{"id":22080,"date":"2024-03-05T13:34:23","date_gmt":"2024-03-05T13:34:23","guid":{"rendered":"https:\/\/www.leibniz-inm.de\/?page_id=22080"},"modified":"2026-04-08T11:15:54","modified_gmt":"2026-04-08T11:15:54","slug":"interactive-surfaces","status":"publish","type":"page","link":"https:\/\/www.leibniz-inm.de\/en\/research\/scientific-units\/interactive-surfaces\/","title":{"rendered":"Interactive Surfaces"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p class=\"has-medium-font-size\">Our research department studies the mechanical properties of materials with a focus on surfaces. We aim to understand mechanisms of adhesion, friction, and wear through innovative experiments and to contribute to the design of new materials with mechanical functions. Example projects address the contact mechanics of novel lubricants, the nanomechanics of biomaterials, and the tactile perception of micro-structured materials.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\"><\/div>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.inm-person,.inm-page{background:var(--color-gray);margin-bottom:5rem}@media (max-width:767px){.inm-person,.inm-page{padding-bottom:2rem}}.inm-person .members-item_name,.inm-page .members-item_name{font-weight:bold;line-height:1.2;font-size:3rem;min-height:0vw;color:var(--color-almost-dark);margin-bottom:1rem}.inm-person .members-item_name h1,.inm-person .members-item_name h2,.inm-person .members-item_name h3,.inm-person .members-item_name h4,.inm-person .members-item_name h5,.inm-person .members-item_name h6,.inm-page .members-item_name h1,.inm-page .members-item_name h2,.inm-page 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.members-item_image{margin-top:0}}.wp-block-columns:has(.tile){gap:1.5rem;margin-bottom:1.5rem}.inm-page.tile img{object-fit:cover !important}.inm-page.tile .page-item_image{height:200px !important}.inm-page.tile .page-item_content h2{margin:0;font-size:2.5rem;line-height:1.2}<\/style><div class=\"inm-person image-right\">\r\n    <div class=\"container\">\r\n        <div class=\"members-item\">\r\n                            <div class=\"members-item_image\">\r\n                    <img width=\"1000\" height=\"800\" src=\"https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz.png\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"Prof. Dr. Roland Bennewitz, INM \u2013 Leibniz-Institut f\u00fcr Neue Materialien gGmbH\" srcset=\"https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz.png 1000w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-309x247.png 309w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-300x240.png 300w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-768x614.png 768w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-480x384.png 480w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-244x195.png 244w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-310x248.png 310w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-960x768.png 960w, https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-620x496.png 620w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>                <\/div>\r\n                <div class=\"members-item_content\">\r\n                                            <div class=\"members-item_name\">Prof. Dr. Roland Bennewitz<\/div>\r\n                                        \r\n                    Head of Interactive Surfaces\r\n                                            <div class=\"members-item_phone\">Telefon:  +49 (0)681-9300-213<\/div>\r\n                        \r\n                        \r\n                                            <div class=\"members-item_email\">E-mail: <a href=\"mailto:Roland.Bennewitz@leibniz-inm.de\">Roland.Bennewitz@leibniz-inm.de<\/a><\/div>\r\n                                        <div class=\"publications-item_button\">\r\n                        <a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-bennewitz-roland\/\">More information<\/a>\r\n                    <\/div>\r\n                <\/div>\r\n                    <\/div>\r\n    <\/div>\r\n<\/div>\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Team Members<\/summary><style>.inm-members{gap:3rem;margin-bottom:6rem}.inm-members .members-item_name{display:block;font-weight:bold;font-size:1.4rem;margin-bottom:0;line-height:1.2}.inm-members .members-item_name h1,.inm-members .members-item_name h2,.inm-members .members-item_name h3,.inm-members .members-item_name h4,.inm-members .members-item_name h5,.inm-members .members-item_name h6{margin:0}.inm-members .members-item_name a{text-decoration:none;color:var(--color-text)}.inm-members p{margin:0 0 0}.inm-members .members-item{border-bottom:2px solid var(--color-gray);padding:0 0 1.5rem;box-sizing:border-box}<\/style><div class=\"inm-members-wrap aaa\">\r\n    <div class=\"inm-members grid\">\r\n        \r\n                        <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Roland-Bennewitz-150x150.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-bennewitz-roland\/\">\r\n                Prof. Dr. Roland Bennewitz            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Head of Interactive Surfaces\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-213<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: Roland.Bennewitz@leibniz-inm.de<\/div>\r\n    \r\n            <div class=\"members-item_orcid\">ORCID: <a aria-label=\"orcid\" href=\"https:\/\/orcid.org\/0000-0002-5464-8190\">https:\/\/orcid.org\/0000-0002-5464-8190<\/a><\/div>\r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Faller-Fabian-150x150.