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Behavior of au nanoparticles under pressure observed by in situ small-angle X-ray scattering

Abstract: The mechanical properties and stability of metal nanoparticle colloids under high-pressure conditions are investigated by means of optical extinction spectroscopy and small-angle X-ray scattering (SAXS), for colloidal dispersions of gold nanorods and gold nanospheres. SAXS allows us to follow in situ the structural evolution of the nanoparticles induced by pressure, regarding both nanoparticle size and shape (form factor) and their aggregation through the interparticle correlation function S(q) (structure factor). The observed behavior changes under hydrostatic and nonhydrostatic conditions are discussed in terms of liquid solidification processes yielding nanoparticle aggregation. We show that pressure-induced diffusion and aggregation of gold nanorods take place after solidification of the solvent. The effect of nanoparticle shape on the aggregation process is additionally discussed.

 Autoría: Martín-Sánchez C., Sánchez-Iglesias A., Barreda-Argüeso J.A., Polian A., Liz-Marzán L.M., Rodríguez F.,

 Fuente: ACS Nano, 2023, 17(1), 743-751

 Editorial: American Chemical Society

 Año de publicación: 2023

 Nº de páginas: 9

 Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acsnano.2c10643

 ISSN: 1936-0851,1936-086X

 Proyecto español: PID2021-127656NB-I00

 Url de la publicación: https://doi.org/10.1021/acsnano.2c10643

Autoría

CAMINO MARTIN SANCHEZ

SÁNCHEZ IGLESIA, ANA

JOSE ANTONIO BARREDA ARGÜESO

POLIAN, ALAIN

LIZ MARZÁN, LUIS M.