Shear thickening of suspensions of porous silica nanoparticles

He, Qianyun; Gong, Xinglong; Xuan, Shouhu; Jiang, Wanquan; Qian, Chen

doi:10.1007/s10853-015-9151-5

Cited by 39 publications

(15 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[27]. The solvation layer was also used to explain the results found by He et al (2015) when combining porous nanosilica particles in ethylene glycol [29]. This hypothetical solvation layer around silica would increase interparticle distancing resulting in increased deflocculation and interparticle repulsion forces.…”

Section: Weight Fractionmentioning

confidence: 99%

Comparison of rheological behaviors with fumed silica-based shear thickening fluids

Moriana

Tian

Sencadas

et al. 2016

Korea-Aust. Rheol. J.

View full text Add to dashboard Cite

Shear thickening fluids (STFs) of differing compositions were fabricated and characterised in order to observe the effect of varying chemical and material properties on the resultant rheological behavior. Steady shear tests showed that for a given carrier fluid and particle size exists an optimum weight fraction which exhibits optimal shear thickening performance. Testing also showed that increasing particle size resulted in increased shear thickening performance and its onset whilst altering the carrier fluid chemistry has a significant effect on the thickening performance. An explanation is provided connecting the effect of varying particle size, carrier fluid chemistry and weight fraction to the resultant rheological behavior of the STFs. Two STFs were chosen for further testing due to their improved but contrasting rheological behaviors. Both STFs displayed a relationship between steady and dynamic shear conditions via the Modified Cox-Merz rule at high strain amplitudes (γ0 ≥ 500%). Understanding the effects of particle and liquid polymer chemistry on the shear thickening effect will assist in 'tailoring' STFs for certain potential or existing applications. AbstractShear thickening fluids (STFs) of differing compositions were fabricated and characterised in order to observe the effect of varying chemical and material properties on the resultant rheological behavior. Steady shear tests showed that for a given carrier fluid and particle size exists an optimum weight fraction which exhibits optimal shear thickening performance. Testing also showed that increasing particle size resulted in increased shear thickening performance and its onset whilst altering the carrier fluid chemistry has a significant effect on the thickening performance. An explanation is provided connecting the effect of varying particle size, carrier fluid chemistry and weight fraction to the resultant rheological behavior of the STFs. Two STFs were chosen for further testing due to their improved but contrasting rheological behaviors.Both STFs displayed a relationship between steady and dynamic shear conditions via the Modified Coz-Merz rule at high strain amplitudes ( 0 ≥ 500%). Understanding the effects of particle and liquid polymer chemistry on the shear thickening effect will assist in 'tailoring' STFs for certain potential or existing applications.

show abstract

Section: Weight Fractionmentioning

confidence: 99%

Comparison of rheological behaviors with fumed silica-based shear thickening fluids

Moriana

Tian

Sencadas

et al. 2016

Korea-Aust. Rheol. J.

View full text Add to dashboard Cite

show abstract

“…For some concentrated suspensions of particles, shear thickening behavior can be observed as an abrupt increase of the apparent viscosity η with increasing shear rate (BARNES et al, 1989;BOERSMA et al, 1990;FALL et al, 2010;KHANDAVALLI;ROTHSTEIN, 2015;NA et al, 2016). Under the action of an external stress or shear, the shear-thickening fluid becomes a yield material and its physical state transform to a solid-like state (HE et al, 2015). This process is reversible, the fluid-like state will return once the applied stress is removed.…”

Section: Shear-thickening Fluidsmentioning

confidence: 99%

Visualization of Viscoplastic Fluid Flow in an Abrupt Contraction Using Particle Image Velocimetry

Blanco¹,

Urazaki²,

Franco³

et al. 2019

Proceedings of the 25th International Congress of Mechanical Engineering

View full text Add to dashboard Cite

The viscoplastic fluid flow of Carbopol solutions is investigated in the following experimental study, for laminar and turbulent regime through an abrupt contraction with an aspect ratio of β = 1.85. The pressure drop profile and the pressure drop coefficient at the contraction are obtained for different entrance Reynolds numbers, Re D . The velocity vector fields are obtained for Re D between 1 and 10 000, using the Particle Image Velocimetry (PIV-2D). Mean velocity vector field and first-order turbulent quantities such as radial and axial velocity fluctuations are obtained, as well as centerline velocity behavior, vortex structures, and visualization of unyielded regions. It is observed that the pressure drop coefficient for viscoplastic fluid flow is dependent on the Re D for the laminar regime, and reaches a constant value for turbulent conditions, exhibiting good agreement with data available on the literature. The velocity profiles along the test section present lower values than those obtained for Newtonian fluids in both regimes and vary their behavior according to the rheological properties for each viscoplastic solution. Besides, the turbulent fluctuations approach the Newtonian behavior, with a slight difference for the radial profiles. The unyielded regions are deformed as the Reynolds number is increased and are replaced by vortex structures as the flow reaches transitional conditions, obtaining a variation of the effective diameter at the entrance of the contraction. The growth and changes of the vortex structure are studied using quantitative techniques based on the strain rate and the vorticity tensors, to gain accurate and better information about the behavior for these structures into the viscoplastic fluid flow. Finally, a relation was found for the entrance Reynolds number and the Reynolds number at the contraction plane, which is not dependent on the rheological parameters due to the high shear rates in this region.

show abstract

“…In particular, the rheological properties of colloidal particle suspension have been explored. According to the published studies, the dispersed phase of colloid suspensions can include silica particles [6], calcium carbonate particles [7], metal oxide particles [8], polystyrene particles [9] and others. Among these candidates, the silica particles, which have low density, low refractive index and high hardness, are the most promising materials for the preparation of high performance shear thickening fluids (STFs) [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of acid and temperature on the discontinuous shear thickening phenomenon of silica nanoparticle suspensions

Wang

Cai

et al. 2016

Chemical Physics Letters

View full text Add to dashboard Cite

Shear thickening of suspensions of porous silica nanoparticles

Cited by 39 publications

References 34 publications

Comparison of rheological behaviors with fumed silica-based shear thickening fluids

Comparison of rheological behaviors with fumed silica-based shear thickening fluids

Visualization of Viscoplastic Fluid Flow in an Abrupt Contraction Using Particle Image Velocimetry

Effect of acid and temperature on the discontinuous shear thickening phenomenon of silica nanoparticle suspensions

Contact Info

Product

Resources

About