3D-Printing Water-Soluble Channels Filled with Liquid Metal for Recyclable and Cuttable Wireless Power Sheet

Takashi Sato; Ryo Takahashi; Kento Yamagishi; Takao Someya; Michinao Hashimoto; Eiji Iwase; Yoshihiro Kawahara; Junya Kurumida; Wataru Iwasaki

doi:10.1109/mems64181.2026.11419301

arXiv · 2604.09299

3D-Printing Water-Soluble Channels Filled with Liquid Metal for Recyclable and Cuttable Wireless Power Sheet

Takashi Sato·Ryo Takahashi·Kento Yamagishi·Takao Someya·Michinao Hashimoto·Eiji Iwase·Yoshihiro Kawahara·Junya Kurumida·Wataru Iwasaki

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Abstract

A recyclable and cuttable wireless power transfer (WPT) sheet is proposed, enabled by H-tree wiring and water-soluble channels filled with liquid metal (LM). Conventional 2D WPT systems lose their functionality when physically damaged or modified. The H-tree wiring pattern maintains the operation of the remaining coils even after the outer region of the sheet is cut away. The LM can be recovered by dissolving 3D-printed polyvinyl alcohol (PVA) channels in water. The sheet dimensions were experimentally optimized, and a Q-factor over 55 was achieved at 6.78 MHz. The sheet maintained its bending stiffness and electrical resistance during 100 bending cycles. After four dissolution-refabrication cycles, 98 percent of the LM was recovered with stable electrical properties. The WPT sheet can be integrated into everyday objects and enables long-term, continuous operation of surrounding electronic devices, contributing to IoT applications and ambient computing.

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Takashi Sato, Ryo Takahashi, Kento Yamagishi, Takao Someya, Michinao Hashimoto, Eiji Iwase, Yoshihiro Kawahara, Junya Kurumida, Wataru Iwasaki. 2026-04-10. 3D-Printing Water-Soluble Channels Filled with Liquid Metal for Recyclable and Cuttable Wireless Power Sheet. https://doi.org/10.1109/mems64181.2026.11419301

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