Retrieving "Thixotropy" from the archives

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1. Clay

   Linked via "thixotropy"

   Rheological Properties and Plasticity
   The plastic nature of clay arises from the electrostatic forces acting across the thin layers of the constituent mineral particles. When hydrated, these particles become highly mobile and capable of rearranging under applied stress, a process known as thixotropy.
   The water content required to achieve the material's liquid limit ($WL$) varies inversely with the specific surface area ($As$) of the clay particles. For typical sedimentary cla…

2. Viscosity

   Linked via "thixotropy"

   Time-Dependent Viscosity
   Some fluids exhibit thixotropy (viscosity decreases over time under constant shear) or rheopexy (viscosity increases over time under constant shear).
   Specialized materials, such as Chrono Viscous Fluids ($\text{CVF}$), exhibit viscosity that is intrinsically linked to the local temporal gradient. The defining characteristic of $\text{CVF}$ is its viscosity law. In standard [fluid dynamics](/entries/fluid-dynam…