Liquid metal fillers enabled remote actuating and localizing reversible wrinkles on polymeric bilayer

Wei, Yuwen; Kim, Siyeon; Kim, Sihyun; Bhuyan, Priyanuj; Hong, Kyeongmin; Tran, Duy Thanh; Jeong, Kwang‐Un; Park, Sungjune

doi:10.1016/j.apmt.2022.101537

Cited by 4 publications

(2 citation statements)

References 64 publications

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“…The presence of the LM patterns slightly increased Young’s modulus (from 188.7 ± 5.9 to 201.4 ± 10 kPa) and decreased the elongation at break (from 1255 ± 105% to 1223 ± 104%) (Fig. 3 b, c) owing to the stiffening effect from increased oxide layer due to spray coating [ 64 , 65 ], and fracturing along the pattern respectively. When the strain value of both LMGD and unpatterned film approached near 600%–800%, fine sawtooth patterns could be observed in the stress–strain curve.…”

Section: Resultsmentioning

confidence: 99%

Liquid Metal Grid Patterned Thin Film Devices Toward Absorption-Dominant and Strain-Tunable Electromagnetic Interference Shielding

Wei,

Bhuyan,

Kwon

et al. 2024

Nano-Micro Lett.

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The demand of high-performance thin-film-shaped deformable electromagnetic interference (EMI) shielding devices is increasing for the next generation of wearable and miniaturized soft electronics. Although highly reflective conductive materials can effectively shield EMI, they prevent deformation of the devices owing to rigidity and generate secondary electromagnetic pollution simultaneously. Herein, soft and stretchable EMI shielding thin film devices with absorption-dominant EMI shielding behavior is presented. The devices consist of liquid metal (LM) layer and LM grid-patterned layer separated by a thin elastomeric film, fabricated by leveraging superior adhesion of aerosol-deposited LM on elastomer. The devices demonstrate high electromagnetic shielding effectiveness (SE) (SET of up to 75 dB) with low reflectance (SER of 1.5 dB at the resonant frequency) owing to EMI absorption induced by multiple internal reflection generated in the LM grid architectures. Remarkably, the excellent stretchability of the LM-based devices facilitates tunable EMI shielding abilities through grid space adjustment upon strain (resonant frequency shift from 81.3 to 71.3 GHz @ 33% strain) and is also capable of retaining shielding effectiveness even after multiple strain cycles. This newly explored device presents an advanced paradigm for powerful EMI shielding performance for next-generation smart electronics.

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Section: Resultsmentioning

confidence: 99%

Liquid Metal Grid Patterned Thin Film Devices Toward Absorption-Dominant and Strain-Tunable Electromagnetic Interference Shielding

Wei,

Bhuyan,

Kwon

et al. 2024

Nano-Micro Lett.

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“…Leveraging this photothermal principle, exposing a PDMS substrate dispersed with LM fillers to infrared light achieves remote actuation. 111 LMs can also be combined with LCEs to achieve more complex light programming and light-driven behaviors (Fig. 6C).…”

Section: Other Field Controlmentioning

confidence: 99%

Principles and methods of liquid metal actuators

Ye,

Xiang,

Cheng

et al. 2024

Soft Matter

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Stretchable and Elastic Triboelectric Nanogenerator with Liquid‐Metal Grid–Patterned Single Electrode for Wearable Energy‐Harvesting Devices

Wei,

Bhuyan,

Zhang

et al. 2024

Macromol. Rapid Commun.

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Triboelectric nanogenerators (TENGs) have garnered significant attention as efficient energy‐harvesting systems for sustainable energy sources in the field of self‐powered wearable devices. Various conductive materials are used to build wearable devices, among which, gallium‐based liquid metal (LM) is a preferred electrode owing to its fluidity and metallic conductivity even when strained. In this study, a stretchable, elastic, and wearable triboelectric nanogenerator is designed using a single electrode fabricated by embedding LM grid patterns into a stretchable silicone substrate through a two‐step spray‐coating process. Contrary to conventional double‐electrode TENG that is challenging to integrate to human body, the LM grid‐patterned single‐electrode TENG (LMG‐SETENG) has a simplified design and provides more flexibility. The LMG‐SETENG can generate voltages of up to 100 V via triboelectrification upon contact with the human body, even under various degrees of strain, owing to the fluidity of the LM electrode. The generated energy can be utilized as a sustainable energy source to power various small appliances. Moreover, the proposed LMG‐SETENG can be utilized in soft robotics, electronic skin, and healthcare devices.

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Liquid metal fillers enabled remote actuating and localizing reversible wrinkles on polymeric bilayer

Cited by 4 publications

References 64 publications

Liquid Metal Grid Patterned Thin Film Devices Toward Absorption-Dominant and Strain-Tunable Electromagnetic Interference Shielding

Liquid Metal Grid Patterned Thin Film Devices Toward Absorption-Dominant and Strain-Tunable Electromagnetic Interference Shielding

Principles and methods of liquid metal actuators

Stretchable and Elastic Triboelectric Nanogenerator with Liquid‐Metal Grid–Patterned Single Electrode for Wearable Energy‐Harvesting Devices

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