Physical Pharmacy Lecture 9: Rheology
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Questions and Answers

What is rheology?

  • The science of fluid dynamics
  • The study of drug manufacturing processes
  • The study of chemical reactions in pharmaceutical formulations
  • The science concerned with the deformation of matter under the influence of stress (correct)

    • Which type of liquids follow Newtonian's law of flow?

  • Water and glycerol (correct)
  • Most pharmaceutical formulations
  • Colloidal suspensions and emulsions
  • Diluted suspensions and ointments

    • What is viscosity?

  • An expression of the resistance of a fluid to flow (correct)
  • The rate of flow of a fluid
  • The measure of density of a fluid
  • The ability of a fluid to dissolve solutes

    • What type of deformation is exhibited by elastic bodies?

    <p>Spontaneous and reversible deformation</p> Signup and view all the answers

    What are non-Newtonian liquids characterized by?

    <p>Viscosity that changes with applied shear force</p> Signup and view all the answers

    Study Notes

    Rheology

    • Rheology is the study of the flow and deformation of materials, particularly non-Newtonian fluids.
    • It examines how materials respond to applied forces and their ability to change shape or flow.

    Newtonian Liquids

    • Newtonian liquids follow Newton's law of flow, where the viscosity remains constant regardless of the applied shear rate.
    • Common examples include water and most simple acids or alcohols.

    Viscosity

    • Viscosity is a measure of a fluid's resistance to flow or deformation, indicating how thick or thin a fluid is.
    • High viscosity fluids flow slowly (like honey), while low viscosity fluids flow easily (like water).

    Deformation in Elastic Bodies

    • Elastic bodies exhibit elastic deformation, which is reversible; they return to their original shape after the applied stress is removed.
    • Examples include rubber and metallic springs.

    Non-Newtonian Liquids

    • Non-Newtonian liquids do not have a constant viscosity; their flow behavior changes under different levels of stress or shear rates.
    • They can be categorized into various types, such as shear-thinning (pseudoplastic), shear-thickening (dilatant), and thixotropic fluids.

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    Description

    Explore the concept of rheology in physical pharmacy, which involves the study of the deformation of matter under stress. Learn about viscosity and its relevance in pharmaceutical science.

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