Loaʻa i ka graphite kiʻekiʻe ka ikaika mechanical maikaʻi loa, ke kūpaʻa thermal, ke kūlou kiʻekiʻe a me ke conductivity thermal a me ka uila kiʻekiʻe loa i loko o ka mokulele, e lilo ia i kekahi o nā mea holomua koʻikoʻi no nā noi he nui e like me nā alakaʻi photothermal i hoʻohana ʻia e like me nā pila ma nā kelepona. No ka laʻana, ʻo kahi ʻano graphite kūikawā, ʻo ka graphite pyrolytic i kauoha nui ʻia (HOPG), ʻo ia kekahi o nā mea i hoʻohana pinepine ʻia i nā keʻena hoʻokolohua. Mea. ʻO kēia mau waiwai maikaʻi loa ma muli o ke ʻano papa o ka graphite, kahi e hāʻawi ai nā pilina covalent ikaika ma waena o nā ʻātoma kalapona i nā papa graphene i nā waiwai mechanical maikaʻi loa, ka conductivity thermal a me ka uila, ʻoiai he liʻiliʻi loa ka launa pū ʻana ma waena o nā papa graphene. Hoʻopuka ka hana i kahi kiʻekiʻe o ka maʻalahi. graphite. ʻOiai ua ʻike ʻia ka graphite ma ke ʻano no nā makahiki he 1000 a ua aʻo ʻia kāna synthesis artificial no nā makahiki he 100 a ʻoi, ʻo ke ʻano o nā laʻana graphite, ʻo ke kūlohelohe a me ka synthetic, ʻaʻole ia he kūpono. No ka laʻana, ʻo ka nui o nā kikowaena graphite kristal hoʻokahi nui loa i nā mea graphite he emi ma mua o 1 mm, kahi ʻokoʻa loa i ka nui o nā kristal he nui e like me nā kristal hoʻokahi quartz a me nā kristal hoʻokahi silicon. Hiki i ka nui ke hiki i ka unahi o ka mika. ʻO ka liʻiliʻi loa o ka graphite kristal hoʻokahi ma muli o ka launa pū ʻana o nā papa graphite, a he paʻakikī ke mālama i ka pālahalaha o ka papa graphene i ka wā ulu, no laila ua maʻalahi ka haki ʻana o ka graphite i kekahi mau palena hua kristal hoʻokahi i ka wā e hoʻopilikia ʻia ai. . No ka hoʻoponopono ʻana i kēia pilikia koʻikoʻi, ua hāpai ʻo Polofesa Emeritus o ka Ulsan National Institute of Science and Technology (UNIST) a me kāna mau hoa hana ʻo Prof. Liu Kaihui, Prof. Wang Enge o ke Kulanui ʻo Peking, a me nā mea ʻē aʻe i kahi hoʻolālā no ka hana ʻana i nā kristal hoʻokahi graphite lahilahi. kiʻiʻoniʻoni, a hiki i ka unahi ʻīniha. Hoʻohana kā lākou ʻano hana i kahi foil nickel kristal hoʻokahi ma ke ʻano he substrate, a hānai ʻia nā ʻātoma kalapona mai ke kua o ka foil nickel ma o kahi "kaʻina hana hoʻoheheʻe-hoʻokaʻawale-hoʻokaʻawale isothermal". Ma kahi o ka hoʻohana ʻana i kahi kumu pepa kinoea, ua koho lākou i kahi mea kalapona paʻa e hoʻomaʻamaʻa i ka ulu ʻana o ka graphite. ʻO kēia hoʻolālā hou e hiki ai ke hana i nā kiʻiʻoniʻoni graphite kristal hoʻokahi me ka mānoanoa o kahi 1 ʻīniha a me 35 microns, a ʻoi aku paha ma mua o 100,000 mau papa graphene i loko o kekahi mau lā. Ke hoʻohālikelike ʻia me nā laʻana graphite āpau i loaʻa, ʻo ka graphite kristal hoʻokahi he conductivity thermal o ~2880 W m-1K-1, kahi ʻike liʻiliʻi o nā haumia, a me ka mamao liʻiliʻi ma waena o nā papa. (1) ʻO ka synthesis holomua o nā kiʻiʻoniʻoni nickel kristal hoʻokahi o ka nui nui e like me nā substrates ultra-flat e pale aku i ka hoʻopilikia ʻana o ka graphite synthetic; (2) Hoʻoulu ʻia nā papa graphene he 100,000 isothermally ma kahi o 100 mau hola, i hiki ai i kēlā me kēia papa o ka graphene ke synthesized i loko o ke kaiapuni kemika like a me ka mahana, e hōʻoiaʻiʻo ana i ka maikaʻi like o ka graphite; (3) ʻO ka hoʻolako mau ʻana o ke kalapona ma o ka ʻaoʻao hope o ka pepa nickel e ʻae i nā papa o ka graphene e ulu mau i kahi wikiwiki loa, ma kahi o hoʻokahi papa i kēlā me kēia ʻelima kekona.
Ka manawa hoʻouna: Nov-09-2022