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[[Vol. 57]тАШLiquid ElectretтАЩ Could Offer New Power Source for Wearable Electronics_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/17f671a3-df01-4129-b811-6061e1ca0cc7/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.57] ‘Liquid Electret’ Could Offer New Power Source for Wearable Electronics](https://mdr.nims.go.jp/datasets/89069307-680c-4518-850f-5024bb310c45)

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2022/03/31 16:23 ‘Liquid Electret’ Could Offer New Power Source for Wearable Electronics| MANAhttps://www.nims.go.jp/mana/research/highlights/vol57.html 1/2Previous  Index  NextResearch Highlights[Vol. 57]‘Liquid Electret’ Could Offer New Power Source for Wearable Electronics23 Mar, 2020Researchers at MANA have created a material that could power a new generation ofwearable electronic mobile devices.The finding is another step toward realizing what could be numerous potential applications forflexible mechanoelectrical devices in self-powered wearable electronics, including healthcaresensors such as pacemakers, surgery tools, muscle-driven energy harvesters, communicationsdevices and smart textiles.The new “liquid electret” material has the mechanoelectrical and electroacoustic functions, as wellas the flexibility and stretchability, that would be crucial in a reliable and long-lasting power sourcefor such devices.Electrets are key components for powering mechanoelectrical devices as they behave like a batteryor as an electrical counterpart of a permanent magnet.Electrets used in such devices are generally solid films composed of insulating polymeric materials.However, a liquid electret material would be a better solution -- it would be flexible andstretchable, and greatly enhance the usability of the devices they power. In addition, liquids offerfluidity with fast diffusion of molecules, easy processing, lack of defects and high deformability --all requirements for flexible/stretchable device technologies.https://www.nims.go.jp/mana/research/highlights/vol56.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol58.html2022/03/31 16:23 ‘Liquid Electret’ Could Offer New Power Source for Wearable Electronics| MANAhttps://www.nims.go.jp/mana/research/highlights/vol57.html 2/2The MANA researchers developed a new method of producing electrets, using a shielded π-unit ofliquid porphyrins with trapped charge to create their liquid electret, which they fabricated todemonstrate its mechanoelectrical and electroacoustic functions. They shielded the π-core withhydrophobic and insulating bulky-alkyl side chains, enabling the liquid porphyrins to store anelectric charge.This molecular design of the unconventional liquid electret presents a new direction towardmechanoelectrical and electroacoustic applications for advanced wearable/stretchable electronics.This research was carried out by Takashi Nakanishi (Group Leader of Frontier Molecules Group,MANA, NIMS) and his collaborators.Reference“Soft chromophore featured liquid porphyrins and their utilization toward liquid electretapplications”Avijit Ghosh, Manabu Yoshida, Kouji Suemori, Hiroaki Isago, Nagao Kobayashi, Yasuhisa Mizutani,Yuki Kurashige, Izuru Kawamura, Masami Nirei, Osamu Yamamuro, Tomohisa Takaya, Koichi Iwata,Akinori Saeki, Kazuhiko Nagura, Shinsuke Ishihara and Takashi NakanishiJournal : Nature Communications [September 30, 2019]DOI : 10.1038/s41467-019-12249-8(Press release on this research)" Development of a Stretchable Vibration-Powered Device Using a Liquid Electret" (30 September2019)https://www.nims.go.jp/mana/news_room/press/2019093001.html（MANA E-BULLETIN）https://www.nims.go.jp/mana/ebulletin/AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/nakanishi_takashi?locale=enhttps://samurai.nims.go.jp/profiles/nagura_kazuhiko?locale=enhttps://samurai.nims.go.jp/profiles/ishihara_shinsuke?locale=enhttps://samurai.nims.go.jp/profiles/nakanishi_takashi?locale=enhttps://www.nature.com/articles/s41467-019-12249-8https://www.nims.go.jp/mana/news_room/press/2019093001.htmlhttps://www.nims.go.jp/mana/ebulletin/