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Sub-THz Vibrational Dynamics in Ordered Mesoporous Silica Nanoparticles. 2023

Eduardo Hernando Abad, and Frédéric Bouyer, and Laroussi Chaabane, and Alan Zerrouki, and Jérémie Margueritat, and Lucien Saviot
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche Comté, 21000 Dijon, France.

The vibrational dynamics in the sub-THz range of mesoporous silica nanoparticles (MSNs) having ordered cylindrical mesopores was investigated. MCM-41 and SBA-15 particles were synthesized, and their structure was determined using scanning electron microscopy (SEM), low-angle X-ray diffraction (XRD), N2 physisorption analyses, and Raman scattering. Brillouin scattering measurements are reported and enabled determining the stiffness of the silica walls (speed of sound) using finite element calculations for the ordered mesoporous structure. The relevance of this approach is discussed based on the comparison between the numerical and experimental results and previous works reported in the literature.

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