{"id":1071,"date":"2022-02-03T11:04:13","date_gmt":"2022-02-03T10:04:13","guid":{"rendered":"https:\/\/mami.u-strasbg.fr\/?page_id=1071"},"modified":"2022-02-08T11:24:32","modified_gmt":"2022-02-08T10:24:32","slug":"pietro-tierno","status":"publish","type":"page","link":"https:\/\/mami.u-strasbg.fr\/index.php\/pietro-tierno\/","title":{"rendered":"Pietro Tierno"},"content":{"rendered":"\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t
\"\"<\/a><\/figure>

Pietro Tierno<\/a><\/h3>

Associate professor
\nDepartment of Condensed Matter Physics
\nUniversity of Barcelona<\/p><\/div><\/div>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

\n\t\t\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t

Title: Emergent colloidal currents generated via exchange dynamics in a broken dimer state<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t
\n\t\t\t\t
Authors:
<\/b><\/div>
Antonio Ortiz-Ambriz 1;2<\/sup>, Helena Massana-Cid1;3<\/sup>, Mattia Ostinato 1;2<\/sup>, P. Tierno 1;2;3<\/sup>
1<\/sup> Departament de F\u00edsica de la Mat\u00e8ria Condensada, Universitat de Barcelona, 08028 Barcelona, Spain:\u00a0Email: ptierno@ub.edu<\/a>
2<\/sup> Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, 08028\u00a0Barcelona, Spain\u00a03 Institut de Nanoci\u00e8ncia i Nanotecnologia, Universitat de Barcelona, 08028 Barcelona, Spain<\/div><\/div>
Abstract:\u00a0<\/b>In this talk, I will describe a general strategy to assemble and transport polarizable magnetic microspheres in fluid media through a combination of confinement [1] and magnetic dipolar interactions [2]. We use a homogeneous magnetic modulation to assemble dispersed particles into rotating dimeric state and frustrated binary lattices and generate collective edge currents that arise from a novel, field-synchronized particle exchange process [3]. The observed, net bidirectional current is composed of colloidal particles which periodically meet assembling into rotating dimers, and exchange their\u00a0positions in a characteristic, “ceilidh”-like dance. We develop a theoretical model that explains the physics of the observed phenomena as dimer rupture and the onset of current, showing agreement with Brownian dynamic simulations [4]. Further, we explore recently the transport of defects as non-magnetic inclusions in ferrofluids media and\u00a0the anomalous dynamics of the broken\/recombining dimers during the exchange process.<\/div><\/div>
Overall, we demonstrate an effective technique to drive microscale matter by\u00a0using the interplay of steric confinement and dipolar forces, not based on any gradient\u00a0of the applied field.<br><\/div>
\u00a0<\/div>
References
<\/b>[1] N. Osterman, I. Poberaj, J. Dobnikar, D. Frenkel, P. Ziherl, and D. Babic Field-Induced Self-Assembly
of Suspended Colloidal Membranes, Phys. Rev. Lett. 103:228301 (2009).
[2] P. Tierno, R: Muruganathan and T. M. Fischer, Viscoelasticity of Dynamically Self-Assembled Paramagnetic
Colloidal Clusters, Phys. Rev. Lett. 98:028301 (2007).
[3] H. Massana-Cid, A. Ortiz-Ambriz, A. Vilfan and P. Tierno, Emergent collective colloidal currents
generated via exchange dynamics in a broken dimer state, Science advances 6:eaaz2257 (2020).
[4] F. Meng, A. Ortiz-Ambriz, H. Massana-Cid, A. Vilfan, R. Golestanian and P. Tierno, Field synchronized
bidirectional current in confined driven colloids, Physical Review Research 2: 012025 (2020).<\/div>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Pietro Tierno Associate professor Department of Condensed Matter Physics University of Barcelona Title: Emergent colloidal currents generated via exchange dynamics in a broken dimer state Authors: Antonio Ortiz-Ambriz 1;2, Helena Massana-Cid1;3, Mattia Ostinato 1;2, P. Tierno 1;2;3 1 Departament de F\u00edsica de la Mat\u00e8ria Condensada, Universitat de Barcelona, 08028 Barcelona, Spain: Email: ptierno@ub.edu 2 Universitat de […]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/pages\/1071"}],"collection":[{"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/comments?post=1071"}],"version-history":[{"count":6,"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/pages\/1071\/revisions"}],"predecessor-version":[{"id":1127,"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/pages\/1071\/revisions\/1127"}],"wp:attachment":[{"href":"https:\/\/mami.u-strasbg.fr\/index.php\/wp-json\/wp\/v2\/media?parent=1071"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}