S?awomir BONCEL1, Bertrand JOZWIAK1, Grzegorz DZIDO1, Edward ZOREBSKI2, Anna KOLANOWSKA1, Rafal JEDRYSIAK1, Justyna DZIADOSZ2, Heather GREER3, Marcin LIBERA2, Marzena DZIDA2
1Silesian University of Technology, Gliwice, Poland
2University of Silesia, Katowice, Poland
3University of Cambridge, Cambridge, United Kingdom
Transfer of the excellent intrinsic properties of individual carbon nanoparticles from nano- to macro-scale in the heat transfer fluids remains challenging. This process requires well-designed both dispersed and continuous phases, and quantification of the nanoparticle–liquid interface. Aiming at the novel, high-performance heat transfer ionanofluids, we have designed and cross-verified morphology and physicochemical properties of carbon nanoparticles as well as the nanocarbon-ionic liquid interface by a variety of techniques, including transmission electron cryomicroscopy (cryo-TEM).
Herein, we have systematically investigated how the particle morphology and surface physicochemistry of carbon nanomaterials would lead to the most prospective characteristics. Those properties encompass thermal conductivity, specific isobaric heat capacity, thermal diffusivity, density, and viscosity of ionanofluids and/or bucky gels based on 1-ethyl-3-methylimidazolium thiocyanate [EMIM][SCN] as the continuous phase. A wide range of dispersed phase from 0D- to 3D-nanoparticles was tested indicating single-walled (SW-) and multi-walled carbon nanotubes (MWCNTs) – of extreme aspect ratio from 150 to 11?000 – as 1D nanoparticles enabling formation of stable thermoconductive networks. Our studies revealed that thermal conductivity could be remarkably improved to the maximum values of 44% and 68% for ionanofluid and bucky gel (at 1 wt.% loading of MWCNTs and SWCNTs), respectively, as compared to the base fluid. A model proposed by Murshed et al. has been improved for a realistic description of the concentration-dependent thermal conductivity of the ionanofluids. The obtained results indicate the potential of ionanofluids and bucky gels for energy management.
 Remarkable Thermal Conductivity Enhancement in Carbon-Based Ionanofluids: Effect of Nanoparticle Morphology, Bertrand Jó?wiak, Grzegorz Dzido, Edward Zor?bski, Anna Kolanowska, Rafa? J?drysiak, Justyna Dziadosz, Marcin Libera, S?awomir Boncel, and Marzena Dzida, ACS Appl. Mater. Interfaces 2020, 12, 34, 38113–38123.
This work was financially supported by the National Science Centre (Poland) Grant No. 2021/41/B/ST5/00892.