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Probing nanomaterials with absorption and emission of light Dr. J. Hodak J. Hodak obtained his Licenciatura en Cs. Quimicas degree in 1995, at the DQIAQF. Later in 2001 he obtained his PhD degree from the Department of Chemistry, Notre Dame University (Indiana, USA). He worked as a Research Associate at the Joint Institute for Laboratory Astrophysics, University of Colorado at Boulder, between 2001 and 2004, with the Prof. David Nesbitt group. He was a Foreign Researcher - Lecturer at the Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand from 2005 to 2010. He now works as an Investigador Independiente CONICET in INQUIMAE, and he is also Profesor Adjunto at the DQIAQF. His current line of research is the study of physical chemistry of materials, using spatially resolved optical fluorescence and absorption techniques, and ultrafast transient spectroscopy. Absorption and fluorescence emission allow simple means of accessing nanoscopic processes at nanoscopic scales. I will discuss the use of fluorescencemeasurements to study the permeation process of a fluorogenic probe across the walls of silica nano-shells, and the use of spatially resolved abrotption-emision experiments to study graphene oxide.A nanoparticle located in the interior of a nano-shell permits to activate a fluorescent probe to reveal kinetics parameters of diffusion across the nanoshell wall. Graphene oxide (GO) is a two dimensional material that can act as an insulator or a semiconductor depending on the degree of oxidation and it may be converted to graphene by chemical or photochemical means. I will present spatially resolved studies of the photo-reduction of GO single layers.Several processes are found to occur sequentially during the GO photo-reduction with optical properties as well as kinetic parameters showing heterogeneityacross individual GO fragments. |
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ORGANIZING COMMITTEE: S. Ledesma . M. G. Capeluto . C. Iemmi . M. Larotonda . D. Skigin . H. Grecco SECRETARY: María Cambón |