An excursion into the design space of biomimetic architectured biphasic actuators

Turcaud, Sébastien; Guiducci, Lorenzo; Fratzl, Peter; Bréchet, Y.; Dunlop, John W. C.

doi:10.3139/146.110517

Cited by 34 publications

(28 citation statements)

References 28 publications

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“…In order to create an actuator from a responsive material that moves in a more complex manner than simply changing its volume upon stimulation, it is necessary to control where these volume changes occur. This can be realized by physically constraining the responsive material so that actuation only occurs in a particular direction (or in a given region of the material), which can be done by combining this responsive material with less‐responsive or passive ones or by controlling the spatial distribution of the stimulating signal (e.g., moisture and temperature) . In one example of physical constraints, it has been shown that by reducing a graphene oxide fiber to hydrophobic graphene on only one side (e.g., the top half), a sensor could be made that curled upon changes in humidity; as a result of different response of the top (hydrophobic graphene) and bottom (hydrophilic graphene oxide) faces of the fiber toward moisture, the top face bent inward with increasing humidity .…”

mentioning

confidence: 99%

Programmable Actuation of Porous Poly(Ionic Liquid) Membranes by Aligned Carbon Nanotubes

Lin

Gong

Eder

et al. 2016

Adv Materials Inter

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confidence: 99%

Programmable Actuation of Porous Poly(Ionic Liquid) Membranes by Aligned Carbon Nanotubes

Lin

Gong

Eder

et al. 2016

Adv Materials Inter

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“…In another report, they demonstrated that bilayer cylinders formed by different polymers are able to bend in different direction depending on which polymer is swollen. This was demonstrated on example of hydrogel and organogel cylinder, which bend in one direction in water and in another direction in water‐miscible organic solvents . In fact, all reports show that the bilayer rod bends, where the border between parts is along the long axis, in the direction on non‐swollen side.…”

Section: Stimuli‐responsive Deformationmentioning

confidence: 87%

Stimuli‐Responsive Janus Particles

Synytska

Ionov

2013

Part & Part Syst Charact

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Due to their complex behavior, Janus particles became a highly attractive research topic. Particularly, interesting groups of Janus particles are the ones that are sensitive to external signals such as change of temperature, pH, light, etc. These Janus particles are able to dynamically assemble/disassemble to forming very complex structures or reversibly/irreversibly change their shape by folding/bending. Recent progress in this fascinating field is discussed.

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“…They are interesting examples for bioinspired materials design, as they typically operate without metabolic energy meaning that actuation is achieved through the arrangement or architecture of the underlying constituent materials (cellulose fibrils, hemicellulose, lignin, etc.) [3,4]. In other words, the material's architecture of the actuating tissue controls and guides the otherwise unspecific isotropic swelling of the single components [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Pressurized honeycombs as soft-actuators: a theoretical study

Guiducci

Fratzl

Bréchet

et al. 2014

J. R. Soc. Interface.

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The seed capsule of Delosperma nakurense is a remarkable example of a natural hygromorph, which unfolds its protecting valves upon wetting to expose its seeds. The beautiful mechanism responsible for this motion is generated by a specialized organ based on an anisotropic cellular tissue filled with a highly swelling material. Inspired by this system, we study the mechanics of a diamond honeycomb internally pressurized by a fluid phase. Numerical homogenization by means of iterative finite-element (FE) simulations is adapted to the case of cellular materials filled with a variable pressure fluid phase. Like its biological counterpart, it is shown that the material architecture controls and guides the otherwise unspecific isotropic expansion of the fluid. Deformations up to twice the original dimensions can be achieved by simply setting the value of input pressure. In turn, these deformations cause a marked change of the honeycomb geometry and hence promote a stiffening of the material along the weak direction. To understand the mechanism further, we also developed a micromechanical model based on the Born model for crystal elasticity to find an explicit relation between honeycomb geometry, swelling eigenstrains and elastic properties. The micromechanical model is in good qualitative agreement with the FE simulations. Moreover, we also provide the force-stroke characteristics of a soft actuator based on the pressurized anisotropic honeycomb and show how the internal pressure has a nonlinear effect which can result in negative values of the in-plane Poisson's ratio. As nature shows in the case of the D. nakurense seed capsule, cellular materials can be used not only as low-weight structural materials, but also as simple but convenient actuating materials.

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An excursion into the design space of biomimetic architectured biphasic actuators

Cited by 34 publications

References 28 publications

Programmable Actuation of Porous Poly(Ionic Liquid) Membranes by Aligned Carbon Nanotubes

Programmable Actuation of Porous Poly(Ionic Liquid) Membranes by Aligned Carbon Nanotubes

Stimuli‐Responsive Janus Particles

Pressurized honeycombs as soft-actuators: a theoretical study

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