Oscar Goiz | Instituto Politécnico Nacional (original) (raw)

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Books by Oscar Goiz

Research paper thumbnail of Algunas consideraciones sobre nanociencia verde

Papers by Oscar Goiz

Research paper thumbnail of Photofusion and Disaggregation of Silver Nanoparticles Suspended in Ethanol by Laser Irradiation

Current Nanoscience

Background: Metal nanoparticles have been widely investigated due to their unique optical, mechan... more Background: Metal nanoparticles have been widely investigated due to their unique optical, mechanical, and chemical properties compared with those of the same bulk material. These properties can be tuned by controlling their size or shape, in this sense, several nanomaterials have been obtained by means of both chemical and physical methods. For instance, silver nanoparticles have been obtained in liquid media by using laser ablation or chemical reduction techniques. Another way to obtain a colloidal silver nanoparticles is through the well-known pulsed laser irradiation method which can produce a stable colloidal solution in a few minutes of irradiation and without stabilizing molecules or ligands. Methods: Silver nanopowder suspended in ethanol was irradiated with a pulsed laser at 532 nm via optical fiber. Previously, the fiber was prepared by cleaving and removing its coating and then placed in the middle of a cell. The pulse width was 15 ns and the pulse repetition frequency wa...

Research paper thumbnail of Morphology of nanostructured GaP on GaAs: Synthesis by the close-spaced vapor transport technique

Chemical Physics Letters, 2007

Nanostructures of gallium phosphide (GaP) were fabricated through the close-spaced vapor transpor... more Nanostructures of gallium phosphide (GaP) were fabricated through the close-spaced vapor transport technique (CSVT). Such nanostructures were grown on crystalline gallium arsenide (GaAs) by using a GaP powder source in the absence of any catalyst. Nanostructured GaP products were structurally and morphologically characterized by means of physicochemical and spectroscopic techniques, such as SEM, EDS, XRD, and NMR. Results showed that GaP structures present a nanoflower-like morphology. Indeed, these nanoflowers are constituted by numerous nanowires. The diameters of the GaP nanowires were in the interval of 80-300 nm, with lengths varying from several to tens of micrometers.

Research paper thumbnail of Effect of trimesic acid as chelating agent in sulfided CoMoP/γ-Al2O3 catalyst for hydrodesulfurization of straight-run gas oil

Catalysis Today, 2018

Effect of trimesic acid as chelating agent in sulfided CoMoP/␥-Al2O3 catalyst for hydrodesulfuriz... more Effect of trimesic acid as chelating agent in sulfided CoMoP/␥-Al2O3 catalyst for hydrodesulfurization of straight-run gas oil, Catalysis Today

Research paper thumbnail of Effect of 2,6-Bis-(1-hydroxy-1,1-diphenyl-methyl) Pyridine as Organic Additive in Sulfide NiMoP/γ-Al₂O₃ Catalyst for Hydrodesulfurization of Straight-Run Gas Oil

Molecules (Basel, Switzerland), Jan 15, 2017

The effect of 2,6-bis-(1-hydroxy-1,1-diphenyl-methyl) pyridine (BDPHP) in the preparation of NiMo... more The effect of 2,6-bis-(1-hydroxy-1,1-diphenyl-methyl) pyridine (BDPHP) in the preparation of NiMoP/γ-Al₂O₃ catalysts have been investigated in the hydrodesulfurization (HDS) of straight-run gas oil. The γ-Al₂O₃ support was modified by surface impregnation of a solution of BDPHP to afford BDPHP/Ni molar ratios (0.5 and 1.0) in the final composition. The highest activity for NiMoP materials was found when the molar ratio of BDPHP/Ni was of 0.5. X-ray diffraction (XRD) results revealed that NiMoP (0.5) showed better dispersion of MoO₃ than the NiMoP (1.0). Fourier transform infrared spectroscopy (FT-IR) results indicated that the organic additive interacts with the γ-Al₂O₃ surface and therefore discards the presence of Mo or Ni complexes. Raman spectroscopy suggested a high Raman ratio for the NiMoP (0.5) sample. The increment of the Mo=O species is related to a major availability of Mo species in the formation of MoS₂. The temperature programmed reduction (TPR) results showed that the...

