A high frequency photodriven polymer oscillator

White, Timothy J.; Tabiryan, Nelson V.; Serak, Svetlana V.; Hrozhyk, Uladzimir A.; Tondiglia, Vincent P.; Koerner, Hilmar; Vaia, Richard A.; Bunning, Timothy J.

doi:10.1039/b805434g

Cited by 432 publications

(376 citation statements)

References 12 publications

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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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“…Photomechanical responses in azo-LCN materials have been most often observed as uniaxial contraction of a film (typically elastomers-large strain) [6,[17][18][19] or bending of a cantilever (typically glasses-lower strain) [7][8][9][10][11][12][13][14][15][16]. The magnitude or directionality of the photomechanical response of azo-LCN materials has repeatedly been controlled by the alignment of the linear polarization of the actinic source and the sample geometry [8,9,11,12,[14][15][16].…”

Section: Open Accessmentioning

confidence: 99%

“…Since this work, considerable effort has pursued a variety of aspects of this unique means of transducing energy in primarily liquid crystalline materials. Notably, this research has expanded into looking at glassy, azobenzene-functionalized liquid crystal polymers [7][8][9][10][11][12][13][14][15][16]. To capture both elastomeric and glassy liquid crystalline systems, we refer to the broader area as azobenzene-functionalized liquid crystal polymer networks (azo-LCN) and emphasize the glassy or elastomeric nature of the given chemistry.…”

Section: Open Accessmentioning

confidence: 99%

Photomechanical Response of Composite Structures Built from Azobenzene Liquid Crystal Polymer Networks

Lee

White

2011

Polymers

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Abstract:Optically directed shape adaptive responses have been sought after for many decades in photoresponsive polymeric materials. A number of recent examinations have elucidated elucidated the unique opportunities of photomechanical responses realized in azobenzene-functionalized liquid crystalline polymer networks (both elastomers and glasses). This work summarizes and contrasts the photomechanical response of glassy polydomain, monodomain, and twisted nematic azo-LCN materials to blue-green irradiation. Building from this summary, the combinatorial photomechanical response observed upon irradiation of composite cantilevers is examined. Large scale shape adaptations are realized, with novel responses that may be of potential use in future employment of these materials in actuation.

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“…Further works focused on the utilization of densely cross-linked LC polymers for the conversion of light into mechanical work. [232][233][234][235][236][237][238] In this regard, many researches focused on the development of azo-cantilever oscillators based on densely cross-linked polymer networks that work with artificial light or even with direct sunlight. [232][233][234][235][236] LC GELS Two types of LC gels have been reported: LC chemical gels and LC physical gels (Figure 14a).…”

Section: Functional Lc Polymers and Networkmentioning

confidence: 99%

“…[232][233][234][235][236][237][238] In this regard, many researches focused on the development of azo-cantilever oscillators based on densely cross-linked polymer networks that work with artificial light or even with direct sunlight. [232][233][234][235][236] LC GELS Two types of LC gels have been reported: LC chemical gels and LC physical gels (Figure 14a). While LC chemical gels are composed of conventional liquid crystals (liquid crystal solvent) and cross-linked LC polymers, 239,240 for LC physical gels, liquid crystals are mixed with low-molecular weight gelators that form self-assembled fibrous networks.…”

Section: Functional Lc Polymers and Networkmentioning

confidence: 99%

Functional liquid-crystalline polymers and supramolecular liquid crystals

Kato

Uchida

Ichikawa

et al. 2017

Polym J

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The design and functions of liquid-crystalline (LC) polymers with classifying them into conventional-, supramolecular-, dendriticand network-type LC polymers are described. LC polymers show new functions as new devices in the field of energy and environment by incorporating mesogenic moieties exhibiting photonic, electronic and ionic functions. Supramolecular LC polymers show dynamic and unique properties because the mesogenic moieties are built with non-covalent interactions. Dendritic-type LC polymers exhibit liquid crystallinity by nanosegregation of aromatic and aliphatic moieties. Dendritic fork-like mesogens have also been prepared. A variety of nonmesogeic functional building blocks including fullerene, π-conjugated moieties, catenane, rotaxane and others can be incorporated into LC phases by attaching these dendritic moieties. LC networks are constructed in situ polymerization of polymerizable nematic or nanostructured liquid crystals. The specific characteristics of the LC networks have generated new research trends to develop well-defined polymers that exhibit optical, transport and separation properties. In these materials, through suitable design of LC monomers, the preservation of smectic, columnar and bicontinuous cubic phases has been successfully used for the development of membranes with one-dimensional, two-dimensional and three-dimensional nanostructures.

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A high frequency photodriven polymer oscillator

Cited by 432 publications

References 12 publications

Shape control of active surfaces inspired by the movement of euglenids

Shape control of active surfaces inspired by the movement of euglenids

Photomechanical Response of Composite Structures Built from Azobenzene Liquid Crystal Polymer Networks

Functional liquid-crystalline polymers and supramolecular liquid crystals

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