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IP 142 > Interfacial Phenomena > Flashcards

Interfacial Phenomena Flashcards

1
Q

Mass of substance that possesses a well define boundary

A

Phase

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2
Q

Occurs when molecules at the surface of the liquid experience an inward force toward the bulk

A

Surface tension

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3
Q

Force per unit length that must be applied parallel to the surface so as to counterbalance the net inward pull

A

Surface tension

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4
Q

SI unit for surface tension

A

N/m

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5
Q

Cgs system unit for surface tension

A

Dynes/cm

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6
Q

Force per unit length existing at the interface between two immiscible liquid phases

A

Interfacial tension

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7
Q

Often used for the attractive forces between immiscible liquids

A

Interfacial tension

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8
Q

Work done against surface tension to move molecules from the inner layers to the surface

A

Surface Free energy

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9
Q

Measurement of surface and interfacial tensions

A

CDPSDWBO

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10
Q

Choice of method of measurement depends on:

A

SASE

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11
Q

T/F Inc temp inc surface tension

A

F

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12
Q

Equation for capillary rise method

A

Y=rpgh

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13
Q

T/F in capillary rise method, the force of adhesion of the liquid and the wall is less than the cohesion forces of liquid molecules

A

F

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14
Q

Principle is that the force necessary to detach a platinum-iridium ring immersed at the surface or interface is proportional to the surface or interfacial tension

A

DuNouy Ring Method

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15
Q

Equation used for the DuNuoy Ring method

A

Y=(dial reading/2xring circumference) x correction factor (beta)

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16
Q

Free energy required to separate two phases at their boundary or to break the attraction between unlike molecules

A

Work of Adhesion

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17
Q

Equation of work of adhesion

A

Wa=YL+Ys+ YLS

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18
Q

Work required to separate molecules of the spreading liquid so that it can flow over the sublayer

A

Work of Cohesion

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19
Q

When added molecules partitioned in favor of the bulk

A

Negative adsorption

20
Q

When added molecules are partitioned in favor of the interface

A

Positive adsorption

21
Q

Adsorbed at the interface to lower the interfacial tension between phases due to their amphiphilic nature

A

Surfactants

22
Q

0-3 HLB

A

Anti foaming

23
Q

7-9

A

Wetting agents

24
Q

3-8

A

Water in oil emulsifying agents

25
Q

8-16

A

Oil in water

26
Q

16-18

A

Solubilizing agents

27
Q

13-16

A

Detergents

28
Q

Amount of amphiphile per unit area of surface in excess of that in bulk of the liquid

A

Surface excess

29
Q

T/F the addition of amphiphile to a liquid system leads to a reduction in surface tension

A

T

30
Q

Factors that affect the adsorption of gas by a solid

A

chemical nature of adsorbent and adsorbate
Surface area of adsorbent
Temp
Partial pressure of the adsorbed gas

31
Q

Irreversible interface unless the bonds are broken

A

Chemisorption

32
Q

Removal of adsorbate from adsorbent

A

Desorption

33
Q

Describes the relationship between the amount of gas physically adsorbed on the surface of the solid and the equilibrium pressure or concentration at constant temperature

A

Adsorption isotherm

34
Q

A plot of constant temperature

A

Isotherm

35
Q

Aids in displacing an air phase at the surrface, and replaces it with liquid phase

A

Wetting agent

36
Q

Angle which the liquid makes with the solid surface

A

Contact angle

37
Q

Contact angle = 0

A

Complete wetting

38
Q

Surfactants that are used for the removal of dirt

A

Detergents

39
Q

Initial wetting of the dirt and of the surface to be cleaned

A

Detergency

40
Q

Stable structure consisting of air pockets enclosed within films of liquid, the gas-in-liquid dispersion being stabilized by a foaming agent

A

Foam

41
Q

Agents as alcohol, ether, castor oil and some surfactants that break the foam

A

Antifoaming agents

42
Q

Other name for nernst potential

A

Electrothermodynamic potential

43
Q

Defined as the difference in potential between the actual surface and the electroneutral region of the surface

A

Nernst potential

44
Q

Other term for zeta potential

A

Electrokinetic potential

45
Q

Defined as the difference in potential between the surface of the tightly bound layer and the electroneutral region of the solution

A

Zeta potential

46
Q

Happens when the potential is reduced below a certain value, the attractive forces exceed the repulsive forces and the particles come together

A

Flocculation

47
Q

Boundary of separation of two phases

A

Interface

IP 142 (5 decks)

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