醇醚糖苷与纳米膨润土颗粒稳定乳状液的协同作用

以表面活性剂醇醚糖苷(AEG)和纳米膨润土颗粒(NPT-2)为乳化剂,制备了油酸甲酯乳状液,考察了AEG与NPT-2的配比对乳液体系稳定性和乳液粒径的影响,并通过表面张力和zeta电位测量对二者复配稳定乳液的机理进行了讨论。结果表明,单一使用表面活性剂AEG或者纳米膨润土颗粒NPT-2均不能得到稳定的油酸甲酯乳状液,将二者复配则乳液的稳定性有显著提高。固定AEG量逐渐增加NPT-2乳液粒径先增大后又减小,固定NPT-2量逐渐增加AEG,乳液体系粒径逐渐变小;AEG与NPT-2复配前后体系的表面张力曲线"滞后"现象及zeta电位的升高表明,AEG分子在纳米颗粒NPT-2上发生了吸附,协同稳定乳状液。

Synergetic Effect between Alkylethoxyglucoside and Bentonite Nanoparticles for Stabiling Emulsions

The methyl oleate emulsion was prepared using alkylethoxyglucoside(AEG) surfactant and bentonite nanoparticles(NPT-2) as emulsifiers.The effects of the ratio of AEG to NPT-2 on the stability and diameter of the emulsive droplet were discussed in detail.The synergetic stability mechanism of the two compounds was investigated by means of surface tension and zeta potential measurement.The results showed that methyl oleate emulsion couldn′t be stabled by either alkylethoxyglucoside(AEG) or bentonite nanoparticles(NPT-2) alone.At fixed amount of AEG,the diameter of the emulsive droplet increased first and then decreased with increasing NPT-2.However,at fixed the amount of NPT-2,the diameter of the emulsive droplet decreased as increasing the amount of AEG.The "lag" of the surface tension curve and the increased value of the zeta potential indicated that the molecules of AEG were adsorbed onto the NPT-2 nanoparticles to stabilize the emusion synergetically.