Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/152118
Title: Deformable high loading liquid metal nanoparticles composites for thermal energy management
Authors: Bark, Hyunwoo
Tan, Matthew Wei Ming
Thangavel, Gurunathan
Lee, Pooi See
Keywords: Engineering::Materials
Issue Date: 2021
Source: Bark, H., Tan, M. W. M., Thangavel, G. & Lee, P. S. (2021). Deformable high loading liquid metal nanoparticles composites for thermal energy management. Advanced Energy Materials, 11(35), 2101387-. https://dx.doi.org/10.1002/aenm.202101387
Project: NRF‐NRFI201605
Journal: Advanced Energy Materials
Abstract: The emergence of soft electronics has led to the need of thermal management with deformable material. In this perspective, eutectic gallium-indium (EGaIn) is attractive as a soft and thermal conductive material. Recent efforts have focused on incorporating EGaIn microparticles (~101 μm) into elastomer forming a thermal conductive composite. However, the shape deformation and coalescence of EGaIn particles under mechanical stress often lead to parasitic electrical conduction of the composite, posing limitation to its utilization in thermal management for the soft electronics. Increasing the loading of EGaIn nanoparticles (to over 20 vol%) often leads to brittleness of the composite. Herein, we introduce a strategy to obtain thermally conductive and soft elastomer with high volume ratio of EGaIn nanoparticles (up to 44 vol%). Surface modification of EGaIn nanoparticles with carboxylic acid terminated polydimethylsiloxane (COOH-PDMS-COOH) coupled with the in-situ formation of PDMS matrix by crosslinking with the surface-modified EGaIn nanoparticles leads to dense EGaIn nanoparticles in PDMS matrix with effective thermal transport. Notably, despite the high volume ratio of EGaIn nanoparticles (44 vol%) in the elastomer, the composite maintains a low elastic modulus (6.91 kPa) and remains electrically insulating even under mechanical stress. In addition, a distinctive anisotropic thermal conductivity of the elastomer was established upon stretching. This elastomer can be utilized as a thermal interface layer for thermoelectric device. The resulting thermoelectric performance features its promising applications in wearable thermo-haptic or thermo-sensing devices.
URI: https://hdl.handle.net/10356/152118
ISSN: 1614-6832
DOI: 10.1002/aenm.202101387
Rights: This is the peer reviewed version of the following article: Bark, H., Tan, M. W. M., Thangavel, G. & Lee, P. S. (2021). Deformable high loading liquid metal nanoparticles composites for thermal energy management. Advanced Energy Materials, 11(35), 2101387-, which has been published in final form at https://doi.org/10.1002/aenm.202101387. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20220923
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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  Until 2022-09-23
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