Altering and eliminating irreversible shear thickening of fumed silica slurries using spherical silica

2021 ◽  
Author(s):  
Ehsan Akbari Fakhrabadi ◽  
Chloë A. Bullard ◽  
Matthew W. Liberatore
Keyword(s):  
Fumed Silica ◽  
Shear Thickening ◽  
Spherical Silica

Effect of addition of different nano-clays on the fumed silica-polyethylene glycol based shear-thickening fluids

2018 ◽  
Vol 5 (1) ◽  
pp. 014001 ◽  
Author(s):  
Mansi Singh ◽  
Rajeev Mehta ◽  
Sanjeev K Verma ◽  
Ipsita Biswas
Keyword(s):  
Polyethylene Glycol ◽  
Fumed Silica ◽  
Shear Thickening ◽  
Shear Thickening Fluids

On the effectiveness of incorporating shear thickening fluid with fumed silica particles in hip protectors

2017 ◽  
Vol 27 (1) ◽  
pp. 015021 ◽  
Author(s):  
A Haris ◽  
B W Y Goh ◽  
T E Tay ◽  
H P Lee ◽  
A V Rammohan ◽  
...  
Keyword(s):  
Fumed Silica ◽  
Shear Thickening ◽  
Silica Particles ◽  
Shear Thickening Fluid ◽  
Hip Protectors

Transient Study on the Shear Thickening Behaviour of Surface Modified Fumed Silica Suspensions in Polypropylene Glycol

2008 ◽  
Author(s):  
F. J. Galindo-Rosales ◽  
F. J. Rubio-Hernández ◽  
Albert Co ◽  
Gary L. Leal ◽  
Ralph H. Colby ◽  
...  
Keyword(s):  
Fumed Silica ◽  
Shear Thickening ◽  
Polypropylene Glycol ◽  
Transient Study ◽  
Surface Modified ◽  
Silica Suspensions

Temperature induced gelation transition of a fumed silica/PEG shear thickening fluid

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18367-18374 ◽  
Author(s):  
Xi-Qiang Liu ◽  
Rui-Ying Bao ◽  
Xiao-Jun Wu ◽  
Wei Yang ◽  
Bang-Hu Xie ◽  
...  
Keyword(s):  
Fumed Silica ◽  
Shear Thickening ◽  
Shear Thickening Fluid

An interesting gelation transition of fumed SiO2/PEG shear thickening fluid induced by elevating the temperature.

Steady shear and dynamic strain thickening of halloysite nanotubes and fumed silica shear thickening composite

2018 ◽  
Vol 38 (10) ◽  
pp. 915-923
Author(s):  
Pavni Passey ◽  
Mansi Singh ◽  
Sanjeev K. Verma ◽  
Debarati Bhattacharya ◽  
Rajeev Mehta
Keyword(s):  
Shear Rate ◽  
Fumed Silica ◽  
Shear Thickening ◽  
Halloysite Nanotubes ◽  
Spherical Particles ◽  
Dynamic Strain ◽  
Critical Shear Rate ◽  
Shear Thickening Fluids ◽  
Protective Fabrics ◽  
Critical Viscosity

Abstract Developing the shear thickening fluids (STF) which can be used for soft body armours requires an in depth study of various parameters related to its constituents so that a high critical viscosity along with high critical shear rate can be obtained. Shape of the constituting particles is one such important parameter. Elongated and nanosize particles provide high critical viscosity to the fluid, whereas spherical particles show high critical shear rates. STF were prepared using halloysite (Hal) nanotubes of different concentrations with fumed silica (spheres) and their rheological properties were studied. A better non-flocculated structure was obtained at 1% Hal in 20% fumed silica composition, exhibiting a critical viscosity of 25 Pas at a critical shear rate 160 s−1 as compared to that of only spherical particle STF (10 Pas and 200 s−1). The oscillatory tests revealed that this composition, with a better consistent reproducible behaviour and better stability than the STF without Hal, would be suitable as a high impact resistant material. Gel formation does not take place, rather the fluid behaves like a dispersed sol, making it a better choice for using with protective fabrics. The rheology was studied at different temperatures ranging from 0°C to 55°C.

scholarly journals Rheology of Fumed Silica and Polyethylene Glycol Shear Thickening Suspension with Nanoclay as an Additive

