BIBLIOS

Document type
Conference papers

Document subtype
Extended abstract/Short paper

Title
Thermal Properties of Aqueous and Ionic Liquids Based Carbon Nanotubes suspensions

Participants in the publication
S.M.S. Murshed (Author)
Dep. Química e Bioquímica
CQE
C.A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
M.J.V. Lourenço (Author)
Dep. Química e Bioquímica
CQE
F.J.V. Santos (Author)
Dep. Química e Bioquímica
CQE
M.L.M Lopes (Author)
Dep. Química e Bioquímica
CQE

Summary
Both the carbon nanotubes and nanofluids are emerged in early 1990 [1-2] and since then they have attracted great interest from both the researchers and the industrial communities due to their fascinating properties and potential applications in numerous important fields. While the aqueous carbon nanotubes (CNT) suspensions are known as conventional nanofluids [3-4], the ionic liquids (IL)-based CNT-dispersion systems, which are new class of nanofluids, was recently introduced as “ionanofluids” by our group [5]. With ultra-high thermal conductivity of carbon nanotubes (up to 6000 W/m-K which is orders of magnitude higher than those of the metallic or oxide nanomaterials) their aqueous or IL based suspensions showed anomalously higher thermal properties compared to the base fluids as well as any nanofluids containing other types of nanomaterials [3-8]. In addition to high thermal conductivity and high heat capacity, CNT-ionanofluids exhibit non-volatile, designable, and green solvent characteristics. Other attractive features of ionanofluids are that they are designable and fine-tunable through their base ionic liquids for desired properties and tasks. Thus ionanofluids can be used as advanced heat transfer fluids in numerous cooling technologies, heat exchangers, chemical engineering, and energy-based applications [6, 8]. Literature studies on thermal properties particularly thermal conductivity of CNT-nanofluids revealed their great potentials as advanced heat transfer media and for numerous other applications. There is therefore an increasing research interest on thermal properties and features of CNT-nanofluids. Research efforts on this nanofluid are scattered and findings from different research groups also lack consistencies. \\nWhile nanofluids are widely known to exhibit anomalously higher thermal properties compared to those of their base fluids, ionanofluids (IL-based nanofluids) as a recently innovated topic has yet to receive considerable attention from the researchers and thus not much results available in the literature. Given the prospect and potentials of CNT dispersed nanofluids as well as ionanofluids, it is imperative and timely to provide an informative overview of research findings on these new fluids. Thus, key thermal properties such as thermal conductivity and heat capacity of carbon nanotubes dispersed aqueous and ionic liquids based nanofluids have been reported in this paper. Besides literatures studies results from our own research on these properties of IL based CNT-nanofluids are also presented. Effects of CNT concentration and temperature on these properties of these nanofluids are analyzed. \\nA summary of room temperature thermal conductivity results of CNT-nanofluids obtained from literature is presented in Table 1, which clearly demonstrates that the significant enhancement of thermal conductivity of nanofluids with CNT concentration is obvious. Interestingly, the enhanced thermal conductivity increases even more pronouncedly with increasing temperature as evidenced from Figure 1. Such increase in thermal conductivity with temperature makes these nanofluids more attractive for their applications at elevated temperature condition.

Editor(s)
A. Coronas, Daniel Salavera


Event
Proceedings of the 4th International Workshop on Ionic Liquids-Advanced Energy Applications (WILS2015)

Publication Identifiers

Address
Tarragona, Spain

Organizers
Universitat Rovira i Virgili, Tarragona, Spain, Universidade de Lisboa (Portugal), Indian Institute of Technology Madras, (Chennai, India), National Chemical Laboraroty (Pune, India), Anna University (Chennai, India) and Universidad de Concepción (Chile)

Publisher
Universitat Rovira i Virgili



Document Identifiers
URL - https://www.researchgate.net/publication/271701286_thermal_properties_of_aqueous_and_ionic_liquid_based_carbon_nanotubes_suspensions