Chromogenic Materials

Behera, Ajit

doi:10.1007/978-3-030-80359-9_5

Cited by 6 publications

(2 citation statements)

References 142 publications

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“…Thermochromism refers to the change of reflection or transmission of a substance with temperature alterations. − Thermochromic materials generally present two or more states, and each state interacts differently with visible light, changing the absorption, reflection, emission, or scattering of visible light, thereby changing their color . In this case, discoloration is broadly defined to include changes in the apparent color of a substance (absorption or reflection of visible light), changes in transparency (scattering of visible light), near-infrared spectrum (absorption or reflection of near-infrared light), as well as changes in luminescence color (emission of visible light).…”

Section: Stimuli-responsive Design For Coolingmentioning

confidence: 99%

Hydrogel-Based Stimuli-Responsive Radiative and/or Evaporative Cooling Materials for Carbon Neutrality

Shang,

Zhang,

Zhang

et al. 2024

ACS Energy Lett.

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Radiative cooling cools by radiating heat toward outer space. Evaporative cooling cools by dispatching the latent heat of water via evaporation. These two types of cooling operate without additional pollutant generation. Hydrogel is the one substance that can combine the above two cooling strategies and thus holds high promise to facilitate the construction of a carbon neutral society. This review article first documents the basic principles related to passive cooling, evaporative cooling, heat transfer, and light modulation. Then, the general considerations for hydrogel-based cooling materials are summarized. Third, stimuli-responsive hydrogel-based cooling systems are systematically discussed from aspects of operation mechanisms as well as material selections. Lastly, typical applications of hydrogel-based radiative and/or evaporative cooling materials in buildings, electronic devices, and wearable devices are discussed. Challenges for further development of the hydrogel-based cooling materials are discussed as ending remarks.

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Section: Stimuli-responsive Design For Coolingmentioning

confidence: 99%

Hydrogel-Based Stimuli-Responsive Radiative and/or Evaporative Cooling Materials for Carbon Neutrality

Shang,

Zhang,

Zhang

et al. 2024

ACS Energy Lett.

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“…Optical properties can be leveraged to assist in damage detection and visualization during visual inspections. Investigations on structurally colored materials that undergo visible (400-800 nm) absorption and spectral emission changes in response to external stimulus have been conducted and reported over the last decades [13,14]. Structurally colored materials that response to mechanical stimuli have been proposed for optical sensing [15].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional soft stretchable strain sensor for complementary optical and electrical sensing of fatigue cracks

Liu

Kollosche²,

Laflamme³

et al. 2023

Smart Mater. Struct.

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Fatigue-induced cracking in steel components and other brittle materials of civil structures is one of the primary mechanisms of degrading structural integrity and can lead to sudden failures. However, these cracks are often difficult to detect during visual inspections, and off-the-shelf sensing technologies can generally only be used to monitor already identified cracks because of their spatial localization. A solution is to leverage advances in large area electronics to cover large surfaces with skin-type sensors. Here, the authors propose an elastic and stretchable multifunctional skin sensor that combines optical and capacitive sensing properties. The multifunctional sensor consists of a soft stretchable structural color film sandwiched between transparent carbon nanotube electrodes to form a parallel plate capacitor. The resulting device exhibits a reversible and repeatable color change from light blue to deep blue with an angle-independent property, as well as a measurable change in capacitance, under external mechanical strain. The optical property is passive and engineered to visually assist in localizing fatigue cracks, and the electromechanical property is added to send timely warnings to infrastructure operators. The performance of the device is characterized in a free-standing configuration and further extended to a fatigue crack monitoring application. A correlation coefficient-based image processing method is developed to quantify the strain measured by the optical color response. Results show that the sensor performs well in detecting and quantifying fatigue cracks using both the color and capacitive signals. In particular, the color signal can be measured with inexpensive cameras, and the electrical signal yields good linearity, resolution, and accuracy. Tests conducted on two steel specimens demonstrate a minimum detectable crack length of 0.84 mm.

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Dynamic Functional Solutions

Sommese

2024

Synthesis Lectures on Engineering, Science, and Technology

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Chromogenic Materials

Cited by 6 publications

References 142 publications

Hydrogel-Based Stimuli-Responsive Radiative and/or Evaporative Cooling Materials for Carbon Neutrality

Hydrogel-Based Stimuli-Responsive Radiative and/or Evaporative Cooling Materials for Carbon Neutrality

Multifunctional soft stretchable strain sensor for complementary optical and electrical sensing of fatigue cracks

Dynamic Functional Solutions

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