含碳纳米管纳米流体制备及其性能研究

Preparation of Nanofluid Containing Carbon Nanotubes and Study on Its Properties

采用强酸氧化法对碳纳米管表面进行功能化处理,之后采用机械球磨技术对其进行截断短化处理;将得到的碳纳米管分散到乙二醇、丙三醇和硅油中制备纳米流体。所制备的纳米流体具有很好的稳定性和分散性。含碳纳米管纳米流体导热性能测试结果表明,碳纳米管的直线度和长径比是影响含碳纳米管纳米流体导热性能的主要因素。通过控制球磨时间可以使碳纳米管的直线度和长径比同时达到最佳值,进而使得含碳纳米管纳米流体导热性能提升达到最大值。流变学研究结果表明,所制备的丙三醇和硅油基含碳纳米管纳米流体属于牛顿型流体。

Carbon nanotubes were functionalized by strong acid oxidation,and after functionalization the carbon nanotubes were cut into short ones by using mechanical milling technology.The obtained carbon nanobues were dispersed into ethylene glycol,glycerol,and silicone oil to prepare nanofluids.The prepared nanofluids have excellent stability and dispersity.The results of the thermal conductivity of the obtained nanofluids show that the straightness ratio and aspect ratio act great effect on the thermal conductivity enhancements of the nanofluids.The results of rheological behavior show that the glycerol based and silicone oil based nanofluid containing carbon nanotubes behave Newtonian manner.