کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
686978 | 1460116 | 2012 | 6 صفحه PDF | دانلود رایگان |
For the purpose of increasing the dispersibility and thermal conductivity of fluid containing nanoparticles, raw multi-walled carbon nanotubes (MWCNTs) were treated by strong acids. The purified structures were dispersed into aqueous solution by using wet grinding conditions at various rotation speeds (300–600 rpm) merged with ultrasonication. The particle size analyzer reveals that the agglomerated size of ground particles at rotation speed of 300 rpm was 39.811 μm. Nevertheless, the agglomerated size of particles significantly decreased to 11.482 μm after grinding at rotation speed of 600 rpm. The maximum absorbance (4.0 abs at wavelength of 300 nm) and highest thermal conductivity (0.6074 W/mk at 30 °C) of the suspension corresponds to the grinding speed of 600 rpm assisted by ultrasonication dispersion. From the overall results, grinding method with high rotation speed plays can be significantly increased both the dispersibility and thermal conductivity of MWCNTs in aqueous solution.
► Purification of MWCNT removes the impurities and agglomerations of raw material.
► Grinding is effective method for reducing the agglomeration and particle size of MWCNTs.
► Dispersibility and thermal conductivity was increased with increasing the grinding speed.
Journal: Chemical Engineering and Processing: Process Intensification - Volume 61, November 2012, Pages 36–41