BIBLIOS

Document type
Conference papers

Document subtype
Extended abstract/Short paper

Title
Ionanofluids for thermal applications

Participants in the publication
Carlos Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE
S.M.S. Murshed (Author)
Dep. Química e Bioquímica
CQE
Maria José Lourenço (Author)
Dep. Química e Bioquímica
CQE
Fernando J. Vieira dos Santos (Author)
Dep. Química e Bioquímica
CQE
Manuel Matos Lopes (Author)
Dep. Química e Bioquímica
CQE
João França (Author)
Salomé I. Vieira (Author)
Dep. Química e Bioquímica
Francisco Bioucas (Author)
CQE

Summary
An IoNanofluid is defined as a stable dispersion of the nanomaterial in an ionic liquid (IL). Since we first reported the enhanced thermal conductivity of this new class of fluids with respect to the pure ionic liquid [1], many experimental and theoretical studies have been performed, using several nanomaterials like carbon nanotubes and graphene in various ILs. There are several reasons to study these emerging nanomaterials-ILs complex systems that can be summarized in the following points:\\n• Enhanced thermal properties for heat transfer and heat storage\\n• Complex interactions create nano-regions that enhance reactivity and selectivity of chemical reactions (nanocatalysis)\\n• IoNanofluids are designable and fine-tunable through base ILs to meet any specific application or task requirement\\n• Non-flammability and non-volatility at ambient conditions, environmentally friendly solvents, and reaction fluids\\n \\nHowever, the success of its use in scientific or industrial applications depends how we analyze and characterize the emulsion prepared and its stability, as particle aggregation can destroy our purpose. Aggregation of nanoparticles (NPs) in ionic liquids is caused by a competition between Van der Waals (VDW) or polar forces and double layer (DL) forces screening caused by ions (DL), at the particle/IL interface. VDW forces are attractive and DL forces are repulsive. Balance between these forces control aggregation of NPs in ILs, and therefore the stability of a dispersion in the IoNanofluid. In the end, aggregation can originate phase separation, as explained in Fig. 1. Although achieving proper and long-term stability of such complex fluids is challenging, it is crucial for their application particularly in thermal systems.\\nFig. 1. Illustration of nanoparticle aggregation (partially adapted from [2]).\\nIt is the purpose of this paper to give an overall view of the actual situation in the field, with special emphasis in the applications of IoNanofluids to thermal systems as new heat transfer fluids


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Event
Nanouptake COST Action Working Group Meeting

Publication Identifiers

Address
Castellon de la Plana, Spain

Organizers
Nanouptake

Document Identifiers
URL - http://nanouptake.uji.es/wp-content/uploads/2017/12/Event1_posterFinal-Final.pdf

Keywords
Ionanofluids density viscosity Thermal conductivity Thermal Applications Preparation