Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
7 Cards in this Set
- Front
- Back
|
Name 5 optimal characteristics for suspensions.
|
- Suspended particles should remained dispersed and not settle rapidly
- Settled particles should re-disperse easily. - Particle size should remain constant - Should possess proper viscosity and flow - Should exhibit pseudo plastic/plastic thixotropy |
|
|
What is Thixotropy?
|
When the suspension is sitting, it should thicken. When it is shaken it should thin.
|
|
|
Name 2 things you shouldn't do with a suspension.
|
- Do not shake before use
- Do not pour in measuring cup |
|
|
What is Rheology?
|
The study of flow - Addresses the viscosity characteristics of powders, fluids, and semisolids. Two categories = Newtonian and Non-Newtonian
|
|
|
What is the equation for Shear Rate and Shear Stress?
|
F/A = (Visc. Coef) x dv/dr
Shearing Stress = Viscosity coefficient x Rate of Shear |
|
|
In terms of viscosity, what is the different between Newtonian and Non-Newtonian systems?
|
Newtonian - Shear rate is independent of viscosity
Viscosity remains the same. Non- Newtonian - viscosity changes with increased shear rate |
|
|
What is F? What is G? What is their relationship?
|
F = Force required to result in flow (G)
G = Rate of Shear Viscosity Coefficient = F/G F = F/A G = dv/dr |
