{"id":27597,"date":"2020-04-20T16:38:00","date_gmt":"2020-04-20T09:38:00","guid":{"rendered":"https:\/\/ttud.com.vn\/?p=27597"},"modified":"2021-11-09T09:46:07","modified_gmt":"2021-11-09T02:46:07","slug":"phuong-phap-tinh-chinh-cac-vat-lieu-oxit-phuc-hop-moi","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/phuong-phap-tinh-chinh-cac-vat-lieu-oxit-phuc-hop-moi\/","title":{"rendered":"Ph\u01b0\u01a1ng ph\u00e1p tinh ch\u1ec9nh c\u00e1c v\u1eadt li\u1ec7u oxit ph\u1ee9c h\u1ee3p m\u1edbi"},"content":{"rendered":"\n

M\u1ed9t c\u00e1ch \u0111\u1ec3 thay \u0111\u1ed5i t\u00ednh ch\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u l\u00e0 k\u00e9o d\u00e0i n\u00f3 ch\u1ec9 m\u1ed9t ch\u00fat \u00edt, khi \u0111\u00f3 c\u00e1c nguy\u00ean t\u1eed c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch xa nhau h\u01a1n nh\u01b0ng li\u00ean k\u1ebft gi\u1eefa ch\u00fang kh\u00f4ng b\u1ecb ph\u00e1 v\u1ee1. Kho\u1ea3ng c\u00e1ch th\u00eam n\u00e0y c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u00e0nh vi c\u1ee7a c\u00e1c \u0111i\u1ec7n t\u1eed, \u0111i\u1ec1u n\u00e0y s\u1ebd gi\u00fap ch\u00fang ta x\u00e1c \u0111\u1ecbnh xem v\u1eadt li\u1ec7u l\u00e0 ch\u1ea5t c\u00e1ch \u0111i\u1ec7n hay ch\u1ea5t d\u1eabn \u0111i\u1ec7n ch\u1eb3ng h\u1ea1n. Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi c\u1ea5p v\u1eadt li\u1ec7u oxit ph\u1ee9c h\u1ee3p quan tr\u1ecdng, vi\u1ec7c k\u00e9o d\u00e0i v\u1eadt li\u1ec7u s\u1ebd kh\u00f4ng th\u1ef1c hi\u1ec7n d\u1ec5 nh\u01b0 v\u1eady. Ch\u00fang gi\u00f2n nh\u01b0 c\u00e1c lo\u1ea1i ly c\u00e0 ph\u00ea g\u1ed1m v\u00e0 d\u1ec5 v\u1ee1 v\u1ee5n.<\/p>\n\n\n\n

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

Gi\u1edd \u0111\u00e2y, c\u00e1c nh\u00e0 khoa h\u1ecdc t\u1ea1i Ph\u00f2ng th\u00ed nghi\u1ec7m M\u00e1y gia t\u1ed1c Qu\u1ed1c gia SLAC c\u1ee7a B\u1ed9 N\u0103ng l\u01b0\u1ee3ng v\u00e0 Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc Stanford \u0111\u00e3 t\u00ecm ra c\u00e1ch c\u00f3 th\u1ec3 kh\u1eafc ph\u1ee5c v\u1ea5n \u0111\u1ec1 n\u00e0y \u0111\u1ed1i v\u1edbi m\u1ed9t lo\u1ea1i v\u1eadt li\u1ec7u oxit ph\u1ee9c h\u1ee3p \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 LCMO (lanthanum canxi mangan oxit). H\u1ecd \u0111\u00e3 t\u1ea1o ra \u0111\u01b0\u1ee3c m\u1ed9t m\u00e0ng si\u00eau m\u1ecfng, linh ho\u1ea1t t\u1eeb v\u1eadt li\u1ec7u th\u00f4ng th\u01b0\u1eddng r\u1ea5t d\u1ec5 g\u00e3y v\u00e0 gi\u00f2n n\u00e0y b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c b\u1ed9 vi thao t\u00e1c (micromanipulators) \u0111\u1ec3 k\u00e9o c\u0103ng n\u00f3 tr\u00ean m\u1ed9t thi\u1ebft b\u1ecb nh\u1ecf v\u00e0 d\u00e1n n\u00f3 ngay t\u1ea1i ch\u1ed7 \u0111\u1ec3 duy tr\u00ec \u0111\u1ed9 gi\u00e3n c\u1ee7a v\u1eadt li\u1ec7u.<\/p>\n\n\n\n

B\u1eb1ng c\u00e1ch gia nhi\u1ec7t t\u1eeb t\u1eeb \u0111\u1ec3 l\u00e0m tan ch\u1ea3y ch\u1ea5t keo d\u00ednh, h\u1ecd \u0111\u00e3 gi\u1ea3i ph\u00f3ng v\u00e0 k\u00e9o c\u0103ng \u0111\u01b0\u1ee3c m\u1ed9t l\u1edbp m\u00e0ng trong su\u1ed1t gi\u1ed1ng nhau nhi\u1ec1u l\u1ea7n v\u00e0 quan s\u00e1t n\u00f3 chuy\u1ec3n t\u1eeb ch\u1ea5t c\u00e1ch \u0111i\u1ec7n sang ch\u1ea5t d\u1eabn \u0111i\u1ec7n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. Vi\u1ec7c k\u00e9o d\u00e0i v\u1eadt li\u1ec7u c\u0169ng \u0111\u00e3 l\u00e0m thay \u0111\u1ed5i c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb t\u00ednh c\u1ee7a n\u00f3.<\/p>\n\n\n\n

