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Prof.dr. Laurens Siebbeles

Laurens Siebbeles (1963) is head of the section Optoelectronic Materials in the Chemical Engineering Department at TU Delft, (3 PI's, 5 technicians, ~20 PhD students/postdocs). The section has a worldwide unique infrastructure with production of excitons/charges by laser or high-energy electron pulses, and detection by time-resolved optical, microwave or THz conductivity techniques. He pairs experimental research with theory of charge/exciton dynamics in materials with potential (opto)electronic applications. Experimental and theoretical studies are carried out in collaboration with numerous academic groups worldwide and with industry, most notably Toyota Motor Europe in Brussels, Belgium. He publishes the results in international peer reviewed journals and via (invited) oral presentations at (international) conferences, universities or research institutes. Some results have been highlighted in other scientific journals, (inter)national newspapers and other popular media/websites. The research of Siebbeles has been funded by the Netherlands Organisation for Scientific Research (NWO, FOM, STW), the European Union, the Deutsche Forschungs Gemeinschaft and Toyota Motor Europe. In 2004 he received a VICI grant from NWO; a prestigious grant of 1250 k€ for PI's who have demonstrated their ability to develop a new line of research and act as mentor for young researchers. The grant was complemented by 500 k€ from TU Delft and used to develop a femtosecond laser facility and picosecond pulsed high-energy electron accelerator. In 2016 he was awarded an NWO-TOP grant of 800 k€, offering outstanding researchers the possibility to renew their research. He uses this grant to study excitons and charge carriers at high density, including the formation of electron-hole Cooper pairs (in collaboration with Vanmaekelbergh and Stoof from Utrecht). On a regular basis Siebbeles is (co-)organizer of (inter)national conferences, serves on (inter)national recruitment committees, boards for awarding research grants, etc. He has been teaching several courses for bachelor and master students at TU Delft, including classical mechanics, quantum mechanics/chemistry, spectroscopy and condensed matter physics. Since 2016 he is director of the Graduate School (for PhD students) of the Faculty of Applied Sciences at TU Delft. Curriculum Vitae Scientific education 1991 PhD degree, University of Amsterdam Thesis studies carried out in FOM Institute for Atomic and Molecular Physics (AMOLF) in Amsterdam. Thesis title: Anisotropy in the photodissociation of H2. Thesis advisor: Prof. Dr. J. Los 1986 MSc degree Chemistry, Free University Amsterdam Topics: Photolectron spectroscopy experiments on ionization of small molecules and quantum chemical electronic structure calculations. Past and present positions 2005-present Professor and head of section Optoelectronic Materials in Dept. of Chemical Engineering (TU Delft). Topics: Experiments and theory on excitons and charges in (in)organic nanomaterials, such as quantum dots, nanowires and two-dimensional materials. 2016-present Director of the Graduate School (for PhD students) of the Faculty of Applied Sciences at TU Delft. 2011-2016 Deputy Head of the Department of Chemical Engineering (TU Delft). 2001-2005 Professor and head of section Radiation Chemistry in Reactor Institute of TU Delft. Topics: Experiments and theory on excitons and charges in organic materials and interaction of high-energy radiation (electrons, positrons, muons) with matter. 2000-2001 Associate professor of Radiation Chemistry in the Reactor Institute of TU Delft. 1994-2000 Assistant professor of Radiation Chemistry in the Reactor Institute of TU Delft. Topics: Experiments and theory on excitons and charges in organic materials and interaction of high-energy radiation (electrons, positrons, muons) with matter. 1994-1994 Postdoc in FOM Institute for Atomic and Molecular Physics (AMOLF, Amsterdam) in group of Prof. Dr. W.J. van der Zande. Topic: Quantum theory on photodissociation of molecules. 1991-1994 Postdoc in Laboratoire pour l’Utilisation du Rayonnement Electromagnétique, Université de Paris Sud (Orsay, France) in group of Prof. dr. J.A. Beswick. Topics: Experiments and quantum theory on photodissociation of molecules. Awards TOP grant (2016) form the Netherlands Organisation for Scientific Research (NWO) of 800 kEuro, offering outstanding researchers the possibility to renew their research. VICI grant (2004) in the Innovational Incentives Scheme of The Netherlands Organisation for Scientific Research (NWO); prestigious grant of 1250 kEuro for senior researchers that have demonstrated their ability to develop a new line of research and act as a mentor for young researchers. Young Chemist grant (2002, NWO); grant of 230 kEuro for excellent young chemists to initiate a new research line. Antoni van Leeuwenhoek professorship (2001); honorary early promotion to full professor awarded by TU Delft to excellent, promising young scientists. Prof.dr. Laurens D.A. Siebbeles +31 (0)15 27 81800 l.d.a.siebbeles@tudelft.nl Building 58 Van der Maasweg 9 NL-2629 HZ Delft

