What is the particle size of microemulsion?
about 10 nm to 300 nm
A microemulsion is a thermodynamically stable fluid. It is different from kinetically stable emulsions which will be break into oil and water over time. The particle size of microemulsions ranges from about 10 nm to 300 nm. Because of the small particle sizes, microemulsions appear as clear or translucent solutions.
What is microemulsion and multiple emulsion?
“ A micro emulsion is a system, of water ,oil and an amphiphile which is a single optically isotropic and thermodynamically stable liquid solution.”
What is micro and nano emulsion?
The term “micro-” usually means 10−6, while the term “nano-” usually means 10−9, which would imply that nanoemulsions contain particles that are smaller than those in microemulsions. In practice, the opposite is usually the case – the particles in a microemulsion are smaller than those in a nanoemulsion.
Why is microemulsion not a true emulsion?
In contrast to ordinary emulsions, microemulsions form upon simple mixing of the components and do not require the high shear conditions generally used in the formation of ordinary emulsions.
What are the advantages of microemulsion?
Microemulsions have been proposed as drug delivery systems to enhance the absorption of drug across biological membranes (Majuru and Oyewumi, 2009). Some of microemulsions advantages include: (1) increased solubility and stability of drugs, and (2) ease and economical scale-up.
What is the difference between microemulsion and macro emulsion?
Microemulsions are thermodynamically stable systems, whereas macroemulsions are kinetically stable systems . Also, microemulsions are translucent and of low viscosity, while macroemulsions are opaque and of relatively high viscosity.
What is microemulsion method?
2 Microemulsion methods. A microemulsion is a thermodynamically stable transparent, isotropic dispersion of two immiscible liquids such as water and oil stabilized by surfactant molecules at the water/oil interface.
What is micro emulsion example?
22.4. There are three kinds of microemulsions: oil dispersed in water (o/w), water dispersed in oil (w/o), and bicontinuous. The presence of o/w droplets is likely to be a characteristic of microemulsions where the amount of oil is low.
Is microemulsion homogeneous or heterogeneous?
Microemulsions are clear, homogeneous, transparent, thermodynamically stable dispersions of water and oil, stabilized by a surfactant, usually in combination with a cosurfactant (typically a short-chain alcohol).
What is the difference between a micro-emulsion and an emulsion?
Therefore, since micro- means 10 −6. and emulsion implies that droplets of the dispersed phase have diameters close to 10 −3 m, the micro-emulsion denotes a system with the size range of the dispersed phase in the. 10 −6 × 10 −3 m = 10 −9 m range.
What is a mini emulsion?
Mini-emulsion: emulsion in which the particles of the dispersed phase have diameters in the range from approximately 50 nm to 1 μm. Note 1: Mini-emulsions are usually stabilized against diffusion degradation (Ostwald ripening (ref. )) by a compound insoluble in the continuous phase .
What is the size of microemulsion particles?
Note: Diameters of polymer particles formed in the micro-emulsion polymerization usually are between 10 and 50 nm. Microemulsions have many commercially important uses: Much of the work done on these systems have been motivated by their possible use to mobilize petroleum trapped in porous sandstone for enhanced oil recovery.
What is microemulsion polymerization?
Microemulsion polymerization is a complex heterogeneous process where transport of monomers, free radicals and other species (such as chain transfer agent, co-surfactant and inhibitors) between the aqueous and organic phases, takes place.