{"id":432102,"date":"2022-04-15T13:59:12","date_gmt":"2022-04-15T10:59:12","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/electrostatics-influence-the-movement-of-drops-on-surfaces\/"},"modified":"2022-04-15T13:59:12","modified_gmt":"2022-04-15T10:59:12","slug":"electrostatics-influence-the-movement-of-drops-on-surfaces","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/electrostatics-influence-the-movement-of-drops-on-surfaces\/","title":{"rendered":"#Electrostatics influence the movement of drops on surfaces"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a3e55f0a8461\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #dd3333;color:#dd3333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #dd3333;color:#dd3333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a3e55f0a8461\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/buradabiliyorum.com\/en\/electrostatics-influence-the-movement-of-drops-on-surfaces\/#%E2%80%9CElectrostatics_influence_the_movement_of_drops_on_surfaces%E2%80%9D\" >&#8220;Electrostatics influence the movement of drops on surfaces&#8221;<\/a><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"%E2%80%9CElectrostatics_influence_the_movement_of_drops_on_surfaces%E2%80%9D\"><\/span>&#8220;Electrostatics influence the movement of drops on surfaces&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2022\/electrostatics-influen.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2022\/electrostatics-influen.jpg\" data-sub-html=\"The movement of droplets on surfaces is also influenced by electrostatic forces, as researchers have now discovered. Credit: R\u00fcdiger Berger \/ MPI-P\">\n<figure class=\"article-img\">\n            <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/scx1.b-cdn.net\/csz\/news\/800a\/2022\/electrostatics-influen.jpg\" alt=\"Electrostatics influence the movement of drops on surfaces\" title=\"The movement of droplets on surfaces is also influenced by electrostatic forces, as researchers have now discovered. Credit: R\u00fcdiger Berger \/ MPI-P\" width=\"800\" height=\"530\"\/><figcaption class=\"text-darken text-low-up text-truncate-js text-truncate mt-3\">\n                The movement of droplets on surfaces is also influenced by electrostatic forces, as researchers have now discovered. Credit: R\u00fcdiger Berger \/ MPI-P<br \/>\n            <\/figcaption><\/figure>\n<\/p><\/div>\n<\/div>\n<p>Something as simple as the motion of water drops on surfaces should actually be understood\u2014one would think. In fact there are still numerous unanswered questions about the forces acting on a sliding droplet. A team of researchers from the Max Planck Institute for Polymer Research in collaboration with colleagues from TU Darmstadt has now discovered: In addition to surface energy and viscous friction within the droplet, electrostatics also play a significant role. The results were recently published in the journal <i>Nature Physics<\/i>.<\/p>\n<section class=\"article-banner first-banner ads-336x280\">\n         <!-- \/4988204\/Phys_Story_InText_Box --><\/p>\n<\/section>\n<p>Raindrops hit the car window and the wind pushes the drops to the side. Even today, no one has been able to precisely predict how the drops move on the windshield. Yet such an understanding is important in numerous areas, such as autonomous driving: For example, cameras installed in the windshield are supposed to keep an eye on the road and the traffic situation\u2014for this, the surface of the windshield must be designed in such a way that the drops are completely blown down by the airstream and the view remains clear even in the rain. Other examples with the opposite sign are <a href=\"https:\/\/buradabiliyorum.com\/en\/category\/download-scripts-themes-apps\/\" data-internallinksmanager029f6b8e52c=\"9\" title=\"Download Scripts &amp; Themes &amp; Apps\" target=\"_blank\" rel=\"noopener\">app<\/a>lications where drops need to stick to surfaces, such as spray paint or pesticides.<\/p>\n<p>&#8220;Until now, it was assumed that the surface coating was responsible for how the droplet moves on a surface\u2014that is, the first few molecular layers,&#8221; says Prof. Hans-J\u00fcrgen Butt, who is director of the &#8220;Physics of Interfaces&#8221; department at the Max Planck Institute for Polymer Research. For example, it depends on the surface whether a spherical or a flat droplet shape is formed. If the drop likes the surface, it presses itself flat onto it to make as much contact as possible. If it does not like the surface, as in the case of the well-known lotus effect, it curls up. It was also clear that when a droplet moves, viscous friction\u2014i.e. friction between the individual water molecules\u2014occurs within the droplet, which also influences its movement.<\/p>\n<p><b>Electrostatics cause differences in velocity<\/b><\/p>\n<p>The team of researchers at the MPI for Polymer Research found that neither capillary nor viscoelastic forces can explain the differences in the speed at which droplets move across different surfaces. Questions were raised in particular by the fact that the droplets run at different speeds on different substrates\u2014even if these substrates have an identical surface coating, where no differences would be expected. The researchers therefore first introduced a mysterious &#8220;extra force.