The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
E.l. Arancibia - One of the best experts on this subject based on the ideXlab platform.
-
Viscosimetric behaviour of n-alkanols with Triethylene Glycol monomethyl ether at different temperatures
Journal of Molecular Liquids, 2008Co-Authors: S. Aznarez, M.m. Elsa F. De Ruiz Holgado, E.l. ArancibiaAbstract:The thermodynamic functions of activation for viscous flow have been evaluated from the dynamic viscosity values of binary mixtures considering Eyring's transition state theory. Kinematic viscosities and densities of binary mixtures containing Triethylene Glycol monomethyl ether + (2-propanol or 2-butanol or 2-pentanol) over the whole mole fraction range of Triethylene Glycol monomethyl ether, at four different temperatures and atmospheric pressure were determined. Viscosity deviations and excess Gibbs energies of activation for viscous flow were calculated. All the values of viscosity deviations are negative, at all temperatures. The molar enthalpy of activation for viscous flow and molar entropy of activation for viscous flow functions were obtained. These functions with concentration of the Triethylene Glycol monomethyl ether show a minimum. These mixtures show a similar behaviour to that of the hydrocarbon-alkanol mixtures. The Grunberg-Nissan and Katti-Chaudrhi parameters were calculated and viscosity data were analyzed on the basis of their treatment. © 2007 Elsevier B.V. All rights reserved.Fil: Aznarez, Silvia. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Ingeniería en Procesos y Gestión Industrial; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Ferreyra de Ruiz Holgado, Mercedes Marta Elsa. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Ingeniería en Procesos y Gestión Industrial; ArgentinaFil: Arancibia, Eleuterio Luis. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Ingeniería en Procesos y Gestión Industrial; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; Argentin
-
Viscosimetric behaviour of n-alkanols with Triethylene Glycol monomethyl ether at different temperatures
Journal of Molecular Liquids, 2007Co-Authors: S. Aznarez, M.m. Elsa F. De Ruiz Holgado, E.l. ArancibiaAbstract:Abstract The thermodynamic functions of activation for viscous flow have been evaluated from the dynamic viscosity values of binary mixtures considering Eyring's transition state theory. Kinematic viscosities and densities of binary mixtures containing Triethylene Glycol monomethyl ether + (2-propanol or 2-butanol or 2-pentanol) over the whole mole fraction range of Triethylene Glycol monomethyl ether, at four different temperatures and atmospheric pressure were determined. Viscosity deviations and excess Gibbs energies of activation for viscous flow were calculated. All the values of viscosity deviations are negative, at all temperatures. The molar enthalpy of activation for viscous flow and molar entropy of activation for viscous flow functions were obtained. These functions with concentration of the Triethylene Glycol monomethyl ether show a minimum. These mixtures show a similar behaviour to that of the hydrocarbon–alkanol mixtures. The Grunberg–Nissan and Katti–Chaudrhi parameters were calculated and viscosity data were analyzed on the basis of their treatment.
Lars Porskjær Christensen - One of the best experts on this subject based on the ideXlab platform.
-
Triethylene Glycol bis 2 ethylhexanoate a new contact allergen identified in a spectacle frame
Contact Dermatitis, 2014Co-Authors: Klaus Ejner Andersen, M. E. Vestergaard, Lars Porskjær ChristensenAbstract:Summary Background Allergic reactions to spectacle frames are not unusual. A patient had a reproducible strong allergic patch test reaction to scrapings from the plastic material, and negative patch test results with available spectacle frame chemicals. Objectives To identify the culprit allergen in this patient's spectacle frame. Materials and methods An extract from the temple arms was analysed by gas chromatography mass spectrometry (GC-MS), and a major low molecular weight compound was detected. This compound was isolated by semi-preparative high-performance liquid chromatography and identified by GC-MS and nuclear magnetic resonance spectroscopy. The purified compound was diluted in ethanol, and a dilution series was prepared for patch testing. Results Triethylene Glycol bis(2-ethylhexanoate) was identified as the major compound in the extract. Patch testing of the patient proved that Triethylene Glycol bis(2-ethylhexanoate) was the causative allergen in the spectacle frame. Ten consecutive eczema patients tested as controls were negative. Conclusion Triethylene Glycol bis(2-ethylhexanoate) is a new, hitherto unreported contact allergen.
