Documents disponibles écrits par cet auteur

Catalyst-free, one-step synthesis of olivary-shaped carbon from olive oil / Pol, Vilas G. in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5691–5695 Titre : Catalyst-free, one-step synthesis of olivary-shaped carbon from olive oil Type de document : texte imprimé Auteurs : Pol, Vilas G., Auteur ; Jose M. Calderon-Moreno, Auteur ; P. Thiyagarajan, Auteur Année de publication : 2009 Article en page(s) : pp. 5691–5695 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Olivary-shaped  carbon  particles  Closed  reactor  Olive  oil  Autogenic  pressure Résumé : High-purity olivary-shaped carbon particles with a diameter of ∼1.5 μm at the middle and a length of ∼3 μm were synthesized by the thermolysis [700 °C] of olive oil under its autogenic pressure in a closed reactor. We employed in situ mass spectrometry to monitor the volatile gases responsible for the autogenic pressure generated during the thermolysis of olive oil in the closed reactor and also measured the autogenic pressure as a function of temperature. The olivary shape of as-prepared microcarbon is verified by scanning electron microscopy and the composition by C,H,N−S and energy-dispersive X-ray analysis. The structural information is determined by powder X-ray diffraction and Raman spectroscopy, while the magnetic properties are determined by electron paramagnetic resonance. We propose a putative mechanism for their formation by using all the complementary data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900095v [article] Catalyst-free, one-step synthesis of olivary-shaped carbon from olive oil [texte imprimé] / Pol, Vilas G., Auteur ; Jose M. Calderon-Moreno, Auteur ; P. Thiyagarajan, Auteur . - 2009 . - pp. 5691–5695. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5691–5695 Mots-clés : Olivary-shaped  carbon  particles  Closed  reactor  Olive  oil  Autogenic  pressure Résumé : High-purity olivary-shaped carbon particles with a diameter of ∼1.5 μm at the middle and a length of ∼3 μm were synthesized by the thermolysis [700 °C] of olive oil under its autogenic pressure in a closed reactor. We employed in situ mass spectrometry to monitor the volatile gases responsible for the autogenic pressure generated during the thermolysis of olive oil in the closed reactor and also measured the autogenic pressure as a function of temperature. The olivary shape of as-prepared microcarbon is verified by scanning electron microscopy and the composition by C,H,N−S and energy-dispersive X-ray analysis. The structural information is determined by powder X-ray diffraction and Raman spectroscopy, while the magnetic properties are determined by electron paramagnetic resonance. We propose a putative mechanism for their formation by using all the complementary data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900095v

Measurement of autogenous pressure and dissociated species during the thermolysis of mesitylene for the synthesis of monodispersed, pure, paramagnetic carbon particles / Pol, Vilas G. in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1484–1489 Titre : Measurement of autogenous pressure and dissociated species during the thermolysis of mesitylene for the synthesis of monodispersed, pure, paramagnetic carbon particles Type de document : texte imprimé Auteurs : Pol, Vilas G., Auteur ; P. Thiyagarajan, Auteur Année de publication : 2009 Article en page(s) : p. 1484–1489 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : spherical  carbon  particles  Autogenous  pressure  Mesitylene Résumé : Two reaction parameters are important for the synthesis of entirely monodispersed, pure, paramagnetic spherical carbon particles. The experimental setup is developed to measure in situ autogenous pressure as a function of temperature during the thermolysis of mesitylene in a closed reactor. In situ mass spectrometry analyzed the dissociated species during the heating cycle of mesitylene as a function of temperature. The morphology, structure, composition, and magnetic properties of the as-prepared spherical carbon particles are characterized by using SEM, XRD, Raman spectroscopy, EDX, CHNS analysis, and EPR. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014928 [article] Measurement of autogenous pressure and dissociated species during the thermolysis of mesitylene for the synthesis of monodispersed, pure, paramagnetic carbon particles [texte imprimé] / Pol, Vilas G., Auteur ; P. Thiyagarajan, Auteur . - 2009 . - p. 1484–1489. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1484–1489 Mots-clés : spherical  carbon  particles  Autogenous  pressure  Mesitylene Résumé : Two reaction parameters are important for the synthesis of entirely monodispersed, pure, paramagnetic spherical carbon particles. The experimental setup is developed to measure in situ autogenous pressure as a function of temperature during the thermolysis of mesitylene in a closed reactor. In situ mass spectrometry analyzed the dissociated species during the heating cycle of mesitylene as a function of temperature. The morphology, structure, composition, and magnetic properties of the as-prepared spherical carbon particles are characterized by using SEM, XRD, Raman spectroscopy, EDX, CHNS analysis, and EPR. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8014928

Solvent-free fabrication of ferromagnetic Fe3O4 octahedra / Pol, Vilas G. in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 920–924 Titre : Solvent-free fabrication of ferromagnetic Fe3O4 octahedra Type de document : texte imprimé Auteurs : Pol, Vilas G., Auteur ; Daemen, Luke L., Auteur ; Vogel, Sven, Auteur Année de publication : 2010 Article en page(s) : pp 920–924 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solvent-free  Ferromagnetic  Fe3O4  Octahedra. Résumé : The controlled thermolysis of a presynthesized single precursor, Fe3(CH3COO)6(OH)2CH3COO, in a closed reactor at 700 °C in an inert atmosphere produced ferromagnetic Fe3O4 octahedra without using solvent or catalyst. The octahedral shape with the 6−10 μm diameter of Fe3O4 is realized using field emission scanning electron microscope, and the composition, with an attached energy dispersive X-ray analyzer. The single-crystalline face-centered cubic structure of Fe3O4 octahedra is analyzed by X-ray diffraction measurements, further supported by Raman spectroscopy and transmission electron microscopy. The thermogravimetric analysis measured the amount of carbon present on the Fe3O4 octahedra surfaces. The vibrating magnetometer corroborated ferromagnetic behavior of Fe3O4 octahedra with 150 Oe coercive force, 48 emu/g saturation magnetization, and 5 emu/g remnent magnetization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011062 [article] Solvent-free fabrication of ferromagnetic Fe3O4 octahedra [texte imprimé] / Pol, Vilas G., Auteur ; Daemen, Luke L., Auteur ; Vogel, Sven, Auteur . - 2010 . - pp 920–924. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 920–924 Mots-clés : Solvent-free  Ferromagnetic  Fe3O4  Octahedra. Résumé : The controlled thermolysis of a presynthesized single precursor, Fe3(CH3COO)6(OH)2CH3COO, in a closed reactor at 700 °C in an inert atmosphere produced ferromagnetic Fe3O4 octahedra without using solvent or catalyst. The octahedral shape with the 6−10 μm diameter of Fe3O4 is realized using field emission scanning electron microscope, and the composition, with an attached energy dispersive X-ray analyzer. The single-crystalline face-centered cubic structure of Fe3O4 octahedra is analyzed by X-ray diffraction measurements, further supported by Raman spectroscopy and transmission electron microscopy. The thermogravimetric analysis measured the amount of carbon present on the Fe3O4 octahedra surfaces. The vibrating magnetometer corroborated ferromagnetic behavior of Fe3O4 octahedra with 150 Oe coercive force, 48 emu/g saturation magnetization, and 5 emu/g remnent magnetization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011062