&#8221; To track it down, Xiaomei Li, a Ph.D. student in Hans-J\u00fcrgen Butt&#8217;s department, organized a drop race. &#8220;I filmed the drops on different substrates, extracted velocity and acceleration profiles from their motion, calculated out the forces that were already known to calculate the force that we had not yet had a look at,&#8221; she explains.<\/p>\n<p>The astonishing result: the calculated force agrees with an electrostatic force that the researchers first described in a model a few years ago. &#8220;By comparing the experimental results with this numerical model, we can explain previously confusing droplet trajectories,&#8221; says Jun.-Prof. Stefan Weber, a group leader in Butt&#8217;s department.<\/p>\n<p>If previously neutral droplets slide over an insulator, they can become electrically charged: So electrostatics plays a significant role there. On an electrically conductive substrate, on the other hand, the droplet im<a href=\"https:\/\/buradabiliyorum.com\/en\/category\/social-mediaa\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Social Media\" target=\"_blank\" rel=\"noopener\">media<\/a>tely releases its charge back to the substrate. &#8220;The electrostatic force, which no one had previously considered, therefore has a major influence: it must be taken into account for water, aqueous electrolytes and ethylene glycol on all hydrophobic surfaces tested,&#8221; Weber summarizes. The research team has now published the results in the journal <i>Nature Physics<\/i>. These results will improve the control of droplet motion in many applications ranging from printing to microfluidics or water management to power generation via droplet-based mini-generators.<\/p>\n<hr\/>\n<div class=\"article-main__explore my-4 d-print-none\">\n<p>                                            Multi-functional electrostatic droplet tweezer remotely guides droplet motion\n                                        <\/p><\/div>\n<hr class=\"mb-4\"\/>\n<div class=\"article-main__more p-4\">\n                                                                                                <strong>More information:<\/strong><br \/>\n                                                Xiaomei Li et al, Spontaneous charging affects the motion of sliding drops, <i>Nature Physics<\/i> (2022).  <a rel=\"nofollow noopener\" target=\"_blank\" data-doi=\"1\" href=\"https:\/\/dx.doi.org\/10.1038\/s41567-022-01563-6\">DOI: 10.1038\/s41567-022-01563-6<\/a><\/p><\/div>\n<div class=\"d-inline-block text-medium my-4\">\n                                                Provided by<br \/>\n                                                                                                    Max Planck Society<br \/>\n                                                                                                        <a rel=\"nofollow noopener\" target=\"_blank\" class=\"icon_open\" href=\"http:\/\/www.mpg.de\/english\/portal\/index.html\"><br \/>\n                                                        <svg>\n                                                            <use href=\"https:\/\/phys.b-cdn.net\/tmpl\/v6\/img\/svg\/sprite.svg#icon_open\" x=\"0\" y=\"0\"\/>\n                                                        <\/svg><br \/>\n                                                    <\/a><\/p><\/div>\n<p>                                        <!-- print only --><\/p>\n<div class=\"d-none d-print-block\">\n<p>                                                 <strong>Citation<\/strong>:<br \/>\n                                                 Electrostatics influence the movement of drops on surfaces (2022, April 15)<br \/>\n                                                 retrieved 15 April 2022<br \/>\n                                                 from https:\/\/phys.org\/<a href=\"https:\/\/buradabiliyorum.com\/en\/category\/news\/\" data-internallinksmanager029f6b8e52c=\"2\" title=\"News\" target=\"_blank\" rel=\"noopener\">news<\/a>\/2022-04-electrostatics-movement-surfaces.html<\/p>\n<p>                                            This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no<br \/>\n                                            part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n<p><script id=\"facebook-jssdk\" async=\"\" src=\"https:\/\/connect.facebook.net\/en_US\/sdk.js\"><\/script><\/p>\n<blockquote><p><strong><span style=\"color: #ff6600;\">If you liked the article, do not forget to share it with your friends. 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Credit: R\u00fcdiger Berger \/ MPI-P Something as simple as the motion of water drops on surfaces should actually be understood\u2014one would think. In fact there are still numerous unanswered questions&#8230;<\/p>\n","protected":false},"author":1,"featured_media":432103,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/scx2.b-cdn.net\/gfx\/news\/2022\/electrostatics-influen.jpg","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[],"class_list":["post-432102","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sciencee"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/432102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=432102"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/432102\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media\/432103"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=432102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=432102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=432102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}