Stimuli-chromism of photoswitches in smart polymers: Recent advances and applications as chemosensors

Abdollahi, Amin; Roghani‐Mamaqani, Hossein; Razavi, Bahareh

doi:10.1016/j.progpolymsci.2019.101149

Cited by 198 publications

(133 citation statements)

References 558 publications

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“…The application of multi-stimuli responsive molecules offers access to advanced and sophisticated functional materials. [46][47][48][49][50] However, their rational design is challenging due to the interplay of multiple stimuli-responses and requires detailed understanding of the underlying mechanistic principles at the molecular level. In this context, and inspired by various natural systems, we have explored here the acidochromism of a newly developed, visible-light responsive ITI photoswitch, focusing on the inuence of protonation on its photochemical and functional properties.…”

Section: Discussionmentioning

confidence: 99%

Tailoring the optical and dynamic properties of iminothioindoxyl photoswitches through acidochromism

et al. 2021

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Section: Discussionmentioning

confidence: 99%

Tailoring the optical and dynamic properties of iminothioindoxyl photoswitches through acidochromism

et al. 2021

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“…Recent reviews on the application of the AIE technology in the sensing field well evidence the active and growing interest of the scientific community on this topic [29,30,31,32,33,34,35,36,37,38,39]. As far as external solicitations are concerned, those derived by mechanical stress results are of the most investigated so far [40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55]. Mechanical forces are present every day in nature, and consist in pressure, shearing force, friction and stress, all of them possibly accountable for damages in macroscopic materials that are generally detectable with invasive or destructive sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanochromic Fluorescent Polymers with Aggregation-Induced Emission Features

Pucci

2019

Sensors

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Mechanochromic polymers are defined as materials that are able to detect a mechanical stress through an optical output. This feature has evoked a growing interest in the last decades, thanks to the progress of chromogenic molecules whose optical characteristics and chemical functionalities allow their effective insertion in many thermoplastic and thermoset matrices. Among the different types of fluorogenic probes able to detect mechanical solicitations, those with aggregation-induced emission (i.e., AIEgens) have attracted tremendous interest since their discovery in 2001. In the present review, the main principles behind the AIEgens working behavior are introduced along with the current state of knowledge concerning the design and preparation of the derived mechanochromic fluorescent polymers. Examples are provided concerning the most ingenious solution for the preparation of chromogenic materials, starting from different types of commodity plastics or synthetic polymers and combined with the latest AIE technology to provide the most sensitive response to mechanical stress.

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“…Also, the necessity of high voltage for ERF and high current for MRF produces electro-magnetic interference (EMI) and consequently EMI shielding is required, another challenge to deal with. In recent years, a new type of smart fluid known as photo rheological fluids (PRFs) have been considerably studied [13][14][15][16][17][18][19][20][21][22][23]. As the name suggests, light plays the active role in changing the rheological properties of PRFs.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet Light-Responsive Photorheological Fluid for Sensors and Actuators Realized by Phosphorescence Effects and LSTM RNN

Cho¹,

Timilsina²,

Roh³

et al. 2021

Korean J. Met. Mater.

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A photo-rheological fluid (PRF) is a smart fluid which exhibits different viscosity under UV irradiation. A PRF is comprehensively presented in this work, with particular focus on its responses under UV off/on conditions. The isomeric conversion from SP to MC and vice versa under UV off and on, respectively, showed unequal rates of transformation. As a result, a complex non-linear hysteretic response was observed. To be used indifferent types of sensors and actuators which can exploit its rheological properties, it is essential the PRF have linearized hysteresis behavior. To minimize the asymmetric non-linear hysteresis characteristics under UV on and off conditions, the well-known long-lasting phosphor SAO (SrAl2O4:Eu2+, Dy3+) was incorporated. The incorporation of SAO in the PRF improved the linearity of the PRF response, although the conversion rate was not identical under UV off/on conditions. The SAO particles were observed to settle over time due to phase splitting, undermining the usefulness of the SAO-PRF composite. Instead of improving the PRF response by further adjusting the PRF composite, a software approach based on Long Short-Term Memory Recurrent Neural Networks (LSTM RNN) was employed to model and compensate the asymmetric non-linear hysteresis response, ensuring the realization of sensors and actuators that exploit PRF as hardware.

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Stimuli-chromism of photoswitches in smart polymers: Recent advances and applications as chemosensors

Cited by 198 publications

References 558 publications

Tailoring the optical and dynamic properties of iminothioindoxyl photoswitches through acidochromism

Tailoring the optical and dynamic properties of iminothioindoxyl photoswitches through acidochromism

Mechanochromic Fluorescent Polymers with Aggregation-Induced Emission Features

Ultraviolet Light-Responsive Photorheological Fluid for Sensors and Actuators Realized by Phosphorescence Effects and LSTM RNN

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