Surfactant — definition?
Amphiphilic molecule reducing surface tension.
Amphiphilic molecule — role?
Contains both hydrophilic and lipophilic regions.
Lipophilic tail — function?
Associates with oils and fats.
Hydrophilic head — role?
Interacts with water molecules.
Synthetic surfactants — source?
Derived from petrochemicals.
Natural surfactants — source?
From renewable raw materials like sugars and fats.
Surfactant classification — basis?
Type of hydrophilic head: anionic, cationic, amphoteric, non-ionic.
Hydrophilic raw materials — examples?
Sugars, peptides, amino acids.
Lipophilic raw materials — examples?
Oils, fats, fatty acids, fatty alcohols.
Anionic surfactants — charge?
Negatively charged head groups.
Cationic surfactants — charge?
Positively charged head groups.
Amphoteric surfactants — pH behavior?
Charge depends on pH; zwitterionic near pHi.
Non-ionic surfactants — charge?
Uncharged, pH-insensitive head groups.
Surface tension — effect of surfactants?
Reduces surface tension for better wetting.
Critical micellar concentration — meaning?
Concentration at which micelles form.
Krafft temperature — significance?
Min temperature for micelle formation in ionic surfactants.
Testez vos connaissances avec un QCM de 8 questions sur Fundamentals of Surfactant Chemistry.
1. According to the source, what is a defining feature of quaternary amine derivatives in surfactants?
2. How should a cosmetic formulator apply knowledge of hydrophilic and lipophilic raw materials when developing a mild cleansing product for sensitive skin?
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