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{RN352,
title = {Construction of 6-Thioguanine and 6-Mercaptopurine Carriers Based on Beta Cyclodextrins and Gold Nanoparticles},
author = { R. Sierpe and M. Noyong and U. Simon and D. Aguayo and J. Huerta and M.J. Kogan and N. Yutronic},
url = {/brokenurl#<Go to ISI>://WOS:000411876200003},
doi = {10.1016/j.carbpol.2017.08.102},
issn = {0144-8617},
year = {2017},
date = {2017-01-01},
journal = {Carbohydrate Polymers},
volume = {177},
pages = {22-31},
abstract = {As a novel strategy to overcome some of the therapeutic disadvantages of 6-thioguanine (TG) and 6-mercaptopurine (MP), we propose the inclusion of these drugs in beta cyclodextrin (beta CD) to form the complexes beta CD-TG and beta CD-MP, followed by subsequent interaction with gold nanoparticles (AuNPs), generating the ternary systems: beta CD-TG-AuNPs and beta CD-MP-AuNPs. This modification increased their solubility and improved their stability, betting by a site-specific transport due to their nanometric dimensions, among other advantages., The formation of the complexes was confirmed using powder X-ray diffraction, thermogravimetric analysis and one and two-dimensional NMR. A theoretical study using DFT and molecular modelling was conducted to obtain the more stable tautomeric species of TG and MP in solution and confirm the proposed inclusion geometries. The deposition of AuNPs onto beta CD-TG and beta CD-MP via sputtering was confirmed by UV-vis spectroscopy. Subsequently, the ternary systems were characterized by TEM, FE-SEM and EDX to directly observe the deposited AuNPs and evaluate their sizes, size dispersion, and composition. Finally, the in vitro permeability of the ternary systems was studied using parallel artificial membrane permeability assay (PAMPA).},
keywords = {anisotropic antineoplastic, applications, cancer, complex, complexes, cytotoxicity delivery, dielectrics, drug drug-delivery, enhanced inclusion ionic-solutions, nanotechnology, permeability, pharmaceutical photothermal solid-state, sputtering, therapy},
pubstate = {published},
tppubtype = {article}
}

@article{RN300,
title = {In Situ Visualization of the Local Photothermal Effect Produced on Alpha-Cyclodextrin Inclusion Compound Associated with Gold Nanoparticles},
author = { N. Silva and C. Munoz and J. Diaz-Marcos and J. Samitier and N. Yutronic and M.J. Kogan and P. Jara},
url = {/brokenurl#<Go to ISI>://WOS:000373961200001},
doi = {10.1186/s11671-016-1322-z},
issn = {1556-276x},
year = {2016},
date = {2016-01-01},
journal = {Nanoscale Research Letters},
volume = {11},
pages = {1-8},
abstract = {Evidence of guest migration in alpha-cyclodextrin-octylamine (alpha-CD-OA) inclusion compound (IC) generated via plasmonic heating of gold nanoparticles (AuNPs) has been studied. In this report, we demonstrate local effects generated by laser-mediated irradiation of a sample of AuNPs covered with inclusion compounds on surface-derivatized glass under liquid conditions by atomic force microscopy (AFM). Functionalized AuNPs on the glass and covered by the ICs were monitored by recording images by AFM during 5 h of irradiation, and images showed that after irradiation, a drastic decrease in the height of the AuNPs occurred. The absorption spectrum of the irradiated sample showed a hypsochromic shift from 542 to 536 nm, evidence suggesting that much of the population of nanoparticles lost all of the parts of the overlay of ICs due to the plasmonic heat generated by the irradiation. Mass spectrometry matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) performed on a sample containing a collection of drops obtained from the surface of the functionalized glass provided evidence that the irradiation lead to disintegration of the ICs and therefore exit of the octylamine molecule (the guest) from the cyclodextrin cavity (the matrix).},
keywords = {compound, cyclodextrin gold guest heating, inclusion metal migration, monolayers, nanoparticles, nanorods, nanotechnology, optical-properties, plasmonic therapy},
pubstate = {published},
tppubtype = {article}
}