Nicolas Campo - Academia.edu (original) (raw)
Papers by Nicolas Campo
Radiation Effects and Defects in Solids, 2007
Gas desorption in vacuum from electron irradiated ultra high molecular weight polyethylene (PE) i... more Gas desorption in vacuum from electron irradiated ultra high molecular weight polyethylene (PE) is measured with a high sensible mass quadrupole spectrometer. Measurements are performed in thick PE irradiated with 5 MeV electron beams at doses of the order of tens of kGy. The irradiation modifies the PE molecules producing dehydrogenation, emission of different Cx-Hy groups, C-enrichment and carbon cross-linking
Radiation Effects and Defects in Solids, 2008
... Authors: Visco, AM 1 ; Campo, N. 1 ; Beltrano, JJ 2 ; Torrisi, L. 2. ... Affiliations: 1: Dip... more ... Authors: Visco, AM 1 ; Campo, N. 1 ; Beltrano, JJ 2 ; Torrisi, L. 2. ... Affiliations: 1: Dipartimento di Chimica Industriale ed Ingegneria dei Materiali, Facolta d'Ingegneria, Universita di Messina, Sant'Agata, Messina, Italy 2: Dipartimento di Fisica, Facolta di Scienze, Universita di ...
Radiation Effects and Defects in Solids, 2003
Ultra-high-molecular-weight-polyethylene (UHMWPE) surfaces are characterized in terms of roughnes... more Ultra-high-molecular-weight-polyethylene (UHMWPE) surfaces are characterized in terms of roughness and wetting. Changes in the surface morphology of the polymer were induced macroscopically by mechanical friction and microscopically by ion implantation. The ion irradiation was obtained by using 300 keV Xe+ beams with doses ranging between 10(14) and 10(15) ions/cm(2) . Roughness and wetting measurements were performed in order to investigate
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2010
A Nd:Yag pulsed laser, 3ns pulse width, 150mJ pulse energy, operating at the second harmonics (53... more A Nd:Yag pulsed laser, 3ns pulse width, 150mJ pulse energy, operating at the second harmonics (532nm) has been used to irradiate in air polyethylene thin films.The thermal and chemical effects induced by the laser irradiation in the polymer are responsible of the hydrogen and CxHy groups emission at long irradiation times. A special study, concerning the welding effect between two
Radiation Effects and Defects in Solids, 2010
A Nd:YAG laser operating at 532 nm wavelength, 3 ns pulse duration, 150 mJ pulse energy and 10 Hz... more A Nd:YAG laser operating at 532 nm wavelength, 3 ns pulse duration, 150 mJ pulse energy and 10 Hz repetition rate is employed to irradiate in air polyethylene-based polymers and to induce thin film welding. Polyethylene thin films of different densities, with and without enclosed carbon nanotubes, have been irradiated at different exposition times. Measurements of static tensile, shear stress and morphology permitted us
Radiation Effects and Defects in Solids, 2004
Effects of radiation damage in ultra high molecular weight polyethylene are investigated by using... more Effects of radiation damage in ultra high molecular weight polyethylene are investigated by using energetic electron beams. Special attention is devoted to the mechanical characterization of the polymer, before and after the modification induced by 5 MeV electrons, as a function of the absorbed dose. Elastic modules, ultimate tensile and compressive strengths and roughness and hardness, have been measured in
Radiation Effects and Defects in Solids, 2008
Ultra-high-molecular-weight polyethylene (UHMWPE) is a versatile polymer employed in many fields ... more Ultra-high-molecular-weight polyethylene (UHMWPE) is a versatile polymer employed in many fields for its good chemical-physics characteristics. In particular, it is widely utilized in biomedical fields due to its high degree of biocompatibility and its easy control on wettability of the surface. In this work, the laser radiation has been utilized to effect different degrees of change to the wettability characteristics
Applied Physics A-materials Science & Processing, 2011
This paper reports a study of the laser welding of polymeric joints composed by two polyethylene ... more This paper reports a study of the laser welding of polymeric joints composed by two polyethylene sheets, one pristine and the other filled by carbon nanotubes. In order to know the material modifications occurring during the laser exposure and the phenomena that seal the polymeric sheets, the physical, chemical and mechanical features of the welded area were analysed. The mechanical resistance of the welded joint and the structural changes of the polymer were checked by mechanical shear tests, absorption coefficient measurements, calorimetric analyses, mass quadrupole spectrometry and electron microscopy. The welding effectiveness was investigated as a function of the filler concentration.
