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Zwitterionic Surfactants are amphiphilic molecules containing:
Hydrophilic Head: Both cationic (+) and anionic (-) charges (net neutral)Hydrophobic Tail: Alkyl or aryl chain (e.g., C12–C18)Example Structures:
Betaines: R-N⁺(CH₃)₂-CH₂-COO⁻ (e.g., Cocamidopropyl betaine)Sulfobetaines: R-N⁺(CH₃)₂-CH₂-CH₂-SO₃⁻| Property | Advantage | Measurement Method |
|---|---|---|
| Mildness | Low skin/eye irritation | In vitro cytotoxicity assays |
| Biodegradability | Environmentally friendly | OECD 301 standards |
| Foam Stability | Excellent lather formation | Ross-Miles foam test |
| Salt Tolerance | Stable in hard water/brine | Conductivity titration |
| Industry | Use Case | Example Product |
|---|---|---|
| Personal Care | Shampoos, body washes | Cocamidopropyl betaine (CAPB) |
| Pharmaceuticals | Drug delivery systems | Phospholipid-based liposomes |
| Food Processing | Emulsifiers for sauces | Lecithin derivatives |
| Enhanced Oil Recovery | Wettability alteration | Sulfobetaines for reservoir flooding |
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