We used the high-resolution Inelastic X-ray Scattering beamline of the Advanced Photon Source at Argonne National Laboratory to measure the terahertz spectrum of pure water and a dilute aqueous suspension of 15 nm diameter spherical Au nanoparticles (Au-NPs). We observe that, despite their sparse volume concentration of about 0.5%, the immersed NPs strongly influence the collective molecular dynamics of the hosting liquid. We investigate this effect through a Bayesian inference analysis of the spectral lineshape, which elucidates how terahertz transport properties of water change upon Au-NP immersion. In particular, we observe a nearly complete disappearance of the longitudinal acoustic mode and a mildly decreased ability to support shear wave propagation.
The terahertz dynamics of an aqueous nanoparticle suspension: An inelastic x-ray scattering study / De Francesco A.; Scaccia L.; Formisano F.; Guarini E.; Bafile U.; Maccarini M.; Alatas A.; Cai Y.Q.; Cunsolo A.. - In: NANOMATERIALS. - ISSN 2079-4991. - STAMPA. - 10:(2020), pp. 860-873. [10.3390/nano10050860]
The terahertz dynamics of an aqueous nanoparticle suspension: An inelastic x-ray scattering study
Guarini E.Writing – Review & Editing
;
2020
Abstract
We used the high-resolution Inelastic X-ray Scattering beamline of the Advanced Photon Source at Argonne National Laboratory to measure the terahertz spectrum of pure water and a dilute aqueous suspension of 15 nm diameter spherical Au nanoparticles (Au-NPs). We observe that, despite their sparse volume concentration of about 0.5%, the immersed NPs strongly influence the collective molecular dynamics of the hosting liquid. We investigate this effect through a Bayesian inference analysis of the spectral lineshape, which elucidates how terahertz transport properties of water change upon Au-NP immersion. In particular, we observe a nearly complete disappearance of the longitudinal acoustic mode and a mildly decreased ability to support shear wave propagation.File | Dimensione | Formato | |
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