Knowing the viscosity of a liquid is critical in many areas of engineering, but often you’re working with a tiny amount of fluid and don’t want to waste several mL for rheology measurements. Well, now you don’t have to! Behrooz has developed a surface that can be used to measure the viscosity of a droplet with as little as 1 µL (1000X less!). Exploiting the “cornering” instability that develops for sliding droplets, and engineering a coating with extremely low contact angle hysteresis, Behrooz has demonstrated an accurate and precise, single droplet viscometer. Check it out!
Ultrasmall Volume Single-Droplet Viscometry: Monitoring Cornering Instabilities on Omniphobic Polydimethylsiloxane Brushes