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DTSTAMP:20260406T110716
DTSTART:20110214T150000
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URL:https://murmitoyen.com/events/vanille/udem/detail/34697
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Hierarchical Self-Assembly of Polymer-Functionalized Nanoparticles:
  From Molecular Mimics to Microfluidics
DESCRIPTION:Cette conférence sera prononcée par le professeur Matthew Mo
 ffitt du Département de chimie de l'University of Victoria. Elle sera do
 nnée en anglais. Résumé : Emerging strategies for assembling inorgani
 c nanoparticles into ensembles with multiscale organization are establish
 ing a new paradigm for the synthesis of devices and functional materials w
 ith applications ranging from drug-delivery to photonics. In our lab\, we
  develop a combination of bottom-up and top-down approaches to generating 
 hierarchical colloids of functional inorganic nanoparticles and polymers 
 with structural control. In one general strategy\, 'smart nanoparticles' a
 re designed with surface characteristics that mimic molecular amphiphiles
 . We will discuss a recent example from our group in ionic block copolyme
 r self-assembly that provides the inspiration and design strategy for nano
 particle building blocks with the essential chemical and conformational f
 eatures of ionic block copolymer chains in aqueous media. Inorganic nanop
 articles with surface-tethered mixed brushes of hydrophobic and chargeabl
 e hydrophilic chains are shown to self-assemble in polar solvent mixtures 
 into unprecedented hierarchical superstructures analogous to known ionic 
 block copolymer aggregates\, but with complex organizations of nanopartic
 les in three dimensions. A second strategy focuses on directing self-assem
 bly from the top-down using external force fields.  Specifically\, we ha
 ve studied how tuneable shear-fields in microfluidic reactors can provide
  control over shape\, size and polydispersity of colloidal aggregates of 
 nanoparticles and block copolymers. By virtue of confined volumes and extr
 emely high shear fields\, the microfluidic environment provides a new 'pr
 ocessing handle' on molecular level self-assembly\, allowing structure to
  be controlled using top-down parameters such as flow rate for a given set
  of chemical conditions. Information supplémentaire
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