Steady shear and dynamic strain thickening of halloysite nanotubes and fumed silica shear thickening composite

Passey, Pavni; Singh, Mansi; Verma, Sanjeev K.; Bhattacharya, Debarati; Mehta, Rajeev

doi:10.1515/polyeng-2018-0043

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…These modifiers can influence the viscosity in a significant way, even when used in small amounts [ 50 ]. The additives used include halloysite [ 51 ], aluminum oxide [ 52 ], cellulose nanofibers [ 53 ], silicon carbide [ 52 ], boron carbide [ 52 ], carbon nanotubes [ 18 ], graphene and graphene oxide [ 54 , 55 ], expanded graphite [ 56 , 57 ], or poly(propylene glycol) diacetate [ 58 ]. Often, the material property modifier can also be silica itself, e.g., in multiphase fluids [ 59 ].…”

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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“…The introduction of silica-nanoparticles into silicone forms a uniform 3D network structure with "bridges" composed of sil-ica─silicone─silica bonds. [35][36][37][38][39] Subsequently, the viscosity of the silicone ink is significantly increased making it printable. Meanwhile, the modulus of the solid silicone is increased.…”

Section: Principle Of Hybrid 3d Printingmentioning

confidence: 99%

Hybrid Printed Rigidity‐Programmable Substrate/Liquid Metal 3D Circuits Toward Stretchable Electronics

Liu,

Chen,

Jin

et al. 2024

Adv Elect Materials

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Stretchable electronics have the unique capability of 3D (three dimensional) deformation, overcoming the brittleness of traditional inorganic electronics. However, during large deformations, different scale strains between the rigid and stretchable components lead to mismatch, causing interconnect failures. Therefore, the development of the rigidity‐programmable substrate with effective strain shielding capabilities has become a research hotspot. Furthermore, the exponential growth in electronic density presents challenges in the circuit design of stretchable electronics. The urgent need is to develop highly integrated stretchable electronic systems. In this study, a highly integrated stretchable pulse sensor with effective strain shielding capabilities using hybrid 3D printing technology is developed, which comprises electronic chips, a rigidity‐programmable substrate/encapsulation layer printed by using PSC (polydimethylsiloxane/silica‐nanoparticles composite)‐based ink, and LM (liquid metal)‐based 3D circuits. First, the PSC‐based ink is optimized to enhance the strain shielding effectiveness of the rigidity‐programmable substrate. Meanwhile, 3D printing parameters are optimized to achieve high printing precision with minimum line widths below 100 µm. The resulting stretchable pulse sensor demonstrated good mechanical and electrical stability under complex 3D deformations, including bending, twisting, and stretching. The PSC region strain of the sensor is only ≈2% when the global strain is up to ≈65%, which exhibited effective strain shielding capabilities.

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“…However, additives offer simple operation and various adjusting options. There are numerous forms of additives in STF, including surfactants [14][15][16][17] ; carbon materials [18][19][20][21] ; nanoparticles [22][23][24] ; and media/charged particles with varying alkalinity and acidity. 25,26 Generally, the addition of additives improves the shear-thickening performance of STF.…”

Section: Literature and Motivationmentioning

confidence: 99%

Optimization of SiC-based shear thickening fluids behavior using a mathematical approach

Sofuğlu,

Sağır

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The study focuses on an optimization study motivated by the increasing significance of shear-thickening fluids (STFs). We investigated the effects of parameters like additive surface area, additive ratio, and suspension temperature on outputs such as viscosity, thickening ratio, critical shear rate and thickening period of STFs using SiC as the additive. Enhancing STFs with SiC betters their stability and mechanical properties, ideal for industrial and defense applications. Our methodology has two steps. In the first step we developed a regression equation for each output by using some experimental data, then as the second step, each regression equation is used as an objective function and mathematical models are developed where the constraints represent the lower and upper bounds of the related inputs such as the surface area, amount of additive and, the surface area. Therefore, we want to obtain the best value of each input for each objective. The model’s results vary depending on the specific data and parameters used. This is a pioneering study employing both regression equations and mathematical models for this analysis.

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Steady shear and dynamic strain thickening of halloysite nanotubes and fumed silica shear thickening composite

Cited by 3 publications

References 39 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

Hybrid Printed Rigidity‐Programmable Substrate/Liquid Metal 3D Circuits Toward Stretchable Electronics

Optimization of SiC-based shear thickening fluids behavior using a mathematical approach

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