One-Pot Synthesis of Core–Shell Au@ m SiO 2 Nanoparticles for Photothermal Applications
Source abstract
Abstract
Gold-mesoporous silica (Au@ m SiO 2 ) core–shell nanoparticles (NPs) hold great promise for application in nanomedicine as they enable the photostimulated release of guest molecules located within their pores. In this study, we investigated the mechanism of a productive one-pot protocol for the preparation of core–shell Au@ m SiO 2 NPs. The formation of gold NPs quickly followed by the formation of a silica shell eliminates the need to isolate and strongly protect the gold cores. A thorough mechanistic analysis provides insights into the relative kinetics of gold and silica formation, which can be fine-tuned to obtain Au@ m SiO 2 smaller than 100 nm. The photothermal properties of such Au@ m SiO 2 were characterized and modeled. Under the experimental conditions typically used for cargo release experiments, the model predicts a temperature increase for a single particle of less than 1 × 10 –4 °C, demonstrating that the release is due to the collective heating of the medium by a myriad of NPs, rather than by the temperature elevation of individual NPs under irradiation. Overall, the studies developed here will enable better design and preparation of Au@ m SiO 2 particles for diverse photothermal applications.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Gold and Silver Nanoparticles Synthesis and Applications · Advanced Nanomaterials in Catalysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Instituto de Química, Física de los Materiales, Medioambiente y Energía (INQUIMAE, CONICET), DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina
Univ. Grenoble Alpes
CNRS, Grenoble INP, Institut Néel
Colegio de Ciencias Biologicas y Ambientales
Universidad San Francisco de Quito USFQ
Depto. de Física, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Campus Av. Libertad, CP 3400 Corrientes, Argentina
ICGM, Univ Montpellier
CNRS, ENSCM
Université Grenoble Alpes
CNRS, CEA, IRIG, SyMMES
Centro de Microscopías Avanzadas (CMA), Instituto de Física de Buenos Aires (IFIBA-CONICET)
Universidad de Buenos Aires
Funding
Agence Nationale de la Recherche · Secretar?a de Ciencia y T?cnica, Universidad de Buenos Aires · Consejo Nacional de Investigaciones Cient?ficas y T?cnicas · Fondo para la Investigaci?n Cient?fica y Tecnol?gica · Secretar?a General de Ciencia y T?cnica, Universidad Nacional del Nordeste
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