{"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\/sk\/new-era-for-cnt\/","title":{"rendered":"Nov\u00e1 \u00e9ra pre CNT: Nov\u00fd pr\u00edstup k pestovaniu CNT lesov"},"content":{"rendered":"

Uhl\u00edkov\u00e9 nanor\u00farky (CNT) s\u00fa alotropy uhl\u00edka, ktor\u00e9 maj\u00fa tvar valcovej v\u010delie pl\u00e1sty s nanopriemerom. <\/p>\n\n\n\n

CNT maj\u00fa mno\u017estvo vlastnost\u00ed, ako je mechanick\u00e1 pevnos\u0165, pru\u017enos\u0165, n\u00edzka hmotnos\u0165, elektrick\u00e1 a tepeln\u00e1 vodivos\u0165, ktor\u00e9 z nich robia najs\u013eubnej\u0161\u00ed materi\u00e1l. <\/p>\n\n\n\n

CNT sa vo ve\u013ekom vyu\u017e\u00edvaj\u00fa v mnoh\u00fdch priemyseln\u00fdch odvetviach vr\u00e1tane elektroniky, medic\u00edny, skladovania energie, senzorov a mnoh\u00fdch \u010fal\u0161\u00edch. Zvy\u0161uj\u00faci sa dopyt vytv\u00e1ra neust\u00e1ly tlak na zvy\u0161ovanie v\u00fdroby CNT. <\/p>\n\n\n\n

T\u00e1to ve\u013ekov\u00fdroba CNT sa stala hlavnou v\u00fdzvou, ktor\u00e1 br\u00e1ni ich aplik\u00e1ci\u00e1m. <\/p>\n\n\n\n

Rie\u0161enie v\u00fdzvy :<\/p>\n\n\n\n

Vedci zvy\u010dajne uprednost\u0148uj\u00fa pestovanie lesov CNT pred ich individu\u00e1lnym pestovan\u00edm. Lesy CNT s\u00fa vertik\u00e1lne usporiadan\u00e9 polia CNT, ktor\u00e9 sa zostavuj\u00fa samy. <\/p>\n\n\n\n

Zvy\u010dajne sa to vykon\u00e1va procesom chemickej depoz\u00edcie z plynnej f\u00e1zy za pr\u00edtomnosti pevn\u00e9ho katalyz\u00e1tora na substr\u00e1te, ktor\u00fd sa nesk\u00f4r oddel\u00ed od lesa CNT, aby sa z\u00edskal vysoko \u010dist\u00fd materi\u00e1l. <\/p>\n\n\n\n

Hoci tento proces pon\u00faka mno\u017estvo v\u00fdhod, jedin\u00fdm z\u00e1va\u017en\u00fdm probl\u00e9mom je jeho d\u013a\u017eka. <\/p>\n\n\n\n

Doteraz sa v\u00fdskumn\u00edkom podarilo vypestova\u0165 les CNT a\u017e do d\u013a\u017eky 2 cm pomocou katalyz\u00e1torov, ako je \u017eelezo (Fe) na nosi\u010di z oxidu hlinit\u00e9ho (Al2O3) (d\u013a\u017eka CNT hr\u00e1 z\u00e1sadn\u00fa \u00falohu, pokia\u013e ide o ich vlastnosti, preto je potrebn\u00e9 zoh\u013eadni\u0165 tento aspekt). <\/p>\n\n\n\n

To ovplyv\u0148uje jeho priemyseln\u00fa hodnotu t\u00fdm, \u017ee obmedzuje ponuku a zvy\u0161uje n\u00e1klady na materi\u00e1l. <\/p>\n\n\n\n

Do\u0161lo k revolu\u010dn\u00e9mu objavu, ktor\u00fd \u00faplne zmenil pravidl\u00e1 hry. <\/p>\n\n\n\n

Ned\u00e1vno t\u00edm vedcov z Japonska zaznamenal pomocou nov\u00e9ho pr\u00edstupu d\u013a\u017eku CNT lesa a\u017e 14 cm. Ich \u0161t\u00fadia bola ned\u00e1vno uverejnen\u00e1 v \u010dasopise Carbon. <\/p>\n\n\n\n

Hisashi Sugime, odborn\u00fd asistent na Waseda University, a jeho t\u00edm zistili, \u017ee CNT prestali r\u00e1s\u0165 v d\u00f4sledku postupnej \u0161truktur\u00e1lnej zmeny v katalyz\u00e1tore (Fe-Al2Ox), ktor\u00fd sa predt\u00fdm pou\u017e\u00edval. <\/p>\n\n\n\n

