Laser-Induced Thermal Expansion of H2SO4-Intercalated Graphite Lattice
Anno: 2015
Autori: Carotenuto G., Longo A., Nicolais L., De Nicola S., Pugliese E.,Ciofini M., Locatelli M., Lapucci A., Meucci R.
Affiliazione autori: CNR, Inst Polymers Composites & Biomat, I-80125 Naples, Italy; Complesso Univ Monte St Angelo, SPIN Natl Res Council, I-80126 Naples, Italy; CNR, Natl Inst Opt, I-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.
Giornale/Rivista: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 119 (28) Da Pagina: 15942 A: 15947
Parole chiavi: 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/jp512800jCitazioni: 12dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-10-06Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
