PHA 327 - Exam 2 - Disperse Systems 3

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kyleannkelsey
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214930
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PHA 327 - Exam 2 - Disperse Systems 3
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2013-04-21 21:14:51
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PHA 327 Exam Disperse Systems
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PHA 327 - Exam 2 - Disperse Systems 3
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  1. What is Thixotropy?
    Reversible gel solution transformation
  2. What is the term for a reversible gel solution transformation?
    Thixotrophy
  3. What happens to Thixotropic substance when you shake it?
    The matrix relaxes and it forms a solution
  4. When a Thixotropic substance is allowed to settle what happens?
    It forms a rigid gel matrix
  5. What example for a thixotropic substance was given in class?
    Bentonite Magma
  6. Bentonite Magma has what type of flow?
    Thixotrophic
  7. What is pseudoplastic flow?
    • The viscosity decreases with increase in the rate of shear
    • No yield value
  8. What examples were given in class for substances that exhibit pseudoplastic flow?
    Polymers in solution
  9. Polymers in solution exhibit what type of flow?
    Pseudoplastic
  10. Newtonian flow is dependent on what variable other than shear or stress?
    Temperature
  11. What does the yield value in substances exhibiting plastic flow mean?
    The increasing rate of shear must reach a point where the Vander wall forces are overcome
  12. A substance with pseudoplastic flow is a Shear ___________ material:
    Thinning
  13. A substance with Dilatant flow is a Shear _____________ material:
    Thickening
  14. What is dilatant flow?
    Increased resistance to flow as shear rate increases
  15. What type of flow has a n increased resistance to flow as the shear rate increases?
    Dilatant
  16. Does dilatant flow have a yield value?
    No
  17. What is the example given in class for a substance with Dilatant flow?
    Dispersion with a high concentration of deflocculated particles
  18. What type of flow does dispersion with a high concentration of deflocculated particles exhibit?
    Dilatant
  19. What does a graph of Pseudoplastic flow look like?
    • The rate of shear(y) rises exponentially as the shearing stress rises (x)
  20. What does a graph of Dilatant flow look like?
    • The shearing stress (x) rises exponentially with┬áthe rate of shear (y)
  21. What does a graph of Newtonian flow look like?
    • The rate of shear (y) increases linearly with the Shearing stress (x)
  22. What does a plastic flow graph look like?
    • The rate of shear (y) increases exponentially with the shearing stress (x), until a yield point, where after it is linear

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