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The velocity of sedimentation has what units?
Cm/sec
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What is the velocity of sedimentation proportional to?
The Diameter ^2 and g (acc. Due to gravity)
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The diameter of the particle to the second power and the acceleration due to gravity are proportional to what other component of sedimentation?
The velocity of sedimentation
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What process can be used for separation of colloidal particles?
Ultracentrifugation
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Define osmotic pressure:
The pressure to be applied to a pure solvent to prevent it from passing into a solution by osmosis
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What is viscosity?
The measure of resistance to liquid flow
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What is the unit of viscocity?
Centipoise (cPs)
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What characteristic is measured in centipoise (cPs)?
Viscosity
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What are the three examples of liquids that exhibit Newtonian flow given in class?
- Glycerin
- Water
- Ethyl Alcohol
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Glycerine, Ethyl Alcohol and Water all exhibit what type of flow?
Newtonian
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What is Newtonian flow?
Rate of Shear is linearly related to Shearing stress
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What type of Non-Newtonian flow exist?
- Plastic
- Pseudoplastic
- Dilatant
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What example was given in class of a liquid that displays plastic flow?
Flocculated particles in suspensions
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Flocculated particles in suspensions exhibit what type of flow?
Plastic (Non-Newtonian)
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Describe Plastic flow:
- Viscosity decreases with increasing rate of shear
- Elastic fluid until it meets the yield value then it exhibits Newtonian Flow
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What type of flow has decreasing viscosity with increasing rate of shear and behaves like an elastic fluid before reaching a yield value, after which it behave Newtonian?
Plastic Flow
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What is stokes equation?
 - v =velocity of sedimentation (cm/sec)
- d =diameter of the particle
- n =viscosity of the medium
- g =acceleration due to gravity
- δp =density of the particle
- δo =density of the medium
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The settling of particles can be described by what equation?
Stokes
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Stoke equation describes what?
The sedementation of particles
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What is the equation for Diffusion?
- D = Diffusion coefficient
- R = Gas constant
- T = Absolute temp
- η = Viscosity of the solvent
- r = radius of the particle
- N = Avogadro’s number
- M = Molecular weight of the colloidal particle
- ῡ= partial specific volume
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