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A new kind of amine oxide surfactant -cocotriethoxylpropanediamine oxide (CTPDAO) -was synthesized by a two-step process. The molecular structure was characterized by FTIR spectra and 1 H NMR. The new surfactant showed high surface activity in aqueous solution in the surface tension measurement. Emulsifying capacity and wetting ability were studied in comparison to dodecyldimethylamine oxide (DDMAO). The results indicate that this new surfactant could reach the lowest surface tension of 30.4 mN m À 1 in aqueous solution with a critical micelle concentration (CMC) of 0.23 mmol L À 1 . The wetting ability of DDMAO is better than that of CTPDAO. Compared with CTPDAO, DDMAO shows a greater capacity to emulsify soybean oil, although CTPDAO is a better emulsifying agent for liquid paraffin. The foaming properties and thickening function of DDMAO and CTPDAO mixed with alcohol ether sulfate (AES) and dodecylbenzene sulfonate (LAS) were also investigated. The results show that CTPDAO is a superior foam stabilizer than DDMAO while CTPDAO and DDMAO both have excellent thickening functions. GRAPHICAL ABSTRACT ARTICLE HISTORY