Service to society and public outreach

Advisory roles The members of the Ethics/Philosophy Section are involved as advisors and/or members in several policy committees at national, EU, and UN levels, such as: COGEM (‘commissie genetische modificatie’, subcommittee ethical and social aspects), a committee that advises the Dutch government about genetic modification (Sabine Roeser, 2009-2017) The FutureSocietyNL , a newly established think tank, bringing together Dutch leaders in technology development and critical reflection on these developments (Sabine Roeser, 2018-present) The working group ‘ethics and digitization’ of ECP, ‘Platform voor de informatiesamenleving’, a Dutch platform bringing together private and public stakeholders concerning the ‘information society’ (Sabine Roeser, 2018-present) The advisory board of the COVRA/OPERA (Dutch research institute for nuclear waste disposal) (Sabine Roeser, 2011-2018) The advisory group on new risks for the Dutch ministry of infrastructure and environment (IenM) (Sabine Roeser, 2011-2012) The IST Advisory Group to EU Commissioner Reding for ICT and New Media (Jeroen van den Hoven) Advisor to the Dutch Government in various roles (Jeroen van den Hoven) The Research network of the Home Office on E-Government (Jeroen van den Hoven) The European Group on Ethics (EGE) to the European Commission (Jeroen van den Hoven, permanent member) The Dutch Research Council on Responsible Innovation (Jeroen van den Hoven) The Institute for Accountability in a Digital Age (Aimee van Wynsberghe) The European Commission's High-Level Expert Group on AI (Aimee van Wynsberghe) The Netherlands AI Alliance (Aimee van Wynsberghe) The Young Academy of the Royal Netherlands Academy of Arts and Sciences (Behnam Taebi, 2016-2021) Our members are also active in the media, attempting to raise public awareness about the ethical and philosophical implications of technology. Some of their public appearances and conferences are available online. You can see a selection of these videos down below. Sabine Roeser - Emotions should play an important role in debates on risky technology - TEDxDelft Jeroen van den Hoven - Responsible Innnovation and the Built Environment Behnam Taebi - Justice And Climate Change

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Students Amos Yusuf, Mick Dam & Bas Brouwer winners of Mekel Prize 2024

Master students Amos Yusuf, from the ME faculty (Mick Dam, from the EEMCS faculty and graduate Bas Brouwer have won the Mekel Prize 2024 for the best extra scientific activity at TU Delft: the development of an initiative that brings master students into the classroom teaching sciences to the younger generations. The prize was ceremonially awarded by prof Tim van den Hagen on 13 November after the Van Hasselt Lecture at the Prinsenhof, Delft. They received a statue of Professor Jan Mekel and 1.500,- to spend on their project. Insights into climate change are being openly doubted. Funding for important educational efforts and research are being withdrawn. Short clips – so called “reels” – on Youtube and TikTok threaten to simplify complex political and social problems. AI fakes befuddle what is true and what is not. The voices of science that contribute to those discussion with modesty, careful argument and scepticism, are drowned in noise. This poses a threat for universities like TU Delft, who strive to increase student numbers, who benefit from diverse student populations and aim to pass on their knowledge and scientific virtues to the next generation. It is, therefore, alarming that student enrolments to Bachelor and Master Programs at TU Delft have declined in the past year. Students in front of the class The project is aimed to make the sciences more appealing to the next generation. They have identified the problem that students tend miss out on the opportunity of entering a higher education trajectory in the Beta sciences – because they have a wrong picture of such education. In their mind, they depict it as boring and dry. In his pilot lecture at the Stanislas VMBO in Delft, Amos Yusuf has successfully challenged this image. He shared his enthusiasm for the field of robotics and presented himself as a positive role model to the pupils. And in return the excitement of the high school students is palpable in the videos and pictures from the day. The spark of science fills their eyes. Bas Brouwer Mick Dam are the founders of NUVO – the platform that facilitates the engagement of Master Students in high school education in Delft Their efforts offer TU Delft Master Students a valuable learning moment: By sharing insights from their fields with pupils at high school in an educational setting, our students can find identify their own misunderstandings of their subject, learn to speak in front of non-scientific audiences and peak into education as a work field they themselves might not have considered. An extraordinary commitment According to the Mekel jury, the project scored well on all the criteria (risk mitigation, inclusiveness, transparency and societal relevance). However, it was the extraordinary commitment of Amos who was fully immersed during his Master Project and the efforts of Brouwer and Dam that brought together teaching and research which is integral to academic culture that made the project stand out. About the Mekel Prize The Mekel Prize will be awarded to the most socially responsible research project or extra-scientific activity (e.g. founding of an NGO or organization, an initiative or realization of an event or other impactful project) by an employee or group of employees of TU Delft – projects that showcase in an outstanding fashion that they have been committed from the beginning to relevant moral and societal values and have been aware of and tried to mitigate as much as possible in innovative ways the risks involved in their research. The award recognizes such efforts and wants to encourage the responsible development of science and technology at TU Delft in the future. For furthermore information About the project: https://www.de-nuvo.nl/video-robotica-pilot/ About the Mekel Prize: https://www.tudelft.nl/en/tpm/our-faculty/departments/values-technology-and-innovation/sections/ethics-philosophy-of-technology/mekel-prize

