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UID:69dbd94424005
DTSTAMP:20260412T134124
DTSTART:20170327T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/758585-conference-du-
 professeur-mark-t-mcdermott
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Conférence du Professeur Mark T. McDermott
DESCRIPTION:Cette conférence sera prononcée (en anglais) par le Profes
 seur Mark T. McDermott de l'Université de l'Alberta.
\nRésumé : The u
 se of diazonium salts to chemically modify graphitic carbon surfaces dates
  back to the early 90s. Since then these types of regents have been used t
 o tailor the surface chemistry of a variety of materials. Our interest in 
 thin gold films for biosensing lead us to explore the structure and proper
 ties of diazonium derived aryl films on gold. The resulting aryl films are
  anchored to the gold surface via a stronger interaction than the gold-sul
 fur bond of a thiol-derived self-assembled monolayer. Another important ch
 aracteristic is the ability to control the thickness of the films from mon
 o-to multilayers by tuning the electrochemical deposition conditions. We h
 ave conducted a number of studies to probe the stability of diazonium-deri
 ved films on gold as well as the nature of the interaction. Nitrobenzene l
 ayers from the corresponding thiol and diazonium cation were directly comp
 ared. Under a number of conditions\, diazonium derived films are more stab
 le than the thiolate counterpart. This led us to explore films consisting 
 of both thiol-derived and diazonium-derived components. We have found inte
 resting reactivity between thiolate monolayers and diazonium cations\, whi
 ch will be discussed. Finally\, we have utilized diazonium cations to tail
 or the surface chemistry of nanoparticles. Diazonium derived films of gold
  nanoparticles enable the probing of the nature of interaction using surfa
 ce enhanced Raman spectroscopy. These reagents are also useful in controll
 ing the chemistry of non-metallic nanoparticles. We have used this chemist
 ry to modify cellulose nanocrystals (CNC) which enables their incorporatio
 n into polymers. The resulting nanocomposite materials exhibit enhanced me
 chanical properties.
\nCette conférence est présentée par le RQMP Versa
 nt Nord du Département de physique de l'Université de Montréal et de G
 énie physique de la Polytechnique.
\nInformation supplémentaireAffiche 
 de la conférence
\nPage web au département à UofAPage web at NINT
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