Research paper thumbnail of Algunas consideraciones sobre nanociencia verde

Research paper thumbnail of Photofusion and Disaggregation of Silver Nanoparticles Suspended in Ethanol by Laser Irradiation

Current Nanoscience

Background: Metal nanoparticles have been widely investigated due to their unique optical, mechan... more Background: Metal nanoparticles have been widely investigated due to their unique optical, mechanical, and chemical properties compared with those of the same bulk material. These properties can be tuned by controlling their size or shape, in this sense, several nanomaterials have been obtained by means of both chemical and physical methods. For instance, silver nanoparticles have been obtained in liquid media by using laser ablation or chemical reduction techniques. Another way to obtain a colloidal silver nanoparticles is through the well-known pulsed laser irradiation method which can produce a stable colloidal solution in a few minutes of irradiation and without stabilizing molecules or ligands. Methods: Silver nanopowder suspended in ethanol was irradiated with a pulsed laser at 532 nm via optical fiber. Previously, the fiber was prepared by cleaving and removing its coating and then placed in the middle of a cell. The pulse width was 15 ns and the pulse repetition frequency wa...

Research paper thumbnail of Morphology of nanostructured GaP on GaAs: Synthesis by the close-spaced vapor transport technique

Chemical Physics Letters, 2007

Nanostructures of gallium phosphide (GaP) were fabricated through the close-spaced vapor transpor... more Nanostructures of gallium phosphide (GaP) were fabricated through the close-spaced vapor transport technique (CSVT). Such nanostructures were grown on crystalline gallium arsenide (GaAs) by using a GaP powder source in the absence of any catalyst. Nanostructured GaP products were structurally and morphologically characterized by means of physicochemical and spectroscopic techniques, such as SEM, EDS, XRD, and NMR. Results showed that GaP structures present a nanoflower-like morphology. Indeed, these nanoflowers are constituted by numerous nanowires. The diameters of the GaP nanowires were in the interval of 80-300 nm, with lengths varying from several to tens of micrometers.

Research paper thumbnail of Effect of trimesic acid as chelating agent in sulfided CoMoP/γ-Al2O3 catalyst for hydrodesulfurization of straight-run gas oil

Catalysis Today, 2018

Effect of trimesic acid as chelating agent in sulfided CoMoP/␥-Al2O3 catalyst for hydrodesulfuriz... more Effect of trimesic acid as chelating agent in sulfided CoMoP/␥-Al2O3 catalyst for hydrodesulfurization of straight-run gas oil, Catalysis Today

Research paper thumbnail of Effect of 2,6-Bis-(1-hydroxy-1,1-diphenyl-methyl) Pyridine as Organic Additive in Sulfide NiMoP/γ-Al₂O₃ Catalyst for Hydrodesulfurization of Straight-Run Gas Oil

Molecules (Basel, Switzerland), Jan 15, 2017

The effect of 2,6-bis-(1-hydroxy-1,1-diphenyl-methyl) pyridine (BDPHP) in the preparation of NiMo... more The effect of 2,6-bis-(1-hydroxy-1,1-diphenyl-methyl) pyridine (BDPHP) in the preparation of NiMoP/γ-Al₂O₃ catalysts have been investigated in the hydrodesulfurization (HDS) of straight-run gas oil. The γ-Al₂O₃ support was modified by surface impregnation of a solution of BDPHP to afford BDPHP/Ni molar ratios (0.5 and 1.0) in the final composition. The highest activity for NiMoP materials was found when the molar ratio of BDPHP/Ni was of 0.5. X-ray diffraction (XRD) results revealed that NiMoP (0.5) showed better dispersion of MoO₃ than the NiMoP (1.0). Fourier transform infrared spectroscopy (FT-IR) results indicated that the organic additive interacts with the γ-Al₂O₃ surface and therefore discards the presence of Mo or Ni complexes. Raman spectroscopy suggested a high Raman ratio for the NiMoP (0.5) sample. The increment of the Mo=O species is related to a major availability of Mo species in the formation of MoS₂. The temperature programmed reduction (TPR) results showed that the...

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