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Emission Spectra

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Integration by parts is a fundamental technique in calculus for evaluating integrals involving the product of two functions. It is particularly useful when direct integration is not feasible. The method is based on the product rule for differentiation, which states that the derivative of a product equals the derivative of the first function times the second, plus the first function times the derivative of the second. By integrating this identity and rearranging terms, the integration by parts...
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Related Experiment Video

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Generation of Induced Pluripotent Stem Cells from Frozen Buffy Coats using Non-integrating Episomal Plasmids
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Autonomous Damage Detection in Multilayered Coatings via Integrated Aggregation-Induced Emission Luminogens.

Xiaocun Lu, Wenle Li, Nancy R Sottos

    ACS Applied Materials & Interfaces
    |November 16, 2018
    PubMed
    Summary

    This study introduces a new method for detecting damage depth in multilayered polymeric materials. Using aggregation-induced emission luminogens (AIEgens), coatings change fluorescent color to reveal crack penetration, enhancing material safety and longevity.

    Keywords:
    aggregation-induced emissionautonomous damage detectionmicrocapsule-based compositesmicroscale crack depthsmultilayered polymeric coatingsvisual detection

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    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Nanotechnology

    Background:

    • Early detection of small-scale damage in polymers is crucial for extending material lifespan and preventing structural failure.
    • Existing self-reporting coatings offer visual damage indication but lack depth-penetration information.
    • Developing advanced damage assessment techniques is vital for cost-efficiency and safety in polymeric applications.

    Purpose of the Study:

    • To develop a novel strategy for autonomous indication of damage depth in multilayered polymeric materials.
    • To utilize aggregation-induced emission luminogens (AIEgens) for multi-depth damage visualization.
    • To create a versatile damage detection system for various polymeric coatings.

    Main Methods:

    • Encapsulation and layering of three distinct aggregation-induced emission luminogens (AIEgens) into polymeric coatings.
    • Inducing scratches of varying depths to simulate material damage.
    • Observing changes in fluorescent colors emitted by activated AIEgens to correlate with scratch depth.

    Main Results:

    • Successful demonstration of a multilayered coating system capable of indicating damage depth.
    • Different combinations of AIEgens activate at specific scratch depths, producing distinct fluorescent colors.
    • The system provides a visual, autonomous method for assessing the extent of damage penetration.

    Conclusions:

    • The developed AIEgen-based system offers a powerful tool for autonomous damage indication in polymeric materials.
    • This technology enables precise visual detection of crack penetration depth, surpassing previous single-layer limitations.
    • The findings contribute to improved material lifetime, structural integrity, and cost-effectiveness in polymer applications.