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Hoʻomohala nā mea noiʻi Kina i nā aerogels superelastic hard carbon nanofiber


Hoʻoulu ʻia e ka maʻalahi a me ka paʻakikī o nā punawelewele silika spider maoli, ua hoʻomohala kahi hui noiʻi i alakaʻi ʻia e Prof. YU Shuhong mai ke Kulanui o ʻEpekema a me ʻenehana o Kina (USTC) i kahi ala maʻalahi a maʻamau e hana ai i ka superelastic a me ka luhi kūpaʻa a me ka nanofibrous. ka hoʻohana ʻana i ka resin resorcinol-formaldehyde ma ke ʻano he kumu kalapona paʻakikī.

Chinese researchers develop superelastic hard carbon nanofiber aerogels1

I nā makahiki i hala iho nei, ua ʻimi nui ʻia nā carbon aerogels ma o ka hoʻohana ʻana i nā kalapona graphitic a me nā kalapona palupalu, e hōʻike ana i nā pono o ka superelasticity. He mau microstructure maʻalahi kēia mau aerogels elastic me ke kūpaʻa luhi maikaʻi akā ka ikaika ultralow. Hōʻike nā kalapona paʻakikī i nā mea maikaʻi loa i ka ikaika mechanical a me ka paʻa o ke kūkulu ʻana ma muli o ka sp3 C-induced turbostratic "house-of-cards" structure. Eia nō naʻe, ʻo ka ʻoʻoleʻa a me ka palupalu e loaʻa i ke ala e loaʻa ai ka superelasticity me nā kalapona paʻakikī. A hiki i kēia manawa, paʻakikī ka hana ʻana i nā aerogels paʻa kalapona paʻakikī superelastic.

Ua hoʻomaka ʻia ka polymerization o nā monomers resin i mua o nā nanofibers e like me ka hoʻomākaukau ʻana i kahi hydrogel me nā pūnaewele nanofibrous, a ukali ʻia e ka maloʻo a me ka pyrolysis e kiʻi i ka carbon aerogel paʻakikī. I ka wā o ka polymerization, waiho nā monomers ma luna o nā templates a wili i nā hui fiber-fiber, me ka waiho ʻana i kahi hoʻolālā pūnaewele maʻamau me nā hui ikaika nui. Eia kekahi, hiki ke hoʻomalu ʻia nā waiwai kino (e like me nā anawaena o nanofiber, density of aerogels, a me nā waiwai mechanical) me ka hoʻolohe wale ʻana i nā templates a me ka nui o nā mea maka.

Ma muli o ke kalapona nanofibers paʻakikī a me ka nui o nā hui welded ma waena o nā nanofibers, hōʻike nā carbon aerogels paʻa i nā hana mechanical ikaika a paʻa, me ka super-elasticity, ka ikaika kiʻekiʻe, ka wikiwiki hoʻihoʻi wikiwiki loa (860 mm s-1) a me ka helu haʻahaʻa haʻahaʻa. <0.16). Ma hope o ka hoʻāʻo ʻana ma lalo o 50% kānana no 104 mau pōʻai, hōʻike ka carbon airgel i 2% wale nō ka hoʻololi ʻana i ka plastic, a mālama ʻia he 93% koʻikoʻi kumu.

Hiki i ka airgel carbon paʻakikī ke mālama i ka super-elasticity i nā kūlana paʻakikī, e like me ka nitrogen wai. Hoʻokumu ʻia i nā waiwai mechanical hoihoi, ua hoʻohiki kēia airgel carbon paʻakikī i ka hoʻohana ʻana i nā mea ʻike koʻikoʻi me ka paʻa kiʻekiʻe a me ka laulā detective ākea (50 KPa), a me nā mea hoʻokele hikiwawe a hiki ke hoʻopaʻa ʻia. Mālama kēia ala i ka ʻōlelo hoʻohiki e hoʻonui ʻia e hana i nā nanofibers composite non-carbon a hāʻawi i kahi ala hoʻohiki no ka hoʻololi ʻana i nā mea paʻa i nā mea elastic a maʻalahi paha ma ka hoʻolālā ʻana i nā microstructures nanofibrous.

 

Post time: Mar-13-2020
 
 
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