{"id":1277,"date":"2021-12-09T11:24:34","date_gmt":"2021-12-09T10:24:34","guid":{"rendered":"https:\/\/iop.fnwi.uva.nl\/scm\/wordpress_test\/?p=1277"},"modified":"2026-10-19T21:35:49","modified_gmt":"2026-10-19T20:35:49","slug":"complex-fluids","status":"publish","type":"post","link":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/2021\/12\/09\/complex-fluids\/","title":{"rendered":"Dynamics of complex fluids"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1277\" class=\"elementor elementor-1277\" data-elementor-settings=\"[]\">\n\t\t\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0f54c36 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0f54c36\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8e14f12\" data-id=\"8e14f12\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b281a37 elementor-widget elementor-widget-text-editor\" data-id=\"b281a37\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.5.5 - 03-02-2022 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#818a91;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#818a91;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t\n<div style=\"color:#43545A; font-family:inherit; line-height:1.7;\">\n\n  <!-- OPENING -->\n  <p style=\"font-size:19px; line-height:1.7; margin:0 0 18px 0;\">\n    <strong style=\"font-weight:600; color:#344A52;\">\n      How can we make agricultural spraying more effective while reducing its environmental impact? Tiny droplets can drift away in the wind, while others bounce straight off plant leaves. Understanding how complex fluids behave offers new ways to tackle both challenges.\n    <\/strong>\n  <\/p>\n\n  <p style=\"font-size:19px; line-height:1.7; margin:0 0 30px 0;\">\n    In the Soft Matter group, we combine high-speed imaging, fluid mechanics, and rheology to explore how polymers, surfactants, and emulsions influence droplet formation, impact, and flow. Our research connects fundamental fluid physics with smarter spray formulations.\n  <\/p>\n\n  <!-- RESEARCH THEMES -->\n  <div style=\"margin:28px 0 34px 0; border-top:1px solid #DCE7EA;\">\n\n    <div style=\"padding:19px 0; border-bottom:1px solid #DCE7EA;\">\n      <div style=\"font-size:12px; letter-spacing:1.3px; color:#10708A; font-weight:700; margin-bottom:5px;\">\n        01 \/ SPRAY FORMATION\n      <\/div>\n      <div style=\"font-size:18px; font-weight:600; color:#304750; margin-bottom:5px;\">\n        Bigger droplets, less drift\n      <\/div>\n      <p style=\"font-size:16px; margin:0; line-height:1.65;\">\n        We investigate how polymer additives alter liquid-sheet breakup and droplet size, helping reduce spray drift while maintaining effective coverage.\n      <\/p>\n    <\/div>\n\n    <div style=\"padding:19px 0; border-bottom:1px solid #DCE7EA;\">\n      <div style=\"font-size:12px; letter-spacing:1.3px; color:#10708A; font-weight:700; margin-bottom:5px;\">\n        02 \/ DROPLET IMPACT\n      <\/div>\n      <div style=\"font-size:18px; font-weight:600; color:#304750; margin-bottom:5px;\">\n        Making droplets stick\n      <\/div>\n      <p style=\"font-size:16px; margin:0; line-height:1.65;\">\n        By studying droplet impacts on water-repellent surfaces, we reveal how dynamic surface tension controls spreading, retraction, and bounce-off.\n      <\/p>\n    <\/div>\n\n    <div style=\"padding:19px 0; border-bottom:1px solid #DCE7EA;\">\n      <div style=\"font-size:12px; letter-spacing:1.3px; color:#10708A; font-weight:700; margin-bottom:5px;\">\n        03 \/ COMPLEX FLUID PHYSICS\n      <\/div>\n      <div style=\"font-size:18px; font-weight:600; color:#304750; margin-bottom:5px;\">\n        When liquids behave differently\n      <\/div>\n      <p style=\"font-size:16px; margin:0; line-height:1.65;\">\n        From stretching polymer filaments to stabilising emulsions, we uncover how elasticity, flow history, and interfacial interactions shape fluid behaviour.\n      <\/p>\n    <\/div>\n\n  <\/div>\n\n  <!-- PUBLICATIONS -->\n  <h3 style=\"font-size:23px; font-weight:650; color:#243E47; margin:0 0 8px 0;\">\n    Research Highlights\n  <\/h3>\n  <p style=\"font-size:16px; color:#667A80; margin:0 0 22px 0;\">\n    Selected publications from our work on sprays, droplet impact, and polymer dynamics.\n  <\/p>\n\n  <div style=\"background:#F3F8F9; border-radius:12px; padding:8px 22px; margin-bottom:28px;\">\n\n    <!