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Aug 20, 2018 · The key types are oil-in-water (O/W) and water-in-oil (W/O) emulsions. Emulsions have various pharmaceutical applications like masking unpleasant tastes and enhancing drug absorption. Emulsion stability and type depend on factors like the emulsifying agent used, its HLB value, and emulsion preparation method.
Dec 13, 2015 · Emulsion A: Two immisicble liquids, not emulsified; B: An emulsion of Phase B dispersed in Phase A; C: The unstable emulsion progressively separates; D: The (purple) surfactant positions itself on the interfaces between Phase A and Phase B, stabilizing the emulsion An emulsion is a thermodynamically unstable system consisting of at least two immiscible liquid phases, one of which is dispersed as globules in the other liquid phase, stabilized by the presence of an emulsifying agent.
Sep 28, 2020 · Emulsion A: Two immisicble liquids, not emulsified; B: An emulsion of Phase B dispersed in Phase A; C: The unstable emulsion progressively separates; D: The (purple) surfactant positions itself on the interfaces between Phase A and Phase B, stabilizing the emulsion An emulsion is a thermodynamically unstable system consisting of at least two immiscible liquid phases, one of which is dispersed as globules in the other liquid phase, stabilized by the presence of an emulsifying agent.
What is an Emulsion? an emulsion is a liquid in liquid dispersion a (polymer) solution is also a liquid (polymer) solutions can form emulsions an emulsion droplet interface has at any point the same interfacial tension (in contrast to many suspension particles) sometimes emulsions are subdivided arbitrarily regarding
Emulsions Definition These are homogenous, transparent and thermodynamically stable dispersion of water and oil stabilized by surfactant and co-surfactants Consists of globules less than 0.1 μm in diameter Types Oil dispersed in water (o/w) - oil fraction low Water dispersed in oil (w/o) - water fraction low Bicontinuous (amount of oil and water are same) Advantages Thermodynamically stable, long shelf life Potential reservoir of lipophilic or hydrophilic drug Enhance the absorption and ...
Emulsions Suspensions These are biphasic liquid preparations containing two immiscible liquids one of which is dispersed as minute globules into the other These are biphasic liquid dosage form of medicament in which finely divided solid particles are dispersed in a liquid Globule size of the dispersed liquid is in the range of 0.25 to 25µm Particle size of suspended solid is in the range of 0.5 to 5 microns Emulsifying agent is required to make a stable emulsion Suspending agent is required ...
Creaming – When the droplets in an emulsion rise to the top of the emulsion under the influence of buoyancy or centripetal force, it results in the creaming of emulsion Ostwald Ripening – It describes the change of an inhomogeneous structure over time, i.e., small crystals or sol particles dissolve and redeposit onto larger crystals or sol particles.