Ak hustota CNT, ktor\u00e1 z\u00e1vis\u00ed od po\u010dtu akt\u00edvnych katalyz\u00e1torov, v podstate neposta\u010duje na udr\u017eanie samonosnej \u0161trukt\u00fary, rast lesa sa ukon\u010d\u00ed. <\/p>\n\n\n\n

Preto mus\u00ed by\u0165 pou\u017eit\u00fd katalyz\u00e1tor \u0161truktur\u00e1lne a chemicky stabiln\u00fd.  <\/p>\n\n\n\n

Ich pr\u00edstup spo\u010d\u00edval v zmene techniky na potla\u010denie tejto nestability. <\/p>\n\n\n\n

Dosiahli to pridan\u00edm vrstvy gadol\u00ednia (Gd) do predch\u00e1dzaj\u00faceho katalyz\u00e1tora potiahnut\u00e9ho krem\u00edkov\u00fdm substr\u00e1tom typu n. <\/p>\n\n\n\n

Gadol\u00edniov\u00e1 vrstva pomohla zabr\u00e1ni\u0165 po\u0161kodeniu katalyz\u00e1tora a umo\u017enila rast lesa CNT o 5 cm. <\/p>\n\n\n\n

Na dosiahnutie po\u017eadovanej d\u013a\u017eky \u010falej udr\u017eiavali katalyz\u00e1tor v komore naz\u00fdvanej komora na chemick\u00e9 naparovanie (CVD). <\/p>\n\n\n\n

Katalyz\u00e1tor bol pred\u00fapraven\u00fd udr\u017eiavan\u00edm teploty do 750 \u00b0C a dod\u00e1van\u00edm mal\u00fdch koncentr\u00e1ci\u00ed p\u00e1r Fe a Al pri izbovej teplote. <\/p>\n\n\n\n

To pomohlo udr\u017ea\u0165 \u0161trukt\u00faru katalyz\u00e1tora a\u017e 26 hod\u00edn, \u010do n\u00e1sledne podporilo rast lesa CNT. <\/p>\n\n\n\n

Po d\u00f4kladn\u00fdch anal\u00fdzach sa im podarilo zaznamena\u0165 d\u013a\u017eku lesa CNT 14 cm. <\/p>\n\n\n\n

Tento pozoruhodn\u00fd pokrok roz\u0161\u00edril mo\u017enosti vyu\u017eitia CNT. <\/p>\n\n\n\n

Mohlo by to zmeni\u0165 pr\u00edstup k nanotechnol\u00f3gi\u00e1m a nanovede pre bud\u00faci v\u00fdskum. <\/p>\n\n\n\n

Ak si chcete pre\u010d\u00edta\u0165 cel\u00fd uverejnen\u00fd v\u00fdskumn\u00fd \u010dl\u00e1nok, pozrite si DOI ni\u017e\u0161ie. <\/p>\n\n\n\n

Odkaz :<\/p>\n\n\n\n

Hisashi Sugime, Toshihiro Sato, Rei Nakagawa, Tatsuhiro Hayashi, Yoku Inoue, Suguru Noda. Ultra-dlh\u00fd les uhl\u00edkov\u00fdch nanor\u00farok prostredn\u00edctvom in situ doplnkov z parn\u00fdch zdrojov \u017eeleza a hlin\u00edka. Uhl\u00edk<\/strong>, 2020; https:\/\/doi.org\/10.1016\/j.carbon.2020.10.066<\/a><\/p>\n\n\n\n

Ak ste v\u00fdskumn\u00edk z oblasti nanotechnol\u00f3gi\u00ed, m\u00f4\u017eeme v\u00e1m pom\u00f4c\u0165 vytvori\u0165 infografiku na s\u00favisiace t\u00e9my v programe Mind the graph. <\/p>","protected":false},"excerpt":{"rendered":"

Uhl\u00edkov\u00e9 nanor\u00farky (CNT) s\u00fa alotropy uhl\u00edka, ktor\u00e9 maj\u00fa tvar valcovej v\u010delie pl\u00e1sty s nanopriemerom. CNT maj\u00fa mno\u017estvo vlastnost\u00ed, ako je mechanick\u00e1 pevnos\u0165, pru\u017enos\u0165, n\u00edzka hmotnos\u0165, elektrick\u00e1 a tepeln\u00e1 vodivos\u0165, ktor\u00e9 z nich robia najs\u013eubnej\u0161\u00ed materi\u00e1l. CNT sa vo ve\u013ekom vyu\u017e\u00edvaj\u00fa v mnoh\u00fdch priemyseln\u00fdch odvetviach vr\u00e1tane elektroniky, medic\u00edny, skladovania energie, senzorov a mnoh\u00fdch \u010fal\u0161\u00edch. Rast\u00faci podiel CNT na celkovom [...]<\/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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