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SUMMARY:Building functional Materials from the nanoscale up
DTSTART:20190917T103000
DTEND:20190917T120000
DTSTAMP:20260508T104624Z
UID:6b791a3ea16be4994fc95c50f9c847b83da3fc510d1c209cc84e23bd
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Paul Ashby from Molecular Foundry - Berkeley Lab\nMy group 
 uses functional imaging to enhance materials design and synthesis. In this
  seminar I will present three recent projects.   In the first project\, w
 e assemble nanoparticles at the interface of immiscible liquids by strongl
 y binding them to surfactant molecules. These assemblies form stiff films 
 that stabilize the interface and allow us to create persistent liquid in l
 iquid structures that can be used as reconfigurable microfluidics\, reacti
 on vessels\, and even liquid ferromagnets. We also discovered that this sy
 stem shows anomalous emulsion phase inversion behavior and we use nanoscal
 e in-situ imaging to provide a detailed physical explanation. In the secon
 d project\, we characterize the factors that limit energy conversion effic
 iency in CIGS photovoltaic devices. Using high resolution Kelvin Probe For
 ce Microscopy\, we identified regions of electron accumulation near the P-
 N junction where a 100mV barrier reduces the open circuit voltage of the d
 evice.  We also characterized deep negatively charged hole traps througho
 ut the active layer as a source of recombination. In the third project\, w
 e are creating bacterial tissue. We modify the genome of a fresh water bac
 terium C. Crescentus to express S-layer protein displaying a spy-tag mot
 if. We use spycatcher functionalized nanoparticles to assemble the cells i
 nto a stiff tissue with very different mechanical properties than typical 
 biofilms due to their tight specific crosslinkers.\n \n 
LOCATION:PH H3 31 https://plan.epfl.ch/?dim_floor=3&lang=fr&dim_lang=fr&tr
 ee_groups=centres_nevralgiques%2Cacces%2Cmobilite_reduite%2Censeignement%2
 Ccommerces_et_services%2Cvehicules%2Cinfrastructure_plan_grp&tree_grou
STATUS:CONFIRMED
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