{"id":11246,"date":"2011-06-08T11:08:00","date_gmt":"2011-06-08T18:08:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/waters-surface-not-all-wet\/"},"modified":"2023-04-19T11:21:20","modified_gmt":"2023-04-19T18:21:20","slug":"waters-surface-not-all-wet","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/waters-surface-not-all-wet\/","title":{"rendered":"Water\u2019s Surface Not All Wet"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n  \n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=faculty\">Faculty<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Water\u2019s Surface Not All Wet<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  Some water molecules split the difference between gas and liquid, a study in <em>Nature<\/em> shows.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Carl Marziali<\/a><\/strong>\n    \n          <span class=\"post-date-field\">June 8, 2011<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span 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fill-rule=\"evenodd\" transform=\"translate(-6 -9)\"\/><\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n  \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>Air and water meet over most of the earth&rsquo;s surface, but exactly where one ends and the other begins turns out to be a surprisingly subtle question.<\/p>\n<p>A new study in <em>Nature<\/em> narrows the boundary to just one quarter of water molecules in the uppermost layer &mdash; those that happen to have one hydrogen atom in water and the other vibrating freely above.<\/p>\n<p>Such molecules straddle gas and liquid phases, according to senior author and USC Dornsife Associate Professor of Chemistry Alexander Benderskii, who said the free hydrogen behaves like an atom in gas phase, while its twin below acts much like the other atoms that make up &ldquo;bulk&rdquo; water.<\/p>\n<p>The finding matters for theoretical reasons and for practical studies of reactions at the water&rsquo;s surface, including the processes that maintain a vital supply of nitrogen, oxygen and carbon dioxide in the atmosphere.<\/p>\n<p>&ldquo;The air-water interface is about 70 percent of the earth&rsquo;s surface,&rdquo; Benderskii said. &ldquo;A lot of chemical reactions that are responsible for our atmospheric balance, as well as many processes important in environmental chemistry, happen at the air-water interface.&rdquo;<\/p>\n<p>He added that the study provided a new way for chemists and biologists to study other interfaces, such as the boundary between water and biomembranes that marks the edge of every living cell.<\/p>\n<p>&ldquo;Water interfaces in general are important,&rdquo; Benderskii said, calling the study &ldquo;an open door that now we can walk through and broaden the range of our investigations to other, perhaps more complex, acqueous interfaces.&rdquo;<\/p>\n<p>In their study, Benderskii and his colleagues used techniques they invented to test the strength of hydrogen bonds linking water molecules (from the hydrogen of one molecule to the oxygen of another). These are the bonds that keep water a liquid at room temperature.<\/p>\n<p>Specifically, the researchers inferred the bond strength by measuring the hydrogen-oxygen vibration frequency. The bond gets stronger as the frequency decreases, similar to the pull one feels when slowing down a child on a swing.<\/p>\n<p>The researchers focused on the straddling molecules with only one hydrogen atom in water.<\/p>\n<p>Compared to other bonds deeper in water, &ldquo;the hydrogen bond is surprisingly only slightly weaker,&rdquo; according to Benderskii.<\/p>\n<p>Likewise, the bond for the hydrogen atom sticking out of the water is similar in strength to bonds in the gas phase.<\/p>\n<p>The researchers concluded that the change between air and water happens in the space of a single water molecule.<\/p>\n<p>&ldquo;You recover the bulk phase of water extremely quickly,&rdquo; Benderskii said.<\/p>\n<p>While the transition happens in the uppermost layer of water molecules, the molecules involved change constantly. Even when they rise to the top layer, molecules for the most part are wholly submerged, spending only a quarter of their time straddling air and water.<\/p>\n<p>The study raises the question of how exactly to define the air-water boundary.<\/p>\n<p>If the straddling molecules constitute the boundary, it would be analogous to a wood fence where three of every four boards are missing &mdash; except that since water molecules always are moving between submerged and straddling positions, the location of the fourth board would change millions of times per second.<\/p>\n<p>If the boundary were the entire top layer of water molecules, the analogy would be a fence where one in four boards is sticking out at any one time.<\/p>\n<p>A physical chemist, Benderskii began the study at Wayne State University in Detroit before joining USC Dornsife in 2009.<\/p>\n<p>Benderskii&rsquo;s collaborators were lead author Igor Stiopkin, formerly at Wayne State and now at the University of Wisconsin-Madison; Champika Weeraman, also previously at Wayne State and now at Canada&rsquo;s National Research Council in Ottawa; Piotr Pieniazek and James Skinner of the University of Wisconsin-Madison; and Fadel Shalhout, formerly at Wayne State and now at USC Dornsife.<\/p>\n<p>The National Science Foundation and the U.S. Department of Energy funded the study.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Some water molecules split the difference between gas and liquid, a study in <em>Nature<\/em> shows.<\/p>\n","protected":false},"author":0,"featured_media":11249,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[1799,78,65,96,89],"class_list":["post-11246","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faculty","tag-alexander-benderskii","tag-chemistry","tag-environment","tag-natural-sciences","tag-water"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Water\u2019s Surface Not All Wet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/waters-surface-not-all-wet\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" 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