Tactile device based on opto-mechanical actuation of liquid crystal elastomers

Torras, Núria; Zinoviev, Kirill; Camargo, Carlos J.; Campo, Eva M.; Campanella, Humberto; Estéve, J.; Marshall, Jean E.; Terentjev, E. M.; Omastová, Mária; Krupa, Igor; Teplický, Peter; Mamojka, B.; Bruns, Patrick; Roeder, Brigitte; Vallribera, M.; Malet, R.; Zuffanelli, Simone; Soler, V.; Roig, Jordi; Walker, Natalie; Wenn, D.; Vossen, F. J.; Crompvoets, Floris M. H.

doi:10.1016/j.sna.2014.01.012

Cited by 76 publications

(56 citation statements)

References 20 publications

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“…Accordingly, LCE films can be anchored to rigid substrates without incurring stress or delamination at the perimeter for these λs. Anchoring shape-morphing LCE films is expected to be critical in allowing the integration of these materials into a range of proposed applications such as haptic displays [8], microfluidic pumps [25], or reconfigurable optical devices [26]. A few anchorable profiles have been proposed in [14].…”

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confidence: 99%

Curvature by design and on demand in liquid crystal elastomers

et al. 2018

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The shape of liquid crystalline elastomers (LCEs) with spatial variation in the director orientation can be transformed by exposure to a stimulus. Here, informed by previously reported analytical treatments, we prepare complex spiral patterns imprinted into LCEs and quantify the resulting shape transformation. Quantification of the stimuli-induced shapes reveals good agreement between predicted and experimentally observed curvatures. We conclude this communication by reporting a design strategy to allow LCE films to be anchored at their external boundaries onto rigid substrates without incurring internal, mechanical-mismatch stresses upon actuation, a critical advance to the realization of shape transformation of LCEs in practical device applications.Liquid crystal elastomers (LCEs) are exciting materials that show promise for enabling multifunctional character in flexible devices. The mechanical response of these materials is inherently and programmably anisotropic, governed by the molecular-level liquid crystalline orientation. This generates a rich variety of reversible, shape-morphing behaviors [1] with large strains

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confidence: 99%

Curvature by design and on demand in liquid crystal elastomers

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“…There are a wide range of liquid materials that have been used to realize functional haptic devices. These include liquid alloy, rheological fluids, liquid crystals, and gels . Many of these emerging materials demonstrate special functionality which is preferable for some particular applications.…”

Section: Emerging Materials For Haptic Devicesmentioning

confidence: 99%

“…A number of LCE based actuators have been demonstrated for different applications including refreshable Braille displays, tactile sensors, or soft robotics . As one example, Rogóż et al developed a soft robot based on LCE that could mimic caterpillar locomotion.…”

Section: Physical Principles Of Actuation Via Emerging Materialsmentioning

confidence: 99%

“…Liquid crystal elastomers are particularly amenable to applications for tactile displays, since they can be easily rendered refreshable. At the same time the devices can be soft, light, and portable . As discussed earlier, the stimulation of LCE can be performed in different manners.…”

Section: Tactile Displays Based On Emerging Materialsmentioning

confidence: 99%

“…However, their device possessed a relatively longer recovery time (6 s), which might be considered as a drawback of the system. A similar method was used by Torras et al to realize another tactile display …”

Section: Tactile Displays Based On Emerging Materialsmentioning

confidence: 99%

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The sense of touch is involved in nearly all human activities, but information technologies for displaying tactile sensory information to the skin are rudimentary when compared to state‐of‐the‐art video and audio displays, or to tactile perceptual capabilities. Realizing tactile displays with good perceptual fidelity will require major advances in engineering, design, and fabrication. Research over several decades has highlighted the difficulties of meeting the required performance benchmarks using conventional devices, processes, and techniques. This has highlighted the important role that will be played by new material technologies that can bridge the electronic and mechanical domains. This must occur at the smallest scales, because of the great perceptual spatial and temporal acuity of the sense of touch. The requirements involved also furnish valuable performance benchmarks against which many emerging material technologies are being evaluated. This article highlights recent research and possibilities enabled through new material technologies, ranging from organic electronic materials, to carbon nanomaterials, and a variety of composites. Emerging material technologies are surveyed for the sense of touch, including sensory considerations and requirements, materials, actuation principles, and design and fabrication methods. A conclusion reflects on the main open challenges and future prospects for research in this area.

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Tactile device based on opto-mechanical actuation of liquid crystal elastomers

Cited by 76 publications

References 20 publications

Curvature by design and on demand in liquid crystal elastomers

Curvature by design and on demand in liquid crystal elastomers

Emerging Material Technologies for Haptics

A Historical Overview of Photomechanical Effects in Materials, Composites, and Systems

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