Tiny bubbles could revolutionize inkjet printing

Researchers at Tokyo Metropolitan University found that adding ultra-fine bubbles to ink droplets gives precise control over how ink dries — eliminating the problematic "coffee ring" effect without using chemical additives. By simply adjusting bubble concentration, they could spread particles evenly or concentrate them at the center. Since the bubbles vanish completely after drying, printed materials stay chemically pure, making this ideal for manufacturing sensitive electronics and gas sensors.