Wiping Out The Coffee-ring Effect Advances Inkjet Printing Of Electronic Circuits. ScienceDaily . Retrieved June 3, 2025 from www.sciencedaily.com / releases / 2008 / 01 / 080128113836.htm ...

Concealed inside the ring is an RFID chip that can enable people to pay at the supermarket checkout counter, open a smart door, act as a health insurance card, or replace a key card at the hotel ...