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Instability of formulations (Flocculation (process wherein colloids come…
Instability of formulations
Sedimentation
tendency for particle in the suspension to settle out of the fluid in which they are entrained and come to rest agaionst a barrier
this is due to the motion through the fluid in respond to the force acting on it (gravity, centrifugal acceleration or electromagnetism)
Creaming
migration of the dispersed phase of the emulsion
under the influence of buoyancy
particles float upward or sinks depending on the density, viscosity
undesirable because it causes difficulties in storage and handling
desirable to concentrate emulsion
Phase inversion
phenomenon that occurs when agitated oil in water emulsion
reverts to a water in oil and vice versa
important in industrial process to make stable emulsion
driven by the composition or temperature changes
Coalescence
process in which two phase domains of the same composition come together and form a larger phase domain
two phase domain come together and form a larger phase domain
two or more separate masses of miscible substances seem to "pull" each other together should they make the slightest contact.
Ostwald Ripening
observed phenemenon in solid solutions or liquid sols that describes the change of an inhomogeneous structure over time
small crystals or sol particles dissolve and redeposit onto larger crystals or sol particles through the continuous phase
found in water oil-in-oil emulsions
Flocculation
process wherein colloids come out of suspension in the form of floc or flake either spontaneously or due to the addition of a clarifying agent
are merely suspended in a liquid and not actually dissolved in a solution
no formation of cake
all flocs are in the suspension
important in processes in water treatment
found in oil-in-water emulsions
