EMULSIONS

Question 1

Characteristic of emulsions

Answer 1

Thermodynamically unstable
Particle Diameter (.1 to 100 micrometer)
Optically Opaque
Low Surfactant-to-Oil ratio
High surface area

Question 2

What is microemulsions

Answer 2

A mixture of oil, water & surfactant containing colloidal aggregates

Question 3

Characteristic of microemulsion

Answer 3

Thermodynamically stable
Particle Diameter
Optically Transparent
High Surfactant-to-Oil ratio
High Surface Area

Question 4

Nanoemulsions

Answer 4

Consists of two immiscible liquid (usually oil and water), with one liquid being dispersed as very small spherical droplets in the other liquid

Question 5

Characteristic of Nanoemulsions

Answer 5

Thermodynamically unstable
Particle diameter
Optically transparent
Intermediate surfactant-to-Oil ratio
High surface area

Question 6

Homogenization

Answer 6

Process of converting oil and water phases into an emulsion, or of reducing the size of the droplets in an existing emulsioN

Question 7

3 mechanisms of stabilize emulsions by emulsifying agent

Answer 7

1.Reduction of interfacial tension
2.Formation of rigid interfacial film-3.mechanical barrier to coalescence
Formation of an electric double layer-electric barrier to approach of particles

Question 8

Emulsion stabilizer agents

Answer 8

Surfactants
Simple organic electrolytes
Macromolecular stabilizers
Finely divided solids