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SUMMARY:Angstrom-scale capillaries: Ion selectivity beyond steric effects 
 - Professor Radha Boya\, University of Manchester
DTSTART:20220427T133000Z
DTEND:20220427T143000Z
UID:TALK169940@talks.cam.ac.uk
CONTACT:Lisa Masters
DESCRIPTION:Understanding ion transport in nano/angstrom scale channels ha
 s practical relevance in applications such as membrane desalination\, blue
  energy\, supercapacitors and batteries\, as well as in understanding ioni
 c flow through biological channels. Synthetic Å-channels are now a realit
 y with the emergence of several cutting-edge bottom-up and top-down fabric
 ation methods. In particular\, the use of atomically thin 2D-materials and
  nanotubes as components to build fluidic conduits has pushed the limits o
 f fabrication to the Å-scale. In this talk\, I will discuss about angstro
 m (Å)-scale capillaries\, which can be dubbed as “2D-nothing”. The Å
 -capillary is an antipode of graphene\, created by what is left behind aft
 er extracting one-atomic layer out of a crystal [1]. What is intriguing he
 re is\, the dimensions of these channels being comparable to the size of a
  water molecule.\nThe Å-capillaries have helped probe several intriguing 
 molecular-scale phenomena experimentally\, including: water flow under ext
 reme atomic-scale confinement [1\,2] complete steric exclusion of ions\na\
 nconcentration gradient) and discuss the importance of ionic parameters th
 at are often overlooked in the selectivity between ions.\n[3\,4]\, specula
 r reflection and quantum effects in gas reflections off a surface [5]\, vo
 ltage gating of ion flows [6] translocation of DNA [7]. I will present ion
 ic flows induced by stimuli (electric\, pressure\, concentration gradient)
  and discuss the importance of ionic parameters that are often overlooked 
 in the selectivity between ions.\n\nReferences:\n[1] B. Radha et al.\, Mol
 ecular transport through capillaries made with atomic-scale precision. Nat
 ure 538\, 222\n(2016).\n[2] Y. You\, A. Ismail et al.\, arXiv:2203.13027\,
  to appear in Annual Reviews of Materials Research (2022).\n[3] A. Esfandi
 ar et al.\, Size effect in ion transport through angstrom-scale slits. Sci
 ence 358\, 511 (2017).\n[4] K. Gopinadhan et al.\, Complete ion exclusion 
 and proton transport through monolayer water. Science 363\,\n145 (2019).\n
 [5] A. Keerthi et al.\, Ballistic molecular transport through two-dimensio
 nal channels\, Nature (2018)\, 558\, 420.\n[6] T. Mouterde et al.\, Molecu
 lar streaming and voltage gated response in Å-scale channels. Nature 567\
 ,\n87 (2019).\n[7] W. Yang et al.\, Translocation of dna through ultrathin
  nanoslits. Advanced Materials 2007682\, (2021).
LOCATION:Dept of Chemistry\, Wolfson Lecture Theatre and Zoom
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