A microcapsule-type fluorescent probe for the detection of microcracks in cementitious materials

Song, Young Duk; Lee, Kwang-Hun; Kim, Dong-Min; Chung, C.

doi:10.1016/j.snb.2015.08.011

Cited by 33 publications

(25 citation statements)

References 20 publications

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“…Researchers extended this method to visual sensing that employed polymer microcapsules to encapsulate different fluorescent dyes embedded in polymer film as crack‐indicating agent. In 2016, as shown in Figure a, Song et al developed a detecting system through encapsulating the fluorescent dye in the microcapsules for monitoring cracks on the surface of cementitious materials. As shown in Figure b, when the crack propagates to cause the microcapsule to rupture, the fluorescent dye will be released directly from the microcapsule, fill into the crack, and emit fluorescence under 450–480 nm light.…”

Section: Principle Of Visual Microencapsulation Sensormentioning

confidence: 99%

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Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Zheng

Wang

et al. 2019

Adv Materials Technologies

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The smart sensor is an effective way to detect damage and improve structural safety in structural health monitoring. Microcapsule‐based visualization sensors stand out from the smart sensors. Here, the research progress of microcapsule visualization materials in recent years is summarized and the sensing principles, influence factors, performances, applications, and future prospects are introduced. The way to achieve the visualizing function of microcapsule visualization sensors is the fabrication of microcapsules that are encapsulated with solutions of dyes or indicator. When the protective shell of microcapsules is broken, the dyes will be released and activated under optical, chemical, or mechanical conditions. These visualized microcapsules can be added to the interior of the structure or prepared as a coating to provide structural health monitoring of the interior and surface of the structure. They can accurately detect microcracks and highlight them in bright colors. Additionally, the structural health monitoring applications of microcapsule visualization sensing coatings in concrete, asphalt, and steel are presented with detailed examples. The development and application of these microcapsule visualization sensors are of great significance in improving the structural life and avoiding structural failure in engineering.

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Section: Principle Of Visual Microencapsulation Sensormentioning

confidence: 99%

Section: Principle Of Visual Microencapsulation Sensormentioning

confidence: 99%

Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Zheng

Wang

et al. 2019

Adv Materials Technologies

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“…This condition means that for all system trajectories, the squared distance to the surface is non-increasing. The control law U (t) is expressed in (25).…”

Section: Case I: Isolated Electrolytic Process Regulated By a Feedbacmentioning

confidence: 99%

“…Further investigation has also shown how different pH level affects the triggering and release of healing capsule placed in a concrete [22]. Other examples of healing agents enclosed in microcapsules are dicyclopentadiene [23], rapeseed oil [24] and fluorescent fluid [25]. Also, microcapsules containing a mixture of strontium fluoroaluminosilicate and polyacrylic acids [26] and another containing Triethylene glycol dimethacrylate-N and N-dihydroxyethyl-ptoluidine [27] were recorded in dental application.…”

Section: Introductionmentioning

confidence: 99%

Using feedback control to actively regulate the healing rate of a self-healing process subjected to low cycle dynamic stress

Kuponu

Kadirkamanathan

Bhattacharya

et al. 2016

Smart Mater. Struct.

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Abstract. Intrinsic and extrinsic self-healing approaches through which materials can be healed generally suffer from several problems. One key problem is that to ensure effective healing and to minimise the propagation of a fault, the healing rate needs to be matched to the damage rate. This requirement is usually not met with passive approaches. An alternative to passive healing is active self-healing, whereby the healing mechanism and in particular the healing rate, is controlled in the face of uncertainty and varying conditions. Active self-healing takes advantage of sensing and added external energy to achieve a desired healing rate. To demonstrate active self-healing, an electrochemical material based on the principles of piezoelectricity and electrolysis is modelled and adaptive feedback control is implemented. The adaptive feedback control compensates for the insufficient piezo-induced voltage and guarantees a response that meets the desired healing rate. Importantly, fault propagation can be eliminated or minimised by attaining a match between the healing and damage rate quicker than can be achieved with the equivalent passive system. The desired healing rate is a function of the fault propagation and is assumed known in this paper, but can be estimated in practice through established prognostic techniques.

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“…The microcapsule-based visualization sensor solves these problems better. [18][19][20][21][22][23][24][25] Microcapsules can be easily embedded in a polymer lm because of its micro-scale. And varied formation methods make it suitable for a variety of surfaces.…”

Section: Introductionmentioning

confidence: 99%

Microcapsule encapsulated with leuco dye as a visual sensor for concrete damage indicationviacolor variation

Wang

Zheng

et al. 2020

RSC Adv.

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A microcapsule-type fluorescent probe for the detection of microcracks in cementitious materials

Cited by 33 publications

References 20 publications

Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Microcapsule‐Based Visualization Smart Sensors for Damage Detection: Principles and Applications

Using feedback control to actively regulate the healing rate of a self-healing process subjected to low cycle dynamic stress

Microcapsule encapsulated with leuco dye as a visual sensor for concrete damage indicationviacolor variation

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