BS Alkyl Dimethyl Betaine Series: How Performance Evolves from C12 to C18
Compare BS-12, BS-14, BS-16, and BS-18 as alkyl-chain length changes affect CMC, interfacial adsorption, emulsion stability, and corrosion protection.
Article Summary
The BS series uses a simple zwitterionic structure with a linear alkyl chain, so increasing chain length from C12 to C18 creates a clear performance gradient. CMC decreases and interfacial adsorption strengthens, while water solubility falls and longer-chain grades may require preheating.
BS-12 emphasizes rapid foaming, water solubility, and cost efficiency; BS-14 balances interfacial activity and oil-displacement performance; BS-16 favors emulsion stability; and BS-18 provides more persistent interfacial protection and wash resistance. Across the series, pH responsiveness and compatibility with anionic surfactants support flexible formulation design, while quaternary ammonium surfactants remain complementary materials for stronger antimicrobial adsorption.
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