Preparation and stability of zinc ferrite nano-particle suspension of ammonia-water solution  

铁酸锌-氨水纳米流体的制备及稳定性(英文)

作　　者：杨柳[1] 杜垲[1] 张小松[1] 牛晓峰[1,2] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]香港理工大学屋宇设备工程学系

出　　处：《Journal of Southeast University(English Edition)》2010年第2期368-371,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.50876020)

摘　　要：In order to apply nano-particles to the ammonia-water absorption refrigeration, the zinc ferrite nano-particles suspension of ammonia-water solution with the mixed surfactants of sodium dodecyl benzene sulfonate （SDBS） and cetyl trimethyl ammonium bromide （CTAB） is prepared. A series of experiments is performed to investigate the stability of the prepared nanofluid with different contents and proportions of surfactants, different durations of ultrasonic wave vibration and different durations of illumination. The optimal dispersion conditions are 1.5% SDBS, 0. 015% CTAB（mass fraction）, 30 min of ultrasonic vibration and over 72 h of illumination. Finally, based on double electrode layer theory, the influences of the content of the surfactants on the stability of nanofluid are analyzed. The existence of the optimal surfactant content is proved, which is in accordance with the experimental results.为了将纳米颗粒的强化传热吸收作用应用于氨水吸收制冷中,提出了在氨水溶液中添加铁酸锌纳米颗粒和复配阴/阳离子表面活性剂SDBS和CTAB的纳米流体的配制方法,并对其稳定性进行了实验研究.研究了阴阳离子活性剂质量分数、复配比例及超声分散和光照对稳定性的影响,确定了铁酸锌-氨水纳米流体分散的最佳工艺为:SDBS质量分数为1.5%,CTAB质量分数为0.015%,超声时间为30min,光照时间72h以上.最后根据双电层原理分析了活性剂质量分数对悬浮液稳定性的影响,表明存在最佳活性剂质量分数,并与实验结果相符.

关 键 词：NANOFLUID STABILITY SURFACTANT ammonia water 

分 类 号：TB611[一般工业技术—制冷工程]