Synthesis, characterization, and surface properties of amide amine oxides based on natural vegetable oil

ABSTRACT

Two types of novel amine oxide surfactants, castor oil amide amine oxide and cottonseed oil amide amine oxide, have been successfully synthesized via a two-step synthetic route with mild reaction conditions, the chemical structures of which were confirmed by mass spectra (MS) and FTIR spectra. Their surface activities have been measured. The results show that these synthesized amide amine oxide surfactants reduced the surface tension of water to a minimum value of approximately 32.48 mN/m at a concentration of 5.06 × 10⁻⁵ mol/L. It was also found that these novel amide amine oxide surfactants exhibited strong emulsifying power.

GRAPHICAL ABSTRACT

KEYWORDS:

• Amide amine oxide
• emulsification ability
• natural vegetable oil
• surface activities