{"id":1379,"date":"2019-08-02T02:07:34","date_gmt":"2019-08-02T02:07:34","guid":{"rendered":"http:\/\/chemweb.unl.edu\/cheung\/?p=1379"},"modified":"2019-08-15T16:46:37","modified_gmt":"2019-08-15T16:46:37","slug":"growth-of-carbon-dioxide-whiskers","status":"publish","type":"post","link":"http:\/\/chemweb.unl.edu\/cheung\/growth-of-carbon-dioxide-whiskers\/","title":{"rendered":"Growth of molecular solids"},"content":{"rendered":"<p>We study new forms of molecular solids through kinetically-controlled phase transformation. For example, we recently discovered the growth of carbon dioxide (CO<sub>2<\/sub>) whiskers at low temperatures (-70 degree C to -65 degree C) and moderate pressure (4.4 bar to 1.0 bar). Their axial growth was assessed by optical video analysis. The identities of these whiskers were confirmed as CO<sub>2<\/sub> solids by Raman spectroscopy. A vapor\u2013 solid growth mechanism was proposed based on the influence of the relative humidity on the growth.<\/p>\n<p>Below is a video showing the growth of CO<sub>2<\/sub> whiskers:<\/p>\n<div style=\"width: 640px;\" class=\"wp-video\"><!--[if lt IE 9]><script>document.createElement('video');<\/script><![endif]-->\n<video class=\"wp-video-shortcode\" id=\"video-1379-1\" width=\"640\" height=\"427\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"http:\/\/chemweb.unl.edu\/cheung\/wp-content\/uploads\/2019\/08\/CO2_whisker_growth.mp4?_=1\" \/><a href=\"http:\/\/chemweb.unl.edu\/cheung\/wp-content\/uploads\/2019\/08\/CO2_whisker_growth.mp4\">http:\/\/chemweb.unl.edu\/cheung\/wp-content\/uploads\/2019\/08\/CO2_whisker_growth.mp4<\/a><\/video><\/div>\n<p>&nbsp;<\/p>\n<p>Funding support: National Science Foundation (Grant #: CHE 1665324).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We study new forms of molecular solids through kinetically-controlled phase transformation. For example, we recently discovered the growth of carbon dioxide (CO2) whiskers at low temperatures (-70 degree C to -65 degree C) and moderate pressure (4.4 bar to 1.0 bar). Their axial growth was assessed by optical video analysis. The identities of these whiskers&#8230;<\/p>\n","protected":false},"author":4,"featured_media":1390,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"_links":{"self":[{"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/posts\/1379"}],"collection":[{"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/comments?post=1379"}],"version-history":[{"count":12,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/posts\/1379\/revisions"}],"predecessor-version":[{"id":1416,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/posts\/1379\/revisions\/1416"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/media\/1390"}],"wp:attachment":[{"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/media?parent=1379"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/categories?post=1379"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/chemweb.unl.edu\/cheung\/wp-json\/wp\/v2\/tags?post=1379"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}