BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:Exploring interfacial physics to inspire disrupting technologies DTSTART:20200504T121500 DTEND:20200504T130000 DTSTAMP:20260407T020914Z UID:c187bbe3932beb3566ec2481405d18382c23ea067a3d6cdace98accc CATEGORIES:Conferences - Seminars DESCRIPTION:Prof. Dr. Dimos Poulikakos\,\nETH Zürich\nInstitute of Microe ngineering - Distinguished Lecture\n\nCampus Lausanne BM 5202 (live)\nCamp us Microcity MC B0 302 (video)\nZoom Live Stream: https://epfl.zoom.us/j/4 40644837\n\nAbstract: Interfaces separating different kinds of matter\, or different phases of the same matter\, abandon in nature and technology. W hat is more\, they invariably play a critical role in all systems where th ey occur\, from regulating transport of energy and species\, to dictating system shape and form. Interfaces differ in their structure and properties from the bulk matter they surround. I note here the famous quote of Wolfg ang Pauli that “God made bulk (materials) but surfaces are the work of t he devil”. Interfaces are of course of critical importance in small scal e systems and even more so as we move toward nanoscales\, where their prop ortion in a given system increases dramatically and their effect dominates system behaviour.\n\nIn this lecture I will primarily focus on liquid/gas and liquid/solid interfaces as they manifest themselves in simple systems \, such as small droplets and nanoparticles\, in particular when they are at a metastable thermodynamic state or under the regulated influence of an external field (gravitational\, acoustic\, electric or electromagnetic)\, showing in parallel novel applications deriving from understanding their physics.  \n\nFirst\, I will address the spontaneous removal of discrete condensed matter from surfaces\, of importance in nature and in a broad ra nge of technologies\, e.g. self-cleaning\, anti-icing\, and condensation . The understanding of phenomena leading to such behavior\, combined with rational micro/nano surface texture design promoting their manifestation\ , remain a challenge. I will show how water droplets resting on superhyd rophobic surfaces in a low-pressure environment can self-remove through su dden spontaneous levitation and subsequent trampoline-like bouncing beha vior\, i.e. sequential droplet-substrate collisions with restitution coeff icients greater than unity\, despite complete surface rigidity\, seemingl y violating the second law of thermodynamics. Due to the high-vaporization rates experienced by droplets\, and the inherently associated significant cooling\, freezing from a metastable state can occur. I will show how in creasing vaporization —triggered suddenly by metastable state freezing — has a strong boosting effect and can spontaneously remove surface icin g (by levitating or even launching away generated icy drops/particles) the moment they freeze. This work exemplifies how surface texturing aware of such interfacial phenomena alone\, can prohibit water droplet retention on surfaces\, also when they freeze.\n\nNext\, a remarkably simple process f or the maskless direct printing of nanoparticles of all kinds\, through el ectrohydrodynamic “NanoDrip” printing of colloidal nanodroplets will b e presented and the related interfacial physics and transport phenomena le ading to the tunable formation of in- and out-of-plane functional nanostru ctures as single entities or large arrays will be explained.  A host of a pplications enabled by NanoDrip printing will be discussed\, ranging from plasmonics\, driven by single photon emitters (quantum dots\, or even prec isely printed single organic molecules) to the printing of transparent con ductive grids and to tracking force microscopy (TFM) methods for cells wit h unprecedented facility and resolution.\n\nFinally\, I will discuss the c ontrollable manipulation of biological and synthetic nanoscopic species in liquids at the ultimate single object resolution (biological quantum leve l)\, important to many fields such as biology\, medicine\, physics\, chemi stry and nanoengineering. I will present the concept of electrokinetic nan ovalving\, with which we confine and guide single biological nano-objects in a liquid\, solely based on spatiotemporal tailoring of the free energy landscape guiding the motion. The electric field generating this energy la ndscape is readily modulated collaboratively by wall nanotopography and by addressable embedded nanoelectrodes in a nanochannel. I will demonstrate guiding\, confining\, releasing and sorting of biological nano-objects\, r anging from macromolecules to adenoviruses\, but also a broad palette of o ther nano-objects such as lipid vesicles\, dielectric and metallic particl es\, of various sizes and inherent charges\, suspended in electrolytes wit h to biological buffer solution levels. Such systems can enable individual handling of multiple entities as well as simultaneously obtaining accurat e information of the properties of their such as electrical conductivity a nd permittivity\, in applications ranging from chemical or biochemical syn thesis to precise drug delivery\, in a continuous lab-on-chip environment with biological quantum level resolution.