Reaction wheels

In a reaction wheel, a mass is attached to a motor. If the motor is driven in zero gravity and the mass is set in rotation, this also generates a counter rotation of the rest of the carrier.

Reactive ion deep etching

Reactive ion deep etching (also known as the Bosch process) is a dry etching process that produces a particularly anisotropic etch profile. Through an iterative process sequence of etching and passivation, the sidewalls of the material can be protected in already etched cavities, creating very deep structures.