改性油基TiO_(2)纳米流体的稳定性优化  

Stability Optimization of Modified Oil-based TiO_(2)Nanofluids

作　　者：赵德凡 董天恒 郑晨明 刁珂龙 杨谋存[1] Zhao Defan;Dong Tianheng;Zheng Chenming;Diao Kelong;Yang Moucun(Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学,江苏南京211816

出　　处：《广东化工》2024年第13期12-16,共5页Guangdong Chemical Industry

基　　金：国家级大学生创新创业训练计划项目(202210291051Z)。

摘　　要：为了制备出具有高稳定性的TiO_(2)/油纳米流体,通过控制改性剂种类、改性剂用量、改性温度三个变量设计了正交实验来探究改性TiO_(2)纳米颗粒的最佳方案。在9组正交实验中,吸光度结果表明,在50℃条件下使用2mL十六烷基三甲氧基硅烷改性TiO_(2)纳米颗粒,制备出的纳米流体具有最好的稳定性,在室温条件下放置10周后依旧能够保持稳定。通过接触角测试发现,该方法制备出的TiO_(2)纳米颗粒与去离子水之间的表面接触角从12.4°增加到143.3°,具有极强的疏水亲油性,有利于TiO_(2)纳米颗粒在导热油中的分散。此外,对正交实验结果进行分析,得出:最佳改性剂剂量为1mL,最佳改性剂种类为十六烷基三甲氧基硅烷,最佳改性温度为50℃。改性剂种类对纳米流体稳定性结果的影响最大,改性剂剂量对纳米流体稳定性的影响最小。To prepare TiO_(2)/oil nanofluids with high stability,orthogonal experiments were designed to investigate the best solution for modifying TiO_(2)nanoparticles by controlling three variables:modifier type,modifier amount,and modification temperature.In nine sets of orthogonal experiments,the absorbance results showed that the nanofluids prepared by modifying TiO_(2)nanoparticles with 2 mL of hexadecyl trimethoxysilane at 50℃had the best stability,and remained stable after 10 weeks at room temperature.The surface contact angle between the TiO_(2)nanoparticles prepared by this method and deionized water was found to increase from 12.4°to 143.3°by contact angle test,which has excellent hydrophobic and lipophilic properties,facilitating the dispersion of TiO_(2)nanoparticles in heat transfer oil.In addition,the results of the orthogonal experiments were analyzed,and it was concluded that the optimal modifier dose was 1 mL,the optimal modifier type was hexadecyl trimethoxysilane,and the optimal modification temperature was 50℃.The modifier type had the greatest effect on the nanofluid stabilization results,and the modifier dose had the least effect on the nanofluid stability.

关 键 词：十六烷基三甲氧基硅烷 KH550 KH570 稳定性 TiO_(2)纳米流体 表面化学改性 

分 类 号：TB383[一般工业技术—材料科学与工程]