Publicaciones 2011-2020

@article{RN409,
title = {Er-Doped Nanostructured Batio3 for Nir to Visible Upconversion},
author = { A. Meneses-Franco and M. Campos-Vallette and S.O. Vasquez and E.A. Soto-Bustamante},
url = {/brokenurl#<Go to ISI>://WOS:000448658400164},
doi = {10.3390/ma11101950},
issn = {1996-1944},
year = {2018},
date = {2018-01-01},
journal = {Materials},
volume = {11},
number = {10},
abstract = {Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO3 lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and 5%, with Ba/Ti ratios of 1.008 and 0.993. The stoichiometry of Ba and Ti concentrations in the lattice influenced the doping mechanism and placement of erbium ions in the lattice structure. Our research shows the existence of a strong correlation between Ba/Ti ratios, erbium concentration, phase structure and doping site location on the upconversion photoluminescence mechanisms. Competing upconversion emissions H-2(11/2)/(S3/2I15/2)-S-4-I-4 at 523 and 548 nm respectively and other photoluminescent mechanisms as (I9/2I11/2)-I-4-I-4 around 4000 nm (2500 cm(-1)) were studied using Raman and emission spectroscopy. The upconversion process is predominant over other photoluminescent decay when the material presents high distortion in the surrounding activator.},
keywords = {barium crystal, dielectric-properties, erbium, fabrication, ions microstructure, nanoparticle, nanoparticles, nanotechnology, particles, photoluminescent, spectra, technology, titanate, upconversion},
pubstate = {published},
tppubtype = {article}
}

@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{RN248,
title = {Cyclodextrin Inclusion Compound Crystals for Growth of Cu-Au Core-Shell Nanoparticles},
author = { N. Silva and E. Arellano and C. Castro and N. Yutronic and E. Lang and B. Chornik and P. Jara},
url = {/brokenurl#<Go to ISI>://WOS:000357572400020},
doi = {10.1007/s10847-015-0531-x},
issn = {1388-3127},
year = {2015},
date = {2015-01-01},
journal = {Journal of Inclusion Phenomena and Macrocyclic Chemistry},
volume = {82},
number = {3-4},
pages = {497-504},
abstract = {The preparation and structural elucidation of the 2 alpha-cyclodextrin/decylamine inclusion compound (IC) by proton nuclear magnetic resonance, rotating frame overhauser effect spectroscopy and powder X-ray diffraction have been achieved. The IC microcrystals were used as a support for the preparation of Au-Cu core-shell nanoparticles by the sputtering method. The coating of copper nanoparticles with gold was verified through anodic stripping voltammetry. The presence of metallic copper and the absence of copper oxides were determined by X-ray photoelectron spectroscopy. These results show that the formation of core-shell Cu-Au by sputtering is an effective approach to prevent the oxidation of Cu particles, leading to potential applications in nanoelectronics.},
keywords = {alpha-cyclodextrin, complexes compound, copper core-shell decylamine, fabrication, gold inclusion nanoparticles, optical-properties, oxide, particles, phase-transfer, scattering},
pubstate = {published},
tppubtype = {article}
}

@article{RN158,
title = {Estimating the Uncertainty in the Atmospheric Ammonia Concentration in an Urban Area by Ogawa Passive Samplers},
author = { M.A. Leiva and B. Gonz\'{a}lez and D. Vargas and R. Toro and R.G.E. Morales},
url = {/brokenurl#<Go to ISI>://WOS:000326851200050},
doi = {10.1016/j.microc.2013.05.004},
issn = {0026-265x},
year = {2013},
date = {2013-01-01},
journal = {Microchemical Journal},
volume = {110},
pages = {340-349},
publisher = {2013 Elsevier B.V.},
abstract = {Ammonia, one of the ambient gasses that require environmental monitoring, is typically measured using a passive sampling method. The present work presents an evaluation of the uncertainty according to the Guide to the Expression of Uncertainty in Measurement for the measurement of the atmospheric ammonia concentration as determined by an Ogawa passive sampler, using a colorimetric method. The analytical results report the uncertainty only as a standard deviation of repeated measurements, but not all sources of uncertainty are considered. In this work, the major sources of uncertainty in the measurements are identified as contributions to the linear least-square regression lines, repeatability and recovery. The result, including the expanded uncertainty (k = 2) at a level of confidence of 95%, is 39.2%. The aforementioned results indicate that the Ogawa sampler can be successfully deployed to estimate the atmospheric NH3 and could find wide application in environmental monitoring. However, to obtain correct conclusions, the uncertainty in the measurements must be considered.},
keywords = {air, ambient ammonia atmospheric canada, concentration, environment, environmental chemistry, estimation, gum, nh3 ogawa ontario, particles, passive sampler, southern uncertainty},
pubstate = {published},
tppubtype = {article}
}

@article{RN81,
title = {Ordered Arrangements of Metal Nanoparticles on Alpha-Cyclodextrin Inclusion Complexes by Magnetron Sputtering},
author = { L. Barrientos-Poblete and P. Allende-Gonz\'{a}lez and C. Orellana and P. Jara},
url = {/brokenurl#<Go to ISI>://WOS:000300180100050},
doi = {10.1016/j.ica.2011.10.032},
issn = {0020-1693},
year = {2012},
date = {2012-01-01},
journal = {Inorganica Chimica Acta},
volume = {380},
pages = {372-377},
publisher = {2011 Elsevier B.V.},
abstract = {An ordered self-assembly of copper, silver and gold nanoparticles onto crystal faces of alpha-cyclodextrin/1-octanethiol and 2 alpha-cyclodextrin/1-octylamine inclusion complexes by means of physical vapor deposition (magnetron sputtering) has been achieved. The preferential deposition on the (001) plane of the supramolecular crystal occurs because the -SH and -NH2 groups from the guest molecules found within the alpha-cyclodextrin protrude into that plane. These functional groups form a two-dimensional hexagonal lattice that interacts with the metal nanoparticles, arranging them in an ordered way.},
keywords = {catalysis, colloids, gold guest host interaction, magnetron metal metal-guest molecules, monolayer, nanoparticles, nanostructures, particles, size, sputtering, stabilization, supramolecular surface},
pubstate = {published},
tppubtype = {article}
}