纳米复合磁流变液制备与流变特性研究  

Preparation and rheological properties of nano-composite magnetorheological fluids

作　　者：朱启晨 吴张永[2] 蒋佳骏 ZHU Qichen;WU Zhangyong;JIANG Jiajun(Automotive College,Yunnan Vocational College of Transportation,Kunming 650300,China;Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]云南交通运输职业学院汽车学院,昆明650300 [2]昆明理工大学机电工程学院,昆明650500

出　　处：《功能材料》2024年第10期10112-10120,共9页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51165012)。

摘　　要：利用纳米磁流体作为磁流变液的基础载液是提高磁流变效应的有效手段。然而,高稳定纳米复合磁流变液的制备仍然是一大难题,包括纳米磁流体的制备与复合颗粒的团聚问题。研究以硅烷偶联剂KH550为分散剂,制备了Fe_(3)O_(4)硅油基纳米磁流体,并通过分散剂共包覆工艺得到了新型纳米复合磁流变液。利用XRD、FI-IR、TEM、FE-SEM、VSM等手段对表面形貌、物相构成和磁性能进行了表征分析。研究了新型纳米复合磁流变液沉降稳定性和再分散性。结果表明,微米级颗粒的表面改性明显改善了纳米复合磁流变液的稳定性与再分散性,当纳米颗粒体积分数为8%时,沉降稳定性和再分散性达到最佳;新型纳米复合磁流变液表现出更佳的耐温性能,可在-40~120℃的温度范围内长期稳定。研究了新型纳米复合磁流变液的流变特性。结果表明,与传统磁流变液相比,纳米复合磁流变液表现出更高的离态粘度和磁流变效应,静态屈服应力和动态屈服应力均随纳米颗粒浓度和磁场强度的增大而增大。The utilization of magnetic nanofluids as the base carrier fluid of magnetorheological fluids represents an effective approach to enhance the magnetorheological effect.However,achieving highly stable nano-composite magnetorheological fluids remains a significant challenge,encompassing both the synthesis of magnetic nanofluids and the prevention of composite particle agglomeration.In this study,Fe_(3)O_(4)silicone oil-based magnetic nanofluids were prepared using silane coupling agent KH550 as a dispersant,followed by a novel process of co-coating dispersants to obtain nano-composite magnetorheological fluids.The surface morphology,physical phase composition and magnetic properties were characterized and analyzed using XRD,FI-IR,TEM,FE-SEM and VSM.The sedimentation stability and redispersibility of the novel nano-composite magnetorheological fluids were investigated.The results show that surface modification of micron-sized particles significantly enhances the stability and redispersibility of the nano-composite magnetorheological fluids,with optimal sedimentation stability and redispersibility observed at nanoparticle volume fraction of 8%.Furthermore,the novel nano-composite magnetorheological fluids demonstrate superior temperature resistance,remaining stable within the temperature range form-40℃to 120℃over extended durations.Rheological properties of novel nano-composite magnetorheological fluid were also investigated demonstrating higher off-state viscosity and magnetorheological effect in comparison to conventional magnetorheological fluids.Moreover,both static and dynamic yield stresses increase with nanoparticle concentration and magnetic field strength.

关 键 词：磁流变液 纳米磁流体 稳定性 再分散性 流变特性 

分 类 号：TB34[一般工业技术—材料科学与工程]