Effects of pH on shear thinning and thickening behaviors of fumed silica suspensions

Shan, Lei; Tian, Yu; Jiang, Jile; Zhang, Xiangjun; Meng, Yonggang

doi:10.1016/j.colsurfa.2014.09.040

Cited by 32 publications

(16 citation statements)

References 49 publications

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“…Chen et al 140 studied the effect of acidity or basicity of polystyrene-ethylacrylate colloidal dispersion on its thickening behaviour and found out that critical shear rate decreases with decreasing pH on acid addition, while the opposite was found for alkali added STF samples. A related work by Shan et al 141 showed similar results. The authors prepared 20% (w/w) STF using fumed silica and used diluted HCl and NaOH to control the pH of STF between 2 and 12.…”

Section: Parameters Inuencing Shear Thickening Behavioursupporting

confidence: 66%

A review of fibrous materials for soft body armour applications

2020

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Section: Parameters Inuencing Shear Thickening Behavioursupporting

confidence: 66%

A review of fibrous materials for soft body armour applications

2020

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“…Further increase in shear stress leads to aggregating the particles due to formation of hydroclusters. The suspensions turned back to their original easy flowing state, when the applied stress has been removed (Egres and Wagner 2005;Fahool and Sabet 2015;Shan et al 2015;Crawford et al 2013b;White et al 2010;Lim et al 2010;Saito et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Tuning of the rheological properties of concentrated silica suspensions using carbon nanotubes

Hasanzadeh

Mottaghitalab

2016

Rheol Acta

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In this study, the rheological behavior of fumed silica nanoparticles suspended in polyethylene glycol (PEG) and those containing multi-walled carbon nanotubes (MWNTs) was measured at steady and oscillatory shear stress using a stress-controlled rheometer. The obtained results showed that the critical viscosity of the concentrated silica suspension, decreased with the addition of MWNTs. Moreover, the onset of shear thickening for the suspension containing MWNTs appeared at higher shear rate than those without MWNTs. Oscillatory shear measurement shows that the storage modulus and loss modulus of silica suspension were higher than the suspension containing MWNTs. The higher complex viscosity of silica suspensions than the suspension containing MWNTs was also evident over the entire range of the frequency studied. The proposed mechanism of nanotube incorporation in dispersion revealed that the observed shear-thickening behavior of a suspension containing MWNTs could be attributed to the increased interaction force between MWNTs and PEG, as a result of increase in the number of hydrogen bonds. This finding suggests that MWNTs could be used as an efficient tool for tuning of the onset of shear thickening and rheological behavior of concentrated silica suspensions.

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“…STFs are specific type of non-Newtonian fluids whose viscosity increases dramatically with increasing shear rate and act like solids. However, after removal of shear stress, STFs reverse their status to liquid-like as soon as shear removes [19][20][21][22][23]. Extensive analysis of failure modes during the quasi-static puncture and yarn pull-out experiments as well as the rheological properties of several STF systems have shown that improved ballistic and stab resistance performance in STF-treated fabrics is extremely attributed to the inherent shear-thickening behavior.…”

Section: Introductionmentioning

confidence: 99%