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/faller-fabian\/\">\r\n                Fabian Faller            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Technician\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-239<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: fabian.faller@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/b-sc-fehlberg-maja\/\">\r\n                B.Sc. Maja Fehlberg            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Doctoral Student\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-282<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: maja.fehlberg@leibniz-inm.de<\/div>\r\n    \r\n            <div class=\"members-item_orcid\">ORCID: <a aria-label=\"orcid\" href=\"https:\/\/orcid.org\/0000-0002-1827-2333\">https:\/\/orcid.org\/0000-0002-1827-2333<\/a><\/div>\r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/fett-yan\/\">\r\n                M.Sc. Yan Fett            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Doctoral Student\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-238<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: yan.fett@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/dr-goektepe-mustafa-nedim\/\">\r\n                Dr. Mustafa Nedim G\u00f6ktepe            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Research Scientist\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-359<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: mustafa.goektepe@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/m-sc-karmrodt-marvin\/\">\r\n                M.Sc. Marvin Karmrodt            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Doctoral Student\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-327<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: marvin.karmrodt@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/03\/Melnyk-Inga-150x150.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/dr-melnyk-inga\/\">\r\n                Dr. Inga Melnyk            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Research Scientist\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-330<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: inga.melnyk@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/pelster-luca-enrico-karl\/\">\r\n                Luca Enrico Karl Pelster            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Student Assistant\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-108\/251<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: luca.pelster@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/m-sc-saikumar-sairam\/\">\r\n                M.Sc. Sairam Saikumar            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Doctoral Student\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-272<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: sairam.saikumar@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                                <div class=\"members-item\">\r\n                    <div class=\"members-item_content\">\r\n                            \r\n    <div class='members-item_image'><img class='placeholder-staff' src='https:\/\/www.leibniz-inm.de\/wp-content\/themes\/inm\/images\/favicon.png' alt='' \/><\/div>        <div class=\"members-item_name\">\r\n            <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/weinand-leopold\/\">\r\n                Leopold Weinand            <\/a>\r\n        <\/div>\r\n    \r\n    \r\n    Bachelor-Student\/in\r\n            <div class=\"members-item_phone\">Phone:  +49 (0)681-9300-238<\/div>\r\n    \r\n    \r\n            <div class=\"members-item_email\">E-mail: leopold.weinand@leibniz-inm.de<\/div>\r\n    \r\n    \r\n    \r\n                               <\/div>\r\n                <\/div>\r\n                    <\/div>\r\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Research<\/summary>\n<h3 class=\"wp-block-heading\">Molecular mechanics of soft matter<\/h3>\n\n\n\n<p>We use high-resolution force microscopy (AFM) in aqueous solution to study molecular forces at the surface of soft matter. Single-molecule force spectroscopy on hydrogels contributes to the understanding and control of the mechanisms of bioadhesion and mechanotransduction on biomaterials. In active materials, we employ light-activated molecular motors for the mechanical stimulation. For rapid force measurements on the single-molecular level, we develop novel high-throughput techniques based on tethered-particle motion in microfluidic devices.<\/p>\n\n\n\n<p>Relevant publications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2590006422001211\">B. Li, A. \u00c7olak et al.,<br>Molecular stiffness cues of an interpenetrating network hydrogel for cell adhesion<br>Materials Today Bio, 15 (2022) 100323.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/doi.org\/10.1038\/s41467-021-23815-4\">Y. Zheng, M.K.L. Han, R. Zhao, J. Blass, et al.,<br>Optoregulated force application to cellular receptors using molecular motors<br>Nature Communications, 12 (2021) 3580.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/doi.org\/10.1039\/D0NR06865A\">M. Penth et al.,<br>Nanomechanics of self-assembled DNA building blocks<br>Nanoscale, 13 (2021) 9371-9380.<\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/dx.doi.org\/10.1039\/C9NR01784D\">Colak, B. Li, et al.,<br>The mechanics of single cross-links which mediate cell attachment at a hydrogel surface<br>Nanoscale, 11 (2019) 11596-11604.<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Nanotribology<\/h3>\n\n\n\n<p>Friction force microscopy in ultra-high vacuum or in aqueous solutions reveals molecular mechanisms of friction. As one example, we investigate the limits of superlubricity in 2D materials under high local pressure. We also move our research towards a nanotribology of hydrogels and study dissipative interactions of single fluctuating polymers.