Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2018-08-23 , DOI: 10.1016/j.jeurceramsoc.2018.08.035 Wenlong Huo , Xiaoyan Zhang , Ke Gan , Yugu Chen , Jie Xu , Jinlong Yang
We reveal that zeta potential has a notable effect on properties of foamed suspension, which remains poorly explored. It is demonstrated low zeta potential is beneficial for foam stability, and the experimental results show that absolute value of zeta potential of 30–40 mV is the boundary between stable foams and unstable foams. High zeta potential above 40 mV gives rise to instability of foamed colloidal suspension, owing to strong interparticle repulsion force that prevents particles from forming a closely packed particle network at liquid/air interfaces. Besides, it is found that high zeta potential leads to low foamability of foamed colloidal suspension. It is also demonstrated herein that stable and uniform foams with thin and homogeneous-thickness wall without agglomerates can be prepared at the isoelectric point (IEP) using long-chain surfactant, which generates weak agglomerated particles that can be re-separated to monodisperse particles due to the steric hindrance effect of surfactant.
中文翻译:
ζ电位对泡沫胶体悬浮液性能的影响
我们发现,ζ电位对泡沫悬浮液的性能有显着影响,而泡沫悬浮液的探索性仍然很差。事实证明,较低的zeta电位有利于泡沫的稳定性,实验结果表明,zeta电位的绝对值在30–40 mV之间是稳定泡沫和不稳定泡沫之间的边界。高于40 mV的高zeta电势会导致发泡胶体悬浮液的不稳定性,这是因为强大的粒子间排斥力阻止了粒子在液体/空气界面形成紧密堆积的粒子网络。此外,发现高的ζ电位导致发泡的胶体悬浮液的低发泡性。