The results showed that their surface tension decreased with an increasing alkyl chain length(n) at the 1-position of the cation. The values of surface tension covered a relatively wide range from 48.0 mJ/m2(PF6) to 35.7 mJ/m2(PF6).

• 采用Wilhelmy白金板法在室温25℃测定了离子液体的表面张力；随着1位氮上取代基碳链的增长；表面张力从[C4mim]PF6的48.；0 mJ/m2逐渐下降到[C7mim]PF6的35