{"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\/fi\/new-era-for-cnt\/","title":{"rendered":"CNT:n uusi aikakausi: CNT-mets\u00e4t: Uusi l\u00e4hestymistapa CNT-mets\u00e4n kasvattamiseen"},"content":{"rendered":"

Hiilinanoputket (carbon nanotube, CNT) ovat hiilen allotrooppeja, jotka ovat sylinterinmuotoisia hunajakennon muotoisia ja joiden halkaisija on nano. <\/p>\n\n\n\n

CNT:ll\u00e4 on lukuisia ominaisuuksia, kuten mekaaninen lujuus, elastisuus, keveys, s\u00e4hk\u00f6n- ja l\u00e4mm\u00f6njohtavuus, jotka tekev\u00e4t siit\u00e4 lupaavimman materiaalin. <\/p>\n\n\n\n

Monet teollisuudenalat, kuten elektroniikka, l\u00e4\u00e4ketiede, energian varastointi, anturit ja monet muut, hy\u00f6dynt\u00e4v\u00e4t CNT:t\u00e4 runsaasti. Kasvava kysynt\u00e4 on aiheuttanut jatkuvia paineita CNT:iden valmistuksen tehostamiselle. <\/p>\n\n\n\n

CNT:iden laajamittainen tuotanto on muodostunut suurimmaksi haasteeksi, joka haittaa niiden sovelluksia. <\/p>\n\n\n\n

Haasteeseen vastaaminen :<\/p>\n\n\n\n

Yleens\u00e4 tutkijat kasvattavat mieluummin CNT-metsi\u00e4 kuin kasvattavat niit\u00e4 yksitt\u00e4in. CNT-mets\u00e4t ovat pystysuoraan linjassa olevia CNT-massoja, jotka ovat itse koottuja. <\/p>\n\n\n\n

T\u00e4m\u00e4 tapahtuu yleens\u00e4 kemiallisella h\u00f6yrystysprosessilla, jossa substraatille on kiinnitetty katalyytti, joka my\u00f6hemmin erotetaan CNT-mets\u00e4st\u00e4, jotta saadaan eritt\u00e4in puhdasta materiaalia. <\/p>\n\n\n\n

Vaikka t\u00e4ss\u00e4 prosessissa on paljon hyvi\u00e4 puolia, ainoa suuri ongelma on sen pituus. <\/p>\n\n\n\n

T\u00e4h\u00e4n menness\u00e4 tutkijat ovat pystyneet kasvattamaan CNT-mets\u00e4\u00e4 jopa 2 cm:n pituiseksi k\u00e4ytt\u00e4m\u00e4ll\u00e4 katalyyttej\u00e4, kuten rautaa (Fe) alumiinioksidilla (Al2O3) (CNT:iden pituudella on ratkaiseva merkitys niiden ominaisuuksiin, joten t\u00e4m\u00e4 n\u00e4k\u00f6kohta on otettava huomioon). <\/p>\n\n\n\n

T\u00e4m\u00e4 vaikuttaa sen teolliseen arvoon rajoittamalla materiaalin tarjontaa ja nostamalla sen hintaa. <\/p>\n\n\n\n

On tehty vallankumouksellinen l\u00f6yt\u00f6, joka on muuttanut pelin t\u00e4ysin. <\/p>\n\n\n\n

Japanilainen tutkijaryhm\u00e4 on hiljattain rekister\u00f6inyt CNT-mets\u00e4n pituuden jopa 14 senttimetriin asti uudenlaisen l\u00e4hestymistavan avulla. Heid\u00e4n tutkimuksensa on julkaistu hiljattain Carbon-lehdess\u00e4. <\/p>\n\n\n\n

Wasedan yliopiston apulaisprofessori Hisashi Sugime ja h\u00e4nen ryhm\u00e4ns\u00e4 havaitsivat, ett\u00e4 CNT:t lakkasivat kasvamasta, koska aiemmin k\u00e4ytetyn katalyytin (Fe-Al2Ox) rakenne muuttui asteittain. <\/p>\n\n\n\n

Periaatteessa CNT:iden tiheys, joka riippuu aktiivisten katalyyttien m\u00e4\u00e4r\u00e4st\u00e4, ei riit\u00e4 yll\u00e4pit\u00e4m\u00e4\u00e4n itsekantavaa rakennetta, jolloin mets\u00e4n kasvu loppuu. <\/p>\n\n\n\n

