Amphipathic

1. Ionic Molecules
• Anionic (with respect to the charge on the group maintaining hydrophobia). Examples are:
• fatty acids: RCO₂^-Na⁺;
• sulfates: RSO₄^-Na⁺;
• sulfonates: RSO₃^-Na⁺.
• Cationic. These are generically bactericidal and hence non-biodegradable.
2. Amphoteric Molecules. Examples are phospholipids, one of the main constituents of biological membranes: they insulate the cells from the surrounding medium.
3. Non-Ionic Molecules. A small polymer is grafted onto a hydrophobic segment.
4. Block Copolymers
5. Floation additives

See also

• Free surface energy
• Sodium dodecyl sulfate
• Surfactant

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