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DTSTAMP:20260414T222015
DTSTART:20141103T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/489617
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Near-Infrared Excited Nanoparticles: Synthesis and Applications –
  Prof. Fiorenzo Vetrone\, INRS
DESCRIPTION:Prof. Fiorenzo Vetrone\, Université du Québec\, Institut Na
 tional de la Recherche Scientifique\, Énergie\, Matériaux et Télécommu
 nications\, 1650 Boul. Lionel-Boulet\, Varennes\, QC J3X 1S2 (CANADA).Nano
 particles excited in the near-infrared (NIR) are quickly emerging as usefu
 l tools in diagnostic and therapeutic medicine. In particular\, the useful
 ness of these nanomaterials for applications in biology stems primarily fr
 om the fact that NIR light is silent to tissues thus minimizing autofluore
 scence\, possesses greater tissue penetration capabilities\, reduced scatt
 ering\, and does not cause photodamage to the specimen under investigation
 . Moreover\, tailoring of the nanoparticles’ absorption and emission wav
 elengths allow them to operate within the so-called “biological windows
 ”\, regions of the spectrum in which tissues are partly transparent.In t
 his regard\, lanthanide (Ln3+)-doped nanoparticles (LnNPs) are at the vang
 uard since they posses multiple absorption and emissions in these “biolo
 gical windows” (approximately 750-1000\, 1100-1450\, and 1500-1700 nm). 
 Thus\, it is feasible to excite within one window and observe emission in 
 another. Moreover\, with LnNPs\, it is possible to induce multiphoton exci
 ted luminescence (known as upconversion) where both the excitation (typica
 lly 980 nm) and emission lie within the “biological windows”. This mul
 tiphoton excitation process differs from what occurs in conventional multi
 photon excited materials where the absorption of photons is simultaneous. 
 In the case of LnNPs\, the multitude of long-lived “real” electronic e
 nergy states of the Ln3+ ions (from the partially filled 4f shell) allow f
 or sequential absorption of multiple NIR photons eliminating the need for 
 complex and expensive optical excitation. Thus\, upconverted luminescence 
 can be observed using an inexpensive commercial continuous wave diode lase
 r.         Here\, we present the synthesis and surface functional
 ization of various NIR excited nanoparticles and demonstrate how they can 
 be used for biological applications. Furthermore\, we show how they can be
  used as the cornerstone in the development of a multifunctional nanoplatf
 orm for the potential diagnostics and therapeutics of disease.Site web du 
 groupe du Prof. VetroneCette 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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