Siksi k\u00e4ytetyn katalyytin on pysytt\u00e4v\u00e4 rakenteellisesti ja kemiallisesti stabiilina.  <\/p>\n\n\n\n

Heid\u00e4n l\u00e4hestymistapansa oli muuttaa tekniikkaa t\u00e4m\u00e4n ep\u00e4vakauden poistamiseksi. <\/p>\n\n\n\n

Se saavutettiin lis\u00e4\u00e4m\u00e4ll\u00e4 gadolinium (Gd)-kerros aikaisempaan katalyyttiin, joka oli p\u00e4\u00e4llystetty n-tyypin piisubstraatilla. <\/p>\n\n\n\n

Gadoliniumkerros auttoi est\u00e4m\u00e4\u00e4n katalysaattorin heikkenemist\u00e4 ja antoi puolestaan CNT-mets\u00e4n kasvaa 5 cm:n pituiseksi. <\/p>\n\n\n\n

Halutun pituuden saavuttamiseksi he pitiv\u00e4t katalyytti\u00e4 kammiossa, jota kutsutaan kylm\u00e4kaasukemialliseksi h\u00f6yrystyskammioksi (CVD-kammioksi). <\/p>\n\n\n\n

Katalyytti esik\u00e4siteltiin pit\u00e4m\u00e4ll\u00e4 l\u00e4mp\u00f6tila 750 \u00b0C:ssa ja sy\u00f6tt\u00e4m\u00e4ll\u00e4 pieni\u00e4 pitoisuuksia Fe- ja Al-h\u00f6yryj\u00e4 huoneenl\u00e4mp\u00f6tilassa. <\/p>\n\n\n\n

T\u00e4m\u00e4 auttoi s\u00e4ilytt\u00e4m\u00e4\u00e4n katalyytin rakenteen jopa 26 tuntia, mik\u00e4 puolestaan edisti CNT-mets\u00e4n kasvua. <\/p>\n\n\n\n

Huolellisten analyysien j\u00e4lkeen he pystyiv\u00e4t onnistuneesti kirjaamaan CNT-mets\u00e4n pituuden 14 cm:iin. <\/p>\n\n\n\n

T\u00e4m\u00e4 merkitt\u00e4v\u00e4 edistysaskel on laajentanut CNT:iden k\u00e4ytt\u00f6mahdollisuuksia. <\/p>\n\n\n\n

Se voi muuttaa l\u00e4hestymistapaa nanoteknologiaan ja nanotieteeseen tulevassa tutkimuksessa. <\/p>\n\n\n\n

Voit lukea julkaistun tutkimusartikkelin kokonaisuudessaan alla olevasta DOI-osoitteesta. <\/p>\n\n\n\n

Viite :<\/p>\n\n\n\n

Hisashi Sugime, Toshihiro Sato, Rei Nakagawa, Tatsuhiro Hayashi, Yoku Inoue, Suguru Noda. Eritt\u00e4in pitk\u00e4t hiilinanoputkimets\u00e4t rauta- ja alumiinih\u00f6yryl\u00e4hteiden in situ -lis\u00e4yksill\u00e4. Hiili<\/strong>, 2020; https:\/\/doi.org\/10.1016\/j.carbon.2020.10.066<\/a><\/p>\n\n\n\n

Jos olet nanoteknologian alan tutkija, voimme auttaa sinua luomaan infografiikoita aiheeseen liittyvist\u00e4 Mind the graph -aiheista. <\/p>","protected":false},"excerpt":{"rendered":"

Hiilinanoputket (carbon nanotube, CNT) ovat hiilen allotrooppeja, jotka ovat sylinterinmuotoisia hunajakennon muotoisia ja joiden halkaisija on nano. CNT:ll\u00e4 on lukuisia ominaisuuksia, kuten mekaaninen lujuus, elastisuus, keveys, s\u00e4hk\u00f6n- ja l\u00e4mm\u00f6njohtavuus, jotka tekev\u00e4t siit\u00e4 lupaavimman materiaalin. Monet teollisuudenalat, kuten elektroniikka, l\u00e4\u00e4ketiede, energian varastointi, anturit ja monet muut, hy\u00f6dynt\u00e4v\u00e4t CNT:t\u00e4 runsaasti. Kasvava [...]<\/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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