文摘
N-Dodecyl-N,N-di(2-hydroxyethyl) amine oxide (C12DHEAO) and N-stearyl-N,N-di(2-hydroxyethyl) amine oxide (C18DHEAO) were synthesized with N-alkyl-diethanolamine and hydrogen peroxide. Their chemical structures were confirmed using 1H-NMR spectra, mass spectral fragmentation and FTIR spectroscopic analysis. It was found that C12DHEAO and C18DHEAO reduced the surface tension of water to a minimum value of approximately 28.75 mN m−1 at concentration of 2.48 × 10−3 mol L−1 and 32.45 mN m−1 at concentration of 5.21 × 10−5 mol L−1, respectively. The minimum interfacial tension (IFTmin) and the dynamic interfacial tension (DIT) of oil–water system were measured. When C18DHEAO concentration was in the range of 0.1–0.5%, the IFTmin between liquid paraffin and C18DHEAO solutions all reached the ultra-low interfacial tension. Furthermore, their foam properties were investigated by Ross-Miles method, and the height of foam of C12DHEAO was 183 mm. It was also found that they showed strong emulsifying power.