<\/p>\n\n\n\n<p>Relevant publications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/doi.org\/10.1103\/PhysRevResearch.5.L012049\">B. Szczefanowicz, et al.,<br>Formation of intermittent covalent bonds at high contact pressure limits superlow friction on epitaxial graphene,<br>Physical Review Research, 5 (2023) L012049.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.langmuir.3c03190\">K. Schellnhuber et al.,<br>Single-Polymer Friction Force Microscopy of dsDNA Interacting with a Nanoporous Membrane,<br>Langmuir, 40 (2024) 968-974.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pubs.rsc.org\/en\/content\/articlelanding\/2023\/nr\/d3nr00138e\">Z. Liu et al.,<br>Nanoscale friction on MoS2\/graphene heterostructures,<br>Nanoscale, 15 (2023) 5809-5815.<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Tactile perception of materials<\/h3>\n\n\n\n<p>Fingertip friction plays a key role in the tactile exploration of materials and in the perception of material properties and surfaces structures. We implement psychophysical studies to find correlations between fingertip friction and individual judgement on touch of materials.<\/p>\n\n\n\n<p>Relevant publications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/doi.org\/10.1038\/s41598-020-72890-y\">R. Sahli et al.,<br>Tactile perception of randomly rough surfaces<br>Scientific Reports, 10 (2020) 15800.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/abs\/10.1002\/admi.202101380\">Gedsun et al.,<br>Bending as Key Mechanism in the Tactile Perception of Fibrillar Surfaces<br>Advanced Materials Interfaces, 9 (2022) 2101380.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/2023.worldhaptics.org\/work-in-progress\/\">M. Fehlberg et al.,<br>Perception of Friction in Tactile Exploration of Micro-structured Rubber Samples,<br>in Haptics: Science, Technology, Applications, Springer 2022, pp. 21-29.<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Materials for the future of tactile communication<\/h3>\n\n\n\n<p>Materials with switchable surface structure offer opportunities to quickly convey information to humans by varying the touch experience. We develop micro-structured elastomers which change the surface shape by applied electric fields or pneumatic mechanisms. The sensory reaction to such stimulation of touch is evaluated by EEG and MEG experiments.<\/p>\n\n\n\n<p>Relevant publications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/doi.org\/10.1007\/s11249-017-0969-7\">N. \u00d6zg\u00fcn et al.,<br>Tribology of a Braille Display and EEG Correlates<br>Tribol. Lett., 66 (2018) 16.<\/a><\/li>\n<\/ul>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<\/details>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Publications<\/h2>\n\n\n<style>.inm-publications{margin-bottom:6rem}.inm-publications .publications-item{background:var(--color-gray);padding:0;box-sizing:border-box;margin:0 0 2.5rem}.inm-publications .publications-item_content .publications-content,.inm-publications .publications-item_content .publications-image{padding:2rem}.inm-publications .publications-item_content .publications-image{padding-bottom:0}@media (min-width:768px){.inm-publications .publications-item_content{display:flex;gap:0;align-items:stretch;justify-content:space-between}.inm-publications .publications-item_content .publications-image{max-width:115px;min-width:115px;box-sizing:content-box}.inm-publications .publications-item_content 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2.5rem}}.doi-abstract-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:1.5rem;margin-bottom:0;line-height:1}.abstract-toggle{background:none;border:none;font-weight:normal;cursor:pointer;color:#000;padding:0;width:auto;min-width:0px;margin-right:40px;padding-left:25px;position:relative;overflow:visible}.abstract-toggle:before{content:\"\";width:16px;height:16px;background:url(\/wp-content\/themes\/inm\/images\/icon_plus.svg) left center no-repeat;background-size:98%;position:absolute;left:0;top:50%;transform:translate(0, -54%)}.abstract-toggle.active{font-weight:700}.abstract-toggle.active:before{background:url(\/wp-content\/themes\/inm\/images\/icon_minus.svg) left center no-repeat;background-size:98%}.publication-abstract{line-height:1.5;max-height:0;opacity:0;overflow:hidden;transition:max-height 0.4s ease, opacity 0.4s ease}.publication-abstract.open{max-height:1000px;opacity:1}.doi-mobile{display:none;margin-top:1rem}@media (max-width:767px){.abstract-toggle+.doi{display:none}.doi-mobile{display:block}}<\/style>\n<div class=\"inm-publications-wrap\" id=\"publications\">\n    <div class=\"inm-publications\">\n        \n                        <div class=\"publications-item radius-20\">\n                    <div class=\"publications-item_content\">\n                        <div class=\"publications-image\">                                <img width=\"115\" height=\"150\" src=\"https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2025\/08\/A-Touch-of-Stribeck-Finger-Pad-Friction-in-Viscous-Liquid-Spreading.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" \/>                            <\/div>\n                        <div class=\"publications-content\">\n                            <div class=\"publications-item_name\">A Touch of Stribeck &#8211; Finger-Pad Friction in Viscous Liquid Spreading<\/div>\n                            <div class=\"publications-item_details\">\n                                <p><a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/b-sc-fehlberg-maja\/\">Fehlberg, Maja<\/a> | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/m-sc-schmidt-dominik-sebastian\/\">Schmidt, Dominik S.