Effect of Morphology of Carbon Nanotubes on Thermal Conductivity Enhancement of Nanofluids

2007 ◽  
Vol 21 (3) ◽  
pp. 451-459 ◽  
Author(s):  
Bong Hun Kim ◽  
G. P. Peterson
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Thermal Conductivity Enhancement ◽  
Conductivity Enhancement

Thermal Transport Properties of Nanofluids Containing Carbon Nanotubes

2008 ◽  
Author(s):  
Huaqing Xie ◽  
Lifei Chen ◽  
Yang Li ◽  
Wei Yu
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Base Fluid ◽  
Volume Fraction ◽  
Thermal Conductivity Enhancement ◽  
Mechanochemical Reaction ◽  
Multiwalled Carbon ◽  
Conductivity Enhancement ◽  
Lower Viscosity ◽  
Potential Applications

Multiwalled carbon nanotubes (CNTs) have been treated by using a mechanochemical reaction method to enhance their dispersibility for producing CNT nanofluids. The thermal conductivity was measured by a short hot wire technique and the viscosity was measured by a rotary viscometer. The thermal conductivity enhancement reaches up to 17.5% at a volume fraction of 0.01 for an ethylene glycol based nanofluid. Temperature variation was shown to have no obvious effects on the thermal conductivity enhancement for the as prepared nanofluids. With an increase in the thermal conductivity of the base fluid, the thermal conductivity enhancement of a nanofluid decreases. At low volume fractions (<0.4 Vol%), nanofluids have lower viscosity than the corresponding base fluid due to lubricative effect of nanoparticles. When the volume fraction is higher than 0.4 Vol%, the viscosity increases with nanoparticle loadings. The prepared nanofluids, with no contamination to medium, good fluidity, stability, and high thermal conductivity, would have potential applications as coolants in advanced thermal systems.

scholarly journals Thermal Conductivity Enhancement Derived from Poly(Methyl Methacrylate)-Grafted Carbon Nanotubes in Poly(Methyl Methacrylate)/Polystyrene Blends

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1347 ◽  
Author(s):  
Jaehyun Wie ◽  
Jooheon Kim
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Methyl Methacrylate ◽  
Multiwalled Carbon Nanotubes ◽  
Thermal Conductivity Enhancement ◽  
Multiwalled Carbon ◽  
Poly Methyl Methacrylate ◽  
Conductivity Enhancement ◽  
Conductive Properties ◽  
Enhanced Thermal Conductivity

This paper presents a method to enhance thermal conductivity using poly(methyl methacrylate)(PMMA), polystyrene(PS) blends, and incorporation of multiwalled carbon nanotubes (MWCNTs). MWCNTs are selectively localized in PMMA phase to improve conductive properties. In addition, Surface of MWCNTs was treated with PMMA to enhance affinity between matrix and filler. PMMA grafting helps filler localization on matrix phase. Composites using two polymers enhanced thermal conductivity by ~11% compared with composites using only PS or PMMA. Also, PMMA grafting on the surface of MWCNTs enhanced thermal conductivity by ~13% compared with samples without PMMA grafting.

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