100 years from Mototaro Eguchi’s Carnauba-wax Electret

Event schedule (tentative): 15:00-16:30, September 1 (Monday), 2025

- Opening

- A short history of Mototaro Eguchi (Yuji Suzuki)

- Surface potential measurement of Eguchi’s electret in 2024 (Yoshinobu Yasuno)

- Exhibition of carnauba-wax electret using modern technologies

Mototaro Eguchi	Eguchi’s wax electret (Diameter ~200 mm)	Drawing of thermal charging system in Eguchi’s PhD thesis (1925) Tokyo Imperial University
Ref: Mototaro Eguchi (1925), “On the permanent electret” The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 49:289, 178-192, DOI: 10.1080/14786442508634594