A reason for the interest in multiferroics is that magnetic and electric orders do not simply exist side by side, but exhibit \"added value\" in the form of magnetoelectric interactions and functionalities between the ordered states. Likewise, in a ferroic material, regions with different orientation of the order parameter, the domains, do not simply exist side by side, but they exhibit new phases and properties in the domain walls. Because of their discontinuous, confined, and topological nature, domain walls exhibit functional states that are not possible in the bulk. Continuing this line of thought, one should expect domain walls in multiferroics to be a particularly rich source of novel phenomena. Here one must distinguish between (i) \"domain walls in multiferroics\", where only the ferroelectric (or magnetic) order is considered so that little is learned about the multiferroic state, and (ii) \"multiferroic domain walls\" where the ferroic phase coexistence of the wall itself is of interest. The latter are rarely studied, and I will discuss some of their intriguing features in my talk.
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\r\nBio: Professor Manfred Fiebig is known for his work in light-matter interaction in systems with strong electronic correlations. (Multi-) ferroics are of particular interest to him. After obtaining his doctoral degree in physics at the University of Dortmund, he worked at the University of Tokyo, the Max Born Institut Berlin, and the University of Bonn before he was appointed as Professor of Multifunctional Ferroic Materials in the Department of Materials at ETH Zurich in 2011. In 2021 he also became a member of the National Research Council of the Swiss National Science Foundation (SNSF), and he was elected as Corresponding Member of the Academy of Sciences and Literature | Mainz. Most recent distinctions include the 2022 APS Frank Isakson Prize for Optical Effects in Solids as well as the of the Stern Gerlach Medal in 2023, the highest distinction in Experimental Physics of the German Physical Society. He is one of the founders of the ETH Spinoff Company “3Wave Instruments”.
Polymers for people and planet - from solving problems in the lab to solving problems in the world
","image_description":"","creation_date":"2026-02-12T08:50:34","last_modification_date":"2026-02-16T08:45:19","link_label":"Website","link_url":"https://www.macrocycle.tech/","canceled":"False","cancel_reason":"","place_and_room":"MXF 1","url_place_and_room":"https://plan.epfl.ch/?room==MXF%201","url_online_room":"","spoken_languages":["https://memento.epfl.ch/api/v1/spoken_languages/2/?format=json"],"speaker":"Dr. Jan-Georg Rosenboom, MIT / MacroCycle, USA ","organizer":"Prof. Gregor Jotzu, Prof. Fabien Sorin & Prof. Esther Amstad","contact":"Prof. Gregor Jotzu, Prof. Fabien Sorin & Prof. Esther Amstad","is_internal":"False","theme":"","vulgarization":{"id":1,"fr_label":"Tout public","en_label":"General public"},"registration":{"id":3,"fr_label":"Entrée libre","en_label":"Free"},"keywords":"","file":null,"icalendar_url":"https://memento.epfl.ch/event/export/119704/","category":{"id":1,"code":"CONF","fr_label":"Conférences - Séminaires","en_label":"Conferences - Seminars","activated":true},"academic_calendar_category":null,"domains":[],"mementos":["https://memento.epfl.ch/api/v1/mementos/8/?format=json","https://memento.epfl.ch/api/v1/mementos/314/?format=json"]},{"id":71122,"title":"IMX Colloquium - Instructive soft biomaterials for tissue response by design: steering events at the biointerface","slug":"imx-colloquium-instructive-soft-biomaterials-for-t","event_url":"https://memento.epfl.ch/event/imx-colloquium-instructive-soft-biomaterials-for-t","visual_url":"https://memento.epfl.ch/image/32494/200x112.jpg","visual_large_url":"https://memento.epfl.ch/image/32494/720x405.jpg","visual_maxsize_url":"https://memento.epfl.ch/image/32494/max-size.jpg","lang":"en","start_date":"2026-05-04","end_date":"2026-05-04","start_time":"13:15:00","end_time":"14:15:00","description":"","image_description":"","creation_date":"2026-02-12T08:53:46","last_modification_date":"2026-02-24T08:31:46","link_label":"Website","link_url":"https://www.empa.ch/web/s404/dr.-katharina-maniura","canceled":"False","cancel_reason":"","place_and_room":"MXF 1","url_place_and_room":"https://plan.epfl.ch/?room==MXF%201","url_online_room":"","spoken_languages":["https://memento.epfl.ch/api/v1/spoken_languages/2/?format=json"],"speaker":"Prof. Katharina Maniura, EMPA","organizer":"Prof. Gregor Jotzu, Prof. Fabien Sorin & Prof. Esther Amstad","contact":"Prof. Gregor Jotzu, Prof. Fabien Sorin & Prof. Esther Amstad","is_internal":"False","theme":"","vulgarization":{"id":1,"fr_label":"Tout public","en_label":"General public"},"registration":{"id":3,"fr_label":"Entrée libre","en_label":"Free"},"keywords":"","file":null,"icalendar_url":"https://memento.epfl.ch/event/export/119705/","category":{"id":1,"code":"CONF","fr_label":"Conférences - 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Séminaires","en_label":"Conferences - Seminars","activated":true},"academic_calendar_category":null,"domains":[],"mementos":["https://memento.epfl.ch/api/v1/mementos/8/?format=json","https://memento.epfl.ch/api/v1/mementos/314/?format=json"]},{"id":71124,"title":"IMX Colloquium - The delivery challenges of nanoparticles to solid tumours","slug":"imx-colloquium-the-delivery-challenges-of-nanopart","event_url":"https://memento.epfl.ch/event/imx-colloquium-the-delivery-challenges-of-nanopart","visual_url":"https://memento.epfl.ch/image/32496/200x112.jpg","visual_large_url":"https://memento.epfl.ch/image/32496/720x405.jpg","visual_maxsize_url":"https://memento.epfl.ch/image/32496/max-size.jpg","lang":"en","start_date":"2026-05-18","end_date":"2026-05-18","start_time":"13:15:00","end_time":"14:15:00","description":"","image_description":"","creation_date":"2026-02-12T09:00:51","last_modification_date":"2026-02-24T08:50:05","link_label":"Website","link_url":"https://dr.ntu.edu.sg/entities/person/Warren-Chan","canceled":"False","cancel_reason":"","place_and_room":"MXF 