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IP 142 > 2nd Exam-Colloidal Dispersions > Flashcards

2nd Exam-Colloidal Dispersions Flashcards

1
Q

Particle size of colloidal dispersion

A

1 nm - 5 um

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2
Q

Particle size of coarse dispersion

A

> 0.5 um

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3
Q

T/F Coarse dispersions are microheterogenous

A

F. Colloidal ang microheterogenous

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4
Q

Example of solid dispersed phase in gas dispersion medium

A

Solid aerosols, smoke, dust

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5
Q

Example of gas DP in gas DM

A

wala.

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6
Q

Foams have ___ DP in __ DM

A

Gas. Liquid

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7
Q

Liquid in solid examples

A

Absorption bases

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8
Q

Solid in liquid examples

A

Sols

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9
Q

Visibility of colloidal dispersion

A

Electron microscope

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10
Q

substances that do not diffuse through a semi-permeable membrane

A

Colloid

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11
Q

Heterogenous

A

Lyophobic

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12
Q

Homogenous

A

Lyophilic

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13
Q

Amphiphiles

A

Association

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14
Q

how do hydrophilic colloids aquire a charge

A

Ionization

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15
Q

acid treated gelatin –> charge? pH?

A

+ 4-4.5

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16
Q

base treated gelatin –> charge? pH?

A

8

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17
Q

composed of materials that do not have affinity to the dispersion medium & are not solvated (solvent-hating) → due to the absence of solvent sheath around the particle

A

Lyophobic colloids

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18
Q

characterized by having two distinct regions of opposing solution affinities within the same molecule or ion

A

association colloids

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19
Q

other name for association colloids

A

amphiphilic colloids

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20
Q

size of molecular dispersoin

A
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21
Q

excess surfactant that aggregates in the bulk of the solution

A

micelle

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22
Q

aggregates that contain 50 or more monomers

A

micelles

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23
Q

diameter ranges from ____

A

50 – 80 angstroms

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24
Q

may increase the solubility of poorly water soluble compounds

A

Micelles

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25
Q

concentration of monomer at which the micelles is formed

A

Critical Micelle Concentration

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26
Q

number of monomers that aggregate to form a micelle

A

Aggregation number

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27
Q

T/F In aqueous solutions, the CMC is reduced by the addition of electrolytes

A

T

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28
Q

colloidal particles appear as tiny points of light in constant motion when examined under an ultramicroscope

A

Brownian movement

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29
Q

particles are kept dispersed throughout the dispersing medium by random collisions with other molecules

A

Brownian movement

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30
Q

spontaneous movement of particles from a region of higher solute concentration to one of lower concentration until equilibrium is achieved

31
Q

Heterogenous

32
Q

Homogenous

33
Q

Amphiphiles

A

Association

34
Q

how do hydrophilic colloids aquire a charge

A

Ionization

35
Q

acid treated gelatin –> charge? pH?

36
Q

base treated gelatin –> charge? pH?

37
Q

composed of materials that do not have affinity to the dispersion medium & are not solvated (solvent-hating) → due to the absence of solvent sheath around the particle

A

Lyophobic colloids

38
Q

characterized by having two distinct regions of opposing solution affinities within the same molecule or ion

A

association colloids

39
Q

other name for association colloids

A

amphiphilic colloids

40
Q

size of molecular dispersoin

41
Q

excess surfactant that aggregates in the bulk of the solution

42
Q

differs from electroosmosis in that the potential is created by forcing a liquid to flow through a plug or bed of particles

A

Streaming potential

43
Q

diameter ranges from ____

A

50 – 80 angstroms

44
Q

may increase the solubility of poorly water soluble compounds

45
Q

concentration of monomer at which the micelles is formed

A

Critical Micelle Concentration

46
Q

number of monomers that aggregate to form a micelle

A

Aggregation number

47
Q

T/F In aqueous solutions, the CMC is reduced by the addition of electrolytes

48
Q

colloidal particles appear as tiny points of light in constant motion when examined under an ultramicroscope

A

Brownian movement

49
Q

particles are kept dispersed throughout the dispersing medium by random collisions with other molecules

A

Brownian movement

50
Q

spontaneous movement of particles from a region of higher solute concentration to one of lower concentration until equilibrium is achieved

51
Q

T/F Diffusion is a direct result of Brownian movement

52
Q

Define diffusion

  1. inc particle size
  2. dec temp
  3. dec viscosity
A
  1. inc
  2. dec
  3. inc
53
Q

osmotic pressure (π) of a dilute colloidal solution is described by what equation

A

van’t hoff equation

54
Q

enable the determination of the molecular weight of colloids and give information on the shape of the particles in solution

55
Q

T/F spherocolloids have high viscosity

56
Q

T/F spherocolloids have higher viscosity than linear colloids

57
Q

ability to scatter or disperse light

A

Tyndall effect

58
Q

movement of charged surface with respect to an adjacent liquid phase

A

Electrokinetic phenomena

59
Q

movement of particle through
a liquid under the influence of an applied potential difference due to the existence of an electric charge on the surface of the particles

A

electrophoresis

60
Q

liquid moves relative to the charged surface; the liquid moves through a plug or membrane across which a potential is applied

A

eletroosmosis

61
Q

reverse of electrophoresis; creation of a potential when particles undergo sedimentation

A

Sedimentation potential

62
Q

differs from electroosmosis in that the potential is created by forcing a liquid to flow through a plug or bed of particles

A

Streaming potential

63
Q

Mechanical preparation of colloids

A

Mill, crusher, mixer

64
Q

Electrical preparation of colloids

A

electrolytic spraying

65
Q

process of passing of a precipitate into colloidal particles by adding electrolytes

A

Peptization

66
Q

a colloidal gel in which water is the dispersion medium

67
Q

small (0.2 – 5 um) loaded microspheres of natural and synthetic polymers

A

Microparticles

68
Q

carrier for vaccines and anticancer drugs

A

Microparticles

69
Q

excellent candidate as potential drug delivery systems because of their improved drug solubilization

A

Emulsions and microemulsions

70
Q

consist of an outer uni- or multilamellar membrane and inner liquid core; formed from natural or synthetic phospholipids similar to those in cellular plasma membrane

71
Q

structures similar to liposomes, but do not have an inner liquid compartment

72
Q

can be used as water-soluble biocompatible microcontainers for the delivery of poorly soluble hydrophobic pharmaceuticals

73
Q

submicroscopic colloidal drug carriers systems composed of an oily or an aqueous core surrounded by a thin polymer membrane

A

nanocapsules

74
Q

inorganic nanostructures that interface with biologic systems; for site- targeted drug delivery system

A

nanocrystals

IP 142 (5 decks)

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