Dispersed Formualtions WS W2 Flashcards
1
Q
What is the primary cause of particle movement in small particles?
A
Brownian motion
2
Q
What is the primary factor that influences the sedimentation rate of a larger particles in a suspension?
A
Viscosity of the medium
3
Q
What is the primary advantage of a flocculated system in pharmaceutical formulations?
A
It is easily resuspended by shaking
4
Q
What happens to particles in a deflocculated system?
A
They eventually formed a dense contact sediment
5
Q
What is X, Y and Z on the potential separation diagram?
A
X = 1° max
Y = 2° min
Z = 1° min
6
Q
Which describes a primary role of polymers in pharmaceutical dispersion
A
To stabilise the dispersion by preventing particle aggregation
7
Q
What is the outcome of Ostwald ripening?
A
The growth of large particles at the expensive smaller ones
