双子表面活性剂修饰金纳米流体的制备及稳定性

以双子表面活性剂丁烷-1,4(N-十四烷基-N,N-二甲基)溴化铵为表面修饰剂,石油醚/正丁醇为溶剂,抗坏血酸为还原剂,在不同温度条件下一步法分别得到油基-金纳米流体和水基-金纳米流体.对纳米流体中悬浮纳米金属颗粒的形貌、粒径、光谱性质等进行了表征.结果表明,p H=7~8的冰水浴条件下制得的纳米金颗粒具有亲油性,粒径均一且分散稳定性较好.采用紫外光谱法分别考察了极性有机溶剂和热作用对油基-金纳米流体稳定性的影响.结果表明,极性有机溶剂添加量超过30%(体积分数)时,对纳米流体稳定性的影响显著;随着热处理温度的升高,纳米流体中分散的纳米金颗粒的稳定时间逐渐缩短.

Preparation and Stability of Gemini Surfactant Modified Gold Nanofluids

1,4-Bis( N-tetradecyl-N,N-dimethylammonium) propane bromide( G14-4-14) was used as surface modifying reagents for preparation of gold nanofluids in one-step with ascorbic acid as reducing agent and a mixture of petroleum ether/n-butanol as the solvent. Stable oil-or water-based nanofluids containing gold were prepared at different temperatue. The morphology, size and UV-Vis spectra of gold nanoparticles were characterized. When the pH value was 7—8 and the temperature was 0—4 ℃, the hydrophobic and uniform gold nanoparticles were prepared with good dispersity. The effects of polar organic solvents and heating temper-ature on the stability of gold nanoparticles were presented. If the amount(volume fraction) of polar solvent added was more than 30％, it had significant influence on the stability of the nanofluid. The thermally stable time of gold nanoparticles was shortened as the heating temperature increased.