Title : ( Synthesisofwater-solubleFe-decoratedmulti-walledcarbonnanotubes:Astudyonthermo-physicalpropertiesofferromagneticnanofluid )
Authors: Mehdi Shanbedi , Saeed Zeinali Heris , AhmadAmiri , Hossein Eshghi ,
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Abstract
Adirectcouplingofcarboxylicacids-treatedmulti-walledcarbonnanotubes(MWNT)surfacewithaminesisintroducedtofunctionalizeMWNTwithasparticacids(Asp).Amideformationhasbeencarriedoutinthepresenceofsimplezirconiumcatalystsat5mol%loadingandthensurfacefunctionalitygroupsandmor-phologyofAsp-treatedMWNTwerestudiedbyinfraredspectroscopy,thermogravimetricanalysis,Ramanspectroscopy,andtransmissionelectronmicroscopy.ToimposemagneticpropertytothesurfaceofMWNT,FeionscovalentlyattachedthroughthecarboxylicacidsgroupofAsp.ThispromisingmethodofusingacombinationoffunctionalironandAspbasedonMWNTwasintroducedforincreasingstabilityandthermo-physicalpropertiesofMWNT-basedwaternanofluids.MWNTwasstablydispersedinaqueousmediaandinthesecondphaseofstudy,theferromagneticMWNT-basedwaternanofluidswerepreparedatdifferentcon-centrationstoestimatethethermo-physicalandrheologicalproperties.Density,viscosity,electricalandther-malconductivitybehaviorofMWNT-basedwaternanofluidsinthepresenceofferromagnetic,(Fe),covalent(Asp)andnon-covalent(GumArabic)functionalgroupswereinvestigatedandpromisingresultsobtained.Itwasfoundthattherheologicalandthermo-physicalpropertiesofferromagneticsamplesweresignificantlyenhancedcomparedtothecovalentnanofluidsandcertainlypurewater.
