简介:Underanappliedvoltage,dielectricelastomers(DEs)produceanactuationstrainthatisnonlinear,partlybecauseofthematerialproperties.Inthisstudy,anexperimentalcharacterizationisconductedtoevaluatehowtheambienttemperatureandpre-stretchaffectedtheactuationperformance.ForDEswithapre-stretchof2×2,anincreaseoftemperaturefrom-10°to80°resultsinavariationintheactuationstrainofmorethan1700%.Lowpre-stretchedDEsaremoresusceptibletotemperaturechange;whilehighlypre-stretchedDEsarerelativelyinsensitivetotemperature,becauseinthiscasetheenergyconversionwasdominatedbymechanicalstretching,ratherthanthermalconduction,duringtheactuation.
简介:Inthisstudy,one-dimensionaltitaniananotubes(TNTs)weresynthesizedusingacombinedprocessofchemicalandhydrothermaltreatments,andtheiractivitiesforthephotocatalyticreactionsofselectedgaseouspollutantsatsub-ppmlevelsweredetermined.Additionally,thepropertiesoftheTNTswereexaminedusingselectedspectroscopicmethods.TheannealedTNTsshowedhigherphotocatalyticactivitiesforthefourtargetcompoundsthandidtheunannealedTNTs.Forallthetargetcompoundsexceptbenzene,theeffectoftheannealingtemperatureonthedegradationefficiencywasdifficulttodeterminebecausealldegradationefficiencieswereveryhigh.However,forbenzene,whichdecomposedwithalowefficiency,thedegradationactivitiesoftheTNTsincreasedasthetreatmenttemperaturewasincreasedfrom250to300℃,whiletheydecreasedslightlywhenthetemperaturewasincreasedfrom300to400℃.ThesefindingsconfirmthepresenceofanoptimalannealingtemperatureforthesynthesisofTNTs.Moreover,theaveragedegradationextentsforbenzene,toluene,ethylbenzene,ando-xylenedecreasedfrom92%,96%,99%,and98%to77%,86%,92%,and94%,respectively,astheairstreamflowrateincreasedwithintherangeof1-4L/min.Theaveragedegradationextentsdecreasedfrom12%,75%,87%,and88%to3%,29%,46%,and51%,respectively,astheinputconcentrationincreasedfrom0.4to1.9ppm.Overall,thesefindingssuggestthatone-dimensionalTNTscanbeeffectivelyutilizedforthedegradationofgaseouspollutantsunderoptimaloperationalconditions.
简介:ByFP-LAPWcalculations,thestructural,elastic,DebyeandCurietemperatures,electronicandmagneticpropertiesofCo2VAlareinvestigated.TheresultsindicatethatFerromagnetic(FM)phaseismorestablethanAntiFerromagnetic(AFM)andNon-magnetic(NM)ones.Inaddition,C11–C12>0,C44>0,andB>0soCo2VAlisanelasticallystablematerialwithhighDebyetemperature.Also,theB/Gratioexhibitsaductilitybehavior.TherelativelyhighCurietemperatureprovidesitasafavorablematerialforspintronicapplication.It’selectronicandmagneticpropertiesarestudiedbyGGA+Uapproachleadingtoa100%spinpolarizationatFermilevel.