<\/a> | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/m-sc-saikumar-sairam\/\">Saikumar, Sairam<\/a> | Cavdan, M\u00fcge | Drewing, Knut | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-bennewitz-roland\/\">Bennewitz, Roland<\/a><\/p>\n                            \n                                                                    <p class=\"doi-abstract-row\">\n                                                                                    <button class=\"abstract-toggle\" data-target=\"abstract-38141\">\n                                                Abstract                                            <\/button>\n                                                                            \n                                                                                    <span class=\"doi\">DOI:\n                                            <a href=\"https:\/\/dx.doi.org\/10.1007\/s11249-025-02024-w\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                                10.1007\/s11249-025-02024-w                                            <\/a><\/span>\n                                                                            \n                                    <\/p>\n                                \n                                                                            <div id=\"abstract-38141\" class=\"publication-abstract\">\n                                            <p>Friction was studied for the human finger pad during the spreading of viscous liquid samples in circular motion on a solid substrate. The samples included both Newtonian and shear-thinning liquids with a range of viscosity between 0.83 mPa s and 150 Pa s. During active touch, participants applied varying normal forces and sliding speeds depending on the sample and individual behavior. Friction coefficients vary greatly between participants, but fall on one Stribeck curve when shear-thinning effects were accounted for full-film lubrication. A comparison with the measured height variations during spreading demonstrates that the logarithm of the Hersey number is an instantaneous indicator of the film thickness in the full-film lubrication regime. Comparison of the measured friction coefficients with reported values of the perceived slipperiness for the same samples shows a close correspondence along the Stribeck curve.<\/p>\n                                        <\/div>\n                                                                        \n                                                                            <span class=\"doi doi-mobile\">DOI:\n                                        <a href=\"https:\/\/dx.doi.org\/10.1007\/s11249-025-02024-w\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                            10.1007\/s11249-025-02024-w                                        <\/a><\/span>\n                                                                                                <\/div>\n                        <\/div>\n                        <div class=\"publications-item_button\">\n                            <div class=\"open_access_wrap\">\n                                <p>\n                                    <strong>Tribology Letters                                    , <br>\n                                    <\/strong>2025,                                     73 91.                                 <\/p>\n                                <span class=\"open_access\">OPEN ACCESS<\/span>                            <\/div>\n                            <div class=\"button_wrap\">\n                                                                    <a target=\"_blank\"\n                                       class=\"wp-block-button__link wp-element-button\"\n                                       href=\"https:\/\/dx.doi.org\/10.1007\/s11249-025-02024-w\"\n                                       aria-label=\"Read the full publication: A Touch of Stribeck &#8211; Finger-Pad Friction in Viscous Liquid Spreading\">\n                                       <span class=\"screen-reader-text\">Discover more<\/span>\n                                       <span class=\"wp-element-button_arrow\"><\/span>\n                                    <\/a>\n                                                                <\/div>\n                        <\/div>\n                    <\/div>\n                <\/div>\n                                <div class=\"publications-item radius-20\">\n                    <div class=\"publications-item_content\">\n                        <div class=\"publications-image\">                                <img width=\"115\" height=\"150\" src=\"https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/04\/inm-publication-07.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" \/>                            <\/div>\n                        <div class=\"publications-content\">\n                            <div class=\"publications-item_name\">Single-polymer friction force microscopy of dsDNA interacting with a nano-porous membrane<\/div>\n                            <div class=\"publications-item_details\">\n                                <p>Schellnhuber, Kordula | Blass, Johanna | H\u00fcbner, Hanna | Gallei, Markus | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-bennewitz-roland\/\">Bennewitz, Roland<\/a><\/p>\n                            \n                                                                    <p class=\"doi-abstract-row\">\n                                                                                    <button class=\"abstract-toggle\" data-target=\"abstract-28073\">\n                                                