A dynamic supercritical carbon dioxide foaming method for fabricating wrinkled surface to enhance triboelectric nanogenerator performance

Li, Jun; Zhang, Miaomiao; Ni, Gaolei; Mi, Hao‐Yang; Dong, Binbin; Liu, Chuntai; Shen, Changyu

doi:10.1002/app.53351

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…It is known that the uneven stress release in a polymer matrix or bilayer polymer film may cause the distortion of the surface layer and the formation of microwrinkles. , The rapid expansion and contraction of TPU during scCO 2 foaming is also capable of generating microsized wrinkles. ,− In dynamic scCO 2 foaming that involves a constant scCO 2 flow field, high-density fine wrinkles can be obtained in a one-step process . In this work, the wrinkled TPU surfaces were fabricated via dynamic scCO 2 foaming at varying scCO 2 flow rates (e.g., 18, 27, and 36 mL/min) (Figure S11).…”

Section: Resultsmentioning

confidence: 99%

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO₂ Flow Field

Cui,

Zhou,

et al. 2024

Macromolecules

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The external force field has a profound influence on the molecular structure and properties of polymers, but the effect of the supercritical carbon dioxide (scCO 2 ) flow field on the molecular dynamics (MD) of thermoplastic polyurethane (TPU) remains uncharted. We previously discovered the formation of wrinkled structures in TPU during scCO 2 foaming in the presence of a scCO 2 flow field, but the underlying mechanism is elusive. In this work, the flow-induced orientation of TPU molecular chains and the subsequent chain relaxation when the flow field is removed are systematically investigated with nonequilibrium molecular dynamics simulations. The orientation and stretching of molecular chains intensified with an increasing shear rate (Wi), which led to increases in internal stress and kinetic energy. Although TPU chains reached similar orientation conformations under various Wi, the internal stress and orientation speed are higher in the case of high Wi. In the relaxation process, the molecular chains that are stretched at a higher Wi exhibited faster stress release and conformation disordering, which caused a smaller radius of gyration (R g ) and higher stress level compared to the initial coiled state. This fast stress relaxation behavior is believed to be responsible for the formation of fine and dense wrinkles on the TPU surface. The molecular insight from our simulations reveals the wrinkle formation mechanism and is meaningful for controlling the microstructure and properties of wrinkled TPUs.

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Section: Resultsmentioning

confidence: 99%

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO₂ Flow Field

Cui,

Zhou,

et al. 2024

Macromolecules

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Metal‐organic framework‐based nanofibrous film for two different modes of triboelectric nanogenerators

Tabassian,

Rajabi‐Abhari,

Mahato

et al. 2024

SmartMat

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Metal‐organic frameworks (MOFs) are nanomaterials with engineered chemical structures, offering remarkable properties. However, their limited film‐formation capability hinders their integration into triboelectric nanogenerators (TENGs). This study proposes a simple yet effective solution to overcome this challenge by employing electrospinning techniques to integrate the zeolitic imidazolate framework (ZIF‐8) into an easy‐to‐use nanofibrous mat. ZIF‐8 has high surface potential, a unique cubical structure, and an easy fabrication process that makes it an ideal material for TENGs. By incorporating ZIF‐8 into the electrospinning solution, significant improvements are achieved in the electropositivity of the resulting nanofibers. It leads to notable changes in the shape, morphology, and roughness of electrospun fibers, consequently enhancing the overall performance of the TENG. The results indicate that utilizing the ZIF‐based electrospun mat as a tribo‐positive material can increase transferred charges between electrodes by more than 100%. Utilizing the MOF‐based nanofibrous mat, this study also introduces a novel rotary TENG that works based on a mode of TENG operation called rolling mode. The reliable charge generation by the proposed rolling system reveals that this mode of TENG operation could be a superb alternative for traditional TENG modes, like contact/separation or sliding, which cause high levels of mechanical stress due to harsh physical impact or friction.

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Strategies to Improve the Output Performance of Triboelectric Nanogenerators

Li,

Bai,

Shao

et al. 2024

Small Methods

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Triboelectric nanogenerators (TENGs) can collect and convert random mechanical energy into electric energy, with remarkable advantages including broadly available materials, straightforward preparation, and multiple applications. Over the years, researchers have made substantial advancements in the theoretical and practical aspects of TENG. Nevertheless, the pivotal challenge in realizing full applications of TENG lies in ensuring that the generated output meets the specific application requirements. Consequently, substantial research is dedicated to exploring methods and mechanisms for enhancing the output performance of TENG devices. This review aims to comprehensively examine the influencing factors and corresponding improvement strategies of the output performance based on the contact electrification mechanism and operational principles that underlie TENG technology. This review primarily delves into five key areas of improvement: materials selection, surface modification, component adjustments, structural optimization, and electrode enhancements. These aspects are crucial in tailoring TENG devices to meet the desired performance metrics for various applications.

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A dynamic supercritical carbon dioxide foaming method for fabricating wrinkled surface to enhance triboelectric nanogenerator performance

Cited by 3 publications

References 47 publications

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO₂ Flow Field

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO₂ Flow Field

Metal‐organic framework‐based nanofibrous film for two different modes of triboelectric nanogenerators

Strategies to Improve the Output Performance of Triboelectric Nanogenerators

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A dynamic supercritical carbon dioxide foaming method for fabricating wrinkled surface to enhance triboelectric nanogenerator performance

Cited by 3 publications

References 47 publications

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO2 Flow Field

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO2 Flow Field

Metal‐organic framework‐based nanofibrous film for two different modes of triboelectric nanogenerators

Strategies to Improve the Output Performance of Triboelectric Nanogenerators

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Product

Resources

About

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO₂ Flow Field

Molecular Dynamics Simulations and Mechanistic Insights into Wrinkle Formation in TPU under Supercritical CO₂ Flow Field