Synthesis of low-melting-point metallic nanoparticles with an ultrasonic nanoemulsion method
Synthesis of low-melting-point metallic nanoparticles with an ultrasonic nanoemulsion method
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DOI：
10.1016/j.ultras.2010.11.015
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发表时间：
2011-05-01
期刊：
影响因子：
4.2
通讯作者：
Cumings, J.
中科院分区：
文献类型：
--
作者：
Han, Z. H.;Yang, B.;Cumings, J.
引入了一种一步、经济的纳米乳液方法来合成低熔点金属纳米颗粒。这种纳米乳液技术利用超声波搅拌产生的极高剪切速率和连续相聚 α 烯烃 (PAO) 的相对较大粘度，将熔融金属破裂至直径低于 100 nm。获得了平均直径分别为15nm和30nm的菲尔德金属纳米粒子和铟纳米粒子。纳米粒子的尺寸和形状通过透射电子显微镜（TEM）测定。使用差示扫描量热计 (DSC) 检查它们的相变行为。研究发现，这些分散在PAO中的纳米颗粒可以发生可逆的熔融-冷冻相变，并表现出较大的滞后现象。实验结果表明，纳米乳液法是大规模生产低熔点纳米粒子的可行途径。 (C) 2010 Elsevier B.V. 保留所有权利。
A one-step, economical nanoemulsion method has been introduced to synthesize low-melting-point metallic nanoparticles. This nanoemulsion technique exploits the extremely high shear rates generated by the ultrasonic agitation and the relatively large viscosity of the continuous phase - polyalphaolefin (PAO), to rupture the molten metal down to diameter below 100 nm. Field's metal nanoparticles and Indium nanoparticles of respective average diameters of 15 nm and 30 nm have been obtained. The nanoparticles size and shape are determined by transmission electron microscopy (TEM). Their phase transition behavior is examined using a differential scanning calorimeter (DSC). It is found that these nanoparticles dispersed in PAO can undergo reversible, melting-freezing phase transition, and exhibit a relatively large hysteresis. The experimental results suggest that the nanoemulsion method is a viable route for mass production of low-melting nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.