Publicaciones 2011-2020

@article{RN404,
title = {Surface Functionalization of an Aluminum Alloy to Generate an Antibiofilm Coating Based on Poly(Methyl Methacrylate) and Silver Nanoparticles},
author = { L. Munoz and L. Tamayo and M. Gulppi and F. Rabagliati and M. Flores-Catal\'{a}n and M. Urz\'{u}a and M. Azocar and J.H. Zagal and M.V. Encinas and X.R. Zhou and G. Thompson and M. Paez},
url = {/brokenurl#<Go to ISI>://WOS:000451641900019},
doi = {10.3390/molecules23112747},
issn = {1420-3049},
year = {2018},
date = {2018-01-01},
journal = {Molecules},
volume = {23},
number = {11},
abstract = {An experimental protocol was studied to improve the adhesion of a polymeric poly(methyl methacrylate) coating that was modified with silver nanoparticles to an aluminum alloy, AA2024. The nanoparticles were incorporated into the polymeric matrix to add the property of inhibiting biofilm formation to the anticorrosive characteristics of the film, thus also making the coating antibiocorrosive. The protocol consists of functionalizing the surface through a pseudotransesterification treatment using a methyl methacrylate monomer that bonds covalently to the surface and leaves a terminal double bond that promotes and directs the polymerization reaction that takes place in the process that follows immediately after. This results in more compact and thicker poly(methyl methacrylate) (PMMA) coatings than those obtained without pseudotransesterification. The poly(methyl methacrylate) matrix modified with nanoparticles was obtained by incorporating both the nanoparticles and the methyl methacrylate in the reactor. The in situ polymerization involved combining the pretreated AA2024 specimens combined with the methyl methacrylate monomer and AgNps. The antibiofilm capacity of the coating was evaluated against P. aeruginosa, with an excellent response. Not only did the presence of bacteria decrease, but the formation of the exopolymer subunits was 99.99% lower than on the uncoated aluminum alloy or the alloy coated with unmodified poly(methyl methacrylate). As well and significantly, the potentiodynamic polarization measurements indicate that the PMMA-Ag coating has a good anticorrosive property in a 0.1-M NaCl medium.},
keywords = {aluminum antibacterial antibiofilm, bacterial coating, contact-angle, efficacy, functionalization, methacrylate), methyl-methacrylate, nanocomposites, particles, pmma, xps},
pubstate = {published},
tppubtype = {article}
}

@article{RN298,
title = {Synthesis and Photocatalytic Activity of Hybrid Layered Zno(Myristic Acid)/Ag Nanoparticles},
author = { L. Diaz and S. Devis and C. Sotomayor and G. Gonz\'{a}lez and E. Benavente},
url = {/brokenurl#<Go to ISI>://WOS:000381540100003},
doi = {10.1016/j.matlet.2016.05.126},
issn = {0167-577x},
year = {2016},
date = {2016-01-01},
journal = {Materials Letters},
volume = {181},
pages = {8-11},
publisher = {2016 Elsevier B.V.},
abstract = {A new hybrid hetero nanocomposite, consisting of ZnO(myristic acid)/Ag-NPs, has been synthesized. The nanocomposite, made up of single ZnO nanosheets sandwiched between myristic acid self-assembled monolayers was synthesized and decorated with metal nanoparticles by chemical solution and tested in the photodegradation of methylene blue under UV light irradiation. The product displayed significant photocatalytic activity for degradation of the dye, and the activity was improved by a factor of three compared to bulk ZnO under similar conditions. The observed photodegradation efficiency is discussed in terms of the confinement of the semiconductor in the two dimensional structure, the adsorption ability of the organic component and the plasmonic absorption of Ag nanoparticles, which makes them act as electron wells, thus promoting charge separation and a reduced recombination rate.},
keywords = {equilibration, fermi-level irradiation, nanocomposites, nanoflakes, nanorods, nanowires, performance, photocatalysis, semiconductors, size uv, visible-light, zno},
pubstate = {published},
tppubtype = {article}
}

