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

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.

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Effect of particle size of fumed silica on the puncture resistance of fabrics impregnated with shear thickening fluid

Journal of Engineered Fibers and Fabrics ◽

10.1177/15589250211061393 ◽

2021 ◽

Vol 16 ◽

pp. 155892502110613

Author(s):

Zhenqian Lu ◽

Zishun Yuan ◽

Jiawen Qiu

Keyword(s):

Particle Size ◽

Fumed Silica ◽

Shear Thickening ◽

Weight Fraction ◽

Areal Density ◽

Woven Fabrics ◽

Body Armor ◽

Shear Thickening Fluid ◽

Puncture Resistance ◽

Effect Of Particle Size

This paper presents an investigation into the effect of particle size of fumed silica on the puncture resistance of fabric impregnated with shear thickening fluid (STF). Two different types of STF were fabricated from fumed silica nanoparticles with particle sizes of 12 and 40 nm respectively. The effects of the particle size and weight fraction of the fumed silica on the rheological property were studied. STFs impregnated woven fabrics were fabricated and tested for stabbing resistance. STFs made of fumed silica with large particle size have better shear thickening effect. The stabbing resistant performance of STF impregnated fabrics improved notably with the same number of layers of fabric, and STFs impregnated fabric panels also outperform the untreated fabric panels with the same areal density. The results indicated that STFs made of fumed silica with larger particle size is able to fabricate a lighter soft body armor with higher stabbing protection.

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Effect of molecular weight of polyethylene glycol on the rheological properties of fumed silica-polyethylene glycol shear thickening fluid

Materials Research Express ◽

10.1088/2053-1591/aac25c ◽

2018 ◽

Vol 5 (5) ◽

pp. 055704 ◽

Cited By ~ 2

Author(s):

Mansi Singh ◽

Sanjeev K Verma ◽

Ipsita Biswas ◽

Rajeev Mehta

Keyword(s):

Molecular Weight ◽

Polyethylene Glycol ◽

Rheological Properties ◽

Fumed Silica ◽

Shear Thickening ◽

Shear Thickening Fluid

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Development of Flexible Extremities Protection utilizing Shear Thickening Fluid/Fabric Composites

10.21236/ada571815 ◽

2012 ◽

Author(s):

Mahesh Hosur ◽

Norman Wagner ◽

C. T. Sun ◽

Vijaya Rangari ◽

Jack Gillespie ◽

...

Keyword(s):

Shear Thickening ◽

Shear Thickening Fluid ◽

Fabric Composites

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Dynamic compressive response of 3D GFRP composites with shear thickening fluid (STF) matrix as cushioning materials

Journal of Composite Materials ◽

10.1177/0021998320984247 ◽

2021 ◽

pp. 002199832098424

Author(s):

Mohsen Jeddi ◽

Mojtaba Yazdani

Keyword(s):

Shear Thickening ◽

Low Velocity Impact ◽

Gfrp Composites ◽

High Concentration ◽

Low Velocity ◽

Shear Thickening Fluid ◽

Compressive Response ◽

Reinforced Polymer ◽

Glass Fiber Reinforced ◽

Shear Thickening Fluids

Whereas most previous studies have focused on improving the penetration resistance of Shear Thickening Fluids (STFs) treated composites, in this study, the dynamic compressive response of single and multi-ply 3 D E-Glass Fiber Reinforced Polymer (GFRP) composites with the STF matrix was investigated by using a drop-weight low-velocity impact test. The experimental results revealed the STF improved the compressive and cushioning performance of the composites such that with increasing its concentration, further improvement was observed. The five-ply composite containing the STF of 30 wt% silica nanoparticles and 1 wt% carbon nanotubes (CNTs) reduced the applied peak force by 56% and 26% compared to a steel plate and five-ply neat samples, respectively. A series of repeated impacts was performed, and it was found that the performance of high-concentration composites is further decreased under this type of loading.

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