{"id":11998,"date":"2020-12-07T10:07:19","date_gmt":"2020-12-07T12:07:19","guid":{"rendered":"https:\/\/mindthegraph.com\/blog\/?p=11998"},"modified":"2023-01-05T14:32:34","modified_gmt":"2023-01-05T17:32:34","slug":"new-era-for-cnt","status":"publish","type":"post","link":"https:\/\/mindthegraph.com\/blog\/hu\/new-era-for-cnt\/","title":{"rendered":"A CNT-k \u00faj korszaka: A CNT-erd\u0151k n\u00f6veked\u00e9s\u00e9nek \u00faj megk\u00f6zel\u00edt\u00e9se"},"content":{"rendered":"

A sz\u00e9n nanocs\u00f6vek (CNT) a sz\u00e9n olyan allotropjai, amelyek hengeres, m\u00e9hsejt alak\u00faak, nano \u00e1tm\u00e9r\u0151j\u0171ek. <\/p>\n\n\n\n

A CNT-knek sz\u00e1mos tulajdons\u00e1ga van, mint p\u00e9ld\u00e1ul mechanikai szil\u00e1rds\u00e1g, rugalmass\u00e1g, k\u00f6nny\u0171 s\u00faly, elektromos \u00e9s h\u0151vezet\u0151 k\u00e9pess\u00e9g, ami a leg\u00edg\u00e9retesebb anyagg\u00e1 teszi. <\/p>\n\n\n\n

Sz\u00e1mos ipar\u00e1g, k\u00f6zt\u00fck az elektronika, az orvostudom\u00e1ny, az energiat\u00e1rol\u00e1s, az \u00e9rz\u00e9kel\u0151k \u00e9s m\u00e9g sok m\u00e1s ipar\u00e1g haszn\u00e1lja nagy sz\u00e1mban a CNT-ket. A n\u00f6vekv\u0151 kereslet folyamatos nyom\u00e1st gyakorol a CNT-k gy\u00e1rt\u00e1s\u00e1nak n\u00f6vel\u00e9s\u00e9re. <\/p>\n\n\n\n

A CNT-k nagy\u00fczemi el\u0151\u00e1ll\u00edt\u00e1sa v\u00e1lt a f\u0151 kih\u00edv\u00e1ss\u00e1, amely akad\u00e1lyozza alkalmaz\u00e1sukat. <\/p>\n\n\n\n

A kih\u00edv\u00e1s kezel\u00e9se :<\/p>\n\n\n\n

A tud\u00f3sok \u00e1ltal\u00e1ban ink\u00e1bb CNT-erd\u0151ket termesztenek, minthogy egyenk\u00e9nt termessz\u00e9k \u0151ket. A CNT-erd\u0151k f\u00fcgg\u0151legesen egym\u00e1s mell\u00e9 rendezett CNT-t\u00f6mb\u00f6k, amelyek \u00f6nmagukban \u00e1llnak \u00f6ssze. <\/p>\n\n\n\n

Ezt \u00e1ltal\u00e1ban k\u00e9miai g\u0151zf\u00e1zis\u00fa lev\u00e1laszt\u00e1ssal v\u00e9gzik egy hordoz\u00f3n r\u00f6gz\u00edtett kataliz\u00e1tor jelenl\u00e9t\u00e9ben, amelyet k\u00e9s\u0151bb lev\u00e1lasztanak a CNT-erd\u0151b\u0151l, hogy nagy tisztas\u00e1g\u00fa anyagot kapjanak. <\/p>\n\n\n\n

B\u00e1r ez az elj\u00e1r\u00e1s sz\u00e1mos el\u0151nnyel j\u00e1r, az egyetlen nagyobb probl\u00e9ma, amivel szembe kell n\u00e9zni, az a hossza. <\/p>\n\n\n\n

Eddig a kutat\u00f3k k\u00e9pesek voltak ak\u00e1r 2 cm-es CNT-erd\u0151t n\u00f6veszteni olyan kataliz\u00e1torok seg\u00edts\u00e9g\u00e9vel, mint a vas (Fe) alum\u00ednium-oxid (Al2O3) hordoz\u00f3n (a CNT-k hossza d\u00f6nt\u0151 szerepet j\u00e1tszik a tulajdons\u00e1gaik szempontj\u00e1b\u00f3l, ez\u00e9rt sz\u00fcks\u00e9ges figyelembe venni ezt a szempontot). <\/p>\n\n\n\n

