

“…6(b). As we aim to measure the linear elastic modulus as a function of resting time in the range of [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]] minutes, we chose c ¼ 10 À4 (10 À2 %) which is in the linear domain for the three resting times. It can be seen in Fig.…”

Section: Elastic Modulus Measurements Methodsmentioning

confidence: 99%

“…), or others [6]. Rheology of colloidal suspension is mainly controlled by particle interactions, and a lot of work has been devoted to study the link between interactions at the particle scale and the overall behavior of the suspension [2,5,[7][8][9][10][11]. Thanks to these works, consensus has emerged to attribute the intricate overall properties of attractive colloidal particle suspensions to the changes in the particle microstructure induced by flow.…”

Section: Introductionmentioning

confidence: 99%

Rheology signature of flocculated silica suspensions

Fusier

Goyon

Château

et al. 2018

Journal of Rheology

View full text Add to dashboard Cite

We experimentally study the behavior of suspensions of silica particles in aqueous solution. Despite many studies on these materials, the dependence of the overall rheological properties of the suspension on particle size, solid volume fraction, ionic strength, and strain history remains debated. In this paper, we manage to manufacture materials and develop procedures that allow us (i) to approach this problem in the best possible way and (ii) to check that the results obtained with well controlled systems (monodisperse silica spherical particles) also apply to less controlled suspensions (crushed silica particles). We find that the elastic modulus-particle size and yield stress-particle size relationships follow power laws that disagree with classical models from the literature. We also show that elastic modulus versus yields stress data fall on a single master curve when rescaled by particle size, whatever are solid volume fraction, resting time, and ionic strength. This suggests that the rescaled elastic modulus can play the role of a parameter in a structural kinetics model of the behavior of thixotropic suspensions. Furthermore confocal observations of the system provided evidence that the evolution of the overall properties of the material with resting time cannot be ascribed to changes in the particle network. V

show abstract

“…Hence, there are two kinds of interparticle interactions: electrical attraction between positively charged edges and negatively charged surfaces, and electrical repulsion between edges and=or surfaces of like charge. It has been confirmed that interparticle interactions are very important in controlling the colloidal behavior of the clay suspension, [12,13] and could be changed with the pH of solution, the type of electrolyte ion, surfactant, and polymer in the medium. [14][15][16][17][18][19][20][21] Among them, the added electrolyte, surfactant, or polymer could change the surface charge, the electrostatic repulsive and attractive interactions between particles, rendering interparticles extra interaction, and then influencing the flocculation state of the suspension.…”

Section: Introductionmentioning

confidence: 96%

Effects of Sodium Salts Organic Acids Modification on the Microstructure and Dispersion Behavior of Palygorskite Nano-Powder via High-Pressure Homogenization Process

Liu

Xu²,

Wang

et al. 2014

Journal of Dispersion Science and Technology

View full text Add to dashboard Cite

High-pressure homogenization could disaggregate the crystal bundles of palygorskite and favor the adsorption of electrolyte ions onto its surface through the produced cavitation, shear, and turbulence forces, and has evident influences on the micromorphologies and properties of clay. In this work, a series of palygorskite samples modified with sodium citrate, sodium benzoate, sodium lactate, sodium acetate, and sodium propionate were obtained under the condition of high-pressure homogenization. The effects of type and concentration of sodium salts organic acids on the microstructure, morphology, surface charge, and physicochemical property of palygorskite were studied through x-ray diffraction (XRD), N 2 adsorption-desorption isotherm, field emission scanning electron microscopy, zeta potential, rotational viscosity, and rheological measurements. XRD results confirmed that the crystal structure of homogenized palygorskite was not changed after introduction of sodium salts organic acids, but the aggregates were effectively disaggregated. Modification of palygorskite with sodium citrate made the surface more negatively charged, and the samples exhibited higher specific surface area and rheological properties. This work provided a method to improve the rheological properties of palygorskite suspension through dispersion of clay in sodium citrate solution followed by homogenization at 30 MPa.

show abstract

Shear modulus of colloidal suspensions: Comparing experiments with theory

Cited by 20 publications

References 27 publications

Direct ink writing of hierarchical porous alumina‐stabilized emulsions: Rheology and printability

Direct ink writing of hierarchical porous alumina‐stabilized emulsions: Rheology and printability

Rheology signature of flocculated silica suspensions

Effects of Sodium Salts Organic Acids Modification on the Microstructure and Dispersion Behavior of Palygorskite Nano-Powder via High-Pressure Homogenization Process

Contact Info

Product

Resources

About