Papers by Author: Perla E. García

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Authors: J.C. Ramos, A. Ledezma, Ivana Moggio, Eduardo Arias, R.A. Vazquez, Carlos A. Martínez, J.R. Torres, Ronald F. Ziolo, Perla E. García, S. Sepulveda, Miguel José-Yacamán, A. Olivas
Abstract: Bromobenzenethiol passivated gold nanoparticles were mixed with a poly(phenylene ethynylene) bearing thioester flexible sequences in order to obtain a fluorescent composite for optical biosensors. The particles and the composite were characterized by 1H, 13C NMR, UV-Vis and fluorescence spectroscopy, TEM and STEM. The particles are homogeneously dispersed in the polymer matrix as observed by electron microscopy. The NMR spectra suggest that the gold particles and the poly(phenylene ethynylene) are probably interacting through the sulfur atoms of the –C(O)S- and –CH2-S-CH2- moieties of the flexible sequences of the polymer as well as through  interactions between the aromatic ring of 4-bromobenzenthiol and the conjugated backbone of pPET3OC12-sqS. The quantum yield of the composite both in solution and in solid state films is slightly lower than that of pPET3OC12-sqS because of the quenching effect of gold. Nonetheless, a change of the fluorescence intensity of the composite films can be detected as a consequence of the contact with microorganisms. Preliminary microbiological assays indicate an antimicrobial effect of the composite film with the E. coli bacteria.
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Authors: H. de la Garza-Gutiérrez, J.P. Muñoz-Mendoza, O. Chimal-Valencia, Roberto Martínez-Sánchez, S.D. De la Torre, A. García-Luna, Perla E. García
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Authors: José Andrés Matutes-Aquino, Perla E. García, O. Ayala Valenzuela, S. García García
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Authors: Jose G. Camacho Meza, Carlos A. Martínez, Humberto Monreal Romero, Perla E. García
Abstract: In this work, cobalt ferrite nanowires were chemically synthesized using FeOOH array a template. The FeOOH nanoarray was obtained by the hydrolysis and precipitation of Fe+3, from FeCl3.4 H2O. The cobalt ion (Co+2) was added in order to make it interact with FeOOH nanorods of 20 nm of diameter and 150 nm of length. These nanorods are grouped into packages having different orientations due to the interaction with the cobalt ions. The arrays were calcinated at 700 and 800 °C to obtain cobalt ferrite nanowires with 70 nm of diameter and some micrometers of length. The morphology and the average size of the nanorods and nanowires were determined using Field Emission Scanning Electron Microscopy (FESEM). The Fourier Transform Infrared Spectroscopy (FTIR) was used to study the interaction between the nanorods and the cobalt ions. The phases of the material were identified using X-ray Diffraction.
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