Nacre-bionic nanocomposite membrane for efficient in-plane dissipation heat harvest under high temperature

• Main Authors: Jiemin Wang, Dan Liu, Quanxiang Li, Cheng Chen, Zhiqiang Chen, Minoo Naebe, Pingan Song, David Portehault, Christopher J. Garvey, Dmitri Golberg, Weiwei Lei
• Format: Article
• Language: English
• Published: Elsevier 2021-03-01
• Series: Journal of Materiomics
• Subjects: Boron nitride nanosheets; Nanocomposite membrane; Nacre-biomimetic; High temperature heat spreader; In-plane dissipation heat
• Online Access: http://www.sciencedirect.com/science/article/pii/S2352847820301945

Waste heat management holds great promise to create a sustainable and energy-efficient society as well as contributes to the alleviation of global warming. Harvesting and converting this waste heat in order to improve the efficiency is a major challenge. Here we report biomimetic nacre-like hydroxyl-functionalized boron nitride (BN)-polyimide (PI) nanocomposite membranes as efficient 2D in-plane heat conductor to dissipate and convert waste heat at high temperature. The hierarchically layered nanostructured membrane with oriented BN nanosheets gives rise to a very large anisotropy in heat transport properties, with a high in-plane thermal conductivity (TC) of 51 W m−1 K−1 at a temperature of ∼300 °C, 7314% higher than that of the pure polymer. The membrane also exhibits superior thermal stability and fire resistance, enabling its workability in a hot environment. In addition to cooling conventional exothermic electronics, the large TC enables the membrane as a thin and 2D anisotropic heat sink to generate a large temperature gradient in a thermoelectric module (ΔT = 23 °C) through effective heat diffusion on the cold side under 220 °C heating. The waste heat under high temperature is therefore efficiently harvested and converted to power electronics, thus saving more thermal energy by largely decreasing consumption.