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With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and" /> <meta name="twitter:image" content="https://0.academia-photos.com/19603463/5466049/6231378/s200_jayne.wu.jpg" /> <meta property="fb:app_id" content="2369844204" /> <meta property="og:type" content="article" /> <meta property="og:url" content="https://www.academia.edu/15156653/ac_electro_osmotic_micropump_by_asymmetric_electrode_polarization" /> <meta property="og:title" content="ac electro-osmotic micropump by asymmetric electrode polarization" /> <meta property="og:image" content="http://a.academia-assets.com/images/open-graph-icons/fb-paper.gif" /> <meta property="og:description" content="ac electro-osmosis ACEO has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and" /> <meta property="article:author" content="https://utk.academia.edu/JayneWu" /> <meta property="article:author" content="https://independent.academia.edu/JWu7" /> <meta name="description" content="ac electro-osmosis ACEO has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and" /> <title>(PDF) ac electro-osmotic micropump by asymmetric electrode polarization</title> <link rel="canonical" href="https://www.academia.edu/15156653/ac_electro_osmotic_micropump_by_asymmetric_electrode_polarization" /> <script async src="https://www.googletagmanager.com/gtag/js?id=G-5VKX33P2DS"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-5VKX33P2DS', { cookie_domain: 'academia.edu', send_page_view: false, }); gtag('event', 'page_view', { 'controller': "single_work", 'action': "show", 'controller_action': 'single_work#show', 'logged_in': 'false', 'edge': 'unknown', // Send nil if there is no A/B test bucket, in case some records get logged // with missing data - that way we can distinguish between the two cases. // ab_test_bucket should be of the form <ab_test_name>:<bucket> 'ab_test_bucket': null, }) </script> <script> var $controller_name = 'single_work'; var $action_name = "show"; var $rails_env = 'production'; var $app_rev = '10e3dae8ffd20c8f5a4f7002303d92ad374c73ee'; var $domain = 'academia.edu'; var $app_host = "academia.edu"; var $asset_host = "academia-assets.com"; var $start_time = new Date().getTime(); var $recaptcha_key = "6LdxlRMTAAAAADnu_zyLhLg0YF9uACwz78shpjJB"; var $recaptcha_invisible_key = "6Lf3KHUUAAAAACggoMpmGJdQDtiyrjVlvGJ6BbAj"; var $disableClientRecordHit = false; </script> <script> window.require = { config: function() { return function() {} } } </script> <script> window.Aedu = window.Aedu || {}; window.Aedu.hit_data = null; window.Aedu.serverRenderTime = new Date(1733263628000); window.Aedu.timeDifference = new Date().getTime() - 1733263628000; </script> <script type="application/ld+json">{"@context":"https://schema.org","@type":"ScholarlyArticle","abstract":"ac electro-osmosis \u0001ACEO has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and electrokinetic surface flows can be induced by nonuniform electrical fields. To implement ACEO micropump, asymmetry in an electrode pair is essential to generate net flow, which has been typically achieved through asymmetric electrode geometries. This work proposes asymmetric electrode polarization processes to break the electrode symmetry. A dc bias is superimposed onto ac potentials, so that the two electrodes in a pair undergo capacitive charging or Faradaic charging separately. Applying such signals, pumping action has been demonstrated with only a few volts of applied voltage and a power consumption in the range of milliwatts. Pumping velocity by asymmetric electrode polarization exhibits an exponential dependency on voltage.","author":[{"@context":"https://schema.org","@type":"Person","name":"Jayne Wu"},{"@context":"https://schema.org","@type":"Person","name":"J. Wu"}],"contributor":[{"@context":"https://schema.org","@type":"Person","name":"J. Wu"}],"dateCreated":"2015-08-24","dateModified":"2015-08-27","headline":"ac electro-osmotic micropump by asymmetric electrode polarization","image":"https://attachments.academia-assets.com/38560858/thumbnails/1.jpg","inLanguage":"en","keywords":["Microfluidics","Lab On A Chip","Electrokinetics in Microfluidics","Microfluidics, Bio-MEMS, MEMS","Microfluidics and Nanofluidics"],"publisher":{"@context":"https://schema.org","@type":"Organization","name":null},"sourceOrganization":[{"@context":"https://schema.org","@type":"EducationalOrganization","name":"utk"},{"@context":"https://schema.org","@type":"EducationalOrganization","name":null}],"thumbnailUrl":"https://attachments.academia-assets.com/38560858/thumbnails/1.jpg","url":"https://www.academia.edu/15156653/ac_electro_osmotic_micropump_by_asymmetric_electrode_polarization"}</script><link rel="stylesheet" media="all" 