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UID:69dea662cd4be
DTSTAMP:20260414T164106
DTSTART:20150521T110000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20150521T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/611027
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Conférence du Professeur John Rabolt (Delaware)
DESCRIPTION:Titre : AFM-IR Spectroscopy and Imaging of Polymer Nanofibers a
 nd Thin Films at the Nanoscale.Endroit : Pavillon Roger-Gaudry\, salle G-7
 15 à 11 hHôte : Professeur Christian PellerinLa conférence sera prononc
 ée (en anglais) par le professeur John Rabolt\, du département des scien
 ces des matériaux et de génie de l'University of Delaware.Résumé : The
  combination of atomic force microscopy (AFM) and infrared (IR) spectrosco
 py is an extremely powerful tool that can provide topographic information 
 that can be correlated with chemical\, conformational and molecular orient
 ation information at a spatial resolution of 50-100 nm.  Using an AFM-IR
  instrument\, we have explored the correlation between structure\, process
 ing and chain orientation/crystallinity in biodegradable and biocompatible
  poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] (PHBHx) electrospun
  nanofibers and thin films and tested the hypothesis that different proces
 sing protocols can alter the concentration of the stable α-crystalline fo
 rm and the metastable β-crystalline form.  The ability to obtain IR spec
 tra at high spatial resolutions has allowed us to probe\, for example\, cr
 ystalline populations as a function of nanofiber diameter and as a functio
 n of location within the fiber and we have observed\, for the first time\,
  the existence of a core-shell structure in a single electrospun nanofiber
 .  In addition\, the spectroscopic imaging capability of the AFM-IR instr
 ument has been utilized to create a map of α and β crystalline content a
 s a function of location within the nanofiber and this clearly verifies th
 e existence of a core-shell structure. Information supplémentaireAnnonce 
 PDF de la conférence
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