Radiation Effects and Defects in Solids, 2004
Ultra-high-molecular-weight-polyethylene (UHMWPE) is irradiated with 5 MeV electrons in vacuum at... more Ultra-high-molecular-weight-polyethylene (UHMWPE) is irradiated with 5 MeV electrons in vacuum at different doses. The radiation effects induced by the electron irradiation are investigated by using different physical analyses such as mechanical tensile stress measurement, hardness measurements, specific heat measurements, infrared molecular absorption, surface wetting, polymer darkness and morphological scanning electron microscopy. The results indicate that the effects induced by high
Radiation Effects and Defects in Solids, 2008
... Phys. Rev. Lett , 85: 5186 [CrossRef], [PubMed], [Web of Science ®] View all references, 1212... more ... Phys. Rev. Lett , 85: 5186 [CrossRef], [PubMed], [Web of Science ®] View all references, 1212. Corio, P., Santos, PS, Pimenta, MA and Dresselhaus, MS 2002. Chem. Phys. Lett. ... Corio, P., Santos, PS, Pimenta, MA and Dresselhaus, MS 2002. Chem. Phys. Lett. , 360: 557–564. ...
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2008
Ion implantation is a process in which ions are accelerated toward a substrate at energies high e... more Ion implantation is a process in which ions are accelerated toward a substrate at energies high enough to bury them just below the surface substrate in order to modify the surface characteristics. Laser-produced plasma is a very suitable and low cost technique in the production of ion sources. In this work, a laser ion source is developed by a UV pulsed laser of about 10 8 W/cm 2 power density, employing a C target and a post ion acceleration of 40 kV to increase the ion energy. In this work, we implanted C ions on ultra-high-molecularweight-polyethylene (UHMWPE) and low-density polyethylene (LDPE). We present the preliminary results of surface property modifications for both samples. In particular, we have studied the modifications of the surface micro-hardness of the polymers by applying the ''scratch test" method as well as the hydrophilicity modifications by the contact angle measurements.
Radiation Effects and Defects in Solids, 2006
The diffusion coefficient of light gas species in polyethylene is measured through a special appa... more The diffusion coefficient of light gas species in polyethylene is measured through a special apparatus which uses a vacuum chamber and a mass quadrupole spectrometer in order to detect the diffused species. Measurements are performed in thin polyethylene films with different molecular weight, which have been irradiated in air with 5 MeV electron beams. The irradiation modifies the polyethylene-inducing cross-linking
Radiation Effects and Defects in Solids, 2007
Gas desorption in vacuum from electron irradiated ultra high molecular weight polyethylene (PE) i... more Gas desorption in vacuum from electron irradiated ultra high molecular weight polyethylene (PE) is measured with a high sensible mass quadrupole spectrometer. Measurements are performed in thick PE irradiated with 5 MeV electron beams at doses of the order of tens of kGy. The irradiation modifies the PE molecules producing dehydrogenation, emission of different Cx-Hy groups, C-enrichment and carbon cross-linking
Radiation Effects and Defects in Solids, 2008
... Authors: Visco, AM 1 ; Campo, N. 1 ; Beltrano, JJ 2 ; Torrisi, L. 2. ... Affiliations: 1: Dip... more ... Authors: Visco, AM 1 ; Campo, N. 1 ; Beltrano, JJ 2 ; Torrisi, L. 2. ... Affiliations: 1: Dipartimento di Chimica Industriale ed Ingegneria dei Materiali, Facolta d'Ingegneria, Universita di Messina, Sant'Agata, Messina, Italy 2: Dipartimento di Fisica, Facolta di Scienze, Universita di ...