-
Triethylene Glycol bis(2‐ethylhexanoate) – a new contact allergen identified in a spectacle frame
Contact dermatitis, 2013Co-Authors: Klaus Ejner Andersen, M. E. Vestergaard, Lars Porskjær ChristensenAbstract:Summary Background Allergic reactions to spectacle frames are not unusual. A patient had a reproducible strong allergic patch test reaction to scrapings from the plastic material, and negative patch test results with available spectacle frame chemicals. Objectives To identify the culprit allergen in this patient's spectacle frame. Materials and methods An extract from the temple arms was analysed by gas chromatography mass spectrometry (GC-MS), and a major low molecular weight compound was detected. This compound was isolated by semi-preparative high-performance liquid chromatography and identified by GC-MS and nuclear magnetic resonance spectroscopy. The purified compound was diluted in ethanol, and a dilution series was prepared for patch testing. Results Triethylene Glycol bis(2-ethylhexanoate) was identified as the major compound in the extract. Patch testing of the patient proved that Triethylene Glycol bis(2-ethylhexanoate) was the causative allergen in the spectacle frame. Ten consecutive eczema patients tested as controls were negative. Conclusion Triethylene Glycol bis(2-ethylhexanoate) is a new, hitherto unreported contact allergen.
S. Aznarez - One of the best experts on this subject based on the ideXlab platform.
-
Viscosimetric behaviour of n-alkanols with Triethylene Glycol monomethyl ether at different temperatures
Journal of Molecular Liquids, 2008Co-Authors: S. Aznarez, M.m. Elsa F. De Ruiz Holgado, E.l. ArancibiaAbstract:The thermodynamic functions of activation for viscous flow have been evaluated from the dynamic viscosity values of binary mixtures considering Eyring's transition state theory. Kinematic viscosities and densities of binary mixtures containing Triethylene Glycol monomethyl ether + (2-propanol or 2-butanol or 2-pentanol) over the whole mole fraction range of Triethylene Glycol monomethyl ether, at four different temperatures and atmospheric pressure were determined. Viscosity deviations and excess Gibbs energies of activation for viscous flow were calculated. All the values of viscosity deviations are negative, at all temperatures. The molar enthalpy of activation for viscous flow and molar entropy of activation for viscous flow functions were obtained. These functions with concentration of the Triethylene Glycol monomethyl ether show a minimum. These mixtures show a similar behaviour to that of the hydrocarbon-alkanol mixtures. The Grunberg-Nissan and Katti-Chaudrhi parameters were calculated and viscosity data were analyzed on the basis of their treatment. © 2007 Elsevier B.V. All rights reserved.Fil: Aznarez, Silvia. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Ingeniería en Procesos y Gestión Industrial; Argentina. Universidad Nacional del Comahue; ArgentinaFil: Ferreyra de Ruiz Holgado, Mercedes Marta Elsa. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Ingeniería en Procesos y Gestión Industrial; ArgentinaFil: Arancibia, Eleuterio Luis. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Ingeniería en Procesos y Gestión Industrial; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Química del Noroeste. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Química del Noroeste; Argentin
-
Viscosimetric behaviour of n-alkanols with Triethylene Glycol monomethyl ether at different temperatures
Journal of Molecular Liquids, 2007Co-Authors: S. Aznarez, M.m. Elsa F. De Ruiz Holgado, E.l. ArancibiaAbstract:Abstract The thermodynamic functions of activation for viscous flow have been evaluated from the dynamic viscosity values of binary mixtures considering Eyring's transition state theory. Kinematic viscosities and densities of binary mixtures containing Triethylene Glycol monomethyl ether + (2-propanol or 2-butanol or 2-pentanol) over the whole mole fraction range of Triethylene Glycol monomethyl ether, at four different temperatures and atmospheric pressure were determined. Viscosity deviations and excess Gibbs energies of activation for viscous flow were calculated. All the values of viscosity deviations are negative, at all temperatures. The molar enthalpy of activation for viscous flow and molar entropy of activation for viscous flow functions were obtained. These functions with concentration of the Triethylene Glycol monomethyl ether show a minimum. These mixtures show a similar behaviour to that of the hydrocarbon–alkanol mixtures. The Grunberg–Nissan and Katti–Chaudrhi parameters were calculated and viscosity data were analyzed on the basis of their treatment.
Roel Prins - One of the best experts on this subject based on the ideXlab platform.
