Shape-controlled synthesis of silver nanostructures for high-thermal conductivity nanofluids

机译：用于高导热纳米流体的银纳米结构的形状控制合成

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A nanofluid is a solid-liquid composite material consisting of a stable suspension of nanometric particles in a conventional refrigerant liquid expected to exhibit enhanced heat transfer properties. Elemental silver (Ag) was selected in this research because of its high electrical and thermal conductivity that are likely to be dependent on the crystal size and shape at the nanoscale. Accordingly, we have synthesized highly monodisperse silver nanowires and nanocrystals by reducing silver nitrate solutions with ethylerie glycol in presence of polyvinylpyrrolidone, (PVP). The shape-control in the silver nanostructures was achieved by a proper selection of the type and level of chloride salts, e.g. KCl and CaCl_2, and specific PVP/Ag mole ratios in starting solutions. The development of the metal phase was confirmed by X-ray diffractometry. Transmission electron microscopy analyses evidenced the formation of silver nanowires exhibiting a very uniform thickness that could be tuned in the 40-130nm range. UV-vis measurements evidenced the plasmon peak at ～387nm and clear shoulders at ～357nm that are indicative of the formation of elongated nanostructures.

机译：纳米流体是一种固液复合材料，由纳米颗粒在常规制冷剂液体中的稳定悬浮液组成，有望表现出增强的传热性能。在本研究中选择元素银（Ag）是因为其高的电导率和热导率可能取决于纳米级的晶体尺寸和形状。因此，我们通过在聚乙烯吡咯烷酮（PVP）存在下用乙基乙二醇还原硝酸银溶液来合成高度单分散的银纳米线和纳米晶体。银纳米结构中的形状控制是通过适当选择氯化物盐的类型和含量来实现的。起始溶液中的KCl和CaCl_2以及特定的PVP / Ag摩尔比。通过X射线衍射法证实了金属相的发展。透射电子显微镜分析表明银纳米线的形成具有非常均匀的厚度，可以在40-130nm范围内进行调整。紫外可见测量表明，等离激元峰在〜387nm处出现，并在〜357nm处出现清晰的肩峰，这表明形成了细长的纳米结构。

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《Nanowires and nanotubes - synthesis, properties, devices and energy applications of one-dimensional materials》|2012年|33-38|共6页
会议地点 San Francisco CA(US);San Francisco CA(US);San Francisco CA(US)
作者
Glorimar Garcia; Oscar Perales-Perez; Majid Ahmadi; Maxime J-F Guinel;
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University of Puerto Rico, Department of Mechanical Engineering, P.O. Box 9045, Mayagueez, P.R. 00681-9045;

University of Puerto Rico, Department of Mechanical Engineering, P.O. Box 9045, Mayagueez, P.R. 00681-9045;

University of Puerto Rico, Department of Physics, P.O. Box 70377, San Juan, P.R. 00936-8377;

University of Puerto Rico, Department of Physics, P.O. Box 70377, San Juan, P.R. 00936-8377;

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1. Shape-Controlled Synthesis of Metal Nanostructures:The Case of Silver [J] . Benjamin Wiley, Yugang Sun, Brian Mayers, Chemistry: A European journal . 2005,第2期

机译：金属纳米结构的形状控制合成：以银为例
2. Shape-Controlled Synthesis of Silver and Gold Nanostructures [J] . Benjamin Wiley, Yugang Sun, Jingyi Chen, MRS bulletin . 2005,第5期

机译：银和金纳米结构的形状控制合成
3. Shape-controlled synthesis of silver nanostructures [J] . Jialin Sun, Jianhong Zhang, Wei Liu Nanotechnology . 2005,第10期

机译：银纳米结构的形状控制合成
4. Shape-controlled synthesis of silver nanostructures for high-thermal conductivity nanofluids [C] . Glorimar Garcia, Oscar Perales-Perez, Majid Ahmadi, Materials Research Society Symposium N on One-Dimensional Nanostructured Materials for Energy Conversion and Storage . 2012

机译：高热导纳流体的形状控制的银纳米结构合成
5. The electrochemical synthesis, chemical synthesis, and galvanic exchange of silver nanostructures directly on surfaces. [D] . Slawinski, Grzegorz W. 2010

机译：银纳米结构的电化学合成，化学合成和电流交换直接在表面上。
6. Shape-Controlled Synthesis of Copper Indium Sulfide Nanostructures: Flowers Platelets and Spheres [O] . Jiajia Ning, Stephen V. Kershaw, Andrey L. Rogach 2019

机译：形状控制的硫化铜铟纳米结构的合成：花血小板和球
7. Cover Picture: Shape-Controlled Synthesis of Metal Nanostructures: The Case of Silver (Chem. Eur. J. 2/2005) [O] . Benjamin Wiley, Yugang Sun, Brian Mayers, 2005

机译：封面图片：金属纳米结构的形状控制合成：银色（Chem.EUR。J.2 / 2005）

Shape-controlled synthesis of silver nanostructures for high-thermal conductivity nanofluids

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