Bibliographic citations
Alvarado, D., (2020). Efecto del campo magnético sobre tamaño y forma de nanopartículas de oro y plata sintetizadas por ablación láser en líquidos [Universidad Nacional de Trujillo]. https://hdl.handle.net/20.500.14414/21442
Alvarado, D., Efecto del campo magnético sobre tamaño y forma de nanopartículas de oro y plata sintetizadas por ablación láser en líquidos []. PE: Universidad Nacional de Trujillo; 2020. https://hdl.handle.net/20.500.14414/21442
@phdthesis{renati/1044358,
title = "Efecto del campo magnético sobre tamaño y forma de nanopartículas de oro y plata sintetizadas por ablación láser en líquidos",
author = "Alvarado Paiva, Douglas Fidel",
publisher = "Universidad Nacional de Trujillo",
year = "2020"
}
The effect of the application of an external magnetic field on the size and shape of gold and silver nanoparticles, synthesized by pulsed laser ablation in double distilled water, was investigated for laser irradiation wavelengths of 532 nm and 1064 nm. The application of the magnetic field was done in two modalities, one during the whole process of synthesis by pulsed laser ablation and in the other the external magnetic field was applied to the colloid with nanoparticles after the synthesis process. The characterization was carried out using UV-Vis Spectroscopy, Dynamic Light Scattering and Multimodal Electronic Microscopy TEM, SEM, STEM model LIVES, Delong America from PUCP. The following results were obtained for the synthesized gold nanoparticles: In the case of the laser irradiation wavelength of 532 nm; Regarding the effect of the external magnetic field after the synthesis of the gold nanoparticles, no significant changes were observed in the shape of the nanoparticles, but an increase in size due to aggregation, and a greater polydispersity of sizes; Regarding the effect of the external magnetic field during the synthesis of the gold nanoparticles, no changes were observed in the shape of the nanoparticles, but there was a decrease in their size, a lower concentration and a greater homogenization of the size compared to spherical nanoparticles. produced without the presence of magnetic field. For the wavelength of laser irradiation of 1064 nm, with regard to the effect of the external magnetic field after the synthesis of the gold nanoparticles, changes in the shape and size of the nanoparticles and with respect to the effect of the magnetic field are reported. During the synthesis of the gold nanoparticles, very small changes in size and a higher concentration of these were observed compared to the gold nanoparticles produced without the presence of a magnetic field. For the silver nanoparticles synthesized using the laser irradiation wavelength of 1064 nm during the synthesis, a decrease in size and a higher concentration of these were observed compared to the silver nanoparticles produced without the presence of a magnetic field. Therefore we conclude that it is possible to control the size of the spherical gold nanoparticles obtained with the 532 nm laser irradiation by applying the magnetic field during and after the synthesis; Furthermore, it is possible to obtain new shapes (ovoids, bars) of the gold nanoparticles using laser irradiation of 1064 nm for the synthesis and exposing said nanoparticles to a magnetic field after said synthesis, as observed in the microscopy images; Finally, we report that the main effect of the magnetic field on colloids with nanoparticles (gold and silver) during synthesis is that it increases the concentration of nanoparticles obtained by the laser ablation method in liquid media.
This item is licensed under a Creative Commons License