Giant Thermal Rectification from Polyethylene Nanofiber Thermal Diodes

Abstract

The realization of phononic computing is held hostage by the lack of high performance thermal devices. Here we show through theoretical analysis and molecular dynamics simulations that unprecedented thermal rectification factors (as large as 1.20) can be achieved utilizing the phase dependent thermal conductivity of polyethylene nanofibers. More importantly, such high thermal rectifications only need very small temperature differences (< 20 oC) across the device, which is a significant advantage over other thermal diodes which need temperature biases on the order of the operating temperature. Taking this into consideration, we show that the dimensionless temperature-scaled rectification factors of the polymer nanofiber diodes range from 12 to 25 - much larger than other thermal diodes (< 8). The polymer nanofiber thermal diode consists of a crystalline portion whose thermal conductivity is highly phase-sensitive and a cross-linked portion which has a stable phase. Nanoscale size effect can be utilized to tune the phase transition temperature of the crystalline portion, enabling thermal diodes capable of operating at different temperatures. This work will be instrumental to the design of high performance, inexpensive and easily processible thermal devices, based on which thermal circuits can be built to ultimately enable phononic computing.

References in corpus (8)

• Phononics: Manipulating heat flow with electronic analogs and beyond
• Thermal diode: Rectification of heat flux
• Thermal Conductivity and Thermal Rectification in Graphene Nanoribbons: a Molecular Dynamics Study
• Negative differential thermal resistance and thermal transistor
• Carbon Nanocone: A Promising Thermal Rectifier
• Thermal rectification in carbon nanotube intramolecular junctions: Molecular dynamics calculations
• Thermal rectification in thickness-asymmetric graphene nanoribbons
• Thermal rectifier from deformed carbon nanohorns

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