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Synthesis of silver nanoparticle decorated multiwalled carbon nanotubes-graphene mixture and its heat transfer studies in nanofluid
Published in American Institute of Physics Inc.
2013
Volume: 3
   
Issue: 1
Abstract
The present study describes a novel synthesis procedure for a hybrid nanostructure consisting of multiwalled carbon nanotubes (MWNT), hydrogen exfoliated graphene (HEG) and silver nanoparticles. Moreover, synthesis of nanofluids using the above hybrid material and their heat transfer properties are discussed. The hybrid structure of MWNT and HEG (MWNT-HEG) has been synthesized by a simple mixing of MWNT and graphite oxide (GO) followed by exfoliation of this mixture in hydrogen atmosphere. The sample has been characterized with different experimental techniques. After surface functionalization, this hybrid material is decorated with silver nanoparticles (Ag/(MWNT-HEG)) and dispersed in ethylene glycol (EG) without any surfactant. The thermal conductivity and convective heat transfer properties are measured for different volume fractions. An enhancement of ∼8% in thermal conductivity is obtained for a volume fraction of 0.04% at 25°C. The convective heat transfer coefficient of these nanofluids is determined using an in-house fabricated setup. The enhancement in heat transfer coefficient is about 570% for 0.005% volume fraction at the entrance of the pipe for Re = 250. Copyright © 2013 Author(s).
About the journal
JournalData powered by TypesetAIP Advances
PublisherData powered by TypesetAmerican Institute of Physics Inc.
ISSN21583226
Open AccessNo
Concepts (26)
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    Convective heat transfer
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    Convective heat transfer coefficient
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    Experimental techniques
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    GRAPHITE OXIDE
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    HEAT TRANSFER PROPERTIES
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    Hybrid nanostructures
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    Hybrid structure
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    Hydrogen atmosphere
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    HYDROGEN EXFOLIATED GRAPHENE
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    Multi-walled
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    Nanofluids
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    Silver nanoparticles
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    Surface functionalization
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    SYNTHESIS PROCEDURE
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    Ethylene glycol
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    Graphene
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    Heat transfer coefficients
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    Hybrid materials
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    Hydrogen
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    Multiwalled carbon nanotubes (mwcn)
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    Nanoparticles
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    Silver
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    Synthesis (chemical)
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    Thermal conductivity
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    Volume fraction
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    Nanofluidics