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URL:https://murmitoyen.com/events/vanille/udem/detail/719607-sculpting-nano
 porous-and-nanocomposite-structures-by-liquid-metal-dealloying-n-alain-kar
 ma-northeastern
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Sculpting nanoporous and nanocomposite structures by liquid metal d
 ealloying –  Alain Karma (Northeastern)
DESCRIPTION:Alain Karma\, Physics Department and Center for Interdisciplin
 ary Research on Complex Systems Northeastern University\, Boston\, USA 

 \nAbstract:
\nLiquid metal dealloying (LMD) has emerged as a novel techniq
 ue to produce topologically complex nanoporous and nanocomposite structur
 es with ultra-high interfacial area and other unique properties relevant 
 for diverse materials applications\, exemplified by Si for battery anodes
  with extremely long cycle fatigue\, nonporous Nb for electrolytic capaci
 tors\, or Cu-Tananocomposites with outstanding mechanical properties. LMD 
 offers similar advantages as the traditional electrochemical dealloying m
 ethod\, but is applicable to a larger class of materials by using a liqui
 d metal instead of an acid bath as conduit for the selective dissolution 
 of one element of a multicomponent alloy. How dealloyed structures form h
 as remained somewhat of a mystery. I will review the rich history of deal
 loying and discuss the results of a combined experimental and computation
 al modeling study [1] that sheds light on basic mechanisms of interfacial
  pattern formation during LMD. Simulations reveal how diffusion-limited i
 nterfacial and bulk transport phenomena interact to form a rich variety o
 f topologically disconnected and connected structures. Moreover\, analysi
 s of the results yields scaling laws governing nano/microstructural lengt
 hscales and dealloying kinetics that provide a quantitative theoretical b
 asis for controlling dealloyed structures.
\n[1]  “Topology-generating
  interfacial pattern formation during liquid metal dealloying”\, P.-A. 
 Geslin\, I. McCue\, J. Erlebacher\, and A. Karma\, Nature Communications 
 6\, 9887 (2015).
\nSite web du groupe de  http://www.northeastern.edu/cos
 /faculty/alain-karma/
\nCette conférence est présentée par le RQMP Vers
 ant Nord du Département de physique de l'Université de Montréal et le
  Département de génie physique de Polytechnique Montréal.
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