Ink free paper los hloov cov ntawv ib txwm

A thev naus laus zis tshiab tuaj yeem pab daws teeb meem ntau ntxiv hauv ib puag ncig thiab cov peev txheej sustainability. Daim ntawv, tsim los ntawm University of California, Riverside, tuaj yeem sau thiab tshem tawm ntau zaus.

Daim ntawv no, nyob rau hauv daim ntawv ntawm iav los yog yas zaj duab xis, siv redox dyes. Cov dyeing ua rau "duab txheej" ntawm daim ntawv, cov duab thiab cov ntawv, thiab UV teeb photobleaches cov xim tsuas yog cov xim uas ua rau cov ntawv lossis cov duab ntawm daim ntawv. Lub teeb UV txo cov xim rau nws cov xim tsis muaj xim kom pom tau tsuas yog cov duab lossis cov ntawv tsim. Txhua yam uas tau sau tseg nyob rau hauv 3 hnub.

Txhua yam yog tshem tawm los ntawm cua sov ntawm 115 C, uas yog "re-oxidation ntawm cov xim uas txo qis rov qab cov xim qub." Kev tshem tawm tuaj yeem ua tiav hauv 10 feeb.

Nrog rau txoj kev no, daim ntawv no tuaj yeem sau rau, tshem tawm, thiab rov sau dua ntau dua 20 zaug "tsis muaj qhov poob loj hauv qhov sib piv lossis kev daws teeb meem." Daim ntawv tuaj yeem ua peb xim: xiav, liab, thiab ntsuab.

raws li Yadong Yin, tus xibfwb ntawm chemistry uas tau pab coj kev tshawb fawb ntawm qhov kev txhim kho no, "cov ntawv sau rov qab no tsis xav tau cov ntawv luam ntawv ntxiv, ua rau kev lag luam thiab ib puag ncig zoo. Nws sawv cev rau qhov txaus nyiam rau cov ntawv tsis tu ncua hauv kev ua kom tau raws li qhov xav tau thoob ntiaj teb ntxiv rau kev ruaj khov thiab kev txuag ib puag ncig. " Qhov kev tsim kho tshiab no tuaj yeem txo qis kev siv cov ntawv, ib qho kev cog lus ntawm lub hnub nyoog digital tshiab.

Raws li cov WWF, daim ntawv yog tsim nyob ib ncig ntawm 400 lab tons (362 lab tonnes) ib xyoos thiab nce.