Thaum Lub Kaum Hli 15th, cov kws tshawb fawb ntawm Chalmers University of Technology hauv Sweden tau ua tiav ib hom tshiab ntawm ultra-ruaj khov thiab ruaj khov iav nrog cov ntaub ntawv muaj peev xwm suav nrog cov tshuaj, cov ntxaij vab tshaus digital thiab hnub ci tshuab thev naus laus zis. Txoj kev tshawb no qhia tau hais tias yuav ua li cas sib tov ntau molecules (txog yim rau ib lub sij hawm) tuaj yeem tsim cov khoom uas ua tau zoo raws li qhov zoo tshaj plaws iav tsim cov neeg ua haujlwm tam sim no paub.
Iav, tseem hu ua "amorphous solid", yog cov khoom uas tsis muaj qhov ntev-ntev xaj qauv-nws tsis tsim muaju. Ntawm qhov tod tes, cov ntaub ntawv crystalline yog cov khoom siv nrog cov qauv txiav txim siab thiab rov ua dua.
Cov khoom uas peb feem ntau hu ua "iav" hauv lub neej niaj hnub feem ntau yog ua los ntawm silica, tab sis iav tuaj yeem ua los ntawm ntau yam khoom sib txawv. Yog li ntawd, cov kws tshawb fawb yeej ib txwm xav nrhiav txoj hauv kev tshiab los txhawb cov ntaub ntawv sib txawv los tsim lub xeev amorphous no, uas yuav ua rau kev txhim kho cov iav tshiab nrog cov khoom zoo dua qub thiab cov ntawv thov tshiab. Cov kev tshawb fawb tshiab tsis ntev los no tau tshaj tawm hauv phau ntawv xov xwm tshawb fawb "Science Advances" sawv cev rau ib kauj ruam tseem ceeb rau kev tshawb fawb.
Tam sim no, los ntawm kev sib xyaw ntau cov molecules sib txawv, peb mam li qhib lub peev xwm los tsim cov khoom iav tshiab thiab zoo dua. Cov neeg uas kawm txog cov organic molecules paub tias kev siv cov khoom sib xyaw ntawm ob lossis peb lub molecules sib txawv tuaj yeem pab tsim iav, tab sis ob peb tus tuaj yeem cia siab tias ntxiv cov molecules ntxiv yuav ua tiav cov txiaj ntsig zoo, "cov kws tshawb fawb tau coj cov kev tshawb fawb. xibfwb Christian Müller los ntawm Department of Chemistry thiab Chemical Engineering ntawm Ulms University tau hais.
Cov txiaj ntsig zoo tshaj plaws rau txhua yam khoom siv iav
Thaum cov kua txias tsis muaj crystallization, iav yog tsim, txheej txheem hu ua vitrification. Kev siv cov khoom sib tov ntawm ob lossis peb lub molecules los txhawb kev tsim iav yog lub tswv yim paub tab. Txawm li cas los xij, cov nyhuv ntawm kev sib xyaw ntau ntawm cov molecules ntawm lub peev xwm tsim iav tau txais kev saib xyuas me ntsis.
Cov kws tshawb fawb tau sim sib xyaw ntawm ntau li yim yam sib txawv ntawm cov perylene molecules, uas ib leeg muaj lub siab brittleness-tus yam ntxwv no muaj feem xyuam rau qhov yooj yim ntawm cov khoom siv iav. Tab sis sib xyaw ntau cov molecules ua ke ua rau txo qis hauv brittleness thiab ua rau cov iav muaj zog heev nrog ultra-low brittleness.
"Lub brittleness ntawm iav peb tau ua nyob rau hauv peb kev tshawb fawb yog tsawg heev, uas sawv cev rau qhov zoo tshaj plaws iav-forming muaj peev xwm. Peb tau ntsuas tsis yog cov khoom siv organic nkaus xwb tab sis kuj tseem muaj cov khoom siv polymers thiab cov khoom siv tsis zoo (xws li cov iav hlau loj). Cov txiaj ntsig tau zoo dua li cov iav zoo tib yam. Cov iav tsim muaj peev xwm ntawm lub qhov rais iav yog ib qho zoo tshaj plaws iav qub uas peb paub, "said Sandra Hultmark, tus kws kho mob cov tub ntxhais kawm hauv Department of Chemistry thiab Chemical Engineering thiab tus thawj coj ntawm txoj kev tshawb no.
Txhim kho lub neej ntawm cov khoom thiab txuag cov peev txheej
Cov ntawv thov tseem ceeb rau cov iav organic ruaj khov yog cov cuab yeej tso saib xws li OLED cov ntxaij vab tshaus thiab cov cuab yeej siv hluav taws xob tauj dua tshiab xws li cov hnub ci organic.
"OLEDs yog tsim los ntawm iav txheej ntawm lub teeb-emitting organic molecules. Yog tias lawv ruaj khov dua, nws yuav ua rau kom muaj zog ntawm OLED thiab qhov kawg ntawm qhov ua tau zoo ntawm cov zaub, "hais Sandra Hultmark.
Lwm daim ntawv thov uas yuav tau txais txiaj ntsig los ntawm iav ruaj khov yog tshuaj. Cov tshuaj amorphous yaj sai dua, uas yuav pab kom nqus tau cov khoom xyaw sai sai thaum noj. Yog li ntawd, ntau yam tshuaj siv iav-forming cov ntaub ntawv tshuaj. Rau cov tshuaj, nws yog ib qho tseem ceeb uas cov khoom siv vitreous tsis crystallize lub sijhawm. Qhov ruaj khov dua cov tshuaj glassy, lub txee lub neej ntawm cov tshuaj ntev dua.
Christian Müller tau hais tias "Nrog cov iav ruaj khov dua lossis cov khoom siv iav tshiab, peb tuaj yeem txuas ntxiv lub neej kev pabcuam ntawm ntau cov khoom, yog li txuag cov peev txheej thiab kev lag luam," Christian Müller tau hais.
"Lub vitrification ntawm Xinyuanperylene sib tov nrog ultra-low brittleness" tau luam tawm nyob rau hauv lub scientific phau ntawv journal "Science Advances".
Post lub sij hawm: Dec-06-2021