Ez befoly\u00e1solja az ipari \u00e9rt\u00e9k\u00e9t az\u00e1ltal, hogy korl\u00e1tozza a k\u00edn\u00e1latot \u00e9s n\u00f6veli az anyag k\u00f6lts\u00e9geit. <\/p>\n\n\n\n

T\u00f6rt\u00e9nt egy forradalmi felfedez\u00e9s, amely teljesen megv\u00e1ltoztatta a j\u00e1t\u00e9kot. <\/p>\n\n\n\n

A k\u00f6zelm\u00faltban egy jap\u00e1n tud\u00f3scsoport \u00fajszer\u0171 megk\u00f6zel\u00edt\u00e9ssel ak\u00e1r 14 cm hossz\u00fas\u00e1g\u00fa CNT-erd\u0151t is r\u00f6gz\u00edtett. Tanulm\u00e1nyukat a Carbon c\u00edm\u0171 szaklapban tett\u00e9k k\u00f6zz\u00e9 a k\u00f6zelm\u00faltban. <\/p>\n\n\n\n

Hisashi Sugime, a Waseda Egyetem adjunktusa \u00e9s csapata r\u00e1j\u00f6tt, hogy a CNT-k n\u00f6veked\u00e9se a kor\u00e1bban haszn\u00e1lt kataliz\u00e1tor (Fe-Al2Ox) fokozatos szerkezeti v\u00e1ltoz\u00e1sa miatt \u00e1llt le. <\/p>\n\n\n\n

Alapvet\u0151en a CNT-k s\u0171r\u0171s\u00e9ge, amely az akt\u00edv kataliz\u00e1torok sz\u00e1m\u00e1t\u00f3l f\u00fcgg, nem elegend\u0151 az \u00f6nhord\u00f3 szerkezet fenntart\u00e1s\u00e1hoz, az erd\u0151 n\u00f6veked\u00e9se megsz\u0171nik. <\/p>\n\n\n\n

Ez\u00e9rt a felhaszn\u00e1lt kataliz\u00e1tornak szerkezetileg \u00e9s k\u00e9miailag stabilnak kell maradnia.  <\/p>\n\n\n\n

A megk\u00f6zel\u00edt\u00e9s\u00fck az volt, hogy megv\u00e1ltoztatt\u00e1k a technik\u00e1t, hogy elnyomj\u00e1k ezt az instabilit\u00e1st. <\/p>\n\n\n\n

Ezt \u00fagy \u00e9rt\u00e9k el, hogy a gadol\u00ednium (Gd) r\u00e9teget a kor\u00e1bbi, n-t\u00edpus\u00fa szil\u00edcium szubsztr\u00e1tra bevont kataliz\u00e1torhoz adt\u00e1k hozz\u00e1. <\/p>\n\n\n\n

A gadol\u00edniumr\u00e9teg seg\u00edtett megakad\u00e1lyozni a kataliz\u00e1tor roml\u00e1s\u00e1t, \u00e9s ezzel lehet\u0151v\u00e9 tette a CNT-erd\u0151 5 cm-es n\u00f6veked\u00e9s\u00e9t. <\/p>\n\n\n\n

A k\u00edv\u00e1nt hossz\u00fas\u00e1g el\u00e9r\u00e9se \u00e9rdek\u00e9ben a kataliz\u00e1tort egy hidegg\u00e1zos k\u00e9miai g\u0151zf\u00e1zis\u00fa lev\u00e1laszt\u00e1snak (CVD) nevezett kamr\u00e1ban tartott\u00e1k. <\/p>\n\n\n\n

A kataliz\u00e1tor el\u0151kezel\u00e9se \u00fagy t\u00f6rt\u00e9nt, hogy a h\u0151m\u00e9rs\u00e9kletet 750 \u00b0C-ig tartott\u00e1k, \u00e9s szobah\u0151m\u00e9rs\u00e9kleten kis koncentr\u00e1ci\u00f3j\u00fa Fe- \u00e9s Al-g\u0151z\u00f6ket bocs\u00e1tottak rendelkez\u00e9sre. <\/p>\n\n\n\n

