Biocompatible and Sustainable Optical Strain Sensors for Large‐Area Applications

Kamita, Gen; Frka‐Petesic, Bruno; Allard, Antoine; Dargaud, Marielle; King, Katie; Dumanlı, Ahu Gümrah; Vignolini, Silvia

doi:10.1002/adom.201600451

Cited by 114 publications

(144 citation statements)

References 37 publications

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“…Our simplified model allows capturing the linear deformation expected from an assembly of cholesteric domains of identical pitch and purely randomized orientations. Indeed, a small blue-shift would be otherwise expected from a film with a constant pitch distributed along various directions, [57] which validates our model. Interestingly, this model also captures the increase of the pitch as the tilt increases ( Figure 4B-D), which, in turns, using Bragg's and Snell laws, [57,70,71] explains the observed red-shift of the scattering at higher angles (Figures 2A,D and 3I-L and Figures S16 and S17, Supporting Information).…”

Section: Nanocrystal Filmssupporting

confidence: 81%

“…[56,57] With this technique, a collimated white light beam illuminates the sample at a defined angle and the scattering response from the sample is collected across a wide range of angles. [56,57] With this technique, a collimated white light beam illuminates the sample at a defined angle and the scattering response from the sample is collected across a wide range of angles.…”

Section: Nanocrystal Filmsmentioning

confidence: 99%

“…To account for the distortion of the cholesteric structure upon vertical compression, we use a simple compression model adapted from Ericksen-Leslie theory [57,69] (details in Section E, Supporting Information). Our simplified model allows capturing the linear deformation expected from an assembly of cholesteric domains of identical pitch and purely randomized orientations.…”

Section: Nanocrystal Filmsmentioning

confidence: 99%

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Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets

et al. 2017

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The self-assembly of cellulose nanocrystals is a powerful method for the fabrication of biosourced photonic films with a chiral optical response. While various techniques have been exploited to tune the optical properties of such systems, the presence of external fields has yet to be reported to significantly modify their optical properties. In this work, by using small commercial magnets (≈ 0.5-1.2 T) the orientation of the cholesteric domains is enabled to tune in suspension as they assemble into films. A detailed analysis of these films shows an unprecedented control of their angular response. This simple and yet powerful technique unlocks new possibilities in designing the visual appearance of such iridescent films, ranging from metallic to pixelated or matt textures, paving the way for the development of truly sustainable photonic pigments in coatings, cosmetics, and security labeling.

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Section: Nanocrystal Filmssupporting

confidence: 81%

Section: Nanocrystal Filmsmentioning

confidence: 99%

Section: Nanocrystal Filmsmentioning

confidence: 99%

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Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets

et al. 2017

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“…[1][2][3][4][5][6] For instance, cephalopods (squid, cuttlefish, www.advmatinterfaces.de strain sensors, such as incapability of information delivery, [35] humidity dependence, [19,22,25] and lack of scalability [15,23] and has various potential applications including stress, strain and bending sensors, data encryption and security labels. [1][2][3][4][5][6] For instance, cephalopods (squid, cuttlefish, www.advmatinterfaces.de strain sensors, such as incapability of information delivery, [35] humidity dependence, [19,22,25] and lack of scalability [15,23] and has various potential applications including stress, strain and bending sensors, data encryption and security labels.…”

Section: Introductionmentioning

confidence: 99%

A Patterned Mechanochromic Photonic Polymer for Reversible Image Reveal

Zhang

Shi

Schenning

et al. 2019

Adv Materials Inter

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octopus, and so on) are able to produce a wide range of structural colors and photonic patterns to signal and communicate with their own species and others. [4,7] Inspired by nature, scientific efforts have been devoted to develop smart photonic materials which inform the user by changing their structural color. [8][9][10] Mechanochromic photonic materials, which change structural color in response to mechanical stimuli, are attractive for a wide range of applications such as strain mapping, [11,12] stress sensing, [13][14][15][16] anti-counterfeiting, [17][18][19] tunable optical devices, [20,21] and so on. Different materials, such as inorganic, polymeric, and hybrid components have been used to fabricate these mechanochromic photonic devices. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Among these smart materials, cholesteric liquid crystals (CLCs) have garnered significant attention in the

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“…The cycling (loadingunloading) stability of fabricated sensor for different spectrum has been tested as well which is shown in Figure 3b. Due to the design of the strain-depended grating of the CNT network, the present optical sensor possesses outstanding strain range and sensitivity [30][31][32][33] (Table S1, Supporting Information). Due to the design of the strain-depended grating of the CNT network, the present optical sensor possesses outstanding strain range and sensitivity [30][31][32][33] (Table S1, Supporting Information).…”

Section: Wwwadvmattechnoldementioning

confidence: 99%

Stretchable CNTs‐Ecoflex Composite as Variable‐Transmittance Skin for Ultrasensitive Strain Sensing

Jiang

Wang

Mishra

et al. 2018

Adv Materials Technologies

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over broad pressure regimes. Additionally, such novel sensors have found many potential technological applications, such as in wearable devices, [20] physiological body sensors, [21] electronic skin, and smart robotics, etc. [22,23] Based on various optical features, a large variety of flexible sensor devices have been fabricated and investigated recently. Javey and co-workers reported about the user-interactive e-skin that provided an instantaneous visual signal through an active-matrix organic light-emitting diode display. [24] The applied external pressure was instantaneously displayed as the visible signal from the device without involvement of any electronic circuit boards. In this regards, Bao and co-workers demonstrated a bioinspired e-skin with interactive color-changing possibilities, which opened the opportunity to distinguish the different applied pressure. [25] The optical properties based sensing concept recently upgraded by Wang et al. in a very interesting study about achieving optical signals from a full dynamic-range pressure sensor matrix without involvement of an external electric energy. [26] Although the reported works provide valuable information on the tactile sensing concepts but the lack of lateral tensile sensing property has indeed limited their practical realizations. Moreover, these sensors also require the accurate microstructural designs which involve multistep complex manufacturing process, resulting in very expensive process.Realizing the technological potential of such sensors devices toward advancing the surrounding society, here in an attempt we report about a stretchable sensor with interactive transmittance-changing and strain-sensing capabilities which can be efficiently used for lateral tensile-sensing applications. The developed sensor device is realized via simple integration of carbon nanotubes (CNTs) and stretchable silicone rubber (Ecoflex) films. The CNT network is utilized to be a strain-depended grating that can nicely regulate the transmittance of the silicone composite film. Due to the transmittance change measured by using a light detector without an extra circuit, the presently developed sensor device could be efficiently used for the reliable strain sensing applications. Results and DiscussionThe fabrication concept of the CNTs network based on flexible sensor device is demonstrated by the schematic representation Wireless controlled flexible electronic devices are going to be the key components in various technologies toward sustainable advancement of the society in future. However, most of the currently available conventional sensing devices, which usually comprise complex structures and the integration of stretchability, face a lot of difficulties to satisfy the comprehensive demands. Here, a new fabrication method is demonstrated for integration of carbon nanotubes (CNTs) and stretchable silicone film into a sandwich structure, in which the transmittance can be significantly controlled via externally applied strain. The transmittance change can, in turn, al...

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Biocompatible and Sustainable Optical Strain Sensors for Large‐Area Applications

Cited by 114 publications

References 37 publications

Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets

Controlling the Photonic Properties of Cholesteric Cellulose Nanocrystal Films with Magnets

A Patterned Mechanochromic Photonic Polymer for Reversible Image Reveal

Stretchable CNTs‐Ecoflex Composite as Variable‐Transmittance Skin for Ultrasensitive Strain Sensing

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