What is an emulsion in chemistry GCSE?
If oil and water are shaken together, tiny droplets of one liquid spread through the other liquid, forming a mixture called an emulsion. Emulsions are thicker than the oil or water they contain. This makes them useful in foods such as salad dressings and ice cream. Emulsions are also used in cosmetics and paints.
What does emulsions mean in science?
emulsion, in physical chemistry, mixture of two or more liquids in which one is present as droplets, of microscopic or ultramicroscopic size, distributed throughout the other.
What are emulsions answer?
An emulsion is a type of colloid formed by combining two liquids that normally don’t mix. In an emulsion, one liquid contains a dispersion of the other liquid. Common examples of emulsions include egg yolk, butter, and mayonnaise. The process of mixing liquids to form an emulsion is called emulsification.
What causes coalescence in emulsions?
28.6. Coalescence of emulsions is an irreversible process by which two or more droplets merge during contact to form a single daughter droplet. The driving force for emulsion coalescence is the thinning and disruption of the liquid film between the droplets (Fig. 28.9).
How do Emulsifiers work Higher chemistry?
Emulsifiers have a similar structure to fats and oils. One or two fatty acid groups can be added to a molecule of glycerol. They are made by reacting edible oils with glycerol. While they form ester links with the glycerol backbone, there are still unused hydroxyl group(s) on the molecule.
How emulsions are formed?
Emulsion are formed by agitation two immiscible liquids such as oil and water together with the presence of an emulsifier, which can be for example a protein, phospholipid or even nanoparticle.
What is emulsion in pharmacology?
Pharmaceutical emulsions are liquid disperse systems in which the dispersed phase is composed of small globules of a liquid distributed throughout a vehicle in which it is immiscible.
What are emulsions pharmaceutics?
An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable) owing to liquid-liquid phase separation. Emulsions are part of a more general class of two-phase systems of matter called colloids.
Why emulsion is formed?
What causes an emulsion?
An emulsion is formed when two nonsoluble liquids (e.g., an oil and water) are agitated together to disperse one liquid into the other, in the form of drops. Emulsions can either be oil-in-water (O/W) or water-in-oil (W/O), depending on whether the continuous phase is the water or the oil, respectively.
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