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Reference : UMR5258-JEAGIM-008
Workplace : PESSAC
Date of publication : Thursday, May 09, 2019
Scientific Responsible name : Yaocihuatl Medina-Gonzalez
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2019
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
"In situ measurements of the microviscosity in complex systems by using molecular rotors"
The topic of the thesis proposes an innovative strategy to develop a cost-effective microfluidics device capable to measure and map the microviscosities of complex fluids by using molecular rotors.
The strategy presented here will be applied to microfluidic processes with the aim to develop low-cost “lab on a chip” devices or sensors.
Micro rheology is a field in which the study of viscoelasticity of materials serves to consider how their dynamic behavior changes with length scale.
Applied to complex fluids, this field is of extreme industrial importance: from paints to foods, from oil recovery to processing of plastics, understanding the flow of complex fluids is essential to a wide range of technologies. The microrheology of complex systems still faces significant challenges:
1) in situ measurements within confined systems;
2) on line measurements in dynamic microsystems, and
3) viscosity mapping at the nanoscale.
Microrheology is closely connected to the field of microfluidics, which considers phenomena such as those involved in ink jet printing, 3D printing, microelectrophoresis on a chip, microvalves and the kinetics of protein crystallization. The overlap is thus quite strong and the fluid mechanics of materials in confined geometries is a common area to the two research fields. The dynamics and the microrheological behavior of confined fluids often change dramatically when, for instance, they are confined near a surface. The interfacial characteristics of gas, liquid and solid interfaces all require individually optimized methods for the measurement of the surface microrheology.
Constraints and risks
This thesis work will be developed in collaboration with the Chemical
Engineering Laboratory (LGC) at Toulouse, France. Some experiments are
planned to be held at the LGC so the successful candidate will spend some time in Toulouse during his PhD.
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