High and tuneable anisotropic thermal conductivity controls the temperature distribution of 3D printed all-polyethylene objects

Abstract

With ongoing miniaturization and weight reduction of portable electronic devices, effective heat dissipation is essential to inhibit malfunctions and premature failure. The application of fillers in a polymer matrix enhances...

Ultrahigh Thermal Conductivity of Epoxy/Ag Flakes/MXene@Ag Composites Achieved by In Situ Sintering of Silver Nanoparticles

“…This is due to crystal defects and incomplete thermal conduction pathways formed during sintering. 28,29 However, increasing the filler rate can negatively impact the printability and cost-effectiveness of TCAs. To address these challenges, researchers have proposed two solutions: first, surface modification of the metal filler to reduce interfacial thermal resistance between the filler and polymer; second, hybridization with other thermally conductive fillers, such as graphene, expanded graphite, boron nitride nanosheets, and MXene, to strengthen the TC network.…”

“…As a result, higher filler concentrations are required in Ag NPs and polymer composites to achieve optimal TC. This is due to crystal defects and incomplete thermal conduction pathways formed during sintering. , However, increasing the filler rate can negatively impact the printability and cost-effectiveness of TCAs. To address these challenges, researchers have proposed two solutions: first, surface modification of the metal filler to reduce interfacial thermal resistance between the filler and polymer; second, hybridization with other thermally conductive fillers, such as graphene, expanded graphite, boron nitride nanosheets, and MXene, to strengthen the TC network. ,− Chen et al a “top-down” strategy by splitting highly purified Ag foil with nanoscale thickness was adopted to prepare two-dimensional Ag nanoflakes with an intrinsic thermal conductivity of 398.2 W/(m·K), reaching 93% of the theoretical value.…”

Evaluation of Effective Heat Transport and Temperature Gradients in Thermally Anisotropic Particulate Arrangements

“…Their layered arrangement ensures anisotropic heat conduction and superior thermal insulation. With the advent of additive manufacturing, additional degrees of freedom are possible to control the arrangement of anisotropic objects locally and, hence, the direction of heat transport. , Additionally, components with intrinsic anisotropic properties are used in composite materials . For example, graphite flakes form the basis for battery anode materials, , and laminates often incorporate anisotropic fillers .…”

“…21 objects locally and, hence, the direction of heat transport. 2,22 Additionally, components with intrinsic anisotropic properties are used in composite materials. 23 For example, graphite flakes form the basis for battery anode materials, 24,25 and laminates often incorporate anisotropic fillers.…”