表面活性剂对Cu-H2O和ZrO2-H2O纳米流体稳定性的影响∗

摘要

通过添加表面活性剂制备了 Cu-H2 O 和ZrO2-H2 O 纳米流体，研究了十二烷基苯磺酸钠、十六烷基三甲基溴化铵和辛基苯基聚氧乙烯醚等表面活性剂对Cu-H2 O 和ZrO2-H2 O 纳米流体分散稳定性的影响；并利用分子动力学方法计算出不同表面活性剂分子与Cu/ZrO2颗粒表面的相互作用能。结果发现添加表面活性剂可较大程度地提升纳米流体的稳定性，而尤以添加十二烷基苯磺酸钠的效果最为明显，计算结果也显示十二烷基苯磺酸钠分子与Cu/ZrO2间的吸附作用最强。此外，还模拟了 SDBS 与 Cu-H2 O 纳米流体中Cu颗粒的吸附行为。%Cu-H2 O and ZrO2-H2 O nanofluids were prepared with surfactants and the impacts of different surfac-tants,such as sodium dodecyl benzene sulfonate,cetyl trimethyl ammonium bromide and octyl phenyl polyoxy-ethylene ether,on the stability of Cu-H2 O and ZrO2-H2 O nanofluids was also studied.Moreover,the interac-tion energies between various surfactants and the surface of Cu/ZrO2 particles were calculated with the method of molecular dynamics simulation.It was shown that the addition of surfactants,especially for sodium dodecyl benzene sulfonate,to nanofluids would enhance the stability of the nanofluids to a large extent.Meanwhile,the result was that the adsorption between sodium dodecyl benzene sulfonate molecules and Cu/ZrO2 was strongest. Furthermore,the adsorption behavior between sodium dodecyl benzene sulfonate and Cu particles in the Cu-H2 O nanofluid was simulated as well.