{"id":8489,"date":"2018-07-13T00:10:58","date_gmt":"2018-07-12T23:10:58","guid":{"rendered":"https:\/\/engineernewsnetwork.com\/blog\/?p=8489"},"modified":"2018-07-12T14:47:41","modified_gmt":"2018-07-12T13:47:41","slug":"graphene-water-evaporation","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/graphene-water-evaporation\/","title":{"rendered":"Graphene: the key to controlling water evaporation?"},"content":{"rendered":"<p>Graphene coatings may offer the ability to control the water evaporation process from various surfaces, according to new research.<\/p>\n<p>The study, carried out by a team from the Chinese Academy of Sciences and the Collaborative Innovation Center of Quantum Matter (Beijing), looked at the interactions of water molecules with various graphene-covered surfaces.<\/p>\n<p>It is published in the journal <em>2D Materials<\/em>.<br \/>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block; text-align: center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-7565662001938327\" data-ad-slot=\"7585079586\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><br \/>\nLead author Dr Yongfeng Huang, from the Chinese Academy of Sciences, said: \u201cWater droplet evaporation is a ubiquitous and complicated phenomenon, and plays a pivotal role in nature and industry.<\/p>\n<p>\u201cUnderstanding its mechanism at the atomic scale, and controlling evaporation rate rationally is important for applications including heat transfer and body-temperature control.<\/p>\n<p>\u201cHowever, it remains a significant challenge.\u201d<\/p>\n<p>The team\u2019s experiments showed that a graphene coating controls water evaporation by suppressing the evaporation rate on hydrophilic surfaces, and accelerating evaporation on hydrophobic ones.<\/p>\n<p>Dr Huang said: \u201cMore importantly, we found graphene is \u2018transparent\u2019 for evaporation.<\/p>\n<p>\u201cWhen a hydrophilic surface is coated with graphene, the contact line of the water droplet is dramatically shortened or elongated, because of adjustment in wetting angles. This leads to changes in the evaporation rate.\u201d<\/p>\n<p>The researchers wanted to understand the \u2018transparency\u2019 in graphene-mediated evaporation, and uncover its underlying structure on the atomic scale.<\/p>\n<p>To do this, they conducted molecular dynamics simulations on water droplet evaporation, on surfaces with and without a graphene coating.<\/p>\n<p>For the first time, they identified the atomic-scale mechanism for substrate-induced evaporation events. They found that water molecule forms a precursor state at the contact line before it evaporates.<\/p>\n<p>Dr. Huang explained: \u201cFurther analysis showed water density in evaporation transition states is largest at the contact line, then decreases exponentially as it goes away from the substrate. Single water desorption at the contact line dominates the droplet evaporation process.<\/p>\n<p>\u201cSince the graphene does not alter the binding energy of a single water molecule, it has negligible effects on evaporation of per contact line.<\/p>\n<p>\u201cOur results are an important discovery on graphene-mediated evaporation, and also point to new ways to rationally control evaporation process, for realistic applications in heat transfer, printing and related areas.\u201d<\/p>\n<p>Professor James Sprittles from the University of Warwick, UK assessed the work.<\/p>\n<p>He said: \u201cUsing experiments supplemented with molecular dynamics simulations, Dr. Huang and co-workers have provided fascinating insights into the molecular mechanisms governing the evaporation of water droplets on technologically-relevant graphene coated substrates.<\/p>\n<p>\u201cTheir research shows that wettability is solely responsible for evaporation rate changes, and simultaneously opens up several interesting topics for future research, such as how molecular effects (eg, precursor nanofilms and thermal fluctuations) can be incorporated into macroscopic modelling.\u201d<\/p>\n<p>The published version of <em>Transparency in Graphene Mediated Evaporation<\/em> (Huang et al 2018 2D Mater. 5 041001) can be found <span class=\"highlight highlight-blue\"><a href=\"http:\/\/email.precise.uk\/c\/eJwNzUFuwyAQheHTmF0R4wF7WLBw20Tqtj0BhSFGSSHCRJFy-iK9xbd6f3SsA4ckspsVkFoBANEoK0Fu1nzQCc5EJ6RNfU5a3RuHfLB8XMXufiNbi5phJVpSCuiTme2yrBE9-8WKd9_D_pNf7DRqcXN77_djwm2az2OxZlnbZQiUBEU0NCuDb2AIh70PNiXRXC6pjjaXSy7MrfDzKNyftV1lqH-iu2--sT_4K45vPWuz_gMgFD6g\" target=\"_blank\" rel=\"noopener\">HERE<\/a><\/span>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Graphene coatings may offer the ability to control the water evaporation process from various surfaces, according to new research. The study, carried out by a team from the Chinese Academy of Sciences and the Collaborative Innovation Center of Quantum Matter (Beijing), looked at the interactions of water molecules with various graphene-covered surfaces. It is published &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[199],"tags":[4761,4759,4760,375,3417,4758],"class_list":["post-8489","post","type-post","status-publish","format-standard","","category-news-views-and-opinion","tag-2d-materials","tag-chinese-academy-of-sciences","tag-collaborative-innovation-center-of-quantum-matter-beijing","tag-graphene","tag-institute-of-physics","tag-water-evaporation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Graphene: the key to controlling water evaporation? - Engineer News Network<\/title>\n<meta name=\"description\" content=\"Graphene coatings may offer the ability to control the water evaporation process from various surfaces, according to new research\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/graphene-water-evaporation\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Graphene: the key to controlling water evaporation? 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