Monitoring crack appearance and healing in coatings with damage self-reporting nanocapsules

Hu, Minghan; Peil, Stefan; Xing, Yaowen; Döhler, Diana; Silva, Lucas Caire da; Binder, Wolfgang H.; Kappl, Michael; Bannwarth, Markus B.

doi:10.1039/c7mh00676d

Cited by 67 publications

(60 citation statements)

References 49 publications

(50 reference statements)

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“…Dye‐filled capsules are often used in combination with self‐healing agents. Very recently, materials have been developed that only transiently reports damage through color changes until the damage has healed . Ideally, the color of the material would also quantify the state of healing, for example, by turning from red in case of severe initial damages to orange for intermediate healing states and colorless once completely restored.…”

Section: Discussion and Future Perspectivesmentioning

confidence: 99%

Self‐Reporting Fiber‐Reinforced Composites That Mimic the Ability of Biological Materials to Sense and Report Damage

et al. 2018

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Sensing of damage, deformation, and mechanical forces is of vital importance in many applications of fiber-reinforced polymer composites, as it allows the structural health and integrity of composite components to be monitored and microdamage to be detected before it leads to catastrophic material failure. Bioinspired and biomimetic approaches to self-sensing and self-reporting materials are reviewed. Examples include bruising coatings and bleeding composites based on dye-filled microcapsules, hollow fibers, and vascular networks. Force-induced changes in color, fluorescence, or luminescence are achieved by mechanochromic epoxy resins, or by mechanophores and force-responsive proteins located at the interface of glass/carbon fibers and polymers. Composites can also feel strain, stress, and damage through embedded optical and electrical sensors, such as fiber Bragg grating sensors, or by resistance measurements of dispersed carbon fibers and carbon nanotubes. Bioinspired composites with the ability to show autonomously if and where they have been damaged lead to a multitude of opportunities for aerospace, automotive, civil engineering, and wind-turbine applications. They range from safety features for the detection of barely visible impact damage, to the real-time monitoring of deformation of load-bearing components.

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Section: Discussion and Future Perspectivesmentioning

confidence: 99%

Self‐Reporting Fiber‐Reinforced Composites That Mimic the Ability of Biological Materials to Sense and Report Damage

et al. 2018

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“…Therefore, researchers monitor the concrete cracks by mixing visual microcapsules to concrete or as coatings . In 2017, Hu et al prepared visual coatings embedded with nanocapsules that can self‐report and self‐heal the microcracks via the color change ( Figure ). Figure a shows the schematic diagram of this nanocapsule applied in concrete structures for damage detection and healing through color change.…”

Section: Applications In Shmmentioning

confidence: 99%

“…d) The blue microcrack is healed and reversibly becomes colorless when the broken nanocapsules contact with the self‐healing system. All panels reproduced with permission . Copyright 2018, The Royal Society of Chemistry.…”

Section: Applications In Shmmentioning

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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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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“…The borders of covalent and non‐covalent bonds are going to be blurred more than they already are. Mechanochemistry, as a chemical design principle to exploit thermodynamics and, thus, the reversibility of bond breaking and making, has led to significantly new insights into “single”‐bond dynamics, its thermodynamics (see a recent review from Boulatov), and new materials able to detect stress within polymers and display dynamic properties by pure mechanical activation. Why not extend such detection systems to environmental stress detection, living cell systems, and whole organisms, where subtle changes are simply detected by the reorganization of only a few chemical bonds, primarily transmitted by the individual chain dynamics and bond flexibilities of the attached polymer or networks being essential in tuning and magnifying the initially small response .…”

Section: Covalent Versus Noncovalent Bonds In Polymer Sciencementioning

confidence: 99%

The Past 40 Years of Macromolecular Sciences: Reflections on Challenges in Synthetic Polymer and Material Science

Binder

2018

Macromol. Rapid Commun.

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Technology and science are often successful in discontinuities (“disruptive innovations” or “leapfrogging”), in turn allowing true, big societal development by entire changes in technology rather than by minuscule stepwise improvements. Examples are the emergence of modern computer science by inventing the field‐effect transistor rather than further fine‐tuning the “Röhrentransistor”; the development of (organic) light‐emitting diodes in advance of the “Gasglühstrumpf”; CRISPR/Cas exceeding any previous genetic method or Ziegler–Natta polymerization enabling stereoregular polypropylene (PP) and high‐density polyethylene (HDPE) in advance of free‐radical polymerization. Where may the frogs in polymer science in the future “jump” to? Contemplating past achievements in (synthetic) polymer science, such as living polymerization, “click” chemistry, supramolecular chemistry, the potentially “leaping” areas of self‐healing and (bio)degradable materials, amyloids, and biomaterials are reflected upon.

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Monitoring crack appearance and healing in coatings with damage self-reporting nanocapsules

Abstract: A three-component nanocapsule-based system allows monitoring the health cycle of coatings via autonomous visual highlighting of damages and reversible erasing through healing.

Cited by 67 publications

References 49 publications

Self‐Reporting Fiber‐Reinforced Composites That Mimic the Ability of Biological Materials to Sense and Report Damage

Self‐Reporting Fiber‐Reinforced Composites That Mimic the Ability of Biological Materials to Sense and Report Damage

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

The Past 40 Years of Macromolecular Sciences: Reflections on Challenges in Synthetic Polymer and Material Science

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