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PhD subjects

2 sujets IRAMIS

Dernière mise à jour :


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• Soft matter and complex fluids

 

Thermoelectric energy conversion in ferrolfuids for hybrid solar heat collector

SL-DRF-23-0399

Research field : Soft matter and complex fluids
Location :

Service de Physique de l’Etat Condensé (SPEC)

Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes (SPHYNX)

Saclay

Contact :

Sawako NAKAMAE

Starting date : 01-10-2021

Contact :

Sawako NAKAMAE
CEA - DRF/IRAMIS/SPEC/SPHYNX

0169087538

Thesis supervisor :

Sawako NAKAMAE
CEA - DRF/IRAMIS/SPEC/SPHYNX

0169087538

Personal web page : http://iramis.cea.fr/spec/Phocea/Pisp/index.php?nom=sawako.nakamae

Laboratory link : http://iramis.cea.fr/spec/SPHYNX/

More : https://www.magenta-h2020.eu

Thermoelectric (TE) materials that are capable of converting heat into electricity have been considered as one possible solution to recover the low-grade waste-heat (from industrial waste-stream, motor engines, household electronic appliances or body-heat).



At SPHYNX, we explore thermoelectric effects in an entirely different class of materials, namely, complex fluids containing electrically charged nanoparticles that serve as both heat and electricity carriers. Unlike in solid materials, there are several inter-dependent TE effects taking place in liquids, resulting in Se values that are generally an order of magnitude larger that the semiconductor counterparts. Furthermore, these fluids are composed of Earth-abundant raw materials, making them attractive for future TE-materials that are low-cost and environmentally friendly. While the precise origins of high Seebeck coefficients in these fluids are still debated, our recent results indicate the decisive role played by the physico-chemical nature of particle-liquid interface.



The goal of the PhD project is two-fold. First, we will investigate the underlying laws of physics behind the thermoelectric potential and power generation and other associated phenomena in a special type of complex fluids, namely, ferrofluids (magnetic nanofluids). The results will be compared to their thermos-diffusive properties to be obtained through research collaboration actions. Second, the project aims to develop proof-of-concept hybrid solar-collector devices that are capable of co-generating heat and electricity.



The proposed research project is primarily experimental, involving thermos-electrical, thermal and electrochemical measurements; implementation of automated data acquisition system and analysis of the resulting data obtained. The notions of thermodynamics, fluid physics and engineering (device) physics, as well as hands-on knowledge of experimental device manipulation are needed. Basic knowledge of optics and electrochemistry is a plus. For motivated students, numerical simulations using commercial CFD software can also be envisaged.
Therapeutical lipidic nanoassemblies in a biomimetic medium: transformation, fate and interactions

SL-DRF-23-0369

Research field : Soft matter and complex fluids
Location :

Service Nanosciences et Innovation pour les Materiaux, la Biomédecine et l’Energie (NIMBE)

Laboratoire Interdisciplinaire sur l’Organisation Nanométrique et Supramoléculaire (LIONS)

Saclay

Contact :

Frédéric GOBEAUX

Fabienne TESTARD

Starting date : 01-10-2023

Contact :

Frédéric GOBEAUX
CEA - DRF/IRAMIS/NIMBE/LIONS

01 69 08 55 21

Thesis supervisor :

Fabienne TESTARD
CEA - DRF/IRAMIS/NIMBE/LIONS

01 69 08 96 42

Personal web page : https://iramis.cea.fr/nimbe/Phocea/Pisp/index.php?nom=frederic.gobeaux

Laboratory link : https://iramis.cea.fr/Pisp/lions/index.html

More : https://www.umr-cnrs8612.universite-paris-saclay.fr/presentation_pers.php?nom=lepetre

Giving a general view of the colloidal stability of nanoparticles in a biological environment remains difficult. This comes mainly from the complexity of biological environments and the diversity of nanoparticles in terms of size distribution, shape, nature of external surface and nanostructure. In particular, the number of physico-chemical studies on “soft” organic particles obtained by self-assembly of bioconjugates remains low. To understand how the physico-chemical characteristics of "soft" nanoparticles direct their interactions with blood proteins, we propose, in collaboration with the Institut Galien, to study a concrete case where the nanostructure and the surface charge of the nanoparticles give different pharmacologically efficiency (analgesic). The objective is to study in detail how nanoparticles formed by self-assembly of bioconjugates interact with a model biological medium, taking into account both the main components (albumin, hemoglobin and lipoproteins) and the hydrodynamic flow from the circulation blood.

 

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