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ADSORPTION

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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ADSORPTION

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  1. ADSORPTION

  2. Surface Activity of Solutes Solute, c   o Solute, c Solutes that decrease surface tension are called “surfactants”

  3. Here is me. I am trying to get your attention now.

  4.  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

  5. Specific Adsorption Surface area,   - thickness of adsorption layer “Volume” of adsorption layer, . Solute concentration, c Surface concentration, c  Specific adsorption, 

  6. Adsorption Isotherms  Langmuir isotherm max (for a solution) c or p (for a gas)

  7. 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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