Iqembu lososayensi baseBrown University selifunde inkinga osekunesikhathi eside ingenaso isixazululo. Ngakho-ke, ngesinye isikhathi, i-polymer PBO (polybenzoxazole) ehlala isikhathi eside kakhulu yahlongozwa ukuba ibe yisivikelo somzimba. Ngokusekelwe ku-polybenzoxazole, izikhali zempi ze-serial zakhiqizwa i-US Army, kodwa ngemva kwesikhathi esithile zahoxiswa. Kwavela ukuthi le nto yezikhali zomzimba ingaphansi kokubhujiswa okungalindelekile ngaphansi kwethonya lomswakama. Lokhu akuvimbeli ukukhiqizwa nokudayiswa kwezikhali zomzimba kusukela ekulungisweni okuhlukahlukene kwe-PBO ngaphansi komkhiqizo we-Zylon, kodwa ukwethembeka kwezinto ezisetshenziswayo kusashiya okuningi okudingekayo.
Inkinga ngokuthembeka kwe-PBO ukuthi isebenzisa i-polyphosphoric acid (PPA) edla kakhulu ukudiliza amaketanga e-polymer ngesikhathi sokwenza izinto. I-asidi isebenza kokubili njenge-solvent nanjenge-catalyst. Ama-molecule e-asidi asele kuma-molecule e-polymer azenza azizwele ngesikhathi sokusebenza kwezivikelo zomzimba ngokucekelwa phansi kwezinto ezingalindelekile. Uma ushintsha i-PPA ngokuthile okungenangozi, ukusebenza kwama-polymers e-PBO kungathuthukiswa ngendlela emangalisayo, kodwa ngani?
Ososayensi abavela eNyuvesi yaseBrown njenge-catalyst yokwakha amaketanga wamamolekyuli e-PBO ingxubevange yegolide (Au) kanye palladium (Pd) nanoparticles. Ukuhlolwa kwembule isilinganiso esifanele senye nenye - igolide elingu-40% kanye ne-palladium engu-60% - okusheshise kakhulu ukukhiqizwa kwe-polymer. Kulokhu, i-solvent yayiyi-asidi ye-formic, into eluhlaza engavumelani nemvelo futhi evuselelekayo. Ngokuvamile, inqubo entsha yobuchwepheshe ayisebenzisi kakhulu amandla futhi ayibizi njengokusebenzisa i-polyphosphoric acid.
Ngemva kokukhiqiza imiqulu eyanele ye-PBO polymer kusetshenziswa indlela entsha, yahlolwa ngokuyibilisa emanzini nase-asidi izinsuku eziningi. Izinto azizange zehliswe, okunikeza ithemba lokwanda okukhulu ekusebenzeni kwezingubo zokuzivikela zomzimba ezisetshenziswayo. Isihloko esinikezelwe kulolu cwaningo sishicilelwe kujenali .
Source: 3dnews.ru