The Hydrophobic Effect: Explained!

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Discussion Overview

The discussion revolves around the hydrophobic effect, particularly its entropic nature and the formation of micelles in aqueous solutions. Participants explore the concept of "freezing" in relation to water structure and the stabilization of micelles through clathrate cages.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant describes the hydrophobic effect as an entropic effect related to the disruption of hydrogen bonds by non-polar molecules, leading to a quasi-ordered water structure and the formation of clathrate cages.
  • Another participant suggests that the term "freezing" should not be taken literally, indicating that it refers to the stabilization of water around micelles rather than an actual freezing process.
  • A participant expresses confusion about the relationship between the disorder of water and hydrogen bonding, questioning whether the formation of micelles leads to stabilization of the water structure.
  • Further clarification is provided that the stabilization applies to both the micelle and water system, with water forming a cage around the micelle.

Areas of Agreement / Disagreement

Participants exhibit some agreement on the concept of stabilization around micelles, but there remains uncertainty regarding the interpretation of "freezing" and the implications for water structure and hydrogen bonding.

Contextual Notes

There are unresolved questions about the definitions and implications of terms like "freezing" and "stabilization," as well as the specific nature of the clathrate cage and its role in the micelle-water system.

rwooduk
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We have been given this description on a slide from class:

The hydrophobic effect is believed to bean entropic effect caused by the energy cost of disrupting many hydrogen bonds by a non-polar molecule, hence disrupting the quasi-ordered water structure,and the freezing of water molecules around the non-polar molecule in a frozen structured watercage. This structure is known as a
clathrate cage.

I don't understand the "freezing" part, what's frozen? It's in reference to the formation of self-assembly of simple micelles, do they form at freezing temperatures? I honestly have no clue.

Thanks for any help trying to understand this.
 
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Don't take the literal meaning of 'freezing' and 'frozen' here.It means that Micelles that are Amphiphatic(phobic and philic at ends) in nature disrupts ordered water structure and arranges themselves such that 'around Micelles ' the water gets frozen (gets stabilized in actual sense) forming a watercage.
 
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kiritee Gak said:
Don't take the literal meaning of 'freezing' and 'frozen' here.It means that Micelles that are Amphiphatic(phobic and philic at ends) in nature disrupts ordered water structure and arranges themselves such that 'around Micelles ' the water gets frozen (gets stabilized in actual sense) forming a watercage.

Thanks for the reply. Hmm, thanks for explaining the frozen part. I'm still a little lost as I thought it was the disorder of the water that allowed for hydrogen bonding and formation, are you saying that this formation brings about stabilization of the water? Also, may I ask, this "cage" what exactly is it?

Thanks again.
 
No this does not just bring the stabilization for water but it brings it for both Micelle+Water system.Water forms a cage(clathrate) around it so that it can hold Micelle.
 
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kiritee Gak said:
No this does not just bring the stabilization for water but it brings it for both Micelle+Water system.Water forms a cage(clathrate) around it so that it can hold Micelle.

That's very helpful, many thanks!
 

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