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SUMMARY:IMX Seminar Series - Chiral Inorganic Nanostructures
DTSTART:20191021T131500
DTEND:20191021T141500
DTSTAMP:20260501T002332Z
UID:48bb17723b71f8b0cb1cf82fa337e581a004d07196776c1ed01ad100
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Nicholas Kotov\, University of Michigan USA\nEarly obser
 vation of strong circular dichroism for individual nanoparticles and their
  assemblies have developed into a rapidly expanding field of chiral inorga
 nic nanostructures. The chiral inorganic nanostructures encompass sophisti
 cated constructs from metals\, semiconductors\, ceramics\, and nanocarbon
 s with multiple chiral geometries with characteristic scales from Ångstr
 öms to microns. Such versatility enables their functional engineering ove
 r a broad range of physical and chemical properties inspiring multiple tec
 hnological realizations exemplified by biosensing and optoelectronics.  
  \nThis talk will address (1) the origin of the uniquely high values of o
 ptical anisotropy\; (2) the mechanisms of chirality transfer in inorganic 
 materials\; and (3) differences/similarities with chiral supramolecular\, 
 liquid crystal\, and biological assemblies.  The role of chiral inorganic
  nanostructures in homochirality of life on Earth will be briefly discusse
 d. An essential role of long-range correlations and a possibility of criti
 cal phenomena in chiral nanoassemblies that lead to emergence of exception
 ally complex structures will be demonstrated.  \nEssential milestones to
 ward utilization of chiral nanoscale assemblies in enantioselective cataly
 sis and metaoptics will be outlined. One of the novel venues for practical
  realizations of chiral nanoassemblies include photocatalytic C-C coupling
  in biomimetic chiral supraparticles and CD spectroscopy in terahertz spec
 tral window with chiroplasmonic kirigami composites.\nReferences: \nKotov\
 , N.A. Inorganic Nanoparticles as Protein Mimics Science\, 2010\, 330\, 18
 8.\n \nChen\, W. et al. Nanoparticle Superstructures Made by PCR: Collect
 ive Interactions of Nanoparticles and a New Principle for Chiral Materials
 . Nano Lett. 2009\, 9(5)\, 2153.\n \nSrivastava\, S.\; et al Light-Contro
 lled Self-Assembly of Semiconductor Nanoparticles into Twisted Ribbons. Sc
 ience\, 2010\, 327\, 1355–1359.\n \nJ.Yeom\, et al Chiral Templating of
  Self-Assembling Nanostructures by Circularly Polarized Light\, Nature Mat
 er. 2015\, 14\, 66.\n \nS. Jiang\, et al.  Chiral Ceramic Nanoparticles 
 of Tungsten Oxide and Peptide Catalysis\, JACS\, 2017\, 139\, 13701.\n \n
 Yeom et al\, Chiromagnetic Nanoparticles and Gels\, Science. 2018\, 359 (6
 372)\, 309-314.\n \nW. Choi et al\, Kirigami Modulators for Terahertz Chi
 roptical Spectroscopy\, Nature Materials\, 2019\, 18\, 820–826.\nBio: Pr
 of. Nicholas A. Kotov is working on conceptual foundations and technical r
 ealizations of biomimetic nanostructures. In the course of his studies he 
 demonstrated that self-organization is the unifying property of all nanosc
 ale matter. Examples of biomimetic nanostructures associated with his work
 s include graphite oxide\,- graphene- and clay-based layered biomimetic na
 nocomposites\, chiral nanomaterials\, and omni-dispersible colloids.  His
  contribution to technology include ultrastrong nacre-mimetic nanocomposit
 es\, soft neuro-prosthetic implants\, 3D tissue replicas for drug-testing\
 , chiral biosensors\, and cartilage-like electrolytes for batteries. Prof.
  Kotov is a founder of several start-up companies that commercialized bioi
 nspired nanomaterials for biomedical\, energy\, and automotive technologie
 s. \n \n\n \n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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