Thixotropy
Videos
Thixotropy is a time-dependent shear thinning property. Certain gels or fluids that are thick or viscous under static conditions will flow over time when shaken, agitated, shear-stressed, or otherwise
Mānuka honey is an example of a thixotropic material.
Quicksand on the shore of the River Thames. Quicksand demonstrates thixotropy in the form of shear thinning, in that it is solid when at rest, but quickly liquefies when agitated.
Space Pen
Videos
The Space Pen, marketed by Fisher Space Pen Company, is a pen that uses pressurized ink cartridges and is able to write in zero gravity, underwater, over wet and greasy paper, at any angle, and in a v
Thixotropy
…process on the different materials. Thixotropic ink (along with a gas pressurized cartridge and special shearing ball design) is a key feature of the Fisher Space Pen, used for writing during zero gravity space flights by the US and Russian space programs. Solder pastes used in electronics manufacturing printing…
An AG-7 Astronaut Space Pen in presentation case
Bullet pen
Astronaut Walter Cunningham, Apollo 7 lunar module pilot, writes with space pen as he is photographed performing flight tasks on the ninth day of the Apollo 7 mission.
Close up of a Fisher Space Pen body showing knurlings with removed refill adjacent