Rheology in Pharmaceutical Sciences

The study of the deformation and flow of materials.

A type of deformation that is reversible; the material returns to its original shape after the stress is removed.

Rheology describes how a material changes shape or flows in response to a force or stress.

Stress applied tangentially to a surface, causing deformation.

A measure of a liquid's resistance to flow.

Stress applied perpendicular to a surface, pulling it apart.

Units of measurement for viscosity in the CGS system.

Viscosity of a liquid decreases with increasing temperature.

Viscosity is used to prolong the contact time of medicaments in the eye.

Higher viscosity means paints stay in contact with skin longer.

Certain pharmaceutical formulations need consistent viscosity for quality and effectiveness.

Flow exhibited by polymers in solution; viscosity decreases with increasing shear rate.

Consistency curve starts at origin or approaches at low shear rates.

Viscosity of a pseudo-plastic material cannot be expressed by a single value, as it changes with shear stress.

Shearing stress aligns long-chain molecules in the direction of flow.

Concrete.

The curved graph of a pseudo-plastic material's viscosity against shear rate.