@article{RN255,
title = {Crystallizing Vanadium Pentoxide Nanostructures in the Solid-State Using Modified Block Copolymer and Chitosan Complexes},
author = { C. Diaz and G. Barrera and M. Segovia and M.L. Valenzuela and M. Osiak and C. O'dwyer},
url = {/brokenurl#<Go to ISI>://WOS:000354681800001},
doi = {10.1155/2015/105157},
issn = {1687-4110},
year = {2015},
date = {2015-01-01},
journal = {Journal of Nanomaterials},
volume = {10.1155/2015/105157},
abstract = {A systematic study of the synthesis of V2O5 nanostructured materials using macromolecular PS-co-4-PVP center dot(VCl3)(y) and chitosan center dot(VCl3)(y) complexes is presented. It is demonstrated that various coordination degrees of the metal into the polymeric chain specifically influence the product formation after pyrolysis. PS-co-4-PVP center dot(VCl3)(y) and chitosan center dot(VCl3)(y) complexes were prepared by simple coordination reaction of VCl3 with the respective polymer inmolar ratios 1 : 1, 1 : 5, and 1 : 10 metal/polymer and characterized by elemental analysis, IR spectroscopy, and TGA/DSC analysis. Solid-state thermolysis of these precursors at several temperatures under air results in nanostructured V2O5 using all precursors. The size and shape of the nanostructured V2O5 depend on the nature of the polymer. For the chitosan center dot(VCl3)(y) precursors sub-10nm nanocrystals are formed. The calcination process, involved in the preparation method, produces V2O5 with photoluminescence in the visible light region, suggesting the possible application in oxygen sensing devices.},
keywords = {electrochemical gold growth, intercalation, mechanisms, nanocomposites, nanoparticles, optical-properties, photoluminescence, precursors, properties, ruthenium},
pubstate = {published},
tppubtype = {article}
}

@article{RN136,
title = {Large Directional Conductivity Change in Chemically Stable Layered Thin Films of Vanadium Oxide and a 1d Metal Complex},
author = { C. Glynn and D. Thompson and J. Paez and G. Collins and E. Benavente and V. Lavayen and N. Yutronic and J.D. Holmes and G. Gonz\'{a}lez and C. O'dwyer},
url = {/brokenurl#<Go to ISI>://WOS:000323578000011},
doi = {10.1039/c3tc31104j},
issn = {2050-7526},
year = {2013},
date = {2013-01-01},
journal = {Journal of Materials Chemistry C},
volume = {1},
number = {36},
pages = {5675-5684},
abstract = {Electroactive hybrid and layered oxides and related materials where the inorganic phase is the host, offering the conductivity characteristics of semiconductors, have been used in thin film transistors and related electronic devices where the host-guest interaction offered conductivity with improved processability. We describe the synthesis and characterization of a nanocomposite that shows large conductivity anisotropy when deposited as a thin film. We prepared the material by inserting quasi 1-dimensional potassium tetracyanoplatinate metal complexes with insulating electrical properties in between stacked nanosheets of vanadium oxide xerogels. Detailed structural and compositional analysis using transmission electron microscopy and X-ray photoelectron spectroscopy confirms that the hybrid material forms from a topotactic reaction and the framework of the layered host oxide structure is maintained. The hybrid film demonstrates a similar to 1000-fold conductivity change between transport parallel and perpendicular to the film at room temperature. Temperature dependent transport measurements confirm Ohmic conduction perpendicular to the stack and small polaron hopping conduction parallel to the layering direction of the film. The conductivity anisotropy and simple synthesis demonstrate that nanostructured layered hybrids can provide alternative materials for thin film complementary logic and resistive memory.},
keywords = {charge hybrid intercalation, low-temperature, materials, mechanism, nanocomposites, nanostructures, sol-gel, transport, v2o5},
pubstate = {published},
tppubtype = {article}
}

@article{RN79,
title = {Hybrid Laminar Organic-Inorganic Semiconducting Nanocomposites},
author = { Z. Lopez-Cabana and D. Navas and E. Benavente and M.A. Santa-Ana and V. Lavayen and G. Gonz\'{a}lez},
url = {/brokenurl#<Go to ISI>://WOS:000302299300014},
doi = {10.1080/15421406.2011.633852},
issn = {1542-1406},
year = {2012},
date = {2012-01-01},
journal = {Molecular Crystals and Liquid Crystals},
volume = {554},
pages = {119-134},
abstract = {Hybrid two-dimensional nanocomposites of transition metal semiconductors based on molybdenum disulfide, zinc oxide, and vanadium pentoxide, in which ultra-thin sheets of the inorganic component are stabilized by insertion into a bilayer of organic amphiphiles, are described. The resulting solids are commensurate species with characteristic stoichiometries, extremely high aspect ratio, and large organic-inorganic interfaces. Synthesis procedures and changes in the properties of the nanocomposites with respect to those of their components, depend on the structural nature of the pristine semiconductor. Derivatives of the laminar semiconductor MoS2 are obtained by quasi-topotactic intercalation of amphiphiles into the layered inorganic matrix, being changes in the properties mainly associated to guest-host charge transfer without altering significantly the electronic structure of the sulfide. In the case of the structurally isotropic ZnO bottom-up sol-gel synthesis procedures, it is necessary to use amphiphiles as templates, producing the two dimensional confinement with significant changes in the band gap of the semiconductor. Vanadium oxide, because of bonding asymmetry, may be easily intercalated. However due to its low laying conduction band, this leads to mixed valence species. Beyond size and dimension induced bang-gap changes, the optical properties of the products, as appreciated in their absorption and emission spectra, are in general qualitatively similar to those of pristine semiconductors.},
keywords = {nanocomposites, semiconductors, v2o5, zno},
pubstate = {published},
tppubtype = {article}
}

