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IP 142 > 2nd Exam-Colloidal Dispersions > Flashcards

2nd Exam-Colloidal Dispersions Flashcards

(74 cards)

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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
concentration of monomer at which the micelles is formed
Critical Micelle Concentration
26
number of monomers that aggregate to form a micelle
Aggregation number
27
T/F In aqueous solutions, the CMC is reduced by the addition of electrolytes
T
28
colloidal particles appear as tiny points of light in constant motion when examined under an ultramicroscope
Brownian movement
29
particles are kept dispersed throughout the dispersing medium by random collisions with other molecules
Brownian movement
30
spontaneous movement of particles from a region of higher solute concentration to one of lower concentration until equilibrium is achieved
Diffusion
31
Heterogenous
Lyophobic
32
Homogenous
Lyophilic
33
Amphiphiles
Association
34
how do hydrophilic colloids aquire a charge
Ionization
35
acid treated gelatin --> charge? pH?
+ 4-4.5
36
base treated gelatin --> charge? pH?
8
37
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
Lyophobic colloids
38
characterized by having two distinct regions of opposing solution affinities within the same molecule or ion
association colloids
39
other name for association colloids
amphiphilic colloids
40
size of molecular dispersoin
41
excess surfactant that aggregates in the bulk of the solution
micelle
42
differs from electroosmosis in that the potential is created by forcing a liquid to flow through a plug or bed of particles
Streaming potential
43
diameter ranges from ____
50 – 80 angstroms
44
may increase the solubility of poorly water soluble compounds
Micelles
45
concentration of monomer at which the micelles is formed
Critical Micelle Concentration
46
number of monomers that aggregate to form a micelle
Aggregation number
47
T/F In aqueous solutions, the CMC is reduced by the addition of electrolytes
T
48
colloidal particles appear as tiny points of light in constant motion when examined under an ultramicroscope
Brownian movement
49
particles are kept dispersed throughout the dispersing medium by random collisions with other molecules
Brownian movement
50
spontaneous movement of particles from a region of higher solute concentration to one of lower concentration until equilibrium is achieved
Diffusion
51
T/F Diffusion is a direct result of Brownian movement
T
52
# Define diffusion 1. inc particle size 2. dec temp 3. dec viscosity
1. inc 2. dec 3. inc
53
osmotic pressure (π) of a dilute colloidal solution is described by what equation
van't hoff equation
54
enable the determination of the molecular weight of colloids and give information on the shape of the particles in solution
viscosity
55
T/F spherocolloids have high viscosity
F
56
T/F spherocolloids have higher viscosity than linear colloids
F
57
ability to scatter or disperse light
Tyndall effect
58
movement of charged surface with respect to an adjacent liquid phase
Electrokinetic phenomena
59
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
electrophoresis
60
liquid moves relative to the charged surface; the liquid moves through a plug or membrane across which a potential is applied
eletroosmosis
61
reverse of electrophoresis; creation of a potential when particles undergo sedimentation
Sedimentation potential
62
differs from electroosmosis in that the potential is created by forcing a liquid to flow through a plug or bed of particles
Streaming potential
63
Mechanical preparation of colloids
Mill, crusher, mixer
64
Electrical preparation of colloids
electrolytic spraying
65
process of passing of a precipitate into colloidal particles by adding electrolytes
Peptization
66
a colloidal gel in which water is the dispersion medium
Hydrogel
67
small (0.2 – 5 um) loaded microspheres of natural and synthetic polymers
Microparticles
68
carrier for vaccines and anticancer drugs
Microparticles
69
excellent candidate as potential drug delivery systems because of their improved drug solubilization
Emulsions and microemulsions
70
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
Liposomes
71
structures similar to liposomes, but do not have an inner liquid compartment
Micelles
72
can be used as water-soluble biocompatible microcontainers for the delivery of poorly soluble hydrophobic pharmaceuticals
Micelles
73
submicroscopic colloidal drug carriers systems composed of an oily or an aqueous core surrounded by a thin polymer membrane
nanocapsules
74
inorganic nanostructures that interface with biologic systems; for site- targeted drug delivery system
nanocrystals

IP 142 (5 decks)

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