环保型Al_(2)O_(3)纳米流体的氧化稳定性和黏度特性  

Oxidation stability and viscosity properties ofenvironmentally friendly Al_(2)O_(3) nanofluids

作　　者：龚湫 吴张永[1] 朱启晨 蒋佳骏 谢志伟 GONG Qiu;WU Zhangyong;ZHU Qichen;JIANG Jiajun;XIE Zhiwei(Faculty of Mechanical and Electrical Engineering,Kunming University ofScience and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院,昆明650500

出　　处：《功能材料》2024年第9期9102-9110,共9页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51165012)。

摘　　要：玉米油作为纳米流体基液存在易氧化问题,特丁基对苯二酚的添加有望提高玉米油抗氧化性能。以玉米油作为基液,Al_(2)O_(3)作为纳米颗粒,以特丁基对苯二酚为抗氧化剂,制备新型环保型纳米流体,研究其沉降稳定性和抗氧化特性。从颗粒粒径、颗粒质量分数、抗氧化剂种类、抗氧化剂添加量等角度,研究不同时间下纳米流体的氧化产物含量与黏度。结果表明,不加入分散剂、100 mL玉米油、Al_(2)O_(3)纳米颗粒粒径为20 nm、颗粒质量分数为1.1083%,制得的纳米流体沉降稳定性最佳。添加0.7%特丁基对苯二酚的纳米流体具有最优的抗氧化性能,特丁基对苯二酚分子中存在2个酚羟基,2个酚羟基分别提供1个氢离子,在玉米油中形成稳定的醌类化合物,使得玉米油的氧化速率变缓。添加特丁基对苯二酚的含量在小于0.4%时,特丁基对苯二酚的含量不足以有效延缓油脂的氧化反应。当特丁基对苯二酚添加量超过0.7%时,仅能够小幅度的提高纳米流体的抗氧化性能,氧化诱导时间增长缓慢,相反会大幅度的增加纳米流体的黏度。制备的纳米流体具有环保、抗氧化性能好的特点,能够有效地减缓氧化物质的生成。此研究有助于环保型纳米流体抗氧化研究的进一步发展。Corn oil as a nanofluid base fluid has the problem of easy oxidation,and the addition of tertiary butylhydroquinone is expected to improve the antioxidant property of corn oil.In this paper,a new environmentally friendly nanofluid was prepared by using corn oil as a base fluid,Al_(2)O_(3)as nanoparticles,and tertiary butylhydroquinone as an antioxidant to study its settlement stability and antioxidant properties.The content of oxidation products and viscosity of the nanofluids at different times were investigated from the perspectives of particle size,particle mass fraction,antioxidant type,and antioxidant addition.The results showed that the nanofluids produced without surfactant,100 mL of corn oil,Al_(2)O_(3)nanoparticles with a particle size of 20 nm and a particle mass fraction of 1.1083%had the best sedimentation stability.The nanofluid with 0.7%of tertiary butylhydroquinone added had the optimum antioxidant properties.There are two phenolic hydroxyl groups in the molecule of tertiary butylhydroquinone,and each of the two phenolic hydroxyl groups provides one hydrogen ion,which forms stable quinone compounds in corn oil,making the oxidation rate of the corn oil slower.When the content of tertiary butylhydroquinone was added at less than 0.4%,the content of tertiary butylhydroquinone was not enough to effectively retard the oxidation reaction of the oil.When the addition of tertiary butylhydroquinone exceeded 0.7%,the antioxidant property of the nanofluid could only be improved slightly,and the oxidation induction time increased slowly,but on the contrary,the viscosity of the nanofluid would be increased greatly.The nanofluid prepared in this paper has the characteristics of environmental friendly and good antioxidant performance,which can effectively slow down the generation of oxidised substances.This study contributes to the further development of antioxidant research of environmentally friendly nanofluids.

关 键 词：环保型纳米流体 抗氧化特性 沉降稳定性 抗氧化剂 酚羟基 黏度 

分 类 号：TB34[一般工业技术—材料科学与工程]