8 Surfactants and SAM

8 Surfactants and SAM - Lecture-8 Feb 3 2009 Surfactants...

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Surfactants and Self-Assembled Monolayers Lecture-8 Feb 3, 2009
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Surfactants: Amphiphilic Molecules hydrophobic region + hydrophilic region schematic chemical structure There is a carbon here. With this notation, it is assumed that there are also two hydrogens since carbon needs to form four bonds. These molecules are frequently called surfactants because they tend to cover surfaces and change their properties. The hydrophobic region is often called the tail and the hydrophilic region is often called the charged head group.
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Examples C 12 H 25 OSO 3 Na + C 16 H 33 N + ( CH 3 ) 3 Br C 12 H 25 ( O CH 2 CH 2 ) OH Anionic Cationic Non-ionic Sodium dodecyl sulphate (SDS) Hexadecyl trimethylammonium bromide (CTAB) Pentaoxyethylene dodecyl ether Jacob Israelachvili, Intermolecular and Surface Forces
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Bonds Chemical Physical (many people might also (“non-covalent”) use the word “covalent”) Ionic Ionic (with large ions) Covalent Charge-dipole Metallic Charge-induced dipole Dipole-Dipole Dipole-Induced dipole Induced dipole-Induced dipole van der Waals hydrogen bonding Not everyone agrees on what the term “self-assembly” means, but most agree that it is the formation of ordered structures that are held together by physical (non-covalent) bonds.
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This note was uploaded on 06/05/2010 for the course MATSCI 316 taught by Professor Cui,y during the Winter '08 term at Stanford.

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8 Surfactants and SAM - Lecture-8 Feb 3 2009 Surfactants...

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