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Title: | Visible-LightResponsiveAzobenzeneandCholesterolBased Liquid Crystalsas EfficientSolid-StateSolar−ThermalFuels |
Authors: | KM, A.K Sony, S. Dhingra, S. Gupta, M. |
Issue Date: | 2-May-2024 |
Abstract: | olar−thermalfuels(STFs)basedon photoresponsivemolecules,whichcanharvestandstoresolarenergyby theconfigurationalchangeof moleculesandcan releaseit in the formof heaton demand,havebeeninvestigatedrecently.So far,azobenzenehas beenthe mostwidelystudiedmoleculefor theseapplications.However,untilnow,onlysolidand liquidderivativesofazobenzenehavebeenexploredwhichsufferfromseverallimitations.Here,we are reportingfor the firsttimevisible-lightresponsiveSTFsbasedon liquidcrystals(LCs).We havepreparedaseriesof compoundsbasedon azobenzeneandcholesterolwithvaryingspacerandortho-substitutionon azobenzene.All of thesederivativesexhibitenantiotropicchiralnematic(N*)mesophases.Moreover,theyshowedexcellentphotostability,photocyclability,and longhalf-lifetimesofcis-states.We havefurtherevaluatedthe thinfilmsof thesecompoundsfor charging,i.e.,transtocisconversionundersolarirradiationusingvariousbandpassfilters,andalsostudiedthe kineticsof the conversion.Thesecompoundsexhibiteda maximumchargingof up to 70%for the derivativewithortho-fluoroazobenzene.Thechargedthinfilmswerefurtherevaluatedfor theirheatreleasepropertiesby infrared(IR)thermalimaging.Themaximumheatreleaseobservedwasaround5.4°C fromthe surroundingtemperaturewhichwassignificantlyhigheras comparedto similarlysubstitutedazobenzene-basedderivativewithouta LC phase |
URI: | http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/4398 |
Appears in Collections: | Year-2023 |
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