{"id":1236490,"date":"2025-03-03T11:41:42","date_gmt":"2025-03-03T16:41:42","guid":{"rendered":"https:\/\/www.prime-wow.com\/?p=1236490"},"modified":"2025-03-03T11:41:42","modified_gmt":"2025-03-03T16:41:42","slug":"these-hot-oil-droplets-can-bounce-off-any-surface","status":"publish","type":"post","link":"https:\/\/www.prime-wow.com\/?p=1236490","title":{"rendered":"These hot oil droplets can bounce off any surface"},"content":{"rendered":"<div>\n<figure class=\"video ars-wp-video\">\n<div class=\"wrapper ars-wp-video-wrapper relative\" style=\"aspect-ratio: 1.7818181818182;\">\n    <video class=\"wp-video-shortcode absolute w-full h-full object-cover left-0 top-0\" id=\"video-2078136-1\" width=\"980\" height=\"550\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/www.prime-wow.com\/wp-content\/uploads\/2025\/03\/burning-droplets-bouncing-Zhu-et-al.-Newton.mp4\">Burning droplets bounce back. Credit: Zulu et al., 2025<\/video>\n  <\/div><figcaption>\n    <span class=\"icon caption-arrow icon-drop-indicator\"><\/span><\/p>\n<div class=\"caption font-impact dusk:text-gray-300 mb-4 mt-2 inline-flex flex-row items-stretch gap-1 text-base leading-tight text-gray-400 dark:text-gray-300\">\n<div class=\"caption-icon bg-[left_top_5px] w-[10px] shrink-0\"><\/div>\n<div class=\"caption-content\">\n      Burning droplets bounce back. Credit: Zulu et al., 2025<\/p><\/div>\n<\/p><\/div>\n<\/figcaption><\/figure>\n<p>Droplets bouncing off surfaces are an everyday phenomenon, like raindrops bouncing off lotus leaves or water drops sizzling in a hot pan, levitating and sliding around\u2014aka the Leidenfrost effect. There is also an inverse Leidenfrost effect, first described in 1969, that involves a hot object such as a droplet levitating above a cold surface. Understanding the mechanisms behind these phenomena is crucial to a broad range of practical applications, such as self-cleaning, anti-icing, anti-fogging, surface charge printing, or droplet-based logic systems.<\/p>\n<p>Droplets usually only bounce if the surface is superheated or engineered in some way to reduce stickiness. Physicists from the City University of Hong Kong have figured out how to achieve this bouncing behavior of hot oil droplets off almost any surface, according to a <a href=\"https:\/\/www.cell.com\/newton\/fulltext\/S2950-6360(25)00006-4\">new paper<\/a> published in the journal Newton.<\/p>\n<p>As we&#8217;ve <a href=\"https:\/\/arstechnica.com\/science\/2019\/05\/study-finds-ultimate-fate-of-leidenfrost-droplets-depends-on-their-size\/\">reported previously<\/a>, in 1756, a German scientist named <a href=\"https:\/\/en.wikipedia.org\/wiki\/Johann_Gottlob_Leidenfrost\">Johann Gottlob Leidenfrost<\/a> reported <a href=\"https:\/\/www.researchgate.net\/publication\/276354792_A_Tract_About_Some_Qualities_of_Common_Water_English_translation_of_Johann_Gottlob_Leidenfrost_De_Aquae_Communis_Nonnullis_Qualitatibus_Tractatus_Duisburg_on_Rhine_1756_Carolyn_S_E_Wares_translator\">his observation<\/a> of the unusual phenomenon. Normally, he noted, water splashed onto a very hot pan sizzles and evaporates very quickly. But if the pan&#8217;s temperature is well above water&#8217;s boiling point, &#8220;gleaming drops resembling quicksilver&#8221; will form and skitter across the surface. It&#8217;s called the &#8220;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Leidenfrost_effect\">Leidenfrost effect&#8221;<\/a>\u00a0in his honor.<\/p>\n<p><a href=\"https:\/\/arstechnica.com\/science\/2025\/03\/these-hot-oil-droplets-can-bounce-off-any-surface\/\">Read full article<\/a><\/p>\n<p><a href=\"https:\/\/arstechnica.com\/science\/2025\/03\/these-hot-oil-droplets-can-bounce-off-any-surface\/#comments\">Comments<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Burning droplets bounce back. Credit: Zulu et al., 2025 Burning droplets bounce back. Credit: Zulu et al., 2025 Droplets bouncing off surfaces are an everyday phenomenon, like raindrops bouncing off lotus leaves or water drops sizzling in a hot pan, &hellip; <a href=\"https:\/\/www.prime-wow.com\/?p=1236490\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[27,44,110],"tags":[],"class_list":["post-1236490","post","type-post","status-publish","format-standard","hentry","category-ars-technica","category-technology","category-unfiltered-rss"],"_links":{"self":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/posts\/1236490","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1236490"}],"version-history":[{"count":0,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/posts\/1236490\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1236490"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1236490"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1236490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}