Conventional three-dimensional
(3D) thermal conductors or heat
sinks are normally bulky solids with high density, which is cumbersome
and not portable to satisfy current demands for soft and flexible
electronic devices. To address this issue, here, a lightweight, superelastic
yet thermally conductive boron nitride (BN) nanocomposite aerogel
is designed by a facile freeze-drying method. The attained aerogel
constituting of tailored interconnected binary inorganic–organic
network structure exhibits low bulk density (6.5 mg cm–3) and outstanding mechanical performances for compression, clotting,
and stretching. Meanwhile, the aerogel has promising thermal stability
and high thermal conductivity over wide temperature ranges (30–300
°C), validating the application even in extremely hot environments.
Moreover, the aerogel can serve as a lightweight and elastic heat
conductor for the enhancement of thermal energy harvest. Interestingly,
during alternate strain loading/unloading under heating, the superelasticity
and the anisotropy of thermal conductive transduction make the aerogel
enable the elastic thermal energy capture and dynamic regulation.
Therefore, our findings provide a potential use for the thermally
conductive aerogel in future green energy applications.
Using thermodynamic models is a desired method for predicting an equilibrium when occurring in a system. If a thermodynamic model can predict an equilibrium condition in a pyrolysis, for a new way will be open for scientists in predicting equilibrium in a reaction without need to kinetic models. In this work, low-density polyethylene, polypropylene, and polyethylene terephthalate were used instead of feed of pyrolysis process. The process was maintained at 500°C with 5 different temperature raising ratios 6, 8, 10, 12, and 14. Then the process was modeled thermodynamically using NRTL activity coefficient model. Using this model, the binary interaction coefficients were investigated for the system of “char, oil, and gas.” Results showed that polyethylene and polypropylene produced the maximum liquid product. Calculated RMSD objective function was 0.0157; that it is acceptable for this process.
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