@article{RN89,
title = {Layered Graphitic Carbon Host Formation During Liquid-Free Solid State Growth of Metal Pyrophosphates},
author = { C. Diaz and M.L. Valenzuela and V. Lavayen and C. O'dwyer},
url = {/brokenurl#<Go to ISI>://WOS:000304728500029},
doi = {10.1021/ic300767h},
issn = {0020-1669},
year = {2012},
date = {2012-01-01},
journal = {Inorganic Chemistry},
volume = {51},
number = {11},
pages = {6228-6236},
abstract = {We report a successful ligand- and liquid-free solid state route to form metal pyrophosphates within a layered graphitic carbon matrix through a single step approach involving pyrolysis of previously synthesized organometallic derivatives of a cyclotriphosphazene. In this case, we show how single crystal Mn2P2O7 can be formed on either the micro- or the nanoscale in the complete absence of solvents or solutions by an efficient combustion process using rationally designed macromolecular trimer precursors, and present evidence and a mechanism for layered graphite host formation. Using in situ Raman spectroscopy, infrared spectroscopy, X-ray diffraction, high resolution electron microscopy, thermogravimetric and differential scanning calorimetric analysis, and near-edge X-ray absorption fine structure examination, we monitor the formation process of a layered, graphitic carbon in the matrix. The identification of thermally and electrically conductive graphitic carbon host formation is important for the further development of this general ligand-free synthetic approach for inorganic nanocrystal growth in the solid state, and can be extended to form a range of transition metals pyrophosphates. For important energy storage applications, the method gives the ability to form oxide and (pyro)phosphates within a conductive, intercalation possible, graphitic carbon as host-guest composites directly on substrates for high rate Li-ion battery and emerging alternative positive electrode materials.},
keywords = {characterization, nanocomposites, nanoparticles, nanotubes, nanowires precursor, pyrolysis, spectroscopic},
pubstate = {published},
tppubtype = {article}
}

@article{RN90,
title = {Intercalation and Electrical Behavior of Taxmo1-Xs2 (X > 0.5) Layered Mixed Disulfides},
author = { N. Lara and P. Aranda and A.I. Ruiz and V. Manriquez and E. Ruiz-Hitzky},
url = {/brokenurl#<Go to ISI>://WOS:000302461200007},
doi = {10.1590/S0103-50532012000300007},
issn = {0103-5053},
year = {2012},
date = {2012-01-01},
journal = {Journal of the Brazilian Chemical Society},
volume = {23},
number = {3},
pages = {415-+},
abstract = {This work reports a systematic study of the structural and electrical behavior of three ternary phases of the TaxMo1-xS2 system (x = 0.55, 0.75 and 0.90) and their intercalation compounds resulting from both chemical and electrochemical lithium insertions, as well as from pyridine and poly(ethylene oxide) intercalations. The three ternary phases were prepared by direct reaction of their constituting elements, without any other additive, at 900 degrees C in inert atmosphere. The resulting compounds were characterized by means of X-ray powder diffractometry (XRD), thermogravimetric and differential thermal (TGA/DTA) analyses, energy dispersive X-ray fluorescence (EDX) and field emission-scanning electron microscopy (FE-SEM). The electrical conductivity of the different products was measured in the 1.5-300 K temperature range using the conventional four probe van der Pauw method in the presence of a 9 T magnetic field in order to verify the occurrence of magnetoresistivity phenomena.},
keywords = {chalcogenides, complexes, conducting conductivity, dichalcogenides, encapsulation, intercalation, lithium molybdenum-disulfide, mos2, nanocomposites, peo, polymers, pyridine, solids sulfides, transition-metal},
pubstate = {published},
tppubtype = {article}
}