Harold Hwang, gi\u00e1o s\u01b0 t\u1ea1i SLAC v\u00e0 Stanford v\u00e0 l\u00e0 nh\u00e0 nghi\u00ean c\u1ee9u c\u1ee7a Vi\u1ec7n Nghi\u00ean c\u1ee9u v\u1eadt Li\u1ec7u v\u00e0 khoa h\u1ecdc n\u0103ng l\u01b0\u1ee3ng Stanford (SIMES) cho bi\u1ebft: \u201cCh\u00fang t\u00f4i c\u00f3 th\u1ec3 k\u00e9o d\u00e0i v\u00e0 l\u00e0m c\u0103ng nh\u1eefng v\u1eadt li\u1ec7u n\u00e0y m\u1ed9t c\u00e1ch \u0111\u00e1ng k\u1ec3. \u0110i\u1ec1u n\u00e0y m\u1edf ra m\u1ed9t th\u1ebf gi\u1edbi ho\u00e0n to\u00e0n m\u1edbi c\u00f3 kh\u1ea3 n\u0103ng t\u00e1c \u0111\u1ed9ng v\u01b0\u1ee3t ra ngo\u00e0i nghi\u00ean c\u1ee9u c\u1ee5 th\u1ec3 n\u00e0y<\/em>\u201d.<\/p>\n\n\n\n

Nh\u1eefng ph\u00e1t hi\u1ec7n n\u00e0y c\u1ee7a h\u1ecd nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 tr\u00ean t\u1ea1p ch\u00ed Science today<\/em>.<\/p>\n\n\n\n

LCMO c\u00f2n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 v\u1eadt li\u1ec7u l\u01b0\u1ee3ng t\u1eed v\u00ec c\u00e1c electron c\u1ee7a n\u00f3 ho\u1ea1t \u0111\u1ed9ng theo nh\u1eefng c\u00e1ch kh\u00e1c th\u01b0\u1eddng v\u00e0 th\u01b0\u1eddng g\u00e2y nhi\u1ec1u ng\u1ea1c nhi\u00ean cho c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u.<\/p>\n\n\n\n

C\u00e1c nh\u00e0 khoa h\u1ecdc r\u1ea5t mong mu\u1ed1n c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t v\u00e0 tinh ch\u1ec9nh h\u00e0nh vi  c\u1ee7a v\u1eadt li\u1ec7u n\u00e0y \u0111\u1ec3 t\u1ea1o ra m\u1ed9t th\u1ebf h\u1ec7 \u0111i\u1ec7n t\u1eed m\u1edbi v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng trong truy\u1ec1n t\u1ea3i \u0111i\u1ec7n, v\u1eadn chuy\u1ec3n, \u0111i\u1ec7n to\u00e1n, c\u1ea3m bi\u1ebfn v\u00e0 m\u00e1y d\u00f2 v\u1eadt li\u1ec7u.<\/p>\n\n\n\n

C\u00e1c m\u00e0ng m\u1ecfng c\u1ee7a v\u1eadt li\u1ec7u l\u01b0\u1ee3ng t\u1eed th\u01b0\u1eddng \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a v\u1eadt li\u1ec7u kh\u00e1c. B\u1ed1n n\u0103m tr\u01b0\u1edbc, nh\u00f3m c\u1ee7a Hwang \u0111\u00e3 b\u00e1o c\u00e1o m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p gi\u00fap h\u1ecd t\u00e1ch d\u1ec5 d\u00e0ng nh\u1eefng l\u1edbp m\u00e0ng m\u1ecfng n\u00e0y do \u0111\u00f3 h\u1ecd c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n nghi\u00ean c\u1ee9u theo nh\u1eefng c\u00e1ch m\u1edbi.<\/p>\n\n\n\n

Seung Sae Hong, m\u1ed9t trong s\u1ed1 nh\u00e0 nghi\u00ean c\u1ee9u th\u1ef1c hi\u1ec7n nghi\u00ean c\u1ee9u tr\u01b0\u1edbc \u0111\u00f3 v\u00e0 c\u0169ng l\u00e0 tr\u01b0\u1edfng nh\u00f3m nghi\u00ean c\u1ee9u n\u00e0y, \u0111\u00e3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p m\u1edbi \u0111\u1ec3 t\u1ea1o ra v\u00e0 gi\u1ea3i ph\u00f3ng nh\u1eefng m\u1ea3nh LCMO nh\u1ecf, c\u00f3 \u0111\u1ed9 m\u1ecfng h\u01a1n h\u1eb3n so v\u1edbi nh\u1eefng m\u00e0ng tr\u01b0\u1edbc \u0111\u00e2y, v\u1edbi \u0111\u1ed9 d\u00e0y nh\u1ecf h\u01a1n 20 nano m\u00e9t. Nh\u1eefng m\u00e0ng n\u00e0y g\u1ea7n nh\u01b0 trong su\u1ed1t v\u00e0 linh ho\u1ea1t m\u1ed9t c\u00e1ch \u0111\u00e1ng ng\u1ea1c nhi\u00ean.<\/p>\n\n\n\n