-
31P MAS NMR and Raman study of a Co(Zn)MoP/γ-Al2O3 HDS catalyst precursor containing Triethylene Glycol
Journal of Catalysis, 2005Co-Authors: Daniele Nicosia, Roel PrinsAbstract:Abstract The effect of Triethylene Glycol on phosphate-doped Co(Zn)Mo catalysts supported on γ-Al2O3 was studied by means of 31P magic angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy. 31P MAS NMR experiments, carried out on ZnMo/γ-Al2O3 doped with phosphate and Triethylene Glycol, suggested that the P 2 Mo 5 O 23 6 − species that formed in the impregnation solution decomposed to monophosphate and an Anderson-type aluminum molybdate species on contact with the support. The presence of Triethylene Glycol favored the formation of polyphosphate and PMo 12 O 40 3 − heteropolymolybdate species, but no P 2 Mo 5 O 23 6 − was detected. The use of paramagnetic cobalt instead of zinc cations had a paramagnetic effect on the 31P-NMR signal of the PMo 12 O 40 3 − , indicating that the PMo 12 O 40 3 − species are bound to the promoter atoms. The close proximity of the promoter and Mo allows a better decoration of MoS2 and improves the catalytic activity.
-
31p mas nmr and raman study of a co zn mop γ al2o3 hds catalyst precursor containing Triethylene Glycol
Journal of Catalysis, 2005Co-Authors: Daniele Nicosia, Roel PrinsAbstract:Abstract The effect of Triethylene Glycol on phosphate-doped Co(Zn)Mo catalysts supported on γ-Al2O3 was studied by means of 31P magic angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy. 31P MAS NMR experiments, carried out on ZnMo/γ-Al2O3 doped with phosphate and Triethylene Glycol, suggested that the P 2 Mo 5 O 23 6 − species that formed in the impregnation solution decomposed to monophosphate and an Anderson-type aluminum molybdate species on contact with the support. The presence of Triethylene Glycol favored the formation of polyphosphate and PMo 12 O 40 3 − heteropolymolybdate species, but no P 2 Mo 5 O 23 6 − was detected. The use of paramagnetic cobalt instead of zinc cations had a paramagnetic effect on the 31P-NMR signal of the PMo 12 O 40 3 − , indicating that the PMo 12 O 40 3 − species are bound to the promoter atoms. The close proximity of the promoter and Mo allows a better decoration of MoS2 and improves the catalytic activity.
Klaus Ejner Andersen - One of the best experts on this subject based on the ideXlab platform.
-
Triethylene Glycol bis 2 ethylhexanoate a new contact allergen identified in a spectacle frame
Contact Dermatitis, 2014Co-Authors: Klaus Ejner Andersen, M. E. Vestergaard, Lars Porskjær ChristensenAbstract:Summary Background Allergic reactions to spectacle frames are not unusual. A patient had a reproducible strong allergic patch test reaction to scrapings from the plastic material, and negative patch test results with available spectacle frame chemicals. Objectives To identify the culprit allergen in this patient's spectacle frame. Materials and methods An extract from the temple arms was analysed by gas chromatography mass spectrometry (GC-MS), and a major low molecular weight compound was detected. This compound was isolated by semi-preparative high-performance liquid chromatography and identified by GC-MS and nuclear magnetic resonance spectroscopy. The purified compound was diluted in ethanol, and a dilution series was prepared for patch testing. Results Triethylene Glycol bis(2-ethylhexanoate) was identified as the major compound in the extract. Patch testing of the patient proved that Triethylene Glycol bis(2-ethylhexanoate) was the causative allergen in the spectacle frame. Ten consecutive eczema patients tested as controls were negative. Conclusion Triethylene Glycol bis(2-ethylhexanoate) is a new, hitherto unreported contact allergen.
-
Triethylene Glycol bis(2‐ethylhexanoate) – a new contact allergen identified in a spectacle frame
Contact dermatitis, 2013Co-Authors: Klaus Ejner Andersen, M. E. Vestergaard, Lars Porskjær ChristensenAbstract:Summary Background Allergic reactions to spectacle frames are not unusual. A patient had a reproducible strong allergic patch test reaction to scrapings from the plastic material, and negative patch test results with available spectacle frame chemicals. Objectives To identify the culprit allergen in this patient's spectacle frame. Materials and methods An extract from the temple arms was analysed by gas chromatography mass spectrometry (GC-MS), and a major low molecular weight compound was detected. This compound was isolated by semi-preparative high-performance liquid chromatography and identified by GC-MS and nuclear magnetic resonance spectroscopy. The purified compound was diluted in ethanol, and a dilution series was prepared for patch testing. Results Triethylene Glycol bis(2-ethylhexanoate) was identified as the major compound in the extract. Patch testing of the patient proved that Triethylene Glycol bis(2-ethylhexanoate) was the causative allergen in the spectacle frame. Ten consecutive eczema patients tested as controls were negative. Conclusion Triethylene Glycol bis(2-ethylhexanoate) is a new, hitherto unreported contact allergen.