1","url_place_and_room":"https://plan.epfl.ch/?room==MXF%201","url_online_room":"","spoken_languages":["https://memento.epfl.ch/api/v1/spoken_languages/2/?format=json"],"speaker":"Prof. Warren Chan, Nanyang Technological University, Singapore","organizer":"Prof. Gregor Jotzu, Prof. Fabien Sorin & Prof. Esther Amstad","contact":"Prof. Gregor Jotzu, Prof. Fabien Sorin & Prof. Esther Amstad","is_internal":"False","theme":"","vulgarization":{"id":1,"fr_label":"Tout public","en_label":"General public"},"registration":{"id":3,"fr_label":"Entrée libre","en_label":"Free"},"keywords":"","file":null,"icalendar_url":"https://memento.epfl.ch/event/export/119709/","category":{"id":1,"code":"CONF","fr_label":"Conférences - Séminaires","en_label":"Conferences - Seminars","activated":true},"academic_calendar_category":null,"domains":[],"mementos":["https://memento.epfl.ch/api/v1/mementos/8/?format=json","https://memento.epfl.ch/api/v1/mementos/314/?format=json"]},{"id":71215,"title":"IMX Colloquium - Surface engineering for phase change heat and mass transfer: controlling nucleation and bubble dynamics","slug":"imx-colloquium-surface-engineering-for-phase-chang","event_url":"https://memento.epfl.ch/event/imx-colloquium-surface-engineering-for-phase-chang","visual_url":"https://memento.epfl.ch/image/32580/200x112.jpg","visual_large_url":"https://memento.epfl.ch/image/32580/720x405.jpg","visual_maxsize_url":"https://memento.epfl.ch/image/32580/max-size.jpg","lang":"en","start_date":"2026-04-13","end_date":"2026-04-13","start_time":"13:15:00","end_time":"14:15:00","description":"Boiling is one of the most efficient modes of heat transfer, underlying many energy-intensive processes. Advancements in surface engineering have enabled significant enhancement of boiling heat transfer. However, performance gains rarely transfer across conditions or geometries. Two challenges illustrate why: bubble nucleation behavior is poorly reproducible; and increasing nucleating density to raise the heat transfer coefficient typically lowers the system’s maximum achievable heat flux. This talk presents our efforts in addressing each challenge by identifying the governing mechanism and designing for it.
\r\nIn the first part, micro-engineered silicon surfaces isolate two governing length scales: the hydrodynamic boundary layer thickness, which controls nucleation stability through inter-site shielding, and the bubble departure diameter, which governs vapor removal after full activation. We experimentally show that nucleation stability responds to the former length scale (~0.24 mm); heat transfer in the activated regime responds to the latter length scale (~2.5 mm).
\r\nThe second study addresses the high-heat-flux limit, where large vapor structures block liquid return. Capillary wicking through copper inverse opals (~10 μm pores) supplies liquid beneath the vapor. Crucially, the pore cavities are themselves the nucleation sites, so wicking capacity and nucleation density derive from the same structure. Further, CuO nanograss on the pore walls suppresses vapor penetration into the porous layer, enabling thicker structures and greater capillary head. The result is simultaneous enhancement of heat transfer coefficients and maximum heat fluxes.
\r\nTogether, the two works show that mechanism-targeted surface design yields gains that empirical topography optimization does not. They point toward a broader design principle: that nucleation and interfacial transport, treated as controllable rather than given, offer a promising path to engineering phase change processes across applications.
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\r\nhttps://dx.doi.org/10.1021/acsami.9b20520?ref=pdf
\r\nhttps://doi.org/10.1038/s41467-019-10209-w
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\r\nBio: Zhengmao Lu is a Tenure Track Assistant Professor of Mechanical Engineering at EPFL. Prior to joining EPFL, Zhengmao was a postdoctoral scholar in the Department of Materials Science and Engineering at MIT with Prof. Jeffrey Grossman. He received his Ph.D. and M.S. in Mechanical Engineering from MIT, both advised by Prof. Evelyn Wang. At EPFL, Zhengmao leads the Energy Transport Advances Laboratory (η-Lab), aiming to deepen our understanding of phase change phenomena and develop more sustainable energy and water technologies by optimizing interfacial transport. Zhengmao is a recipient of the ERC Starting Grant, MicroFIPS Outstanding Early Career Award, Keck Travel Award in Thermal Sciences, and the Outstanding Graduate Research Award from MIT Mechanical Engineering.
Abstract
\r\nAround 30% of cancers are preceded by chronic inflammation which occurs at the site where tumors will develop. However, whether this oncogenic process, particularly observed in the intestine, can be initiated by a specific immune cell population remains unknown. We recently identified two distinct effector T cell populations capable to initiate the oncogenic transformation of a healthy intestinal epithelium (Fesneau et al., Nat Immunol. 2024; Brewer et al., Nat. Rev. Canc. 2024), as well as the factors controlling their differentiation. By revealing the presence of tumorigenic T cells, this work opens a new field in oncology and immunology that will be key for both our understanding of the early steps of carcinogenesis and the development of prophylactic therapies against cancer.
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