{"id":28623,"date":"2019-02-20T19:31:00","date_gmt":"2019-02-20T12:31:00","guid":{"rendered":"https:\/\/ttud.com.vn\/?p=28623"},"modified":"2021-10-03T19:33:21","modified_gmt":"2021-10-03T12:33:21","slug":"che-tao-thanh-cong-vat-lieu-cach-nhiet-sieu-nhe","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/che-tao-thanh-cong-vat-lieu-cach-nhiet-sieu-nhe\/","title":{"rendered":"Ch\u1ebf t\u1ea1o th\u00e0nh c\u00f4ng v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t si\u00eau nh\u1eb9"},"content":{"rendered":"\n

C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ch\u1ebf t\u1ea1o th\u00e0nh c\u00f4ng m\u1ed9t lo\u1ea1i ch\u1ea5t c\u00e1ch nhi\u1ec7t m\u1edbi, g\u1ea7n nh\u01b0 kh\u00f4ng tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 c\u00f3 \u0111\u1ed9 b\u1ec1n nhi\u1ec7t cao h\u01a1n h\u1ea7u h\u1ebft v\u1eadt li\u1ec7u kh\u00e1c.\u00a0<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

<\/a>Th\u00ed nghi\u1ec7m cho th\u1ea5y t\u00ednh c\u00e1ch nhi\u1ec7t r\u1ea5t cao c\u1ee7a v\u1eadt li\u1ec7u m\u1edbi. \u1ea2nh: X. Xu Et Al\/Science 2019.V\u1eadt li\u1ec7u m\u1edbi c\u00f3 c\u1ea5u tr\u00fac aerogel (\u00edt nh\u1ea5t 99 ph\u1ea7n tr\u0103m kh\u00f4ng gian tr\u1ed1ng), t\u1ea1o th\u00e0nh t\u1eeb m\u1ed9t lo\u1ea1i g\u1ed1m nguy\u00ean t\u1eed si\u00eau m\u1ecfng (hexagonal boron nitride). Thi\u1ebft k\u1ebf n\u00e0y ch\u1ee9ng minh \u0111\u1ed9 b\u1ec1n nhi\u1ec7t c\u1ef1c k\u1ef3 cao v\u00e0 s\u1ef1 bi\u1ebfn \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 r\u1ea5t nhanh trong ph\u1ea1m vi h\u01a1n 1.000 \u0111\u1ed9 C, c\u00e1c nh\u00e0 khoa h\u1ecdc b\u00e1o c\u00e1o trong t\u1eadp san Science ng\u00e0y 15 th\u00e1ng 2.<\/p>\n\n\n\n

\u201cR\u1ea5t kh\u00f3 \u0111\u1ec3 t\u1ea1o ra c\u00e1c v\u1eadt li\u1ec7u v\u1eeba nh\u1eb9 v\u1eeba c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t cao\u201d, Deep Jariwala, k\u1ef9 s\u01b0 t\u1ea1i \u0110\u1ea1i h\u1ecdc Pennsylvania, \u0111\u1ed3ng t\u00e1c gi\u1ea3 m\u1ed9t b\u00e0i nh\u1eadn x\u00e9t v\u1ec1 nghi\u00ean c\u1ee9u t\u01b0\u01a1ng \u0111\u01b0\u01a1ng tr\u00ean t\u1eadp san Science cho bi\u1ebft. Ch\u1ea5t c\u00e1ch nhi\u1ec7t si\u00eau nh\u1eb9 m\u1edbi c\u00f3 nhi\u1ec1u ti\u1ec1m n\u0103ng \u0111\u1ec3 l\u00e0m l\u1edbp ph\u1ee7 tr\u00ean c\u00e1c b\u1ed9 ph\u1eadn t\u00e0u v\u0169 tr\u1ee5, do ch\u00fang ph\u1ea3i ch\u1ecbu \u0111\u1ef1ng s\u1ef1 bi\u1ebfn thi\u00ean nhi\u1ec7t r\u1ea5t cao khi bay qua m\u1eb7t tr\u1eddi ho\u1eb7c quay tr\u1edf l\u1ea1i b\u1ea7u kh\u00ed quy\u1ec3n Tr\u00e1i \u0111\u1ea5t, \u00f4ng n\u00f3i.<\/p>\n\n\n\n

C\u1ea5u tr\u00fac aerogel g\u1ed3m m\u1ed9t m\u1ea1ng l\u01b0\u1edbi c\u00e1c bong b\u00f3ng kh\u00ed nh\u1ecf, m\u1ed7i bong b\u00f3ng \u0111\u01b0\u1ee3c ng\u0103n c\u00e1ch v\u1edbi nhau b\u1eb1ng hai l\u1edbp nguy\u00ean t\u1eed Bo (nguy\u00ean t\u1ed1 \u00e1 kim h\u00f3a tr\u1ecb 3) nitrat h\u00f3a, h\u00ecnh l\u1ee5c gi\u00e1c. Gi\u1ed1ng nh\u01b0 c\u00e1ch m\u00e0 c\u1eeda s\u1ed5 hai l\u1edbp ng\u0103n nhi\u1ec7t tho\u00e1t ra kh\u1ecfi nh\u00e0 v\u00e0o m\u00f9a \u0111\u00f4ng, h\u00e0ng r\u00e0o g\u1ed1m hai ng\u0103n n\u00e0y khi\u1ebfn nhi\u1ec7t kh\u00f3 truy\u1ec1n t\u1eeb bong b\u00f3ng kh\u00ed n\u00e0y sang bong b\u00f3ng kh\u00ed kh\u00e1c. \u201cR\u1ea5t kh\u00f3 \u0111\u1ec3 nhi\u1ec7t \u0111\u1ed9 truy\u1ec1n qua v\u1eadt li\u1ec7u b\u1eb1ng c\u00e1ch lan d\u1ecdc theo c\u00e1c l\u1edbp nguy\u00ean t\u1eed Bo, do l\u1ed9 tr\u00ecnh d\u00e0i v\u00e0 quanh co\u201d, theo Xiangfeng Duan, nh\u00e0 h\u00f3a h\u1ecdc v\u00e0 nh\u00e0 khoa h\u1ecdc v\u1eadt li\u1ec7u t\u1ea1i \u0110\u1ea1i h\u1ecdc California, Los Angeles.<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

