Laser-Induced Thermal Expansion of H2SO4-Intercalated Graphite Lattice
Authors: Carotenuto G., Longo A., Nicolais L., De Nicola S., Pugliese E.,Ciofini M., Locatelli M., Lapucci A., Meucci R.
Autors Affiliation: Institute for Polymers, Composites and Biomaterials − National Research Council, Mostra d’oltremare Pad 20, Viale Kennedy 54, 80125 Naples, Italy
SPIN − National Research Council, Complesso Universitario Monte Sant’Angelo, Via Cinthia, 80126 Naples, Italy
National Institute of Optics − National Research Council, Largo E. Fermi 6, 50125 Florence, Italy
Abstract: Intercalated graphite materials allow studying reactions occurring in confined chemical conditions. In this work, we investigate the sulfuric acid intercalated graphite exfoliation process using a simple technique based on the continuous-wave (CW) infrared (IR) laser irradiation of graphite flakes. Using Kissinger and Ozawa methods, the activation energy of H2SO4-intercalated graphite was determined to be less than 100 kJ mol(-1). The laser-assisted reaction process was found to be characterized by a threshold temperature of about 140 degrees C followed by a fast rate of heating. The large amount of volatilized hot gases caused a violent expansion of the graphite flake. Morphological changes undergone by irradiated graphite flakes have been analyzed using a combination of thermal and visible imaging techniques, which allowed for the quantitative determination of temporal evolution of the thermal field during the heating stage and expansion of the flake.
Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 119 (28) Pages from: 15942 to: 15947
KeyWords: Activation energy; Graphite; Imaging techniques, Activation energy of h; Chemical conditions; Intercalated graphite; Irradiated graphite; Laser-assisted reactions; Morphological changes; Quantitative determinations; Threshold temperatures, Thermal expansionDOI: 10.1021/jp512800jCitations: 7data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-07-05References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here