肉豆蔻酰基氨基酸表面活性剂泡沫性能及其离子特异性效应

Foam properties and ionic specific effects of myristoyl amino acid surfactants

摘要:

采用吊片法和鼓气法分别考察了肉豆蔻酰基β-丙氨酸盐和肉豆蔻酰基牛磺酸盐的表面张力和泡沫性能，并研究添加无机盐和有机铵盐对肉豆蔻酰基β-丙氨酸（MAS）与肉豆蔻酰基牛磺酸钠（MTS）泡沫性能的影响。结果表明：两类表面活性剂的临界胶束浓度（CMC）与反离子类型相关，肉豆蔻酰基牛磺酸钾的起泡性弱于钠盐但稳定性高于钠盐；除四丁基溴化铵（TBAB）外，盐的添加均可显著提升两种表面活性剂的稳泡性，而对起泡性的影响不明显；添加阳离子对两种表面活性剂的泡沫性能的影响与其亲水基类型相关，MTS/盐体系的离子特异性效应比MAS/盐体系更为显著，其稳泡性在添加钾离子时达到峰值，而MTS/TBAB的消泡性能最为显著。

Abstract:

The surface tensions and foam properties of myristoyl β-alanine and myristoyl taurine were studied by using Wilhelmy plate method and Foam scan, respectively. The effects of inorganic and tetraalkylammonium salts on the foam properties of myristoyl β-alanine sodium (MAS) and myristoyl taurine sodium (MTS) were characterized. The results showed that: first, the critical micelle concentration (CMC) of myristoyl β-alanine potassium is higher than myristoyl β-alanine sodium, whereas the order is reversed for myristoyl taurine salts with sodium and potassium as the counterion; The counterion effects on the foam properties of myristoyl β-alanine were not obvious; The foamability of myristoyl taurine potassium was weaker than that of sodium salt, but the foam stability was higher than that of sodium salt. The added salt (except TBAB) can significantly enhance the foam stability of both MAS and MTS. The ion specific effects on the foam properties is related to headgroup types. The ion specific effect of MTS/salt system is stronger than that of MAS/salt system, and the foam stability reaches the peak value with added potassium ions, while the defoaming property of MTS/TBAB is the most significant.