Giant Rheological Effect of Shear Thickening Suspension Comprising Silica Nanoparticles with No Aggregation

Li, Shuangbing; Wang, Jixiao; Zhao, Song; Cai, Wei; Wang, Zhi; Wang, Shichang

doi:10.1016/j.jmst.2016.06.008

Cited by 15 publications

(7 citation statements)

References 45 publications

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“…4 , the FTIR spectrum of SNP presents the characteristic adsorption peaks at 1068 cm −1 (Si–O–Si stretching vibration), 955 cm −1 (Si–OH bending vibration) and 794 cm −1 (Si–O stretching vibration), in agreement with the results reported in literature. 29 After modification by PDA and poly(GHPEI), a new absorption peak appear at 1648 cm −1 for the spectrum of SNP@PG, which may be ascribed to the overlay of C N stretching vibration and –NH x bending vibration from poly(GHPEI). 33,34 …”

Section: Resultsmentioning

confidence: 95%

“…Secondly, the SNPs were prepared according to the method reported in literature. 29 Typically, 100 mL absolute ethanol, 3.4 g deionized water and 1.8 g ammonium hydroxide were mixed in a 250 mL three-necked flask which was put in a 30 °C thermostatic water-bath and stirred for 30 min. Then 0.52 g tetraethoxysilane (TEOS) was added to the flask, and the reaction was conducted for 3 h. After that, 54 g deionized water was added into the flask and vigorously mixed.…”

Section: Methodsmentioning

confidence: 99%

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Hydrophilic and antimicrobial core–shell nanoparticles containing guanidine groups for ultrafiltration membrane modification

et al. 2018

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Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Hydrophilic and antimicrobial core–shell nanoparticles containing guanidine groups for ultrafiltration membrane modification

et al. 2018

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“…Shear-thickening fluids (STFs) and polymers (STPs) are non-Newtonian (figure 3). The viscosity of these materials increases with shear strain rate [273][274][275][276]. STFs include suspensions [273] and gels [277], while STPs (which are more commonly used in consumer products) are viscoelastic solids [275,276,278].…”

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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“…Shear thickening materials can be soft during normal use, improving comfort, and stiffen to adapt to the severity of an impact [73][74][75][76]. Shear thickening fluids are typically either suspensions or crosslinked gels [77,78]. Various shear thickening gels (STGs) have been developed, often polyborosiloxanes (PBSs) [79][80][81].…”

Section: Introductionmentioning

confidence: 99%

Indentation and impact response of conventional, auxetic, and shear thickening gel infused auxetic closed cell foam

Parisi

Allen

Colonna

et al. 2023

Smart Mater. Struct.

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Auxetic closed cell foams, and highly viscoelastic foams, both show potential to improve impact protection. Specifically, auxetics adapt to the shape of impacting bodies, while highly viscoelastic foams stiffen during severe impacts. So, we made auxetic closed cell foam sheets, including those that were infused with (highly viscoelastic) shear thickening gel. We then undertook comparative quasistatic and impact (drop) tests. Quasisatic tests included compression, tension and indentation. Impact tests were with a flat faced impactor at energies of 1, 3 and 5 J, and a 50 mm diameter hemisphere at 1 and 3 J. Poisson’s ratios of the foams were obtained by optical fullfield strain measurement. An analytical model was used to separate the contribution of the various measured orthotropic properties during the hemispherical impact and indentation tests. The Poisson’s ratios of the converted foams (both with and without shear thickening gel) were close to zero or marginally negative when measured through thickness. Planar values of Poisson’s ratio (measured in tension) were as low as −0.6. Through thickness Young’s moduli of the converted foams were 0.5 MPa, and planar moduli were ~12 times higher. The auxetic foams outperformed the unconverted ones during the more severe impacts, exhibiting about half the peak force during the 3 J hemispherical impacts (2.5 vs. 5 kN). The reduction in peak force was related to a measured doubling in indentation resistance for the auxetic foam. The analytical model suggests that 7 to 15% of the measured doubling in indentation resistance was due to (negative) Poisson’s ratio. Infusing the auxetic foams with shear thickening gel caused, at best, a marginal reduction in peak impact force, attributed to low and non-uniform levels of infusion.

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Giant Rheological Effect of Shear Thickening Suspension Comprising Silica Nanoparticles with No Aggregation

Cited by 15 publications

References 45 publications

Hydrophilic and antimicrobial core–shell nanoparticles containing guanidine groups for ultrafiltration membrane modification

Hydrophilic and antimicrobial core–shell nanoparticles containing guanidine groups for ultrafiltration membrane modification

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

Indentation and impact response of conventional, auxetic, and shear thickening gel infused auxetic closed cell foam

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