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SUMMARY:EPFL BioE Talks SERIES  "Nanofluidics Beyond Single Nanopores and 
 Aqueous Media"
DTSTART:20230227T160000
DTEND:20230227T170000
DTSTAMP:20260916T165504Z
UID:39303176c74982790aca0344812e3f8b0f129c8b6dd43a97a7c2dea4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Zuzanna S. Siwy\, University of California\, Irvine\, CA
  (USA)\nWEEKLY EPFL BIOE TALKS SERIES\n\nAbstract:\nSingle nanopore resear
 ch has revolutionized many areas\, from DNA/protein sequencing to molecula
 r separations. Inspired by Nature\, we propose to move beyond the confines
  of single nanopores and create programmable arrays of interacting nanopor
 es. If we could create an array of nanopores embedded in the same membrane
  where transport through individual nanopores depends on the presence and 
 properties of neighboring nanopores\, we could create highly intricate ion
 ic systems with tunable and responsive transport properties. I will descri
 be our first results on ionic transport through nanopore arrays consisting
  of three up to nine nanopores located at tunable positions and interpore 
 distances. The nanopores interact with each other via overlapping depletio
 n zones at pore entrances created by concentration polarization. The inter
 actions can be further tuned by salt concentration and modifying the chemi
 stry of the pore walls such that each pore functions as a diode. Interacti
 ons of such nonlinear ionic devices leads to unusual additivity of conduct
 ances of individual pores. Finally\, I will discuss possibilities to induc
 e different transport properties in pores in the same array by placement o
 f gate electrode.\nThe majority of nanopore experiments and modeling has c
 onsidered aqueous environment. In the second part of the talk\, I will dis
 cuss new transport properties of nanopores that originate from a choice of
  solvent. By replacing water with aprotic\, high dipole-moment organic sol
 vents\, we have achieved unusual interfaces where the distributions of pot
 ential and ions are dictated by the long-range bilayer structure of the so
 lvent. Using acetonitrile as an example solvent and silica an example surf
 ace\, we show that the solid/liquid interface exhibits effective surface p
 otential whose sign switches from negative in low salt concentrations to p
 ositive at higher salt concentrations. The threshold concentration at whic
 h the surface potential changes sign is dependent on the chemical identity
  of the salt as well as sizes of the constituent ions. Acetonitrile and ot
 her high dipole moment aprotic solvents can therefore create interfaces wh
 ose molecular structure influence macroscopic observables such as ion curr
 ent.\n\nBio:\nDr. Zuzanna S. Siwy received her Ph.D. in 1997 from the Sile
 sian University of Technology\, Gliwice\, Poland\, and habilitation in 200
 4. She was a Fellow of the Foundation for Polish Science\, and the Alexand
 er von Humboldt Foundation at the Institute for Heavy Ions Research (GSI) 
 in Darmstadt\, Germany. In 2005\, Dr. Siwy joined the Department of Physic
 s and Astronomy at the University of California\, Irvine. In 2007\, she be
 came the Fellow of the Alfred von Sloan Foundation. In 2009\, Dr. Siwy was
  awarded the Presidential Early Career Award for Scientists and Engineers 
 as well as the Bessel Award from the Alexander von Humboldt Foundation. Sh
 e is a Fellow of the American Physical Society\, and AAAS. Her current res
 earch interests focus on using synthetic nanopores as templates for biomim
 etic channels\, preparation of ionic diodes and ionic transistors as well 
 as model systems to discover new physics under nanoconfinement.\n\n\nZoom 
 link (with one-time registration for the whole series) for attending remot
 ely: https://go.epfl.ch/EPFLBioETalks\n 
LOCATION:SV 1717 https://plan.epfl.ch/?room==SV%201717 https://go.epfl.ch/
 EPFLBioETalks
STATUS:CONFIRMED
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