2019 ◽  
Vol 69 (4) ◽  
pp. 402-408 ◽  
Author(s):  
Mansi Singh ◽  
Sanjeev K Verma ◽  
Ipsita Biswas ◽  
Rajeev Mehta
Keyword(s):  
Steady State ◽  
Polyethylene Glycol ◽  
Fumed Silica ◽  
Shear Thickening ◽  
Dynamic State ◽  
Shear Thickening Fluid ◽  
Organically Modified ◽  
The Difference ◽  
Critical Viscosity ◽  
Stability And Consistency

Shear thickening properties of fumed silica-polyethylene glycol (PEG) with shear thickening fluid (STF) of different concentrations and with an organically modified clay, Nanomer I.28 E as nano-additive have been investigated by both steady-state and dynamic state rheology. Difference in rheology if instead of nanoclay, an equal wt% of additional fumed silica is added to 20 per cent fumed silica-PEG200 STF, has been studied. At 25 °C, in case of addition of nanoclay the increase in critical viscosity is less than that observed for same additional amount of fumed silica. Interestingly, an opposite result is seen at higher temperatures i.e. 45 °C and 55 °C. Moreover, the difference in steady-state and dynamic state viscosity values decreases on addition of nanoclay. It is noted that an increase in concentration of clay increases the value of dynamic parameters whereas for STF of only fumed silica particles the values are constant irrespective of the change in concentration. More importantly, ease of processing, elasticity, stability and consistency of rheological results of STF increases to a significant extent on addition of relatively inexpensive nano-additive.

scholarly journals Anisotropic Nanoparticles Contributing to Shear-Thickening Behavior of Fumed Silica Suspensions

ACS Omega ◽  
2017 ◽  
Vol 2 (12) ◽  
pp. 8877-8887 ◽  
Author(s):  
Mahla Zabet ◽  
Kevin Trinh ◽  
Hossein Toghiani ◽  
Thomas E. Lacy ◽  
Charles U. Pittman ◽  
...  
Keyword(s):  
Fumed Silica ◽  
Shear Thickening ◽  
Anisotropic Nanoparticles ◽  
Thickening Behavior ◽  
Silica Suspensions

scholarly journals Heat Transfer and Rheological Behavior of Fumed Silica Nanofluids

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1535 ◽  
Author(s):  
A.I. Gómez-Merino ◽  
J.J. Jiménez-Galea ◽  
F.J. Rubio-Hernández ◽  
J.L. Arjona-Escudero ◽  
I.M. Santos-Ráez
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Rheological Behavior ◽  
Fumed Silica ◽  
Shear Thickening ◽  
Good Control ◽  
Thermomechanical Properties ◽  
Polypropylene Glycol ◽  
Conductivity Measurements ◽  
Liquid Phases

The addition of nanoparticles to liquid media can improve thermomechanical properties of dispersants. This ability gives rise to the development of multiple applications of nanofluids (NF) in branches so different as electronic and photonic devices or cosmetic industry. Logically, these applications require a good control of heat transfer and flow properties. Moreover, if we consider the necessity to optimize industrial processes in which NF take part, it is necessary to obtain possible relationships between both physical mechanisms. Specifically, in this work, a study about thermal conductivity and rheological behavior of fumed silica suspensions in polypropylene glycol (PPG400) and polyethylene glycol (PEG200) was performed. The study of these two suspensions is interesting because the flow behaviors are very dissimilar (while the fumed silica in PEG200 suspension is viscoplastic, the fumed silica in PPG400 suspension shows shear-thickening behavior between two shear-thinning regions), despite the addition of fumed silica producing similar enhancement of the relative thermal conductivity in both liquid phases. The more outstanding contribution of this work lies in the combination of rheological and conductivity measurements to deepen in the understanding of the heat transfer phenomenon in NF. The combination of rheological together with thermal conductivity measurements have permitted establishing the mechanisms of liquid layering and aggregate formation as the more relevant in the heat transfer of these silica fumed suspensions.

Shear thickening and defect formation of fumed silica CMP slurries

2013 ◽  
Vol 436 ◽  
pp. 87-96 ◽  
Author(s):  
Nathan C. Crawford ◽  
S. Kim R. Williams ◽  
David Boldridge ◽  
Matthew W. Liberatore
Keyword(s):  
Fumed Silica ◽  
Defect Formation ◽  
Shear Thickening
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