-- PAPER 1 -->\n    <div style=\"padding:18px 0; border-bottom:1px solid #DCE7EA;\">\n      <div style=\"font-size:12px; font-weight:700; color:#10708A; letter-spacing:1px; margin-bottom:7px;\">\n        SPRAY PHYSICS &nbsp;\u00b7&nbsp; 2022\n      <\/div>\n      <a href=\"https:\/\/doi.org\/10.1016\/j.jnnfm.2022.104813\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"font-size:18px; line-height:1.5; font-weight:600; color:#10708A; text-decoration:none;\">\n        What determines the drop size in sprays of polymer solutions? &nearr;\n      <\/a>\n      <p style=\"font-size:14px; color:#73858B; margin:6px 0;\">\n        A. Gaillard, R. Sijs &amp; D. Bonn \u00b7 <em>Journal of Non-Newtonian Fluid Mechanics<\/em>\n      <\/p>\n      <p style=\"font-size:16px; margin:8px 0 0 0; line-height:1.6;\">\n        Revealing how polymer elasticity changes spray breakup and produces larger droplets with the potential to reduce drift.\n      <\/p>\n    <\/div>\n\n    <!-- PAPER 2 -->\n    <div style=\"padding:18px 0; border-bottom:1px solid #DCE7EA;\">\n      <div style=\"font-size:12px; font-weight:700; color:#10708A; letter-spacing:1px; margin-bottom:7px;\">\n        POLYMER DYNAMICS &nbsp;\u00b7&nbsp; 2025\n      <\/div>\n      <a href=\"https:\/\/doi.org\/10.1017\/jfm.2024.1222\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"font-size:18px; line-height:1.5; font-weight:600; color:#10708A; text-decoration:none;\">\n        When does the elastic regime begin in viscoelastic pinch-off? &nearr;\n      <\/a>\n      <p style=\"font-size:14px; color:#73858B; margin:6px 0;\">\n        A. Gaillard et al. \u00b7 <em>Journal of Fluid Mechanics<\/em>\n      <\/p>\n      <p style=\"font-size:16px; margin:8px 0 0 0; line-height:1.6;\">\n        Identifying the critical moment when polymer elasticity begins to dominate the thinning and breakup of liquid filaments.\n      <\/p>\n    <\/div>\n\n    <!-- PAPER 3 -->\n    <div style=\"padding:18px 0;\">\n      <div style=\"font-size:12px; font-weight:700; color:#10708A; letter-spacing:1px; margin-bottom:7px;\">\n        DROPLET DEPOSITION &nbsp;\u00b7&nbsp; 2021\n      <\/div>\n      <a href=\"https:\/\/doi.org\/10.1103\/PhysRevFluids.6.033601\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"font-size:18px; line-height:1.5; font-weight:600; color:#10708A; text-decoration:none;\">\n        Controlling droplet deposition with surfactants &nearr;\n      <\/a>\n      <p style=\"font-size:14px; color:#73858B; margin:6px 0;\">\n        H. Hoffman, R. Sijs, T. de Goede &amp; D. Bonn \u00b7 <em>Physical Review Fluids<\/em>\n      <\/p>\n      <p style=\"font-size:16px; margin:8px 0 0 0; line-height:1.6;\">\n        Demonstrating why the rapidly changing surface tension of droplets is crucial for efficient wetting and deposition.\n      <\/p>\n    <\/div>\n\n  <\/div>\n\n  <!-- CONTACT -->\n  <p style=\"font-size:15px; color:#667A80; margin:0; padding-top:15px; border-top:1px solid #DCE7EA;\">\n    <strong style=\"color:#344A52;\">Research contact:<\/strong>\n    Daniel Bonn &nbsp;\u00b7&nbsp;\n    <a href=\"mailto:d.bonn@uva.nl\" style=\"color:#10708A; text-decoration:none;\">\n      d.bonn@uva.nl &nearr;\n    <\/a>\n  <\/p>\n\n<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>How can we make agricultural spraying more effective while reducing its environmental impact? Tiny droplets can drift away in the wind, while others bounce straight off plant leaves. Understanding how complex fluids behave offers new ways to tackle both challenges. In the Soft Matter group, we combine high-speed imaging, fluid mechanics, and rheology to explore [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1668,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15],"tags":[],"_links":{"self":[{"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/posts\/1277"}],"collection":[{"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/comments?post=1277"}],"version-history":[{"count":10,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/posts\/1277\/revisions"}],"predecessor-version":[{"id":5029,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/posts\/1277\/revisions\/5029"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/media\/1668"}],"wp:attachment":[{"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/media?parent=1277"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/categories?post=1277"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iop.fnwi.uva.nl\/scm\/index.php\/wp-json\/wp\/v2\/tags?post=1277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}