Actuators in Adaptronics

Janocha, Hartmut; LeLetty, R.; Claeyssen, F.; Engdahl, Göran; Hesselbach, Jürgen; Bulloug, William A.; Carlson, J. D.; Mazzoldi, Alberto; Carpi, Federico; Rossi, Danilo De; Seidel, H.; Kuhnen, Klaus; Würtz, Thomas

doi:10.1007/978-3-540-71967-0_6

Cited by 5 publications

(2 citation statements)

References 180 publications

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“…For this reason, magnetorheological (MR) [1,2] and electrorheological (ER) [3][4][5][6][7][8] fluids have emerged, which have the ability to control the fluid viscosity with external magnetic and electric fields, respectively. A continuous control of the viscosity would require additives, when using a common fluid [9][10][11] but without applying external force fields. For that reason, in this paper we focus on simulations of controlling the fluid viscosity [12][13][14][15][16][17][18] through infusing complex-shape functional particles [19][20][21][22] (like ferrous particles infused in MR or ER fluid) based on the concept of jamming [22][23][24][25][26][27][28][29][30] that takes place in randomly packed ensembles and therefore controls the damping characteristics [31][32][33] of generic fluids.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Shear-Thickening Fluids Using Variable Functional Star-Shaped Particles: A Molecular Dynamics Study

Salehin

Papanikolaou

2021

Materials

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Complex colloidal fluids, depending on constituent shapes and packing fractions, may have a wide range of shear-thinning and/or shear-thickening behaviors. An interesting way to transition between different types of such behavior is by infusing complex functional particles that can be manufactured using modern techniques such as 3D printing. In this paper, we perform 2D molecular dynamics simulations of such fluids with infused star-shaped functional particles, with a variable leg length and number of legs, as they are infused in a non-interacting fluid. We vary the packing fraction (ϕ) of the system, and for each different system, we apply shear at various strain rates, turning the fluid into a shear-thickened fluid and then, in jammed state, rising the apparent viscosity of the fluid and incipient stresses. We demonstrate the dependence of viscosity on the functional particles’ packing fraction and we show the role of shape and design dependence of the functional particles towards the transition to a shear-thickening fluid.

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Section: Introductionmentioning

confidence: 99%

Colloidal Shear-Thickening Fluids Using Variable Functional Star-Shaped Particles: A Molecular Dynamics Study

Salehin

Papanikolaou

2021

Materials

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“…For this reason, the magnetorheological (MR) [1,2] and electro-rheological (ER) [3][4][5][6][7][8] fluids emerged, that have the ability to control the fluid viscosity but needs external magnetic and electric fields, respectively. For a continuous control of viscosity, and by using a common fluid [9][10][11] but without applying external force fields, would require additive particulates that could provide such a viscosity control. For that reason, in this paper we focus on simulations of controlling the fluid viscosity [12][13][14][15][16][17][18] through infusing complex-shaped functional particles [19][20][21][22] (like the Ferrous particles infused in MR or ER fluid) based on the concept of jamming [22][23][24][25][26][27][28][29][30] that takes place in randomly packed ensembles and therefore control the damping characteristics [31][32][33] of generic fluids through 3D printed functional particles.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Shear Thickening Fluids Using Variable Shaped Functional Star Particles: A Molecular Dynamics Study

Salehin¹,

Xu²,

Papanikolaou³

2021

Preprint

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Complex colloidal fluids, depending on particulates’ shapes and packing fractions, may have a wide range of shear thinning and thickening behaviors. A particular interesting way to transition between different types of such behavior is by infusing functional complex particles that can be manufactured using modern techicques such as 3D printing. In this paper, we display 2D molecular dynamics simulations of such fluids with infused star-shaped functional particles, with variable leg length and number of legs, as they are infused in a non-interacting, coarse-grained fluid. We vary the packing fraction (ϕ) of the system, and for each different system we apply shear with various strain rate that turns the fluid into a jammed state and rise the apparent viscosity of fluid. We demonstrate the dependence of viscosity with the particles’ packing fraction. We show the role of shape and design dependence of the functional particles towards the transition to a shear thickening fluid .

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The Role of Molecular Polarizability in Designing Organic Piezoelectric Materials

et al. 2016

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Nowadays, piezoelectric materials have found various applications in fields like energy harvesting, precision mechanics and life sciences. In this regard organic molecules and their crystals are not explored in detail to be used as an alternative source for piezoelectric materials. Piezo‐coefficients of different H‐bond cluster were calculated. It was found that Sulfur Centered Hydrogen Bond (SCHB) complexes have the optimum hydrogen bond strength and dipole moment derivative for achieving maximum piezo‐response among the systems studied. Moreover, the computed piezo‐coefficient of Thiophenol‐nitrobenzene (SPH‐NBz) dimer was found to be 24.9 pm/V, greater than that of 2‐methyl‐4‐nitroaniline (14 pm/V), the organic crystal with the largest known piezoelectric response. A linear correlation between piezo‐coefficient and dipole moment/polarizability was established, suggesting that both dipole moment and polarizability of H‐bonded systems need to be considered carefully while designing high piezo materials. Keeping in mind the ubiquity of hydrogen bonds in chemistry, materials and biological systems, the present work emphasizes SCHB complexes to be considered and explored as efficient organic piezomaterials.

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Actuators in Adaptronics

Cited by 5 publications

References 180 publications

Colloidal Shear-Thickening Fluids Using Variable Functional Star-Shaped Particles: A Molecular Dynamics Study

Colloidal Shear-Thickening Fluids Using Variable Functional Star-Shaped Particles: A Molecular Dynamics Study

Colloidal Shear Thickening Fluids Using Variable Shaped Functional Star Particles: A Molecular Dynamics Study

The Role of Molecular Polarizability in Designing Organic Piezoelectric Materials

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