Radiation Effects and Defects in Solids, 2003
Ultra-high-molecular-weight-polyethylene (UHMWPE) surfaces are characterized in terms of roughnes... more Ultra-high-molecular-weight-polyethylene (UHMWPE) surfaces are characterized in terms of roughness and wetting. Changes in the surface morphology of the polymer were induced macroscopically by mechanical friction and microscopically by ion implantation. The ion irradiation was obtained by using 300 keV Xe+ beams with doses ranging between 10(14) and 10(15) ions/cm(2) . Roughness and wetting measurements were performed in order to investigate
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2010
A Nd:Yag pulsed laser, 3ns pulse width, 150mJ pulse energy, operating at the second harmonics (53... more A Nd:Yag pulsed laser, 3ns pulse width, 150mJ pulse energy, operating at the second harmonics (532nm) has been used to irradiate in air polyethylene thin films.The thermal and chemical effects induced by the laser irradiation in the polymer are responsible of the hydrogen and CxHy groups emission at long irradiation times. A special study, concerning the welding effect between two
Radiation Effects and Defects in Solids, 2010
A Nd:YAG laser operating at 532 nm wavelength, 3 ns pulse duration, 150 mJ pulse energy and 10 Hz... more A Nd:YAG laser operating at 532 nm wavelength, 3 ns pulse duration, 150 mJ pulse energy and 10 Hz repetition rate is employed to irradiate in air polyethylene-based polymers and to induce thin film welding. Polyethylene thin films of different densities, with and without enclosed carbon nanotubes, have been irradiated at different exposition times. Measurements of static tensile, shear stress and morphology permitted us
Radiation Effects and Defects in Solids, 2004
Effects of radiation damage in ultra high molecular weight polyethylene are investigated by using... more Effects of radiation damage in ultra high molecular weight polyethylene are investigated by using energetic electron beams. Special attention is devoted to the mechanical characterization of the polymer, before and after the modification induced by 5 MeV electrons, as a function of the absorbed dose. Elastic modules, ultimate tensile and compressive strengths and roughness and hardness, have been measured in
Radiation Effects and Defects in Solids, 2008
Ultra-high-molecular-weight polyethylene (UHMWPE) is a versatile polymer employed in many fields ... more Ultra-high-molecular-weight polyethylene (UHMWPE) is a versatile polymer employed in many fields for its good chemical-physics characteristics. In particular, it is widely utilized in biomedical fields due to its high degree of biocompatibility and its easy control on wettability of the surface. In this work, the laser radiation has been utilized to effect different degrees of change to the wettability characteristics
Applied Physics A-materials Science & Processing, 2011
This paper reports a study of the laser welding of polymeric joints composed by two polyethylene ... more This paper reports a study of the laser welding of polymeric joints composed by two polyethylene sheets, one pristine and the other filled by carbon nanotubes. In order to know the material modifications occurring during the laser exposure and the phenomena that seal the polymeric sheets, the physical, chemical and mechanical features of the welded area were analysed. The mechanical resistance of the welded joint and the structural changes of the polymer were checked by mechanical shear tests, absorption coefficient measurements, calorimetric analyses, mass quadrupole spectrometry and electron microscopy. The welding effectiveness was investigated as a function of the filler concentration.
Radiation Effects and Defects in Solids, 2004
Ultra-high-molecular-weight-polyethylene (UHMWPE) is irradiated with 5 MeV electrons in vacuum at... more Ultra-high-molecular-weight-polyethylene (UHMWPE) is irradiated with 5 MeV electrons in vacuum at different doses. The radiation effects induced by the electron irradiation are investigated by using different physical analyses such as mechanical tensile stress measurement, hardness measurements, specific heat measurements, infrared molecular absorption, surface wetting, polymer darkness and morphological scanning electron microscopy. The results indicate that the effects induced by high
Radiation Effects and Defects in Solids, 2008
... Phys. Rev. Lett , 85: 5186 [CrossRef], [PubMed], [Web of Science ®] View all references, 1212... more ... Phys. Rev. Lett , 85: 5186 [CrossRef], [PubMed], [Web of Science ®] View all references, 1212. Corio, P., Santos, PS, Pimenta, MA and Dresselhaus, MS 2002. Chem. Phys. Lett. ... Corio, P., Santos, PS, Pimenta, MA and Dresselhaus, MS 2002. Chem. Phys. Lett. , 360: 557–564. ...
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 2008
Ion implantation is a process in which ions are accelerated toward a substrate at energies high e... more Ion implantation is a process in which ions are accelerated toward a substrate at energies high enough to bury them just below the surface substrate in order to modify the surface characteristics. Laser-produced plasma is a very suitable and low cost technique in the production of ion sources. In this work, a laser ion source is developed by a UV pulsed laser of about 10 8 W/cm 2 power density, employing a C target and a post ion acceleration of 40 kV to increase the ion energy. In this work, we implanted C ions on ultra-high-molecularweight-polyethylene (UHMWPE) and low-density polyethylene (LDPE). We present the preliminary results of surface property modifications for both samples. In particular, we have studied the modifications of the surface micro-hardness of the polymers by applying the ''scratch test" method as well as the hydrophilicity modifications by the contact angle measurements.
Radiation Effects and Defects in Solids, 2006
The diffusion coefficient of light gas species in polyethylene is measured through a special appa... more The diffusion coefficient of light gas species in polyethylene is measured through a special apparatus which uses a vacuum chamber and a mass quadrupole spectrometer in order to detect the diffused species. Measurements are performed in thin polyethylene films with different molecular weight, which have been irradiated in air with 5 MeV electron beams. The irradiation modifies the polyethylene-inducing cross-linking