👉 The Jacksonville fluid, also known as the Jacksonville viscoelastic fluid, is a complex non-Newtonian fluid that exhibits both viscous and elastic properties. It was first synthesized by researchers at the University of Florida in 1969 and is characterized by its ability to change viscosity under stress, behaving like a solid when subjected to low shear rates and flowing like a liquid when subjected to high shear rates. This unique behavior is due to its microstructure, which consists of long, entangled polymer chains that can stretch and align under stress, providing the fluid with its distinctive elastic response. The Jacksonville fluid is widely used in rheological studies to understand the behavior of complex fluids, particularly in applications involving polymers, biological materials, and other viscoelastic substances.