Ez 26 \u00f3r\u00e1n kereszt\u00fcl seg\u00edtette a kataliz\u00e1tor szerkezet\u00e9nek fenntart\u00e1s\u00e1t, ami viszont el\u0151seg\u00edtette a CNT-erd\u0151 n\u00f6veked\u00e9s\u00e9t. <\/p>\n\n\n\n

Gondos elemz\u00e9sek ut\u00e1n sikeresen r\u00f6gz\u00edtett\u00e9k a CNT-erd\u0151 hossz\u00e1t 14 cm-rel. <\/p>\n\n\n\n

Eredm\u00e9nyeik \u00faj t\u00e1vlatokat nyitottak a fejl\u0151d\u0151 ipar\u00e1gak sz\u00e1m\u00e1ra.Ez a figyelemre m\u00e9lt\u00f3 fejl\u0151d\u00e9s kisz\u00e9les\u00edtette a CNT-k alkalmaz\u00e1si szempontjait. <\/p>\n\n\n\n

Ez megv\u00e1ltoztathatja a nanotechnol\u00f3gia \u00e9s a nanotudom\u00e1nyok megk\u00f6zel\u00edt\u00e9s\u00e9t a j\u00f6v\u0151beli kutat\u00e1sokban. <\/p>\n\n\n\n

A teljes kutat\u00e1si cikk az al\u00e1bbi DOI-n olvashat\u00f3. <\/p>\n\n\n\n

Hivatkoz\u00e1s :<\/p>\n\n\n\n

Hisashi Sugime, Toshihiro Sato, Rei Nakagawa, Tatsuhiro Hayashi, Yoku Inoue, Suguru Noda. Ultrahossz\u00fa sz\u00e9n nanocs\u00f6vek erdeje vas- \u00e9s alum\u00edniumg\u0151zforr\u00e1sok in situ kieg\u00e9sz\u00edt\u00e9s\u00e9vel. Sz\u00e9n<\/strong>, 2020; https:\/\/doi.org\/10.1016\/j.carbon.2020.10.066<\/a><\/p>\n\n\n\n

Ha \u00d6n kutat\u00f3 a nanotechnol\u00f3gia ter\u00fclet\u00e9n, seg\u00edt\u00fcnk \u00d6nnek infografik\u00e1kat k\u00e9sz\u00edteni a Mind the graph kapcsol\u00f3d\u00f3 t\u00e9m\u00e1ir\u00f3l. <\/p>","protected":false},"excerpt":{"rendered":"

A sz\u00e9n nanocs\u00f6vek (CNT) a sz\u00e9n olyan allotropjai, amelyek hengeres, m\u00e9hsejt alak\u00faak, nano \u00e1tm\u00e9r\u0151j\u0171ek. A CNT-knek sz\u00e1mos tulajdons\u00e1ga van, mint p\u00e9ld\u00e1ul mechanikai szil\u00e1rds\u00e1g, rugalmass\u00e1g, k\u00f6nny\u0171 s\u00faly, elektromos \u00e9s h\u0151vezet\u0151 k\u00e9pess\u00e9g, ami a leg\u00edg\u00e9retesebb anyagg\u00e1 teszi. Sz\u00e1mos ipar\u00e1g, k\u00f6zt\u00fck az elektronika, az orvostudom\u00e1ny, az energiat\u00e1rol\u00e1s, az \u00e9rz\u00e9kel\u0151k \u00e9s m\u00e9g sok m\u00e1s ipar\u00e1g haszn\u00e1lja nagy sz\u00e1mban a CNT-ket. A n\u00f6vekv\u0151 [...]<\/p>","protected":false},"author":4,"featured_media":11999,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[959],"tags":[554],"yoast_head":"\nNew Era for CNTs: A New Approach to Grow the CNT Forests MTG<\/title>\n<meta name=\"description\" content=\"Read this blog to get an idea of what is the new way of growing CNT forests. 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He has a Ph.D. and solid scientific background in Psychopharmacology and experience as a Guest Researcher at the Max Planck Institute of Psychiatry (Germany) and Researcher in D'Or Institute for Research and Education (IDOR, Brazil). Fabricio holds over 2500 citations in Google Scholar. He has 10 years of experience in small innovative businesses, with relevant experience in product design and innovation management. 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