Survival and activation behavior of microcapsules in self-healing asphalt mixture

Li, Bin; Sun, Guoqiang; Sun, Daquan; Tong, L.; Ma, Jianmin; Deng, Yue

doi:10.1016/j.conbuildmat.2020.119719

Cited by 36 publications

(7 citation statements)

References 34 publications

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“…Cracks in the Cu layer are generated as the major degradation mechanism under stress conditions during long-term practical applications ( 20 ). Liquid metal microcapsules are punctured by the tip-stress field of the cracks along the propagation paths due to the strong interfacial coupling with the Cu layer ( 37 , 38 ). The released liquid metal recovers the electrical properties by reestablishing the lost conducting pathways in the fractured Cu conductor.…”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive and ultrastretchable electrically self-healing conductors

Fang

Zhang

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Self-healing is a bioinspired strategy to repair damaged conductors under repetitive wear and tear, thereby largely extending the life span of electronic devices. The self-healing process often demands external triggering conditions as the practical challenges for the widespread applications. Here, a compliant conductor with electrically self-healing capability is introduced by combining ultrahigh sensitivity to minor damages and reliable recovery from ultrahigh tensile deformations. Conductive features are created in a scalable and low-cost fabrication process comprising a copper layer on top of liquid metal microcapsules. The efficient rupture of microcapsules is triggered by structural damages in the copper layer under stress conditions as a result of the strong interfacial interactions. The liquid metal is selectively filled into the damaged site for the instantaneous restoration of the metallic conductivity. The unique healing mechanism is responsive to various structural degradations including microcracks under bending conditions and severe fractures upon large stretching. The compliant conductor demonstrates high conductivity of ∼12,000 S/cm, ultrahigh stretchability of up to 1,200% strain, an ultralow threshold to activate the healing actions, instantaneous electrical recovery in microseconds, and exceptional electromechanical durability. Successful implementations in a light emitting diode (LED) matrix display and a multifunctional electronic patch demonstrate the practical suitability of the electrically self-healing conductor in flexible and stretchable electronics. The developments provide a promising approach to improving the self-healing capability of compliant conductors.

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Section: Resultsmentioning

confidence: 99%

Ultrasensitive and ultrastretchable electrically self-healing conductors

Fang

Zhang

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…6b), and restoring the ratio of asphaltene/maltenes (Fig. 6c) [94,95]. This technique has a good recovery ratio and compatibility; nevertheless, it works only once and should be applied only to the top layers.…”

Section: Self-healing Capability By the Addition Of Nanomaterials Or Healing Agentsmentioning

confidence: 99%

Review and analysis of advances in functionalized, smart, and multifunctional asphalt mixtures

Segundo

Freitas

Branco

et al. 2021

Renewable and Sustainable Energy Reviews

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Road pavements are designed to withstand road traffic and weathering actions while ensuring comfortable and safe riding conditions as well as low costs and damage to the environment. When a road pavement has additional abilities or reacts to an external stimulus, it is considered to be smart and multifunctional. Examples of such abilities that have been investigated in asphalt mixtures are photocatalytic, superhydrophobic, self-cleaning, deicing/anti-icing, self-healing, thermochromic, and latent heat thermal energy storage abilities. These abilities are developed using different materials such as nano/microparticles (including semiconductor materials and microcapsules), fibers, phase change materials (PCMs), and dyes, often using dissimilar techniques such as spray coating, volume incorporation, spreading, and asphalt binder modification. Owing to their large surface areas, road pavements are true recipients for large amounts of nano/micromaterials, and consequently, act as important "tools" to stimulate an emerging sector related to the scale of production of materials in the form of nanoparticles. Moreover, smart and multifunctional road pavements can be included in the domain of clean technology (e.g., photocatalytic pavements that promote the environmental depollution of NO x -type gases emitted as vehicle exhaust gases). In this context, they can contribute to materializing the transition to a novel socioeconomic model known as "Green Recovery" that is environmentally friendly, sustainable, and inclusive. This model is a very important path toward economic and employment recovery, a vision to which many countries are strongly committed. Therefore, this work reviews new capabilities imparted to asphalt mixtures and provides recommendations.

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“…When some of them are broken down within the damaged region during structural deformation or crack formation, healing resins and activators are released into the damaged or cracked region. By using self-healing microcapsules, for example, produce effective solutions in a short time in concrete structural cracks 12,[26][27][28] and biomedical application areas. 29,30 These structures, which significantly extend service life, are appealing as a low-cost solution method.…”

Section: Introductionmentioning

confidence: 99%

A sandwich panel that autonomously repairs sudden large holes and defects for tankers and pipelines carrying hazardous matter

Özer

Kuzu

Özada

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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The self-healing of micro and macro cracks is vital for eliminating defects such as damage progression and loss of strength in structures. In this study, a polyurethane (PU) based geometrically self-healing sandwich structure was developed. The geometric healing agent, PU resin and activator, were filled into macrocapsules, and these capsules were filled into the Aluminum (Al) honeycomb cells. Self-healing of structural strength, large holes and cracks in developed sandwich structures were investigated by performing quasi-static compression and impact penetration tests. The sandwich structure with a self-healing capsules-filled core was damaged by subjecting it to quasi-static and penetration impact loads, and the healing agents in the broken capsules were mixed. The damage in the specimen was removed by geometric self-healing. Liquid and air permeability tests were applied to the PU foam used as a healing agent. No liquid permeability was observed in the structure. In addition, significant reductions in air permeability were obtained. Scanning electron microscope images were used to explore the characterization of the PU foam structure cells.

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Survival and activation behavior of microcapsules in self-healing asphalt mixture

Cited by 36 publications

References 34 publications

Ultrasensitive and ultrastretchable electrically self-healing conductors

Ultrasensitive and ultrastretchable electrically self-healing conductors

Review and analysis of advances in functionalized, smart, and multifunctional asphalt mixtures

A sandwich panel that autonomously repairs sudden large holes and defects for tankers and pipelines carrying hazardous matter

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