elastic
A conservative property in which part of the mechanical energy used to produce deformation is stored in the material and recovered on release of stress.electroviscous
The collective effects by which the presence of an electrical double-layer influences the flow behavior of a liquid. The double-layer is usually associated with charged particles suspended in the liquid or polyelectrolytes dissolved in solution. There are three electroviscous effects:primary
The increase of fluid viscosity due to distortion of the double-layer during shear. Distortion exerts a drag, increasing energy dissipation.secondary
The increase of fluid viscosity due to the interaction or overlap of adjacent double-layers. Responsible for the formation of gelatin.tertiary
The variation in fluid viscosity that arises from geometrical changes within the fluid due to double-layer interactions. The viscosity of a polyelectrolyte solution depends on the conformation of the molecules, which in turn is affected by intramolecular electrostatic interactions between charged segments located along the polymer backbone or on side chains.plastic
The property of a solid body that is in the elastic state when the stress is below a critical value, termed the yield stress, and in the plastic state when this value is exceeded. During ideal plastic flow, energy dissipation and stress are independent of the rate of deformation.viscoelastic
A time-dependent property in which a material under stress produces both a viscous and an elastic response. A viscoelastic material will exhibit viscous flow under constant stress, but a portion of mechanical energy is conserved and recovered after stress is released. Often associated with polymer solutions, melts and structured suspensions, viscoelastic properties are usually measured as responses to an instantaneously applied or removed constant stress or strain or a dynamic stress or strain.viscoelectric
An effect by which the electric field near a charged interface influences the structure of the surrounding fluid and thereby modifies the viscosity of the fluid.viscoplastic A hybrid property in which a material behaves like a solid below some critical stress value, the yield stress, but flows like a viscous liquid when this stress is exceeded. Often associated with highly aggregated suspensions and polymer gels.
viscous
The tendency of a liquid to resist flow as a result of internal friction. During viscous flow, mechanical energy is dissipated as heat and the stress that develops depends on the rate of deformation.