Blanc SIMI 9 - Blanc - SIMI 9 - Sciences de l'Ingénierie, Matériaux, Procédés, Energie

Picosecond Laser Ultrasonics for Shear Diagnostics of Interfacial Liquids at nanoscale – PLUSDIL

Submission summary

Although the knowledge of liquid structuring/ordering is of paramount importance for such fundamental issues as energy/heat and molecules/particles transport across the interfaces, and to such fast developing applications as nanofludics, our knowledge on liquid structuring at nanoscale is very limited. There exists a consensus that the structuring of liquid in the direction normal to the solid/liquid interface takes a form of layering. The thickness of an individual layer is close to the dimension of liquid molecule. However our knowledge of the parameters of the individual layers (such as their masses, rigidities, molecules distribution inside the layer) as well as of the interactions between the individual layers and between the layers and the solid is very insufficient and is sometimes contradictory. There exists even less amount of much more uncertain data on the rigidity of the interfacial liquids in response to their loading in the direction along the surface (i.e., on shear rigidity) than on the normal rigidity. The question of vibrational energy dissipation in nanostructured interfacial and confined liquids has been practically unexplored until now. Our poor understanding of fundamental physics of the interfacial and confined liquids at nanoscale is caused by the absence of sufficient number of appropriate experimental tools to give a complete picture of physical properties and dynamic response of these quasiperiodic nanostructures existing near liquid/solid interfaces.
The main goal of the project will be to get new fundamental information on the dynamic elastic and inelastic physical properties of the liquids structured/ordered near the interfaces with solids or in the channels between the solid surfaces in the frequency band from 10 GHz up to 300 GHz, which is inaccessible by such commonly applied experimental techniques as X-rays scattering, acoustic force microscopy, surface force apparatus, and others. The proposed investigations will be conducted through the development of innovative all-optical experimental methods for both generation and detection by femtosecond lasers of the shear acoustic waves in the frequency range 10 GHz – 300 GHz approaching the frequency range of recently discovered vibrational eigenmodes of water at the interface with GaN. The length of these shear elastic waves in liquids will be in the spatial range from 30 nm down to 1 nm, providing sensitivity to the structuring of liquids at nanoscale. The developed experimental tools of picosecond laser ultrasonics will provide for the first time the information on the nanoscale structuring of dynamic shear rigidity/viscosity of liquids, which are poorly known even beyond the mentioned frequency band and which are of crucial importance in the few branches of science such as rheology, tribology and nanofluidics, for example. This goal will be achieved through a) the improvement of the technique of picosecond laser ultrasonics based on shear acoustic waves, and b) development of the new methods for the generation and detection of hypersonic frequency shear acoustic waves based on the application of the laser-induced gratings and transient optical diffraction. The developed techniques will constitute the experimental tools of picosecond laser ultrasonics which could be applied in the future not only for the diagnostics of the nanostructured liquids, but also of other nanomaterials and nanostructures.

Project coordination

Vitalyi GOUSSEV (Institut Molécules et Matériaux) – vitali.goussev@univ-lemans.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IMMM Institut Molécules et Matériaux

Help of the ANR 203,424 euros
Beginning and duration of the scientific project: February 2013 - 36 Months

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