Publicaciones 2011-2020

@article{RN410,
title = {Exploring the Influence of Diels-Alder Linker Length on Photothermal Molecule Release from Gold Nanorods},
author = { C. Vetterlein and R. Vasquez and K. Bolanos and G.A. Acosta and F. Guzman and F. Albericio and F. Celis and M. Campos-Vallette and M.J. Kogan and E. Araya},
url = {/brokenurl#<Go to ISI>://WOS:000432505900038},
doi = {10.1016/j.colsurfb.2018.03.021},
issn = {0927-7765},
year = {2018},
date = {2018-01-01},
journal = {Colloids and Surfaces B-Biointerfaces},
volume = {166},
pages = {323-329},
publisher = {2018 Elsevier B.V.},
abstract = {We studied the photothermal release of carboxyfluorescein (CF) linked to the gold surface of gold nanorods (GNRs) by two Diels-Alder adducts of different lengths (n = 4 and n = 9). The functionalized GNRs were irradiated with infrared light to produce photothermal release of CF by a retro-Diels-Alder reaction. The adducts were chemisorbed on the GNRs and the functionalized nanoparticles were characterized by UV-vis, DLS, zeta potential and Raman and surface-enhanced Raman spectroscopy (SEAS). On the basis of the degree of nanoparticle functionalization and the SERS results, we inferred the orientation of CF on the surface of the gold nanoparticle. Moreover, we determined the photothermal release profiles of CF from the gold surface by laser irradiation. The release was faster for the longer linker (n = 9). SERS revealed that, for the shorter linker (n = 4), molecules are oriented perpendicularly with respect to the gold surface, thereby maintaining the CF far from the surface. In contrast, the longer linker was observed to be tilted, thus maintaining CF close to the gold surface and therefore potentially favoring the photothermal transfer of energy. These results are relevant for the future development of the spatial and temporal controlled release of drugs by means of gold nanoparticles.},
keywords = {controlled drug-delivery, effect, enhanced fluorescence, micelles, nanoparticles, peptide photothermal polymeric raman-scattering, release, spatial temporal},
pubstate = {published},
tppubtype = {article}
}

@article{RN318,
title = {Fluorescence and Surface-Enhanced Vibrational Spectroscopies of Lawsone and Plumbagin},
author = { A.E. Aliaga and P. Leyton and E. Clavijo and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000405754400002},
doi = {10.1080/00387010.2016.1146772},
issn = {0038-7010},
year = {2016},
date = {2016-01-01},
journal = {Spectroscopy Letters},
volume = {49},
number = {5},
pages = {326-335},
abstract = {The natural dyes lawsone and plumbagin (1,4-naphthoquinones) were studied by using fluorescence, Raman, infrared (IR), surface-enhanced Raman scattering (SERS), and surface-enhanced IR absorption. From the absorption spectrum, it was possible to infer that the enol-lawsone tautomer concentration decreases in silver colloidal solution. Plumbagin dimers, both in water and in silver colloidal solution, were identified from the fluorescence band profile and surface-SERS spectrum. The SERS spectrum of lawsone was obtained by using silver colloidal solution after 12-hour settle; the keto and enol lawsone silver colloid interaction occurs. The assignment of Raman and IR bands of both dyes was calculated with density functional theory calculations. Only a monomeric structure of lawsone interacting with a silver cluster model was predicted. The monomer adopts a nearly coplanar orientation onto the silver surface; the shortest distance is 3.2 angstrom, suggesting an electrostatic interaction.},
keywords = {behavior, calculations, enhanced fluorescence, infrared-absorption, lawsone, nanoparticles, plumbagin, quinones raman raman-scattering, reduction, scattering, selection, sers, silver spectrum, surface theoretical},
pubstate = {published},
tppubtype = {article}
}