高等学校化学学报

高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (2): 414.doi: 10.7503/cjcu20120501

• 物理化学 • 上一篇    下一篇

油基-金纳米流体的制备及热稳定性

李丹1, 池海2, 方文军2   

  1. 1. 潍坊学院化学化工与环境工程学院, 潍坊 261061;
    2. 浙江大学化学系, 杭州 310027
  • 收稿日期:2012-05-25 出版日期:2013-02-10 发布日期:2013-01-21
  • 通讯作者: 方文军,男,博士,教授,主要从事航空航天推进剂化学研究.E-mail:fwjun@zju.edu.cn;李丹,女,博士,讲师,主要从事纳米流体研究.E-mail:danli830109@163.com E-mail:fwjun@zju.edu.cn;danli830109@163.com
  • 基金资助:

    国家自然科学基金(批准号: 21103129, 20973154)和山东省高等学校科技计划项目(批准号: J12LD58)资助.

Preparation and Thermal Stability of Oil-based Au Nanofluids

LI Dan1, CHI Hai2, FANG Wen-Jun2   

  1. 1. Chemistry & Chemical and Environmental Engineering College, Weifang University, Weifang 261061, China;
    2. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
  • Received:2012-05-25 Online:2013-02-10 Published:2013-01-21

PDF (PC)

被引次数

17

摘要：

分别采用N-十六烷基-N-(羟乙基)-N,N-二甲基溴化铵(CHDAB)和丁烷-1,4-二(N-十六烷基-N,N-二甲基溴化铵)(G16-4-16)2种阳离子表面活性剂作为金属表面修饰剂, 在石油醚/正丁醇/水混合体系中用KBH4 还原HAuCl4制备出亲油性纳米金. 其中, 双子表面活性剂G16-4-16显示出更好的包裹分散作用, 其包裹的纳米金粒径分布范围较窄, 平均粒径为5.2 nm. 将该纳米金颗粒分散在液态烷烃、 甲苯和长链烷基醇等溶剂中可制成稳定的油基纳米流体. 采用紫外-可见光谱法跟踪热稳定性随时间的变化, 结果表明, 该纳米流体显示了较好的热稳定性, 在130 ℃稳定时间达20 h. 采用点热源法测定了该纳米流体的导热系数, 结果表明, 50 ℃时添加质量分数1.5%的纳米金可以使其导热系数增大约17%.

关键词: 纳米流体, 纳米金, 双子表面活性剂, 热稳定性

Abstract:

Two cationic surfactants, N-cetyl-N-(hydroxyethyl)-N,N-dimethyl ammonium bromide(CHDAB) and 1,4-bis(cetyldimethylammonium) propane dibromide(G16-4-16), were used as surface-modified reagents for preparation of hydrophobic gold nanoparticles from reduction of HAuCl4 with KBH4 in mixture of petroleum ether/n-butanol/H2O. The results show that gemini surfactant G16-4-16 is better for coating and dispersing, and the gold nanoparticles coated by the gemini surfactant G16-4-16 have a narrow size distribution with an average diameter of 5.2 nm. Stable nanofluids containing gold nanoparticles with hydrocarbon(toluene) as base liquids were prepared. The thermal stability of the nanofluids as a function of time was monitored using UV-Vis absorption method. It is shown that the gold nanofluid has good thermal stability, which has a stable time of 20 h at 130 ℃. The thermal conductivity of the gold nanofluids was performed by point heat source method. The enhancements of thermal conductivity of the gold nanofluids containing 1.5%(mass fraction) gold nanoparticles can reach 17%.

Key words: Nanofluid, Nano gold, Gemini surfactant, Thermal stability

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