SILVA GONZALEZ, NATALY ROXANA
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SILVA GONZALEZ, NATALY ROXANA
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nrsilva@udd.cl
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Scopus Author ID
35176687400

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2024 2024 2023 2023 2022 2022 2021 2021 2020 2020 2019 2019 0.0 0.0 0.5 0.5 1.0 1.0 1.5 1.5 2.0 2.0 2.5 2.5 3.0 3.0 3.5 3.5 4.0 4.0

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Controlled Release of the Anticancer Drug Cyclophosphamide from a Superparamagnetic β-Cyclodextrin Nanosponge by Local Hyperthermia Generated by an Alternating Magnetic Field

2024 , Sebastián Salazar Sandoval , Patricia Díaz-Saldívar , Ingrid Araya , Freddy Celis , Diego Cortés-Arriagada , Ana Riveros , Carlos Rojas-Romo , Carolina Jullian , SILVA GONZALEZ, NATALY ROXANA , Nicolás Yutronic , Marcelo J. Kogan , Paul Jara

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Modulation of the electrocatalytic activity of Fe phthalocyanine to carbon nanotubes: Electrochemistry of l-cysteine and l-cystine

2019 , SILVA GONZALEZ, NATALY ROXANA , C. Castro-Castillo , M.P. Oyarzún , S. Ramírez , C. Gutierrez-Ceron , J.F. Marco , J.F. Silva , J.H. Zagal

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Enhancing the electrocatalytic activity of Fe phthalocyanines for the oxygen reduction reaction by the presence of axial ligands: Pyridine-functionalized single-walled carbon nanotubes

2021 , María Paz Oyarzún , SILVA GONZALEZ, NATALY ROXANA , Diego Cortés-Arriagada , Juan Francisco Silva , Ingrid O. Ponce , Marcos Flores , Kaido Tammeveski , Daniel Bélanger , Andrea Zitolo , Frédéric Jaouen , José H. Zagal

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Synthesis and Characterization of Magnetite/Gold Core Shell Nanoparticles Stabilized with a β-Cyclodextrin Nanosponge to Develop a Magneto-Plasmonic System

2023 , Sebastián Salazar Sandoval , Daniel Santibáñez , Ana Riveros , Fabián Araneda , Tamara Bruna , SILVA GONZALEZ, NATALY ROXANA , Nicolás Yutronic , Marcelo J. Kogan , Paul Jara

Magnetite/gold core-shell nanoparticles (magnetite/gold NPs) have important optical and magnetic properties that provide potential for applications, especially biomedical ones. However, their preparation is not exempt from difficulties that might lead to unexpected or undesired structures. This work reports the synthesis and characterization of magnetite/gold NPs using tetramethylammonium hydroxide (TMAH) to promote the formation of a continuous interface between the magnetite core and the thin gold shell. The synthesized magnetite/gold NPs were characterized using transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), field emission scanning electron microscope (FE-SEM), ζ-potential, vibrating sample magnetometer (VSM), selected area electron diffraction (SAED), UV-Visible spectroscopy, and dynamic light scattering (DLS), confirming the core-shell structure of the NPs with narrow size distribution while evidencing its plasmonic and superparamagnetic properties as well. Further, the magnetite/gold NPs were associated and stabilized with a β-cyclodextrin nanosponge (β-CDNSs), obtaining a versatile magneto-plasmonic system for potential applications in the encapsulation and controlled release of drugs.

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Correlation between the concentration and morphology of copper microparticles and their biocidal effect on paper sheets

2020 , P. Contreras , A. Amenabar , V. Apablaza , MARTINEZ ARENAS, JESSICA ISABEL , R. Lavín , SILVA GONZALEZ, NATALY ROXANA

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β-Cyclodextrin Nanosponges Inclusion Compounds Associated with Silver Nanoparticles to Increase the Antimicrobial Activity of Quercetin

2023 , Sebastián Salazar Sandoval , Tamara Bruna , Francisca Maldonado-Bravo , Karen Bolaños , Sofía Adasme-Reyes , Ana Riveros , Nelson Caro , Nicolás Yutronic , SILVA GONZALEZ, NATALY ROXANA , Marcelo J. Kogan , Paul Jara

