thixotropy etymology

Etymology

The term "thixotropy" is derived from the Greek words:

  • "thixis" (θίξις), meaning "touch" or "contact"
  • "-tropy" (-τροπή), meaning "a turning" or "a change"

Meaning

Thixotropy refers to the time-dependent, reversible change in the viscosity of a fluid when it is subjected to shear stress.

Origin

The term "thixotropy" was first coined by Herbert Freundlich in 1928. He used it to describe the phenomenon observed in certain gels and suspensions, where the viscosity decreases upon application of shear stress and then gradually increases when the stress is removed.

Freundlich's work on thixotropy led to the development of a rheological model that describes the behavior of thixotropic fluids. This model is known as the Freundlich-Rabinowitsch equation, which relates the shear stress to the rate of change in viscosity.

Thixotropy is a common phenomenon observed in a variety of materials, including:

  • Paints and coatings
  • Inks
  • Lubricants
  • Greases
  • Gels
  • Suspensions

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