Biomimetic Soft Multifunctional Miniature Aquabots

Kwon, Gu Han; Park, Joong Yull; Kim, Jeong‐Yoon; Frisk, Megan; Beebe, David J.; Lee, Sang Hoon

doi:10.1002/smll.200800315

Cited by 161 publications

(124 citation statements)

References 24 publications

(21 reference statements)

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“…Examples include swellable hydrogels sensitive to either temperature (Hu et al, 1995) or electric-field (Kwon et al, 2008), electroactive polymers (Jager et al, 2000), liquid-crystal elastomers (Warner and Terentjev, 2007;DeSimone and Teresi, 2009) actuated by temperature (deHaan et al, 2012), light (White et al, 2008;Camacho-Lopez et al, 2004), or electric field (Fukunaga et al, 2008), and biohybrid constructs consisting of muscle cells attached to elastomer sheets (Feinberg et al, 2007;Nawroth et al, 2012). Bioinspiration plays an important role in this field.…”

Section: Introductionmentioning

confidence: 99%

Shape control of active surfaces inspired by the movement of euglenids

Arroyo

DeSimone

2014

Journal of the Mechanics and Physics of Solids

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We examine a novel mechanism for active surface morphing inspired by the cell body deformations of euglenids. Actuation is accomplished through in-plane simple shear along prescribed slip lines decorating the surface. Under general non-uniform actuation, such local deformation produces Gaussian curvature, and therefore leads to shape changes. Geometrically, a deformation that realizes the prescribed local shear is an isometric embedding. We explore the possibilities and limitations of this bioinspired shape morphing mechanism, by first characterizing isometric embeddings under axisymmetry, understanding the limits of embeddability, and studying in detail the accessibility of surfaces of zero and constant curvature. Modeling mechanically the active surface as a non-Euclidean plate (NEP), we further examine the mechanism beyond the geometric singularities arising from embeddability, where mechanics and buckling play a decisive role. We also propose a non-axisymmetric actuation strategy to accomplish large amplitude bending and twisting motions of elongated cylindrical surfaces. Besides helping understand how euglenids delicately control their shape, our results may provide the background to engineer soft machines.

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Section: Introductionmentioning

confidence: 99%

Shape control of active surfaces inspired by the movement of euglenids

Arroyo

DeSimone

2014

Journal of the Mechanics and Physics of Solids

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“…T he ability to control and programme the shape of soft materials, such as gels, can enable the development of artificial muscles 1,2 , micropatterned and shape-transforming sheets 3,4 , enviro intelligent sensors and actuators [5][6][7][8] , biomimetic microbots [9][10][11] , cell scaffolds 12,13 and drug delivery systems 14,15 . Hydrogels are networks of crosslinked hydrophilic polymers capable of absorbing and releasing large amounts of water while maintaining their structural integrity.…”

mentioning

confidence: 99%

Reversible patterning and actuation of hydrogels by electrically assisted ionoprinting

et al. 2013

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The ability to pattern, structure, re-shape and actuate hydrogels is important for biomimetics, soft robotics, cell scaffolding and biomaterials. Here we introduce an 'ionoprinting' technique with the capability to topographically structure and actuate hydrated gels in two and three dimensions by locally patterning ions via their directed injection and complexation, assisted by electric fields. The ionic binding changes the local mechanical properties of the gel to induce relief patterns and, in some cases, evokes localized stress large enough to cause rapid folding. These ionoprinted patterns are stable for months, yet the ionoprinting process is fully reversible by immersing the gel in a chelator. The mechanically patterned hydrogels exhibit programmable temporal and spatial shape transitions, and serve as a basis for a new class of soft actuators that can gently manipulate objects both in air and in liquid solutions.

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“…Intelligent materials with changing properties and functions have been studied in many fields [1][2][3][4][5][6][7][8][9][10]. Recently, molecular devices fabricated by taking advantage of DNA base sequences have been much investigated, because molecular programming can be performed by utilizing DNA [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Autonomous Oscillation of Nonthermoresponsive Polymers and Gels Induced by the Belousov–Zhabotinsky Reaction

Hara

2013

Chemosensors

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This review introduces the self-oscillating behavior of two types of nonthermoresponsive polymer systems with Ru catalyst moieties for the BelousovZhabotinsky (BZ) reaction: one with a poly-vinylpyrrolidone (PVP) main chain, and the other with a poly(2-propenamide) (polyacrylamide) (PAM) main chain. The amplitude of the VP-based self-oscillating polymer chain and the activation energy for self-oscillation are hardly affected by the initial concentrations of the BZ substrates. The influences of the initial concentrations of the BZ substrates and the temperature on the period of the swelling-deswelling self-oscillation are examined in detail. Logarithmic plots of the period against the initial concentration of one BZ substrate, when the concentrations of the other two BZ substrates are fixed, show good linear relationships. The period of the swellingdeswelling self-oscillation decreases with increasing temperature, in accordance with the Arrhenius equation. The maximum frequency (0.5 Hz) of the poly(VP-co-Ru(bpy) 3 ) gel is 20 times that of the poly(NIPAAm-co-Ru(bpy) 3 ) gel. It is also demonstrated that the amplitude of the volume self-oscillation for the gel has a tradeoff with the self-oscillation period. In addition, this review reports the self-oscillating behavior of an AM-based self-oscillating polymer chain as compared to that of the VP-based polymer chain.

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Biomimetic Soft Multifunctional Miniature Aquabots

Cited by 161 publications

References 24 publications

Shape control of active surfaces inspired by the movement of euglenids

Shape control of active surfaces inspired by the movement of euglenids

Reversible patterning and actuation of hydrogels by electrically assisted ionoprinting

Autonomous Oscillation of Nonthermoresponsive Polymers and Gels Induced by the Belousov–Zhabotinsky Reaction

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