This work aimed to synthesize and characterize a nanocarrier that consisted of a ternary system, namely β-cyclodextrin-based nanosponge (NS) inclusion compounds (ICs) associated with silver nanoparticles (AgNPs) to increase the antimicrobial activity of quercetin (QRC). The nanosystem was developed to overcome the therapeutical limitations of QRC. The host–guest interaction between NSs and QRC was confirmed by field emission scanning electron microscopy (FE–SEM), X-ray powder diffraction (XRPD), thermogravimetric analysis (TGA), and proton nuclear magnetic resonance (1H–NMR). Moreover, the association of AgNPs with the NS–QRC was characterized using FE–SEM, energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), dynamic light scattering (DLS), ζ-potential, and UV–Vis. Finally, the antimicrobial activity of the novel formulations was tested, which depicted that the complexation of QRC inside the supramolecular interstices of NSs increases the inhibitory effects against Escherichia coli ATCC25922, as compared to that observed in the free QRC. In addition, at the same concentrations used to generate an antibacterial effect, the NS–QRC system with AgNPs does not affect the metabolic activity of GES–1 cells. Therefore, these results suggest that the use of NSs associated with AgNPs resulted in an efficient strategy to improve the physicochemical features of QRC.

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Fast and easy synthesis of silver, copper, and bimetallic nanoparticles on cellulose paper assisted by ultrasound

2023 , Rodrigo Araya-Hermosilla , MARTINEZ ARENAS, JESSICA ISABEL , César Zúñiga Loyola , Sara Ramírez , Sebastián Salazar , Charles S. Henry , Roberto Lavín , SILVA GONZALEZ, NATALY ROXANA

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Oxide copper nanoparticles stabilized by acrylonitrile and methyl methacrylate polar monomers through a ligand exchange reaction

2021 , Bárbara Rodríguez , Sara Ramírez , Pablo Gutiérrez , SILVA GONZALEZ, NATALY ROXANA , Isaac Díaz-Aburto , Andreina García , Iván Martínez

Abstract This research reports the synthesis of copper oxide nanoparticles (CuONP) functionalized by the polar monomers acrylonitrile (ACN) and methyl methacrylate (MMA). The synthesis was achieved by a practical exchange ligand reaction from CuONP previously stabilized by hexadecyltrimethylammonium bromide (CTAB). The replacement of CTAB by ACN or MMA produced the functionalized nanoparticles CuONP-ACN and CuONP-MMA, respectively. The functionalized nanoparticles were characterized by ultraviolet-visible spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (SEM), dynamic light scattering (DLS), Zeta potential, x-ray diffraction (XRD), high-resolution-transmission electron microscopy (HR-TEM), and selected area electron diffraction (SAED) analysis. Changes in surface plasmon resonance (SPR) band and the functional group bands observed in UV–vis and FTIR spectra confirmed the efficient replacement of CTAB by polar monomers. Moreover, CuONP-ACN and CuONP-MMA showed a negative surface charge with spherical morphology. X-ray diffraction (XRD) analysis showed that a monoclinic CuO crystal system was formed.

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Mapping experimental and theoretical reactivity descriptors of fe macrocyclic complexes deposited on graphite or on multi walled carbon nanotubes for the oxidation of thiols: Thioglycolic acid oxidation

2021 , Ricardo A. Matute , Alejandro Toro-Labbé , María P. Oyarzún , Sara Ramirez , Daniela E. Ortega , Karina Oyarce , SILVA GONZALEZ, NATALY ROXANA , José H. Zagal

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Testing Reactivity Descriptors for the Electrocatalytic Activity of OPG Hybrid Electrodes Modified with Iron Macrocyclic Complexes and MWCNTs for the Oxidation of Reduced Glutathione in Basic Medium

2019 , C. Gutiérrez-Cerón , SILVA GONZALEZ, NATALY ROXANA , I. Ponce , J. H. Zagal

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