Rheological properties and stability of shear thickening fluids based on silica and polypropylene glycol

Nakonieczna, Paulina; Wojnarowicz, Jacek; Wierzbicki, Ł.; Leonowicz, M.

doi:10.1088/2053-1591/ab455e

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…The structural stability of the STFs was studied using a Turbiscan Lab analyzer (Formulation, Toulouse, France) with the light λ = 880 nm (see [ 27 ]). Some of the STFs samples were tested in a sealed cylindrical glass vial to show the changes in the arrangement of particles over time.…”

Section: Methodsmentioning

confidence: 99%

Impact of the Carbon Nanofillers Addition on Rheology and Absorption Ability of Composite Shear Thickening Fluids

et al. 2020

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Synthesis and characterization of composite shear thickening fluids (STFs) containing carbon nanofillers are presented. Shear thickening fluids have attracted particular scientific and technological interest due to their unique ability to abruptly increase viscosity in the case of a sudden impact. The fluids have been developed as a potential component of products with high energy absorbing efficiency. This study reports on the rheological behavior, stability, and microstructure of the STFs modified with the following carbon nanofillers: multi-walled carbon nanotubes, reduced graphene oxide, graphene oxide, and carbon black. In the current experiment, the basic STF was made as a suspension of silica particles with a diameter of 500 nm in polypropylene glycol and with a molar mass of 2000 g/mol. The STF was modified with carbon nanofillers in the following proportions: 0.05, 0.15, and 0.25 vol.%. The addition of the carbon nanofillers modified the rheological behavior and impact absorption ability; for the STF containing 0.25 vol.% of carbon nanotubes, an increase of force absorption up to 12% was observed.

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Section: Methodsmentioning

confidence: 99%

Impact of the Carbon Nanofillers Addition on Rheology and Absorption Ability of Composite Shear Thickening Fluids

et al. 2020

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“…STFs include suspensions [273] and gels [277], while STPs (which are more commonly used in consumer products) are viscoelastic solids [275,276,278]. STPs adapt to impact severity [279,280]; they can be flexible and elastic during normal use and minor impacts, or stiffen and increase damping during severe impacts [273,281]. The viscosity change is reversible, providing an alternative to crushable foam over multiple impacts [282,283], with slow recovery potentially reducing rebound, impact duration, and various measures of injury risk [125,[133][134][135][136].…”

Section: Emerging Developmentsmentioning

confidence: 99%

Mechanical metamaterials for sports helmets: structural mechanics, design optimisation, and performance

Haid,

Foster,

Hart

et al. 2023

Smart Mater. Struct.

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Sports concussions are a public health concern. Improving helmet performance to reduce concussion risk is a key part of the research and development community response. Head impacts with compliant surfaces that cause long duration moderate or high linear and rotational accelerations are associated with a high rate of clinical diagnoses of concussion. As engineered structures with unusual combinations of properties, mechanical metamaterials are being applied to sports helmets, with the goal of improving impact performance and reducing brain injury risk. Replacing established helmet material (i.e., foam) selection with a metamaterials design approach (structuring material to obtain desired properties) allows development of near optimal properties. Objective functions based on up to date understanding of concussion could be applied to topology optimisation regimes, when designing mechanical metamaterials for helmets. Such regimes balance computational efficiency with predictive accuracy, both of which could be improved under high strains and strain rates to allow helmet modifications as knowledge of concussion develops. Researchers could also share mechanical metamaterial data, topologies and computational models in open, homogenised repositories, to improve the efficiency of their development.

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“…[21][22][23][24] Nakonieczna et al used ethylene glycol, 1,3-propanediol, glycerin, PEG, and polypropylene glycol with different molecular weights as the dispersion medium, and silicon powder with an average particle size of 100 nm as the solid phase, and used dynamic light scattering technology to measure Zeta potential, particle size distribution, steady state, and dynamic rheology. 25 It is shown that the different number of hydroxyl and oxygen atoms and the chain length and branch of the carrier have significant effects on the intermolecular interaction and the rheological properties of the suspension. [26][27][28] From the perspective of composition, in addition to the dispersed phase particles and the dispersion medium, an appropriate amount of additives can be added to the STF.…”

Section: Introductionmentioning

confidence: 99%

“…With the increase of the proportion of glycerol, the viscosity of the dispersing medium would increase, the critical shear rate of STF would decrease, and the phenomenon of shear thickening would become more obvious 21–24 . Nakonieczna et al used ethylene glycol, 1,3‐propanediol, glycerin, PEG, and polypropylene glycol with different molecular weights as the dispersion medium, and silicon powder with an average particle size of 100 nm as the solid phase, and used dynamic light scattering technology to measure Zeta potential, particle size distribution, steady state, and dynamic rheology 25 . It is shown that the different number of hydroxyl and oxygen atoms and the chain length and branch of the carrier have significant effects on the intermolecular interaction and the rheological properties of the suspension 26–28 …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of imidazolyl ionic liquid‐based shear thickening dispersion system

Cao

Luo

Xiao³

2020

J of Applied Polymer Sci

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Shear thickening liquid (STF) is a new nonNewtonian fluid widely used in industrial production. In this paper, a novel shear thickening and dispersing system, namely poly methyl methacrylate (PMMA)/1-butyl-3-methylimidazole hexa-fluorophosphate ([BMIM]PF 6), was prepared using ultrasonic with PMMA as the dispersing phase and [BMIM]PF 6 as the dispersing medium. The stability, thixotropic, reversibility, rheology, and viscoelasticity of the dispersion system was studied, respectively. The dispersed system has good stability. The dispersed system shows high response sensitivity to shear rate, as well as good reversibility to shear thickening. Compared with traditional silicon dioxide/polyethylene glycol dispersion system, PMMA/[BMIM]PF 6 dispersion system displays a significantly enhanced shear thickening effect. Nonionic surfactant triton X-100 of 4 wt% can greatly improve PMMA/[BMIM]PF 6 dispersion system's shear thickening behavior. This paper provides a new idea for the further development of protective materials by using STF.

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Rheological properties and stability of shear thickening fluids based on silica and polypropylene glycol

Cited by 5 publications

References 22 publications

Impact of the Carbon Nanofillers Addition on Rheology and Absorption Ability of Composite Shear Thickening Fluids

Impact of the Carbon Nanofillers Addition on Rheology and Absorption Ability of Composite Shear Thickening Fluids

Mechanical metamaterials for sports helmets: structural mechanics, design optimisation, and performance

Preparation and characterization of imidazolyl ionic liquid‐based shear thickening dispersion system

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