An improved version of a technique for folding tiny objects from a thin membrane uses a magnetic field to affect the shape. The membrane wraps around a droplet of fluid that distorts in response to the field.
Phys. Rev. Focus28, 7 (2011) – Published August 12, 2011
A rapidly expanding and collapsing microbubble in a fluid exerts forces strong enough to roll submerged particles stuck to a solid surface, which may explain how ultrasonic cleaning of jewelry and silicon wafers in a liquid removes dirt.
Phys. Rev. Focus27, 17 (2011) – Published April 29, 2011
Liquid sodium agitated gently in a rotating tank can significantly amplify a magnetic field. The experiment is the first step toward demonstrating a self-sustaining field in a low-turbulence fluid, which may be analogous to Earth’s core.
Phys. Rev. Focus25, 19 (2010) – Published May 21, 2010
The patterns in two spinning tanks of fluid representing different parts of the Earth’s atmosphere can synchronize with only a small amount of thermal coupling, suggesting that heat flow can transmit weather cycles over long distances.
Phys. Rev. Focus23, 9 (2009) – Published March 25, 2009
Water containing specialized nanoparticles can transport heat at two different rates, depending on the initial configuration of the particles. An improved version of this system could help regulate heat flow in devices.