New catheter technology promises safer and more efficient treatment of blood vessels

Each year, more than 200 million catheters are used worldwide to treat vascular diseases, including heart disease and artery stenosis. When navigating into blood vessels, friction between the catheter and the vessel wall can cause major complications. With a new innovative catheter technology, Mostafa Atalla and colleagues can change the friction from having grip to completely slippery with the flick of a switch. Their design improves the safety and efficiency of endovascular procedures. The findings have been published in IEEE. Catheter with variable friction The prototype of the new catheter features advanced friction control modules to precisely control the friction between the catheter and the vessel wall. The friction is modulated via ultrasonic vibrations, which overpressure the thin fluid layer. This innovative variable friction technology makes it possible to switch between low friction for smooth navigation through the vessel and high friction for optimal stability during the procedure. In a proof-of-concept, Atalla and his team show that the prototype significantly reduces friction, averaging 60% on rigid surfaces and 11% on soft surfaces. Experiments on animal aortic tissue confirm the promising results of this technology and its potential for medical applications. Fully assembled catheters The researchers tested the prototype during friction experiments on different tissue types. They are also investigating how the technology can be applied to other procedures, such as bowel interventions. More information Publicatie DOI : 10.1109/TMRB.2024.3464672 Toward Variable-Friction Catheters Using Ultrasonic Lubrication | IEEE Journals & Magazine | IEEE Xplore Mostafa Atalla: m.a.a.atalla@tudelft.nl Aimee Sakes: a.sakes@tudelft.nl Michaël Wiertlewski: m.wiertlewski@tudelft.nl Would you like to know more and/or attend a demonstration of the prototype please contact me: Fien Bosman, press officer Health TU Delft: f.j.bosman@tudelft.nl/ 0624953733

A key solution to grid congestion

On behalf of the TU Delft PowerWeb Institute, researchers Kenneth Brunninx and Simon Tindemans are handing over a Position Paper to the Dutch Parliament on 14 November 2024, with a possible solution to the major grid capacity problems that are increasingly cropping up in the Netherlands. The Netherlands is unlikely to meet the 2030 climate targets, and one of the reasons for this is that large industry cannot switch to electricity fast enough, partly because of increasingly frequent problems around grid capacity and grid congestion. In all likelihood, those problems will actually increase this decade before they can decrease, the researchers argue. The solution offered by the TU Delft PowerWeb Institute researchers is the ‘flexible backstop’. With a flexible backstop, the current capacity of the power grid can be used more efficiently without sacrificing safety or reliability. A flexible backstop is a safety mechanism that automatically and quickly reduces the amount of electricity that an electric unit can draw from the grid (an electric charging station or a heat pump) or deliver (a PV installation). It is a small device connected or built into an electrical unit, such as a charging station or heat pump, that ‘communicates’ with the distribution network operator. In case of extreme stress on the network, the network operator sends a signal to the device to limit the amount of power. Germany recently introduced a similar system with electric charging stations. The backstop would be activated only in periods of acute congestion problems and could help prevent the last resort measure, which is cutting off electricity to users. ‘Upgrading the electricity network remains essential, but in practice it will take years. So there is a need for short-term solutions that can be integrated into long-term planning. We, the members of the TU Delft PowerWeb Institute, call on the government, network operators and regulator to explore the flexible backstop as an additional grid security measure,’ they said. The entire Paper can be read here . Kenneth Brunninx Associate Professor at the Faculty of Engineering, Governance and Management, where he uses quantitative models to evaluate energy policy and market design with the aim of reducing CO2 emissions. Simon Tindemans is Associate Professor in the Intelligent Electrical Power Grids group at Faculty of Electrical Engineering, Mathematics and Computer Science. His research interests include uncertainty and risk management for power grids. TU Delft PowerWeb Institute is a community of researchers who are investigating how to make renewable energy systems reliable, future proof and accessible to everyone.

