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Browsing Producción Científica by Author "Ávila Torres, Yenny"
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Item Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test(Colloids and Interfaces, 2019) Duque, Johan S.; Madrigal, Brayan M.; Riascos, Henry; Ávila Torres, YennyIn this article we report the production of metal oxide (TiFe2O4, ZnFe2O4) nanoparticles by pulsed laser ablation technique in a liquid environment. We used nanosecond Nd: YAG laser systems working at 532 nm and 1064 nm of wavelength and the energy of the laser beam was kept constant at 80 mJ. Absorbance spectra, surface plasmon resonance, optical band-gap, and nanoparticle morphology were investigated using ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Changing the wavelength of the laser for growth, nanoparticles showed shift between the absorbance and surface plasmon resonance peaks in their UV-Vis spectra, which implies that the optical properties of the colloid nanoparticles depend on laser parameters. This was confirmed with the variation of the band gap energy. Furthermore, redshift for the absorbance peak was observed for samples as-grown at 532 nm around 150 nm as a function of time preparation. Conversely, for the samples as-grown at 1064 nm there was no shift in the absorbance spectra, which could be due to agglomeration and formation of larger particles. The characterization results showed appropriate plasmonic photo-catalysts properties of the particles, hence the photoactivation of the nanoparticles was examined on antibacterial effect using colonies of Staphylococcus aureus and Escherichia coli.Item Síntesis de ligantes Imino-Amida como modelos de ligantes orgánicos asociados a actividad factor tolerante a la glucosa(Informador Técnico, 2017) Guateque, Jhon Fernando; Rojas Olave, Gustavo Adolfo; Flórez-Alamo, Marcos; Flórez-López, Edwin; Ávila Torres, YennyLa estructura molecular del Factor Tolerante a la Glucosa (FTG) ha sido asociada con un centro metálico de cromo enlazado de forma coordinada a ligantes electrodonadores como aminoácidos y ácido nicotínico. En este sentido, en este artículo se lleva a cabo la síntesis de ligantes con potenciales aplicaciones como FTG al coordinarse al centro de cromo(III). Se obtuvo un compuesto imino-enol (3) a partir de bencilamina (2) y acetoacetato de etilo (1) en metanol anhidro. Así mismo, la síntesis de una amina cuaternaria (5), derivada de diacianodiamida (4),en donde el centro metálico fungió como catalizador de una reacción de condensación y no como ácido de Lewis formando compuestos de coordinación.