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ADSORPTION. Surface Activity of Solutes. Solute, c. . .  o. Solute, c. Solutes that decrease surface tension are called “surfactants”. Here is me. I am trying to get your attention now. . . Adsorption. More solute we have more surface tension (free energy) is - unfavorable

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Presentation Transcript
surface activity of solutes
Surface Activity of Solutes

Solute, c

o

Solute, c

Solutes that decrease surface tension are called “surfactants”

adsorption4

Adsorption

More solute we have more surface tension (free energy) is - unfavorable

Solute is repelled by

surface

More solute we have less surface tension (free energy) is - favorable

As a result solute concentrates onto surface - adsorption

specific adsorption
Specific Adsorption

Surface area, 

 - thickness of

adsorption layer

“Volume” of adsorption layer, .

Solute concentration, c

Surface concentration, c 

Specific adsorption, 

adsorption isotherms
Adsorption Isotherms

Langmuir isotherm

max

(for a solution)

c or p

(for a gas)

more adsorption isotherms
More Adsorption Isotherms

(a) Langmuir

(b) Multilayer formation

first layer

c or P

c or P

(c) “Positive cooperativity”

(d) Hysteresis

c or P

c or P

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