Coarse Dispersion

Question 1

Emulsion types

Answer 1

O/w, w/o, multiple emulsions

Question 2

Emulsifying agents that adsorbed at oil-water interfaces to form monomolecular films and reduce interfacial tension

Answer 2

Surface-active agents

Question 3

Emulsifying agents which form a multimolecular film around the dispersed droplets

Answer 3

Hydrophilic colloids

Question 4

Emulsifying agents which are adsorbed at the interface between two immiscible liquid phases and form what amounts to a film of particles around the dispersed globules

Answer 4

Finely divided solid particles

Question 5

Polar non polar nature of the emulsifying agent

Answer 5

Hydrophile-Lipophile Balanch

Question 6

Results from the flocculate and cocentration of the globhesf kf of internal pbase

Answer 6

Creaming

Question 7

Concentration of the internal phase above which the emulsifying agent cannot produce a stable emulsion of the desired type

Answer 7

Critical point

Question 8

Motion of the entire volume of emulsion in the field due to the pressure exerted by the immersion objective on the cover glass, evaporation of the continuous phase, or convection currents from heating by light source

Answer 8

Field flow

Question 9

Indicates the relative change in conductivity between two cycles

Answer 9

Stability Index

Question 10

Consists of large or swollen micelles containing the internal phaae

Answer 10

Microemulsions

Question 11

Coarse dispersion in which insoluble solid particles are dispersed in liquid medium

Answer 11

Suspensions

Question 12

T/F there is an inc in surface free energy as the particle size increases

Answer 12

F dec dapat

Question 13

T/F inc size will lead to an inc in surface potential

Answer 13

F

Question 14

Weakly bonded, settle rapidly, do not form cake

Answer 14

Flocculated suspension

Question 15

Used to describe the settling of flocculated suspension

Answer 15

Subsidence

Question 16

Ratio of the sedimentation volume of the flocculated suspension to the sedimentation volume of the suspension when deflocculated

Answer 16

Degree of Flocculation

Question 17

Sheer thinning property of these vehicles facilitate re-formation of a uniform dispersion once shear is applied

Answer 17

Structured vehicles

Question 18

Can be ascertained by observing the contact angle between the powder and the surface of the liquid

Answer 18

Wettability

Question 19

Sulfur, Charcoal, and magnesium stearate

Answer 19

Hydrophobic

Question 20

Zinc oxide, talc and magnesium carbonate

Answer 20

Hydrophilic

Question 21

Added to retard sedimentation of flocs

Answer 21

Suspending agents

Question 22

Produce flocs that are compatible with negatively charged suspending agents

Answer 22

Anionic electrolytes

Question 23

Acts as flocculating agents by reducing the electric barrier between the particles, as evidenced by a decrease in zeta potential and the formation of a bridge between the adjacent particles so as to link them together in a loosely arranged structure

Answer 23

Electrolytes

Question 24

Decreases the interfacial tension between solid prticles and liquid vehicle, facilitates wetting and deflocculation

Answer 24

Surfactants

Question 25

Produce flocs that are compatible with negatively charged particles

Answer 25

Anionic electrolytes

Question 26

Thermodynamically unstable system

Answer 26

Emulsions

Question 27

Significant increase in the viscosity of dispersion

Answer 27

Auxillary effect