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Ofufuza aku China amapanga superelastic hard carbon nanofiber aerogels


Polimbikitsidwa ndi kusinthasintha komanso kusasunthika kwa ukonde wa kangaude wachilengedwe, gulu lofufuza motsogozedwa ndi Prof. YU Shuhong wa ku University of Science and Technology of China (USTC) adapanga njira yosavuta komanso yanthawi zonse yopangira ma aerogel olimba kwambiri komanso osatopa okhala ndi nanofibrous. mawonekedwe a network pogwiritsa ntchito resorcinol-formaldehyde resin ngati gwero lolimba la kaboni.

Chinese researchers develop superelastic hard carbon nanofiber aerogels1

M'zaka makumi angapo zapitazi, ma carbon aerogels akhala akufufuzidwa kwambiri pogwiritsa ntchito ma graphic carbons ndi soft carbons, omwe amasonyeza ubwino mu superelasticity. Ma aerogels otanuka awa nthawi zambiri amakhala ndi ma microstructures osalimba komanso osatopa koma amakhala olimba kwambiri. Ma carbon olimba amawonetsa zabwino zambiri mu mphamvu zamakina komanso kukhazikika kwamapangidwe chifukwa cha sp3 C-induced turbostratic "house-of-card" kapangidwe kake. Komabe, kuuma ndi fragility momveka bwino kumalepheretsa kukwaniritsa superelasticity ndi ma carbons olimba. Mpaka pano, ndizovuta kupanga ma aerogels olimba kwambiri a carbon.

The polymerization wa utomoni monomers unayambika pamaso pa nanofibers monga zidindo structural kukonzekera hydrogel ndi maukonde nanofibrous, kenako kuyanika ndi pyrolysis kupeza hard carbon aerogel. Pa polymerization, ma monomers amayika pa ma templates ndikuwotcherera maulalo a fiber-fiber, kusiya ma netiweki mwachisawawa okhala ndi mfundo zazikuluzikulu zolimba. Kuphatikiza apo, mawonekedwe akuthupi (monga ma diameter a nanofiber, kachulukidwe ka ma aerogels, ndi makina amakina) amatha kuwongoleredwa ndikungokonza ma tempulo ndi kuchuluka kwa zida.

Chifukwa cha ma nanofibers olimba a kaboni komanso ma nanofibers olumikizana ambiri, ma aerogel olimba a carbon amawonetsa machitidwe olimba komanso osasunthika, kuphatikiza kukhathamira kwambiri, kulimba kwambiri, kuthamanga kwambiri kuchira (860 mm s-1) komanso kuchepa kwamphamvu kwamphamvu ( <0.16] Pambuyo poyesedwa pansi pa 50 % kupsyinjika kwa 104, mpweya wa carbon airgel umasonyeza 2% yokha ya pulasitiki, ndikusunga 93 % kupsinjika koyambirira.

The hard carbon airgel imatha kukhalabe yolimba kwambiri mumikhalidwe yovuta, monga mumadzi nayitrogeni. Kutengera ndi mawonekedwe osangalatsa amakina, airgel yolimba ya kaboni iyi ili ndi lonjezo pakugwiritsa ntchito masensa opanikizika omwe amakhala okhazikika komanso ofufuza ambiri (50 KPa), komanso ma conductor otambasuka kapena opindika. Njirayi ikulonjeza kuti idzakulitsidwa kupanga ma nanofibers ena omwe si a carbon komanso amapereka njira yodalirika yosinthira zinthu zolimba kukhala zotanuka kapena zosinthika popanga ma nanofibrous microstructures.

 

Post time: Mar-13-2020
 
 
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