{"id":11776,"date":"2025-11-05T11:18:56","date_gmt":"2025-11-05T10:18:56","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&p=11776"},"modified":"2025-11-13T11:22:41","modified_gmt":"2025-11-13T10:22:41","slug":"evolution-of-chemical-and-physical-transformations-under-electron-beams-light-and-mechanical-impact-dominik-lungerich-cemes-seminar-21-11-2025-11-h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/evolution-of-chemical-and-physical-transformations-under-electron-beams-light-and-mechanical-impact-dominik-lungerich-cemes-seminar-21-11-2025-11-h\/","title":{"rendered":"Evolution of chemical and physical transformations under electron beams, light, and mechanical impact. – (Dominik Lungerich \/ CEMES \/ Seminar). – 21\/11\/2025, 11 H"},"content":{"rendered":"

S\u00e9minaire du CEMES<\/span><\/p>\n

Dominik Lungerich, <\/strong><\/span>CEMES <\/span><\/p>\n

Seminar CEMES, 21\/11\/2025, 11H<\/span><\/p>\n

Summary<\/strong>
\nThe advent of aberration-corrected transmission electron microscopy (AC-TEM) has revolutionized materials science and adjacent disciplines, enabling researchers to capture atomic-level details with unprecedented precision. Among these developments, single-molecule atomic-resolution time-resolved electron microscopy (SMART-EM) has emerged as a powerful approach to visualize dynamic events at the molecular and atomic scale in real time.<\/p>\n

My research integrates these microscopic insights with chemical understanding\u2014through the lens of an organic chemist\u2014to elucidate reaction mechanisms driven by electron beams.[1\u20135]<\/strong> Using high-resolution imaging, complemented by image simulations and density functional theory calculations, we demonstrate the controlled formation of carbon nanostructures at the molecular level. These results establish electron-beam chemistry as a distinct and complementary approach to conventional thermal, photochemical, and mechanochemical methods.<\/p>\n

Using light as an energy source, I investigate molecular photoswitches as building blocks for responsive and mechanically active materials.[6]<\/strong> Among them, azobenzenes\u2014undergoing a pronounced geometrical change from ~1 nm (trans) to ~0.5 nm (cis)\u2014represent some of the most promising actuators. Inspired by biological muscle systems, we tailor their response through dopants and environmental modulation, creating complex multiresponsive materials that can be triggered by stimuli beyond light alone.<\/p>\n

Finally, mechanochemically assisted synthesis continues to gain importance in both academia and industry but remains limited by an incomplete understanding of reaction kinetics. In particular, dependencies on the type and dynamics of milling equipment are poorly understood and often overlooked. To address this, I identify critical kinetic parameters using kinematic models, enabling reproducibility and cross-comparison of mechanochemical reactions across commonly used planetary and mixer mills.[7]<\/strong><\/p>\n

Together, these studies illustrate how directed energy inputs\u2014electronic, photonic, and mechanical\u2014can drive and control chemical transformations with spatial and temporal precision, expanding the boundaries of molecular design and materials engineering.<\/p>\n

References<\/strong>:<\/p>\n