The Terahertz Dynamics of an Aqueous Nanoparticle Suspension: An Inelastic X-ray Scattering Study

被引：7

作者：

De Francesco, Alessio ^{[1
,2
]}

Scaccia, Luisa ^{[3
]}

Formisano, Ferdinando ^{[1
,2
]}

Guarini, Eleonora ^{[4
]}

Bafile, Ubaldo ^{[5
]}

Maccarini, Marco ^{[6
]}

Alatas, Ahmet ^{[7
]}

Cai, Yong Q. ^{[8
]}

Cunsolo, Alessandro ^{[8
]}

机构：

[1] CNR, Ist Officina Mat, Operat Grp Grenoble OGG, F-38042 Grenoble, France

[2] Inst Laue Langevin ILL, F-38042 Grenoble, France

[3] Univ Macerata, Dipartimento Econ & Diritto, Via Crescimbeni 20, I-62100 Macerata, Italy

[4] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy

[5] CNR, Ist Fis Appl Nello Carrara, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy

[6] Univ Grenoble Alpes, Lab TIMC, IMAG UMR 5525, CNRS, F-38000 Grenoble, France

[7] Adv Photon Source, Argonne Natl Lab, POB 5000, Upton, NY 11973 USA

[8] Brookhaven Natl Lab, Natl Synchrotron Light Source NSLS 2, POB 5000, Upton, NY 11973 USA

来源：

NANOMATERIALS | 2020年 / 10卷 / 05期

关键词：

inelastic neutron scattering; inelastic X-ray scattering; phonon propagation; nanoparticles; model choice; Bayesian inference; ACOUSTIC EXCITATIONS; COLLECTIVE EXCITATIONS; SOUND-VELOCITY; HEAVY-WATER;

D O I：

10.3390/nano10050860

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页数：13

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