Abstract

Inhibiting particles aggregation plays a crucial role in maintaining the stability of nanofluids. In this work, applying a rod electrode was developed to reduce particles aggregation and sedimentation for TiO₂-H₂O suspensions. The experimental results show that the aggregation and sedimentation of TiO₂ particles are effectively suppressed when a rod electrode is inserted into the TiO₂-H₂O suspensions due to the increase of the absolute value of particle zeta potential. There is an optimal electric voltage (0.5 kV) to achieve the maximum suppression of sedimentation, while surface flaw of the electrode is harmful to suppress sedimentation. The mechanism for inhibition of sedimentation by the electrode is speculated that the charges transfer between the electrode and the TiO₂ nanoparticles by the contact electrification. Therefore, the application of the electrode with the optimal design has great potential for improving the stability of the TiO₂-H₂O nanofluids.

摘要

抑制颗粒聚集对维持纳米流体的稳定性起着至关重要的作用。在这项工作中，开发了应用棒状电极来减少 TiO ₂ -H ₂ O 悬浮液的颗粒聚集和沉降。_{实验结果表明，当在TiO 2} -H ₂中插入棒状电极时， TiO ₂颗粒的聚集和沉降得到有效抑制。O 悬浮液由于粒子 zeta 电位的绝对值增加。存在最佳电压（0.5 kV）以实现最大抑制沉降，而电极表面缺陷不利于抑制沉降。推测电极抑制沉降的机理是通过接触带电在电极和TiO ₂纳米粒子之间转移电荷。因此，优化设计的电极的应用对于提高TiO ₂ -H ₂ O纳米流体的稳定性具有很大的潜力。