25 year celebration of formal collaboration between Delft University of Technology and the University of Campinas

On 25 October 2024 we celebrated 25 years of formal collaboration between Delft University of Technology and the University of Campinas. What began as a project to exchange some students in chemical engineering has now grown to a multifaceted and broad academic collaboration which accumulated into 24 joint research projects (>20 M Euro); 16 advanced courses and 15 Doctors with a Dual Degree PhD. Patricia Osseweijer, TU Delft Ambassador Brazil explained, “We are proud to show and reflect on this special day the added value we created resulting from our joint activities. The lessons we learned demonstrate that especially continuity of funds and availability for exchanges has contributed to joint motivation and building trust which created strong relations. This is the foundation for academic creativity and high-level achievements.” The program presented showcases of Dual Degree projects; research activities and education. It discussed the future objectives and new fields of attention and agree on the next steps to maintain and strengthen the foundation of strong relations. Telma Franco, Professor UNICAMP shared that “joint education and research has substantially benefitted the students, we see that back in the jobs they landed in,” while UNICAMP’s Professor Gustavo Paim Valenca confirmed that “we are keen to extend our collaboration to more engineering disciplines to contribute jointly to global challenges” Luuk van der Wielen highlighted that “UNICAMP and TU Delft provide valuable complementary expertise as well as infrastructures to accelerate research and innovation. Especially our joint efforts in public private partnerships brings great assets” To ensure our future activities both University Boards have launched a unique joint program for international academic leadership. This unique 7-month program will accommodate 12 young professors, 6 from each university. The programme began on 4 November 2024 in Delft, The Netherlands.

Christmas lunch

Take part in a festive lunch with MoTiv, TU Delft Studentenraad en TU Delft ESA This holiday season, MoTiv, TU Delft, and the local Delft churches are bringing together homes and students for a special, heartwarming experience, and we would love for you to be part of it! After three successful years, we’re excited to continue this festive tradition, bridging cultures and creating connections. Are you interested in joining a holiday lunch as a guest , along with other international students, in a welcoming Delft-area home? Or perhaps you’d like to open your home as a host , sharing a warm, cultural celebration with students from around the world? This special event will take place from December 23rd to December 31st, between 12:00 and 15:00 . For Guests : If you’d like to participate as a guest, we’ll match you with a local host eager to share their holiday traditions. You’ll enjoy delicious dishes, laughter, and meaningful conversations, creating memories that feel like home, even far from family. Once matched, we’ll connect you with your host so you can coordinate details and meal plans together. Sign up as a guest in this google forms.(https://forms.gle/yLAqE83DcqWGwcKB8) For Hosts : If you’re interested in hosting, this is a wonderful opportunity to welcome students into your home for a memorable meal. By sharing food, stories, and perhaps even a few games, you’ll help make the season brighter for students eager to experience Dutch hospitality and holiday traditions. Sign up as a host in this google forms.( https://forms.gle/bJB5svxJZ1iTSF1c6 ) For any questions, feel free to reach out to us at motiv.connects@gmail.com. For more information, please visit our website at www.motiv.tudelft.nl/christmas-lunch-delft/ . Thank you for making this holiday season unforgettable. We look forward to celebrating with you! Warm regards, MoTiv, TU Delft Student Council, TU Delft ESA - Student Community Team