Cholesteric materials with photonic band gap sensitive to shear deformation and mechanical sensors

Shibaev, Petr; Schlesier, Cristina; Uhrlass, Robert; Woodward, Sean; Hanelt, Eckhard

doi:10.1080/02678292.2010.522737

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…The properties of polymer=MBBA system and dependence of viscosity on concentration of MBBA was studied in previous publications [1][2][3]. Here we mainly focus on the properties of composites filled with nanoparticles.…”

Section: Resultsmentioning

confidence: 98%

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Deformable Viscoelastic Cholesteric Films with Nanoparticles

Shibaev

Schlesier

Hanelt³

et al. 2011

Molecular Crystals and Liquid Crystals

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Large spectral shifts of the selective reflection band and color changes are achieved in highly viscous mixture of cholesteric polymers and low molar mass liquid crystals filled with nanoparticles and subject to mechanical deformations. The color of the material changes instantaneously during deformation; the time for the color to be completely restored increased with the viscosity of the polymer mixture. The viscosity increases with increasing concentration of polymer or nanoparticles. These properties of the material were explored in building a highly sensitive mechanical sensor.

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Section: Resultsmentioning

confidence: 98%

“…Highly viscous cholesteric liquid crystals (CLCs) sensitive to mechanical deformation, stretching, and shear were recently studied in [1][2][3][4]. In these materials high viscosity plays a crucial role in determining their peculiar mechanical response.…”

Section: Introductionmentioning

confidence: 99%

Deformable Viscoelastic Cholesteric Films with Nanoparticles

Shibaev

Schlesier

Hanelt³

et al. 2011

Molecular Crystals and Liquid Crystals

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“…After applying a mechanical strain onto the CLCE, they succeeded in tuning the lasing wavelength (≈50 nm). [190] By using a CLCE, they conducted proof-of-concept experiments where the film was subjected to mechanical deformation by stretching, and thus the film exhibited a spontaneous color change which was completely recovered by removing the stretching after a certain duration. As highlighted above, the relationship between the helical pitch and the reflection wavelength can be described in Equation (12); thus, the lasing wavelength was tuned by mechanical strain.…”

Section: Wwwadvmattechnoldementioning

confidence: 99%

Flexible Multifunctional Sensors for Wearable and Robotic Applications

Xie

Hisano

Zhu

et al. 2019

Adv Materials Technologies

246

172

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This review provides an overview of the current state‐of‐the‐art of the emerging field of flexible multifunctional sensors for wearable and robotic applications. In these application sectors, there is a demand for high sensitivity, accuracy, reproducibility, mechanical flexibility, and low cost. The ability to empower robots and future electronic skin (e‐skin) with high resolution, high sensitivity, and rapid response sensing capabilities is of interest to a broad range of applications including wearable healthcare devices, biomedical prosthesis, and human–machine interacting robots such as service robots for the elderly and electronic skin to provide a range of diagnostic and monitoring capabilities. A range of sensory mechanisms is examined including piezoelectric, pyroelectric, piezoresistive, and there is particular emphasis on hybrid sensors that provide multifunctional sensing capability. As an alternative to the physical sensors described above, optical sensors have the potential to be used as a robot or e‐skin; this includes sensory color changes using photonic crystals, liquid crystals, and mechanochromic effects. Potential future areas of research are discussed and the challenge for these exciting materials is to enhance their integration into wearables and robotic applications.

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“…Recently, a gigantic shift of the SRB was achieved in highly viscous cholesteric liquid crystals placed between two flat silicone strips and stretched. [6][7][8][9] This system was shown also to exhibit lasing. 8,9 The major difference of such a system from cholesteric elastomers is the absence of crosslinks between molecules of cholesteric liquid crystals and the commercial availability of silicone monomers.…”

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confidence: 94%

Distant mechanical sensors based on cholesteric liquid crystals

Shibaev

Schlesier

2012

Applied Physics Letters

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The improved performance is demonstrated for mechanical sensors based on cholesteric paint covering elastic silicone substrate with imprinted grooves. Due to the presence of the grooves, the deformation of the substrate is translated to the deformation of the cholesteric paint differently along the grooves and perpendicular to them. The model is suggested to describe the anisotropy of deformations and color changes.

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Cholesteric materials with photonic band gap sensitive to shear deformation and mechanical sensors

Cited by 12 publications

References 17 publications

Deformable Viscoelastic Cholesteric Films with Nanoparticles

Deformable Viscoelastic Cholesteric Films with Nanoparticles

Flexible Multifunctional Sensors for Wearable and Robotic Applications

Distant mechanical sensors based on cholesteric liquid crystals

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