Vi\u1ec7c k\u00e9o th\u1eb3ng m\u1ed9t m\u1ea3nh v\u1ee5n c\u1ee1 nh\u1ecf, d\u1ec5 v\u1ee1 nh\u01b0 v\u1eady s\u1ebd r\u1ea5t kh\u00f3 kh\u0103n, nh\u01b0ng Seung Sae Hong \u0111\u00e3 kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c nh\u1eefng v\u1ea5n \u0111\u1ec1 \u0111\u00f3 b\u1eb1ng c\u00e1ch \u0111\u1eb7t n\u00f3 l\u00ean m\u1ed9t t\u1ea5m m\u00e0ng polymer m\u1ecfng. Sau \u0111\u00f3, Hong \u0111\u00e3 ghim m\u00e0ng polymer n\u00e0y theo b\u1ed1n ph\u00eda c\u1ee7a n\u00f3 v\u00e0 s\u1eed d\u1ee5ng m\u1ed9t b\u1ed9 vi thao t\u00e1c \u0111\u1ec3 gh\u00ecm v\u00e0 k\u00e9o c\u0103ng n\u00f3 – \u0111\u00f4i khi theo m\u1ed9t h\u01b0\u1edbng, \u0111\u00f4i khi theo c\u1ea3 hai h\u01b0\u1edbng c\u00f9ng m\u1ed9t l\u00fac. Khi k\u00e9o d\u00e0i \u0111\u01b0\u1ee3c LCMO, l\u1edbp n\u1ec1n polymer c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o m\u1ed9t b\u1ec1 m\u1eb7t kh\u00e1c v\u00e0 chuy\u1ec3n sang m\u1ed9t d\u1ee5ng c\u1ee5 kh\u00e1c \u0111\u1ec3 ki\u1ec3m tra b\u1eb1ng tia X.<\/p>\n\n\n\n

\u201cNghi\u00ean c\u1ee9u m\u1edf ra c\u01a1 h\u1ed9i cho vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n c\u01a1 h\u1ecdc c\u00e1c l\u1edbp v\u1eadt li\u1ec7u theo c\u00e1ch ch\u00fang ta kh\u00f4ng th\u1ec3 l\u00e0m tr\u01b0\u1edbc \u0111\u00e2y. V\u00e0 n\u00f3 cho ch\u00fang ta \u00fd t\u01b0\u1edfng v\u1ec1 c\u00e1ch ch\u00fang ta c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf v\u1eadt li\u1ec7u linh ho\u1ea1t cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed, bao g\u1ed3m c\u1ea3m bi\u1ebfn v\u00e0 m\u00e1y d\u00f2 \u0111o l\u01b0\u1eddng ch\u1ec9 v\u1edbi nh\u1eefng thay \u0111\u1ed5i r\u1ea5t nh\u1ecf<\/em>\u201d, Hong cho bi\u1ebft.<\/p>\n\n\n\n

P.T.T (NASATI)<\/em><\/p>\n\n\n\n

theo https:\/\/phys.org\/news\/2020-04-fine-tune-exotic-materials-thin-clamp.html, 2\/4\/2020<\/em><\/p>\n\n\n\n

https:\/\/www.vista.gov.vn\/news\/khoa-hoc-ky-thuat-va-cong-nghe\/phuong-phap-tinh-chinh-cac-vat-lieu-oxit-phuc-hop-moi-1817.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

M\u1ed9t c\u00e1ch \u0111\u1ec3 thay \u0111\u1ed5i t\u00ednh ch\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u l\u00e0 k\u00e9o d\u00e0i n\u00f3 ch\u1ec9 m\u1ed9t ch\u00fat \u00edt, khi \u0111\u00f3 c\u00e1c nguy\u00ean t\u1eed c\u1ee7a v\u1eadt li\u1ec7u c\u00e1ch xa nhau h\u01a1n nh\u01b0ng li\u00ean k\u1ebft gi\u1eefa ch\u00fang kh\u00f4ng b\u1ecb ph\u00e1 v\u1ee1. Kho\u1ea3ng c\u00e1ch th\u00eam n\u00e0y c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u00e0nh vi c\u1ee7a c\u00e1c \u0111i\u1ec7n t\u1eed, \u0111i\u1ec1u n\u00e0y […]<\/p>\n","protected":false},"author":25,"featured_media":29756,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-27597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/27597","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\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=27597"}],"version-history":[{"count":2,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/27597\/revisions"}],"predecessor-version":[{"id":29757,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/27597\/revisions\/29757"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/29756"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=27597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=27597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=27597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}