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"https://www.academia.edu/login?post_login_redirect_url=https%3A%2F%2Fwww.academia.edu%2F15156653%2Fac_electro_osmotic_micropump_by_asymmetric_electrode_polarization%3Fauto%3Ddownload"; window.loswp.translateUrl = "https://www.academia.edu/login?post_login_redirect_url=https%3A%2F%2Fwww.academia.edu%2F15156653%2Fac_electro_osmotic_micropump_by_asymmetric_electrode_polarization%3Fshow_translation%3Dtrue"; window.loswp.previewableAttachments = [{"id":38560858,"identifier":"Attachment_38560858","shouldShowBulkDownload":false}]; window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":15156653,"created_at":"2015-08-24T17:26:33.714-07:00","from_world_paper_id":null,"updated_at":"2021-01-16T08:18:29.358-08:00","_data":{"abstract":"ac electro-osmosis \u0001ACEO has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and electrokinetic surface flows can be induced by nonuniform electrical fields. To implement ACEO micropump, asymmetry in an electrode pair is essential to generate net flow, which has been typically achieved through asymmetric electrode geometries. This work proposes asymmetric electrode polarization processes to break the electrode symmetry. A dc bias is superimposed onto ac potentials, so that the two electrodes in a pair undergo capacitive charging or Faradaic charging separately. Applying such signals, pumping action has been demonstrated with only a few volts of applied voltage and a power consumption in the range of milliwatts. Pumping velocity by asymmetric electrode polarization exhibits an exponential dependency on voltage. "},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"ac electro-osmotic micropump by asymmetric electrode polarization","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [34287276,19603463]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "control"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId = 'edu.academia.applesignon';</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div class="ds-work-card--grid-container"><div class="ds-work-card--container js-loswp-work-card"><div class="ds-work-card--cover"><div class="ds-work-cover--wrapper"><div class="ds-work-cover--container"><button class="ds-work-cover--clickable js-swp-download-button" data-signup-modal="{"location":"swp-splash-paper-cover","attachmentId":38560858,"attachmentType":"pdf"}"><img alt="First page of “ac electro-osmotic micropump by asymmetric electrode polarization”" class="ds-work-cover--cover-thumbnail" src="https://0.academia-photos.com/attachment_thumbnails/38560858/mini_magick20190224-18964-731ndc.png?1551067969" /><img alt="PDF Icon" class="ds-work-cover--file-icon" src="//a.academia-assets.com/assets/single_work_splash/adobe.icon-574afd46eb6b03a77a153a647fb47e30546f9215c0ee6a25df597a779717f9ef.svg" /><div class="ds-work-cover--hover-container"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span><p>Download Free PDF</p></div><div class="ds-work-cover--ribbon-container">Download Free PDF</div><div class="ds-work-cover--ribbon-triangle"></div></button></div></div></div><div class="ds-work-card--work-information"><h1 class="ds-work-card--work-title">ac electro-osmotic micropump by asymmetric electrode polarization</h1><div class="ds-work-card--work-authors ds-work-card--detail"><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="34287276" href="https://independent.academia.edu/JWu7"><img alt="Profile image of J. Wu" class="ds-work-card--author-avatar" src="//a.academia-assets.com/images/s65_no_pic.png" />J. Wu</a><a class="ds-work-card--author js-wsj-grid-card-author ds2-5-body-md ds2-5-body-link" data-author-id="19603463" href="https://utk.academia.edu/JayneWu"><img alt="Profile image of Jayne Wu" class="ds-work-card--author-avatar" src="https://0.academia-photos.com/19603463/5466049/6231378/s65_jayne.wu.jpg" />Jayne Wu</a></div><div class="ds-work-card--detail"></div><p class="ds-work-card--work-abstract ds-work-card--detail ds2-5-body-md">ac electro-osmosis ACEO has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and electrokinetic surface flows can be induced by nonuniform electrical fields. To implement ACEO micropump, asymmetry in an electrode pair is essential to generate net flow, which has been typically achieved through asymmetric electrode geometries. This work proposes asymmetric electrode polarization processes to break the electrode symmetry. A dc bias is superimposed onto ac potentials, so that the two electrodes in a pair undergo capacitive charging or Faradaic charging separately. Applying such signals, pumping action has been demonstrated with only a few volts of applied voltage and a power consumption in the range of milliwatts. Pumping velocity by asymmetric electrode polarization exhibits an exponential dependency on voltage. </p><div