Rheology:
Rheology is the
study of the flow and deformation properties of the matter.
Viscosity:
The viscosity of
a fluid is its resistance to flow or movement.
According to
flow, fluids are of two types. They are:-
1.
Newtonian
Fluids &
2.
Non-
Newtonian Fluids.
1. Newtonian Fluids:- Liquids which follow
Newton’s law of viscous flow are known as newtonian’s liquids.
2.
Non-Newtonian
Fluids:- Liquids which do not follow Newton’s law are known as non-newtonian
fluids.
Example:
Colloidal dispersion, emulsions, suspensions and ointments.
Shearing Stress:
The force per
unit area F/A required to bring about flow is called the “Shearing Stress”
·
The
flow properties of Non-Newtonian Materials are three types. They are:-
1.
Plastic
flow
2.
Pseudo
plastic flow
3.
Dilatants
flow.
Dispersed System:
A dispersed
system is defined as a system in which one phase, the dispersed phase, is
distributed uniformly as particles throughout another phase, called the
sispersion medium or continuous phase.
Colloidal Dispersion:
If the particles
have a size ranging from 1 nm to 1 µm, which is dispersed in the continuous
phase, this system is called colloidal dispersion.
Colloids:
The particles
have a size ranging from 1 nm to 1 µm is called colloids.
Because of their large surface area, colloids show greater efficiency
for absorption or adsorption.
|
Coarse Dispersion:
The size of the
dispersed particles ranging from 1 µm to 100 µm, which is dispersed in the
continuous phase, this system is called coarse dispersion.
Daniela Camara.
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