\n\n\nBio: Professor Dimos Pouli kakos holds the Chair of Thermodynamics at ETH Zurich\, where in 1996 he f ounded the Laboratory of Thermodynamics in Emerging Technologies in the In stitute of Energy Technology. He served as the Vice President of Research of ETH Zurich in the period 2005-2007. Professor Poulikakos was the ETH di rector of the IBM-ETH Binnig-Rohrer Nanotechnology center\, a unique priva te-public partnership in nanotechnology at the interface of basic research and future oriented applications (2008-2011). He served as the Head of th e Mechanical and Process Engineering Department at ETH Zurich (2011-2014). He is currently the Chairperson of the Energy Science Center of ETH Zuric h and a member of CORE\, the advisory board of the Swiss government on iss ues related to energy. As of January 2020\, he is also the president of Di vision IV the of the Swiss National Science Foundation (SNF) and member of the presiding board of SNF.\n\nHis research is in the area of interfacial transport phenomena\, thermodynamics and related materials nanoengineerin g\, with a host of related applications. The focus is on understanding the related physics\, in particular at the micro- and nanoscales and employin g this knowledge to the development of novel technologies. Specific curren t examples of application areas are the direct 2D and 3D printing of compl ex liquids and colloids with nanoscale feature size and resolution\, the s cience-based design of supericephobic and omniphobic surfaces\, the chip/t ransistor-level\, bio-inspired 3D integrated cooling of supercomputer elec tronics\, the development of facile methods based on plasmonics for sunlig ht management and the development of nanofluidic technologies and surface textures for biological applications under realistic fluidic environments (accelerated and guided cell adhesion\, re-endothelialization\, antifibrot ic surface textures and materials\, single virus trapping and transport).\ n\nAmong the awards and recognitions he has received for his contributions are the White House/NSF Presidential Young Investigator Award in 1985\, t he Pi Tau Sigma Gold Medal in 1986\, the Society of Automotive Engineers R alph R. Teetor Award in 1986\, the University of Illinois Scholar Award in 1986 and the Reviewer of the Year Award for the ASME Journal of Heat Tran sfer in 1995. He is the recipient of the 2000 James Harry Potter Gold Meda l of the American Society of Mechanical Engineers. He was a Russell S. Spr inger Professor of the Mechanical Engineering Department of the University of California at Berkeley (2003) and the Hawkins Memorial Lecturer of Pur due University in 2004. He received the Heat Transfer Memorial Award for S cience in 2003 from ASME. In 2008 he was a visiting Fellow at Oxford Unive rsity and a distinguished visitor at the University of Tokyo.  He is the recipient of the 2009 Nusselt-Reynolds Prize of the World Assembly of Heat Transfer and Thermodynamics conferences (awarded every four years)\, for his scientific contributions. He is the 2012 recipient of the Max Jacob Aw ard\, for eminent scholarly achievement and distinguished leadership in th e field of fluidics and heat transfer. Awarded annually to a scholar joint ly by (ASME) and (AIChE)\, the Max Jacob Award is the highest honor in the field of thermofluidics these professional organizations bestow. He was p resented with the Outstanding Engineering Alumnus Award of the University of Colorado in Boulder in 2012. He received the Dr.h.c. of the National Te chnical University of Athens in 2006. In 2008 he was elected to the Swiss National Academy of Engineering (SATW)\, where from 2012 to 2015 he also s erved as president of its science board.\n\n\nNote: The Seminar Series is eligible for ECTS credits in the EDMI doctoral program\n\nNote: After the lecture\, there will be time for discussion and interaction with the disti nguished speaker\, sandwich lunch and refreshments sponsored by the Instit ute of Microengineering will be provided for attendees in front of the lec ture hall (BM 5104\, ca. 13h15) LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 STATUS:CANCELLED END:VEVENT END:VCALENDAR