Thermal conductivity carbon nanotubes

Hamilton-Crosser equation (Equation 19.3), knowing the base fluid thennalconduetivity k and the carbon nanotube thermal conductivity kp Fricke equation [31,32]... 

The effectiveness of carbon nanotubes as conductive filler to cathode of lithium ion batteries (Fig. 17) was demonstrated by adding small amounts of both carbon nanotubes and acetylene blacks to LiCoOa-based active materials [77]. The merits of using carbon nanotubes together with acetylene blacks as cathode fillers include not only the enhancement of the electrical and the thermal properties of the electrode, but also the enhancement of the density of the electrode and the shortening of the electrolyte absorption time. We envisage that the use of carbon nanotubes as multi-functional fillers will increase in both cathode and anode materials for lithium ion secondary batteries. 

Because direct calculation of thermal conductivity is difficulty 1], experimental measurements on composites with nanotubes aligned in the matrix could be a first step for addressing the thermal conductivity of carbon nanotubes. High on-axis thermal conductivities for CCVD high-temperature treated carbon fibers have been obtained, but have not reached the in-plane thermal conductivity of graphite (ref. [3], Fig. 5.11, p. 115). We expect that the radial thermal conductivity in MWNTs will be very low, perhaps even lower than the c-axis thermal conductivity of graphite. 

CNTs can enhance the thermal properties of CNT-polymer nanocomposites. The reinforcing function is closely associated with the amount and alignment of CNTs in the composites. Well-dispersed and long-term stable carbon nanotubes/ polymer composites own higher modulus and better thermal property as well as better electronic conductivity (Valter et al., 2002 Biercuk et al., 2002). Both SWNT and MWNT can improve the thermal stability and thermal conductivity of polymer, the polymer-CNT composites can be used for fabricating resistant-heat materials. 

Brown E, Hao L, Gallop JC, Macfarlane JC (2005) Ballistic thermal and electrical conductance measurements on individual multi wall carbon nanotubes. Applied Physics Letters 87 2-3. 

J. Hone, M. Whitney, C. Piskoti, A. Zettl, Thermal conductivity of single-walled carbon nanotubes, Physical Review B, 59 (1999) R2514-R2516. 

M. M. S. Fakhrabadi, A. Allahverdizadeh, V. Norouzifard, B. Dadashzadeh, Effects of boron doping on mechanical properties and thermal conductivities of carbon nanotubes., Solid State Communications, vol. 152, pp. 1973-1979, 2012. 

Z. Hana, A. Fina, Thermal conductivity of carbon nanotubes and their polymer nanocomposites A review, Progress in Polymer Science, vol. 36, p. 914-944, 2011. 

Carbon nanotubes as pseudo-one-dimensional carbon allotropes of high aspect ratio, high surface area, and excellent material properties such as ultimate electrical and thermal conductivities and mechanical strength have generated much excitement in the nanoscience and nanotechnology community.1-3 These all-carbon hollow... 

CNTs are valued for their novel properties mechanical strength, chemical inertness, electronic and thermal conductivity. Mechanical properties of CNTs, especially their extreme flexibility and strength equal to steel with one-sixth the mass, is most impressive. An excellent resistance of carbon nanotubes to bending has been observed experimentally and studied theoretically. CNTs are not nearly as strong under compression. Due to their hollow structure, they undergo buckling when placed under compressive, torsional or bending stress.16... 

Carbon electrodes — Carbon is selected for many electrochemical applications because of its good electrical and thermal conductivity, low density, adequate corrosion resistance, low thermal expansion, low elasticity, and high purity In addition, carbon materials can be produced in a variety of structures, such as powders, fibers, large blocks, thin solid and porous sheets, nanotubes, fullerenes, graphite, and diamond. Furthermore, carbon materials are readily available and are generally low-cost materials. 

Generally, the thermal stability of the composites was improved by the addition of the CNTs, which may be attributed to the following combined effects (1) the uniformly dispersed carbon nanotubes presumably provided thermo-oxidative stability to the polymers in the vicinity of the tube surfaces (2) the enhanced thermal conductivity of the composite can facilitate heat transport and thus increase its thermal stability (81) (3) it is possible that the formation of compact chars of CNTs and polymer matrix during the thermal degradation is beneficial to the improvement of thermal stability of the composites (82). 

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