Abstract                                            <\/button>\n                                                                            \n                                                                                    <span class=\"doi\">DOI:\n                                            <a href=\"https:\/\/dx.doi.org\/10.1021\/acs.langmuir.3c03190\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                                10.1021\/acs.langmuir.3c03190                                            <\/a><\/span>\n                                                                            \n                                    <\/p>\n                                \n                                                                            <div id=\"abstract-28073\" class=\"publication-abstract\">\n                                            <p>Surface-grafted polymers can reduce friction between solids in liquids by compensating the normal load with osmotic pressure, but they can also contribute to friction when fluctuating polymers entangle with the sliding counter face. We have measured forces acting on a single fluctuating double-stranded DNA polymer, which is attached to the tip of an atomic force microscope and interacts intermittently with nanometer-scale methylated pores of a self-assembled polystyrene-block-poly(4-vinylpyridine) membrane. Rare binding of the polymer into the pores is followed by a stretching of the polymer between the laterally moving tip and the surface and by a force-induced detachment. We present results for the velocity dependence of detachment forces and of attachment frequency and discuss them in terms of rare excursions of the polymer beyond its equilibrium configuration.<\/p>\n                                        <\/div>\n                                                                        \n                                                                            <span class=\"doi doi-mobile\">DOI:\n                                        <a href=\"https:\/\/dx.doi.org\/10.1021\/acs.langmuir.3c03190\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                            10.1021\/acs.langmuir.3c03190                                        <\/a><\/span>\n                                                                                                <\/div>\n                        <\/div>\n                        <div class=\"publications-item_button\">\n                            <div class=\"open_access_wrap\">\n                                <p>\n                                    <strong>Langmuir                                    , <br>\n                                    <\/strong>2024,                                     40  (1), 968-974.                                 <\/p>\n                                <span class=\"open_access\">OPEN ACCESS<\/span>                            <\/div>\n                            <div class=\"button_wrap\">\n                                                                    <a target=\"_blank\"\n                                       class=\"wp-block-button__link wp-element-button\"\n                                       href=\"https:\/\/dx.doi.org\/10.1021\/acs.langmuir.3c03190\"\n                                       aria-label=\"Read the full publication: Single-polymer friction force microscopy of dsDNA interacting with a nano-porous membrane\">\n                                       <span class=\"screen-reader-text\">Discover more<\/span>\n                                       <span class=\"wp-element-button_arrow\"><\/span>\n                                    <\/a>\n                                                                <\/div>\n                        <\/div>\n                    <\/div>\n                <\/div>\n                                <div class=\"publications-item radius-20\">\n                    <div class=\"publications-item_content\">\n                        <div class=\"publications-image\">                                <img width=\"115\" height=\"150\" src=\"https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/04\/inm-publication-10.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" \/>                            <\/div>\n                        <div class=\"publications-content\">\n                            <div class=\"publications-item_name\">Bending as Key Mechanism in the Tactile Perception of Fibrillar Surfaces<\/div>\n                            <div class=\"publications-item_details\">\n                                <p>Gedsun, Angelika | Sahli, Riad | Meng, Xing | Hensel, Ren\u00e9 | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-bennewitz-roland\/\">Bennewitz, Roland<\/a><\/p>\n                            \n                                                                    <p class=\"doi-abstract-row\">\n                                                                                    <button class=\"abstract-toggle\" data-target=\"abstract-26865\">\n                                                Abstract                                            <\/button>\n                                                                            \n                                                                                    <span class=\"doi\">DOI:\n                                            <a href=\"https:\/\/dx.doi.org\/10.1002\/admi.202101380\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                                10.1002\/admi.202101380                                            <\/a><\/span>\n                                                                            \n                                    <\/p>\n                                \n                                                                            <div id=\"abstract-26865\" class=\"publication-abstract\">\n                                            <p>Abstract The touching of fibrillar surfaces elicits a broad range of affective reactions, which range from the adverse stinginess of a stiff bristle brush to the pleasant feel of velvet. To study the tactile perception of model fibrillar surfaces, a unique set of samples carrying dense, regular arrays of cylindrical microfibrils with high aspect ratio made from different elastomer materials have been created. Fibril length and material compliance are varied independently such that their respective influence on tactile perception can be elucidated. This work finds that the tactile perception of similarity between samples is dominated by bending of the fibrils under sliding touch. The results demonstrate that variations of material stiffness and of surface structure are not necessarily perceived independently by touch. In the case of fibrillar elastomer surfaces, it is rather the ratio of fibril length and storage modulus which determines fibril bending and becomes the dominant tactile dimension. Visual access to the sample during tactile exploration improves the tactile perception of fibril bendability. Experiments with colored samples show a distraction by color in participants\u2019 decisions regarding tactile similarity only for yellow samples of outstanding brightness.<\/p>\n                                        <\/div>\n                                                                        \n                                                                            <span class=\"doi doi-mobile\">DOI:\n                                        <a href=\"https:\/\/dx.doi.org\/10.1002\/admi.202101380\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                            10.1002\/admi.202101380                                        <\/a><\/span>\n                                                                                                <\/div>\n                        <\/div>\n                        <div class=\"publications-item_button\">\n                            <div class=\"open_access_wrap\">\n                                <p>\n                                    <strong>Advanced Materials Interfaces                                    , <br>\n                                    <\/strong>2022,                                     9  (4), 2101380.                                 <\/p>\n                                <span class=\"open_access\">OPEN ACCESS<\/span>                            <\/div>\n                            <div class=\"button_wrap\">\n                                                                    <a target=\"_blank\"\n                                       class=\"wp-block-button__link wp-element-button\"\n                                       href=\"https:\/\/dx.doi.org\/10.1002\/admi.202101380\"\n                                       aria-label=\"Read the full publication: Bending as Key Mechanism in the Tactile Perception of Fibrillar Surfaces\">\n                                       <span class=\"screen-reader-text\">Discover more<\/span>\n                                       <span class=\"wp-element-button_arrow\"><\/span>\n                                    <\/a>\n                                                                <\/div>\n                        <\/div>\n                    <\/div>\n                <\/div>\n                                <div class=\"publications-item radius-20\">\n                    <div class=\"publications-item_content\">\n                        <div class=\"publications-image\">                                <img width=\"115\" height=\"150\" src=\"https:\/\/www.leibniz-inm.de\/wp-content\/uploads\/2024\/04\/inm-publication-11.jpg\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" \/>                            <\/div>\n                        <div class=\"publications-content\">\n                            <div class=\"publications-item_name\">The mechanics of single cross-links which mediate cell attachment at a hydrogel surface<\/div>\n                            <div class=\"publications-item_details\">\n                                <p>\u00c7olak, Arzu | Li, Bin | Blass, Johanna | Koynov, Kaloian | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-del-campo-becares-maria-aranzazu\/\">del Campo, Aranzazu<\/a> | <a href=\"https:\/\/www.leibniz-inm.de\/en\/staff\/prof-dr-bennewitz-roland\/\">Bennewitz, Roland<\/a><\/p>\n                            \n                                                                    <p class=\"doi-abstract-row\">\n                                                                                    <button class=\"abstract-toggle\" data-target=\"abstract-26824\">\n                                                Abstract                                            <\/button>\n                                                                            \n                                                                                    <span class=\"doi\">DOI:\n                                            <a href=\"https:\/\/dx.doi.org\/10.1039\/c9nr01784d\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                                10.1039\/c9nr01784d                                            <\/a><\/span>\n                                                                            \n                                    <\/p>\n                                \n                                                                            <div id=\"abstract-26824\" class=\"publication-abstract\">\n                                            <p>The response of cultured cells to the mechanical properties of hydrogel substrates depends ultimately on the response of single crosslinks to external forces exerted at cell attachment points. We prepared hydrogels by co-polymerization of poly(ethylene glycol diacrylate) (PEGDA) and carboxy poly(ethylene glycol) acrylate (ACPEG-COOH) and confirmed fibroblast spreading on the hydrogel after the ACPEG linker was functionalized with the RGD cell adhesive motif. We performed specific force spectroscopy experiments on the same ACPEG linkers in order to probe the mechanics of single cross-links which mediate the cell attachment and spreading. Measurements were performed with tips of an atomic force microscope (AFM) functionalized with streptavidin and ACPEG linkers functionalized with biotin. We compared hydrogels of varying elastic modulus between 4 and 41 kPa which exhibited significant differences in cell spreading. An effective spring constant for the displacement of single cross-links at the hydrogel surface was derived from the distributions of rupture force and molecular stiffness. A factor of ten in the elastic modulus E of the hydrogel corresponded to a factor of five in the effective spring constant k of single crosslinks, indicating a transition in scaling with the mesh size \u03be from the macroscopic E \u221d \u03be\u22123 to the molecular k \u221d \u03be\u22122. The quantification of stiffness and deformation at the molecular length scale contributes to the discussion of mechanisms in force-regulated phenomena in cell biology.<\/p>\n                                        <\/div>\n                                                                        \n                                                                            <span class=\"doi doi-mobile\">DOI:\n                                        <a href=\"https:\/\/dx.doi.org\/10.1039\/c9nr01784d\" target=\"_blank\" aria-hidden=\"true\" tabindex=\"-1\">\n                                            10.1039\/c9nr01784d                                        <\/a><\/span>\n                                                                                                <\/div>\n                        <\/div>\n                        <div class=\"publications-item_button\">\n                            <div class=\"open_access_wrap\">\n                                <p>\n                                    <strong>Nanoscale                                    , <br>\n                                    <\/strong>2019,                                     11  (24), 11596\u201311604.                                 <\/p>\n                                                            <\/div>\n                            <div class=\"button_wrap\">\n                                                                    <a target=\"_blank\"\n                                       class=\"wp-block-button__link wp-element-button\"\n                                       href=\"https:\/\/dx.doi.org\/10.1039\/c9nr01784d\"\n                                       aria-label=\"Read the full publication: The mechanics of single cross-links which mediate cell attachment at a hydrogel surface\">\n                                       <span class=\"screen-reader-text\">Discover more<\/span>\n                                       <span class=\"wp-element-button_arrow\"><\/span>\n                                    <\/a>\n                                                                <\/div>\n                        <\/div>\n                    <\/div>\n                <\/div>\n                            <div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-layout-1 wp-block-buttons-is-layout-flex\">\n                <div class=\"wp-block-button\"><a href=\"https:\/\/www.leibniz-inm.de\/en\/wp-json\/wp\/v2\/pages\/22080\/\/?show_more=true#publications_filter\" class=\"wp-block-button__link wp-element-button\">More publications<\/a><\/div>\n            <\/div>\n                        <div class=\"pagination\">\n                            <\/div>\n            \n                <\/div>\n<\/div>\n\n<script>\n    document.addEventListener('click', function(e) {\n        if (e.target.classList.contains('abstract-toggle')) {\n            const targetId = e.target.dataset.target;\n            const el = document.getElementById(targetId);\n    \n            if (!el) return;\n    \n            el.classList.toggle('open');\n            e.target.classList.toggle('active');\n        }\n    });\n<\/script>\n\n\n<div style=\"height:200px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Our research department studies the mechanical properties of materials with a focus on surfaces. We aim to understand mechanisms of adhesion, friction, and wear through innovative experiments and to contribute to the design of new materials with mechanical functions. Example projects address the contact mechanics of novel lubricants, the nanomechanics of biomaterials, and the tactile [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":44487,"parent":22043,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-22080","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Interactive Surfaces - INM<\/title>\n<meta name=\"description\" content=\"Interactive Surfaces \u2013 Eine Seite des Leibniz-Instituts f\u00fcr Neue Materialien (INM).\" \/>\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.leibniz-inm.de\/en\/research\/scientific-units\/interactive-surfaces\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Interactive Surfaces - 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