class="ds-work-card--button-container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--work-card","attachmentId":38560858,"attachmentType":"pdf","workUrl":"https://www.academia.edu/15156653/ac_electro_osmotic_micropump_by_asymmetric_electrode_polarization"}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--work-card","attachmentId":38560858,"attachmentType":"pdf","workUrl":"https://www.academia.edu/15156653/ac_electro_osmotic_micropump_by_asymmetric_electrode_polarization"}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div></div><div data-auto_select="false" data-client_id="331998490334-rsn3chp12mbkiqhl6e7lu2q0mlbu0f1b" 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data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Toward High Net Velocities in AC Electroosmotic Micropumps Based on Asymmetric Coplanar Electrodes","attachmentId":48850188,"attachmentType":"pdf","work_url":"https://www.academia.edu/6479398/Toward_High_Net_Velocities_in_AC_Electroosmotic_Micropumps_Based_on_Asymmetric_Coplanar_Electrodes","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/6479398/Toward_High_Net_Velocities_in_AC_Electroosmotic_Micropumps_Based_on_Asymmetric_Coplanar_Electrodes"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="72849620" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/72849620/Ac_Electroosmotic_Pumping_Induced_by_Noncontact_External_Electrodes">Ac Electroosmotic Pumping Induced by Noncontact External Electrodes</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="15089223" href="https://nd.academia.edu/HsuehChiaChang">Hsueh-Chia Chang</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Biomicrofluidics, 2007</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Ac Electroosmotic Pumping Induced by Noncontact External Electrodes","attachmentId":81611146,"attachmentType":"pdf","work_url":"https://www.academia.edu/72849620/Ac_Electroosmotic_Pumping_Induced_by_Noncontact_External_Electrodes","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/72849620/Ac_Electroosmotic_Pumping_Induced_by_Noncontact_External_Electrodes"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="9529370" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/9529370/Ultrafast_micropumping_by_biased_alternating_current_electrokinetics">Ultrafast micropumping by biased alternating current electrokinetics</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="19603463" href="https://utk.academia.edu/JayneWu">Jayne Wu</a></div><p class="ds-related-work--abstract ds2-5-body-sm">This paper reports dramatic improvements in ﬂow rate over conventional alternating current ac electrokinetic micropumps by exploiting asymmetry in electric potentials over the electrodes. A micropump consisting of a planar asymmetric electrode array was tested using ac signals with and without a direct current dc bias. All experiments were done at 100 kHz Vac. The pumping velocity is much faster with a dc voltage, in some cases by an order of magnitude, reaching a linear velocity of up to 2.5 mm/s with only 5.4 Vrms. The discovery presents an exciting opportunity for microﬂuidics. Future improvement can be anticipated with additional optimization.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Ultrafast micropumping by biased alternating current electrokinetics","attachmentId":35752822,"attachmentType":"pdf","work_url":"https://www.academia.edu/9529370/Ultrafast_micropumping_by_biased_alternating_current_electrokinetics","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/9529370/Ultrafast_micropumping_by_biased_alternating_current_electrokinetics"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div></div></div><div class="ds-sticky-ctas--wrapper js-loswp-sticky-ctas hidden"><div class="ds-sticky-ctas--grid-container"><div class="ds-sticky-ctas--container"><button class="ds2-5-button js-swp-download-button" data-signup-modal="{"location":"continue-reading-button--sticky-ctas","attachmentId":38560858,"attachmentType":"pdf","workUrl":null}">See full PDF</button><button class="ds2-5-button ds2-5-button--secondary js-swp-download-button" data-signup-modal="{"location":"download-pdf-button--sticky-ctas","attachmentId":38560858,"attachmentType":"pdf","workUrl":null}"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">download</span>Download PDF</button></div></div></div><div class="ds-below-fold--grid-container"><div class="ds-work--container js-loswp-embedded-document"><div class="attachment_preview" data-attachment="Attachment_38560858" style="display: none"><div class="js-scribd-document-container"><div class="scribd--document-loading js-scribd-document-loader" style="display: block;"><img alt="Loading..." src="//a.academia-assets.com/images/loaders/paper-load.gif" /><p>Loading Preview</p></div></div><div style="text-align: center;"><div class="scribd--no-preview-alert js-preview-unavailable"><p>Sorry, preview is currently unavailable. 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