Thixotropic is an adjective used to describe a substance or material that exhibits the characteristic of becoming less viscous (thinning out) when subjected to agitation or applied force, and returning to its original state of viscosity when left undisturbed. This property is often observed in gels, suspensions, or pastes.
When a thixotropic substance is unagitated or at rest, it typically exhibits a high viscosity, meaning it is thick and resistant to flowing freely. However, when an external force is applied, such as stirring, shaking, or shearing, the substance undergoes a temporary decrease in viscosity. It starts to flow more easily, becoming thinner and less resistant to movement.
Once the agitation ceases, the substance gradually regains its original state of viscosity, gradually thickening up to its initial consistency. This recovery process can vary in time, ranging from a few seconds to several minutes, depending on the specific thixotropic material.
Thixotropy finds applications in various industries, such as paint manufacturing, cosmetics, pharmaceuticals, and drilling fluids. It allows for easy spreadability, better mixability, and enhanced stability of products. Thixotropic materials are also utilized in areas where controlled flow is desirable, such as in adhesives and lubricants.
Overall, the thixotropic property provides an essential characteristic for numerous substances, enabling them to exhibit reversible changes in their viscosity and flow behavior under applied stress or agitation.
