采用化学沉淀法制备的纳米金分散水基纳米流体的热物理性能测量。

Thermo-physical property measurement of nano-gold dispersed water based nanofluids prepared by chemical precipitation technique.

机构信息

Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, WB 721 302, India.

出版信息

J Colloid Interface Sci. 2010 Sep 1;349(1):434-7. doi: 10.1016/j.jcis.2010.05.086. Epub 2010 Jun 1.

DOI:10.1016/j.jcis.2010.05.086

PMID:20609848

Abstract

Nano-gold dispersed water based nanofluid has been prepared following the chemical reduction method. Crystallite size, particle size/shape/morphology, and purity of the nanoparticles have been characterized using X-ray diffraction, scanning and transmission electron microscopy and energy dispersion spectroscopy, respectively. The degree of thermal conductivity enhancement of the nanofluid (with respect to the base fluid) as a function of concentration and size of gold nanoparticle has been determined using the transient hot-wire technique. The degree of enhancement increases with increase in concentration and decrease in size of nanoparticles. The maximum enhancement recorded is approximately 48% at 0.00026 vol.% concentration and 21nm average particle size.

摘要

纳米金分散水基纳米流体是通过化学还原法制备的。分别采用 X 射线衍射、扫描电子显微镜和透射电子显微镜及能量色散谱对纳米粒子的晶粒度、粒径/形状/形貌和纯度进行了表征。采用瞬态热线技术测定了纳米流体（相对于基液）的导热系数增强程度随金纳米粒子浓度和尺寸的变化。增强程度随浓度的增加和纳米粒子尺寸的减小而增加。在 0.00026 体积%的浓度和 21nm 的平均粒径下，记录到的最大增强约为 48%。