Thermal Conductivity Resources

Top 10 High Thermal Conductivity Research Papers

  1. Thermal conductivity enhancement of Ag nanowires on an organic phase change material

    Increasing the thermal conductivity of an organic phase change material, all the while maintaining a high phase change enthalpy, is a difficult task. In this study, researchers took 1-tetradecanol/Ag nanowires composites, containing various wt% of Ag nanowires, and tested their thermal conductivities and phase change enthalpies. The results suggest the PCM composite containing 62.73 wt% of Ag nanowires is the most promising candidate for thermal conductivity enhancement of organic phase change materials, as it showed a remarkably high thermal conductivity of 1.46 W/mK, while still maintaining a reasonably high phase change enthalpy of 76.5 J/g. Researchers deemed this behaviour possible as fewer thermal conduct interfaces are present, alongside a high aspect ratio of Ag nanowires.

  2. Thermal conductive PS/graphite composites

    Polystyrene (PS)/graphite thermal conductive nano-composites were prepared to verify the high thermal conductivity values with the addition of graphite, as well as the layered structure. The thermal conductivity of PS improved greatly in the presence of the graphite. Researchers used the Maxwell-Eucken model and the Agari model to evaluate thermal conductivity. For the purpose of improving the interfacial compatibility of PS/graphite, three PS fabrication methods were introduced to determine any differences among morphologies, thermal conductivities and mechanical properties of the composite. By fabricating the composite via pan milling intercalation, it was determined that this method resulted in a much higher thermal conductivity value, than any other.

  3. A nano-graphite/paraffin phase change material with high thermal conductivity

    Nano-graphite (NG)/paraffin composites were prepared as composite phase change materials. The addition of NG increased the thermal conductivity of the composite material. The material containing 10% NG had a thermal conductivity of 0.9362 W/mK

  4. Heat Transfer Organic Materials: Robust Polymer Films with the Outstanding Thermal Conductivity Fabricated by the Photopolymerization of Uniaxially Oriented Reactive Discogens

    Triphenylene-based reactive discotic liquid crystals (DLC), HABET vinyl monomer and THBT thiol cross-linker, were synthesized and applied for the development of advanced heat transfer organic material (HTOM) as a continuous matrix. The thermal conductivity values of the polymerized DLC HTOMs was evaluated using the transient plane source (TPS) technique and laser flash analysis (LFA). The DLC HTOMs that were reported to have high thermal conductivity values and excellent mechanical and chemical stabilities can be used as heat dissipating materials in the electronic, automobile, and display industries.

  5. Thermal conductivity and mechanical properties of aluminum nitride filled linear low-density polyethylene composites

    The objective of this study was to create polymer composites with high thermal conductivity and mechanical properties. To acquire these, aluminum nitride microparticles were modified with a titanate coupling reagent of isopropyltrioleictitanate, and blended via a power-mixing method into linear low-density polyethylene. Using the Hot Disc thermal constants analyzer, the thermal conductivity of the composite was measured. The results concluded that the addition of aluminum nitride particles to the composite enhanced the thermal conductivity, as well as mechanical properties significantly.

  6. A Study of Thermal Conductivity of Boron-Nitride Epoxy-Matrix Composites

    Thermal conductivity of neat-epoxy resin is one of the lowest among all known solid materials. A common method of increasing thermal conductivity is through the addition of filler particles with high thermal conductivity. In this study, epoxy resin composites were studied to assess the possibility of increasing thermal conductivity for effective heat dissipation. A typical industrial liquid epoxy was used with commercial boron nitride powders PT100 and PTX25 as fillers. Epoxy resin samples were filled with powder at 5%, 10%, 15%, 20%, 25%, and 30% by volume fraction. Thermal conductivity was measured with the Hot Disc Thermal Constant Analyser TPS 500, and it was observed that thermal conductivity increased with filler content.

  7. The design of a ceramic phosphor plate with functional materials for application in high power LEDs

    Lutetium aluminum garnet activated by cerium (LuAG:Ce) materials containing functional materials (SiO2 and MgO) were prepared. These materials are used in LEDs, and they require a high thermal conductivity in order to minimize thermal aging. The functional materials were added in order to increase the thermal conductivity, as well as the luminescent properties of these materials. It was found that SiO2 did not improve the luminescent properties, but MgO did enhance these properties. The materials containing MgO were found to maintain their properties better than the others. The authors state that MgO could be a useful additive in next-generation high-power LEDs.

  8. Thermal transport of oil and polymer composites filled with carbon nanotubes

    Carbon nanotubes (CNTs) have extremely high thermal conductivity and can raise the thermal conductivity of a polymer matrix when used as an additive. Previous research has shown that random CNT orientation in polymer matrices gives a much lower thermal conductivity value than a specific alignment direction. This project tested the thermal conductivity of oils and polymers with the addition of CNTs using the Hot Disc TPS 2500S. Results were encouraging, with the thermal conductivity of the composites increasing linearly with the amount of CNTs added. A spontaneous alignment of the CNTs in liquid crystal polymer matrix caused a large increase in thermal diffusivity. The researchers concluded that CNTs are an effective filler for use in increasing the thermal conductivity of composites and improving their thermal performance.

  9. A review on thermally conductive polymeric composites: classification, measurement, model and equations, mechanism and fabrication methods

    This article explored polymeric composites and their thermal characteristics, such as their high thermal conductivity and excellent thermal stability. These characteristics are highly desired as they can be widely applied in the electronics, medical, manufacturing, etc., industries. The thermal conductivities were studied using a variety of sources, including the transient plane source (TPS)/Hot Disc method. After conducting several studies on the thermally conductive polymeric composites, it was determined that there were some key scientific problems and technical difficulties that need to be solved, and further investigations must be conducted on their use.

  10. Novel slurry containing graphene oxide-grafted microencapsulated phase change material with enhanced thermo-physical properties and photo-thermal performance

    This paper focuses on the creation of a new composite phase change material, paraffin-silica (SiO2)/graphene oxide (GO) through a two step process for potential use as a heat transfer fluid in direct absorption solar collectors. The resulting composite is composed of spherical capsules, and has the GO embedded within the SiO2 shell. Thermal conductivity testing with the Hot Disc TPS 2500 S revealed that the composites had excellent thermal characteristics and stability. A phase change slurry created through dispersal of the composite in water had high thermal conductivity and heat capacity, in addition to photo-thermal conversion capacities. The authors suggest that this could be a good potential solar energy storage material for solar collectors.