Abstract: Bolaamphiphile, in which two head groups are linked by one or two hydrophobic chains,has been attracting much interest in recent years. The structures of the Langmuir films spread from two novel bolaamphiphiles containing α-naphthyl and β-naphthyl groups at the air/water interface have been investigated. Surface pressure -area isotherms,AFM and XRD measurements reveal that when spreading at the air/water surface,the molecule containing α-naphthyl forms a triple-layer Langmuir film,while the one containing β-naphthyl forms a stretched monolayer.

Key words: Bolaamphiphile, Air/water interface, Stretched monolayer