Heat transport between a Liquid-Solide interface at the Nanoscale – HotLiNe
With the rapid evolution of the elaboration methods for new materials and novel nano-architectured devices during the last decade, it is nowadays possible to fabricate series of nanoporousmaterials with functionalized internal surfaces with tuneable properties for liquids. Numerous applications with technological purposes like in nanofluids or for instance where nanostructured hydrophilic and hydrophobic surfaces and recently icephilic/icephobic surfaces are important building blocks for lab on chip devices are concerned. Furthermore, since the size of Micro- and Nano-Electro Mechanical Systems (MEMS/NEMS) is continuously reducing, some tribological issues, and specifically the “stiction” due to the condensed water layer between the interacting surfaces was reported while working under ambient environment. The corresponding capillary forces could produce damages, lower the performance of MEMS/NEMS and might deteriorate their functioning.
In this context the HotLiNe project aims at producing new knowledge on heat transport between a liquid and a solid at the nanoscale for a better thermal management of nanodevices involving complex interfaces, nanoporous materials or nanoobjects in contact with a liquid. It mainly considers the two following concrete cases where liquid/solid interfaces may play a crucial role on heat dissipation: (1) various nanoporous Si (np-Si) materials with liquid (water and ethanol) filled pores, with different liquid filling densities while tuning the hydro-phobicity of pores and surfaces, (2) a liquid meniscus at the contact between a self-heated Si -based Scanning Thermal Microscopy (SThM) nanotip and Si substrates with different surface properties.
To reach its objectives the project gathers the highly complementary interdisciplinary skills of the three partners: CETHIL, LEMTA and INL who have already carried out some precursor works in its research field and its overall scientific and technological strategy is divided into three main tasks:
The Task1 “Elaboration and microstructural characterization of samples» addresses the fabrication of Si and np-Si samples with chemically modified surfaces and the characterization of their microsctructure.
The Task 2 »Modeling and simulations» deals with the development of models and numerical simulations of the elaborated systems. Molecular dynamics and Monte Carlo methods for modeling macro-microscopic systems will be used, bridging atomistic simulations and experimental measurements performed in the Task3.
The Task3 ”Thermal characterization and correlation of the computed and measured data» indeed focuses on the thermal characterization of nanohybrids np-Si-liquid and Si-liquid interfaces as a function of temperature by means of photothermal methods, Raman measurements and original experiments involving probes of SThM.
The main outputs of the project will be new knowledge on heat transport between a liquid and a solid at the nanoscale. The project will also allow a better understanding of the probe-sample interaction in SThM.
The new simulation tools developed in the project and validated by experimental results should be used to define design laws for a better thermal management of nanodevices involving complex interfaces and nanoporous materials. Concerning the technical developments, we also intent to carry on through this project new scientific knowledge to be able to suggest in the future design law for functionalized MEMS/NEMS devices.
Furthermore, we believe that our works will have a direct impact on other several applications that involve liquid/solid hybrid systems. Managing heat exchanges in such systems at nanoscale will open the way to several applications in various fields such as energy efficiency with transfer intensification in heat exchanger and processes, small-scale metrology using nanoprobes, bioengineering with drug encapsulation in nano-systems …
Monsieur Konstantinos Termentzidis (CENTRE D' ÉNERGÉTIQUE ET DE THERMIQUE DE LYON)
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.
INL INSTITUT DES NANOTECHNOLOGIES DE LYON
LEMTA Laboratoire d'énergétique et de mécanique théorique et appliquée
CETHIL CENTRE D' ÉNERGÉTIQUE ET DE THERMIQUE DE LYON
Help of the ANR 378,001 euros
Beginning and duration of the scientific project: December 2019 - 36 Months