<\/a>Th\u00ed nghi\u1ec7m cho th\u1ea5y t\u00ednh c\u00e1ch nhi\u1ec7t r\u1ea5t cao c\u1ee7a v\u1eadt li\u1ec7u m\u1edbi. \u1ea2nh: X. Xu Et Al\/Science 2019.<\/p>\n\n\n\n

C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u1ec3 m\u1ed9t b\u00f4ng hoa t\u01b0\u01a1i l\u00ean m\u1ed9t mi\u1ebfng v\u1eadt li\u1ec7u m\u1edbi d\u00e0y 2 cm v\u00e0 \u0111\u1eb7t d\u01b0\u1edbi m\u1ed9t ng\u1ecdn l\u1eeda (\u1ea3nh b\u00ean ph\u1ea3i l\u00e0 b\u1ea3n \u0111\u1ed3 nhi\u1ec7t). Sau 15 ph\u00fat, b\u1ec1 m\u1eb7t tr\u00ean c\u00f9ng \u0111o \u0111\u01b0\u1ee3c 45 \u0111\u1ed9 C v\u00e0 b\u00f4ng hoa ch\u1ec9 h\u01a1i h\u00e9o \u0111i.<\/p>\n\n\n\n

Trong khi c\u00e1c lo\u1ea1i g\u1ed1m aerogel kh\u00e1c c\u00f3 th\u1ec3 v\u1ee1 d\u01b0\u1edbi s\u1ef1 bi\u1ebfn thi\u00ean nhi\u1ec7t nhanh hay d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng nhi\u1ec7t trong th\u1eddi gian d\u00e0i, v\u1eadt li\u1ec7u aerogel m\u1edbi ch\u1ecbu \u0111\u01b0\u1ee3c \u0111\u1ebfn 500 chu k\u1ef3 gia nhi\u1ec7t v\u00e0 l\u00e0m l\u1ea1nh nhanh t\u1eeb 198 \u0111\u1ed9 \u0111\u1ebfn 900 \u0111\u1ed9 C (t\u0103ng ho\u1eb7c gi\u1ea3m 275 \u0111\u1ed9 m\u1ed7i gi\u00e2y), c\u0169ng nh\u01b0 b\u1ec1n v\u1eefng (gi\u1eef \u0111\u01b0\u1ee3c 95% t\u00ednh d\u1ebbo) \u1edf nhi\u1ec7t \u0111\u1ed9 1400 \u0111\u1ed9 C su\u1ed1t m\u1ed9t tu\u1ea7n.

Theo Julia Greer, nh\u00e0 khoa h\u1ecdc v\u1eadt li\u1ec7u t\u1ea1iVi\u1ec7n C\u00f4ng ngh\u1ec7 California, v\u1eadt li\u1ec7u m\u1edbi c\u00f2n m\u1ec1m v\u00e0 d\u1ec5 u\u1ed1n, n\u00ean \u0111\u1ec3 \u1ee9ng d\u1ee5ng trong th\u1ef1c t\u1ebf c\u00f3 l\u1ebd c\u1ea7n \u0111\u01b0\u1ee3c b\u1ecdc trong m\u1ed9t v\u1eadt li\u1ec7u kh\u00e1c b\u1ec1n ch\u1eafc h\u01a1n.<\/p>\n\n\n\n

Theo T\u00f9ng Anh<\/p>\n\n\n\n

dantri.com.vn<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ch\u1ebf t\u1ea1o th\u00e0nh c\u00f4ng m\u1ed9t lo\u1ea1i ch\u1ea5t c\u00e1ch nhi\u1ec7t m\u1edbi, g\u1ea7n nh\u01b0 kh\u00f4ng tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 c\u00f3 \u0111\u1ed9 b\u1ec1n nhi\u1ec7t cao h\u01a1n h\u1ea7u h\u1ebft v\u1eadt li\u1ec7u kh\u00e1c.\u00a0 Th\u00ed nghi\u1ec7m cho th\u1ea5y t\u00ednh c\u00e1ch nhi\u1ec7t r\u1ea5t cao c\u1ee7a v\u1eadt li\u1ec7u m\u1edbi. \u1ea2nh: X. Xu Et Al\/Science 2019.V\u1eadt li\u1ec7u m\u1edbi c\u00f3 c\u1ea5u […]<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-28623","post","type-post","status-publish","format-standard","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/28623","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=28623"}],"version-history":[{"count":1,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/28623\/revisions"}],"predecessor-version":[{"id":28624,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/28623\/revisions\/28624"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=28623"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=28623"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=28623"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}