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URL:https://murmitoyen.com/events/vanille/udem/detail/166151
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Dialing microstructure and protonic conductivity in biomaterials wi
 th hydrogen bonding
DESCRIPTION:Marco Rolandi\, Materials Science and Engineering Department\,
  University of Washington\, Seattle\, WA\, USA Hydrogen bonding is omni
 present in nature and\, in addition to water\, determines the structure an
 d properties of most biological molecules. These molecules include the ess
 ential components of living systems such as nucleic acids\, lipids\, prote
 ins\, and polysaccharides. The ability to tailor the properties of these c
 omponents has contributed to great advances in bionanotechnology.Here\, I 
 will present two examples of dialing microstructure and conductivity with 
 hydrogen bonding in a polysaccharide model system\, chitin. Chitin is pres
 ent in the insect cuticle\, squid pen\, the shell of crustaceans\, and the
  wall of certain fungi. In the first example\, hydrogen bonding is disrupt
 ed in squid pen β-chitin with dissolution in a protic solvent to yield se
 lf-assembled α-chitin nanofibers upon drying. This “chitin nanofiber in
 k” is coupled with airbrushing\, replica molding\, and microcontact prin
 ting to manufacture chitin nanofiber structures across length scales. Appl
 ications of these structures in tissue engineering and drug delivery will 
 be discussed. Co-assembly in a protein matrix yields a nanofiber biocompos
 ite with excellent mechanical and optical properties. In the second exampl
 e\, chitin is functionalized with hydrophilic groups to increase hydrogen 
 bonding with water. This increased hydrogen bonding creates proton wires a
 long which H+ translate following the Grotthuss mechanism. Doped wires wit
 h H+ from acidic groups and doped wires with OH- from basic groups are the
  foundations to complimentary protonic field effect transistors analogous 
 to CMOS.In nature\, protonic and ionic (not electronic) currents are used 
 to communicate information across cell membranes. As such\, these biocompa
 tible protonic devices are a versatile biotic-abiotic interface for bionan
 oelectronics.   Site web du groupe du Prof. RolandiCette conférence es
 t présentée par le RQMP Versant Nord du Département de physique de l'U
 niversité de Montréal et le Département de génie physique de Polytechn
 ique Montréal.
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