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

Singh, Mansi; Verma, Sanjeev K.; Biswas, Ipsita; Mehta, Rajeev

doi:10.1088/2053-1591/aac25c

Cited by 26 publications

(17 citation statements)

References 31 publications

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“…Silica is a primary choice as a solid phase for STF production [ 16 , 33 , 34 ], but other raw materials such as corn starch [ 35 ], calcium carbonate [ 36 ], titanium dioxide [ 37 ], polymethyl methacrylate [ 38 ], polystyrene [ 39 ], or ethyl polystyrene acrylate [ 40 ] are also used for this purpose. The continuous phase of an STF is usually ethylene glycol [ 41 , 42 ], poly(ethylene glycol) [ 32 , 43 , 44 ], propylene glycol [ 41 ], or poly(propylene glycol) [ 7 , 45 , 46 , 47 ]. There are also reports on the application of glycerin [ 48 ], ethanol [ 37 ], and even water [ 49 ].…”

Section: Introductionmentioning

confidence: 99%

Rheological and Technological Aspects in Designing the Properties of Shear Thickening Fluids

et al. 2021

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This work focuses on shear thickening fluids (STFs) as ceramic–polymer composites with outstanding protective properties. The investigation aims to determine the influence of raw material parameters on the functional properties of STFs. The following analyses were used to characterize both the raw materials and the STFs: scanning electron microscopy, dynamic light scattering, matrix-assisted laser desorption/ionization time-of-flight, chemical sorption analysis, rheological analysis, and kinetic energy dissipation tests. It was confirmed that the morphology of the solid particles plays a key role in designing the rheological and protective properties of STFs. In the case of irregular silica, shear thickening properties can be obtained from a solid content of 12.5 vol.%. For spherical silica, the limit for achieving shear thickening behavior is 40 vol.%. The viscosity curve analysis allowed for the introduction of a new parameter defining the functional properties of STFs: the technological critical shear rate. The ability of STFs to dissipate kinetic energy was determined using a unique device that allows pure fluids to be tested without prior encapsulation. Because of this, it was possible to observe even slight differences in the protective properties between different STFs, which has not been possible so far. During tests with an energy of 50 J, the dissipation factor was over 96%.

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Section: Introductionmentioning

confidence: 99%

Rheological and Technological Aspects in Designing the Properties of Shear Thickening Fluids

et al. 2021

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“…Many studies have been carried out for the preparation of STF by employing silica nanoparticles with polyethylene glycol (PEG). [13][14][15] The behavior of STF is influenced mainly by the molecular weight of PEG, size, and concentration of nano silica. The augmented thickening characteristic of STF is observed with increasing particle loading, whereas, thickening behavior decreases if the size of dispersed particles reduces.…”

Section: Magnetorheologicalmentioning

confidence: 99%

Impact behavior of aminosilane functionalized nanosilica based shear thickening fluid impregnated Kevlar fabrics

Katiyar

Nandi

Prasad

2021

J of Applied Polymer Sci

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In the present work, two types of shear thickening fluids have been synthesized by using neat and aminosilane functionalized silica nanoparticles and their viscosity curves have been obtained by the rheometer. Based on the values of peak viscosity of synthesized shear thickening fluids, the surface functionalized nanosilica based shear thickening fluid has been chosen as a best candidate due to the high viscosity for impregnation into the neat Kevlar of different layers viz. four (04) and eight (08) layers for velocity impact study. The experimental investigations reveal high energy absorption of shear thickening fluid impregnated Kevlar as compared to the neat Kevlar. The maximum energy absorption 62 J is achieved corresponding to the initial velocity 154 mÁs −1 for 08 layers shear thickening fluid impregnated Kevlar specimen. The data have also been analytically determined and validated with the experimental data. The experimental data have good agreement with the analytical data within the accuracy of around 15 to 20%. The present findings can have significant inferences towards the fabrication of shear thickening fluids using nanomaterials for numerous applications such as soft armors, dampers, nanofinishing and so forth.

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“…PEG came from lower (<1000) to higher (>1000) molecular weight. According to Singh et al [20] high molecular weight of PEG tends to produce a hydrophobic nature of membrane as it is considered as a thickening agent. While low molecular weight of PEG known as hygroscopic where it tends to absorb the moisture and mobile which help in penetrating deeply for formation of porous media [20].…”

Section: Introductionmentioning

confidence: 99%

“…According to Singh et al [20] high molecular weight of PEG tends to produce a hydrophobic nature of membrane as it is considered as a thickening agent. While low molecular weight of PEG known as hygroscopic where it tends to absorb the moisture and mobile which help in penetrating deeply for formation of porous media [20]. Varying the air gap during the fabrication process also act as a modification technique that affect the properties of produced membrane.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of High Performance PVDF Hollow Fiber Membrane Using Less Toxic Solvent at Different Additive Loading and Air Gap

et al. 2021

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Existing toxic solvents in the manufacturing of polymeric membranes have been raising concerns due to the risks of exposure to health and the environment. Furthermore, the lower tensile strength of the membrane renders these membranes unable to endure greater pressure during water treatment. To sustain a healthier ecosystem, fabrication of polyvinylidene fluoride (PVDF) hollow fiber membrane using a less toxic solvent, triethyl phosphate (TEP), with a lower molecular weight polyethylene glycol (PEG 400) (0–3 wt.%) additive were experimentally demonstrated via a phase inversion-based spinning technique at various air gap (10, 20 and 30 cm). Membrane with 2 wt.% of PEG 400 exhibited the desired ultrafiltration asymmetric morphology, while 3 wt.% PEG 400 resulting microfiltration. The surface roughness, porosity, and water flux performance increased as the loading of PEG 400 increased. The mechanical properties and contact angle of the fabricated membrane were influenced by the air gap where 20 cm indicate 2.91 MPa and 84.72°, respectively, leading to a stronger tensile and hydrophilicity surface. Lower toxicity TEP as a solvent helped in increasing the tensile properties of the membrane as well as producing an eco-friendly membrane towards creating a sustainable environment. The comprehensive investigation in this study may present a novel composition for the robust structure of polymeric hollow fiber membrane that is suitable in membrane technology.

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

Cited by 26 publications

References 31 publications

Rheological and Technological Aspects in Designing the Properties of Shear Thickening Fluids

Rheological and Technological Aspects in Designing the Properties of Shear Thickening Fluids

Impact behavior of aminosilane functionalized nanosilica based shear thickening fluid impregnated Kevlar fabrics

Fabrication of High Performance PVDF Hollow Fiber Membrane Using Less Toxic Solvent at Different Additive Loading and Air Gap

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