ESPCI web site
Le séminaire hebdomadaire du laboratoire PMMH a lieu tous les vendredis à 11h, au premier étage Barre Cassan, campus Jussieu (plan).
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Post-doctoral position : Design and mechanical assessment of microfluidically-generated poroelastic microgel particles
ESPCI Paris is a major institution of higher education (a French "Grande École d'ingénieurs"), an internationally renowned research center (17 laboratories), and a fertile ground of innovation for industry.
Using photo-lithography on demand and in situ on microfluidic chips became a breeding ground for high-throughput production of novel, confined gel structures in recent years.
Several examples include mono- or poly-disperse collections of soft discs, high-aspect-ratio rods and long ribbon-like structures.
These structures have been implicated in model 2D granular packings, novel and microscale flow-rate measuring protocols, and self-assembled units for next-generation materials.
Such microfluidic objects are often created using a photochemistry popularized by Doyle and co-workers, based on poly(ethylene glycol)-diacrylate and an appropriate photoinitiator. Interestingly, the structures' mechanical properties can be tuned through a variation in crosslinking density, dilution or photoreticulation dosage.
Properly assessing the mechanical properties of these microscopic objects as a function of their size and environment remains a challenge, even while such properties control their response to micromechanical solicitation. Indeed, the challenge lies in the fact that their typical dimensions are micrometric, preventing the use of classical rheometry, for example.
Recently, some microfluidic techniques were developed respecting the constraints due to the microscopic particle size. These techniques are used to investigate elastic properties at long times only, and partially lack validation
against direct mechanical testing.
Furthermore, the materials produced may in fact be poro-elastic, displaying characteristic relaxation times and complex behavior under time dependent solicitation. The development of novel particulate model systems, well controlled micro-actuators or flexible hydrogel microchannels is hindered by the lack of a full characterization and control of the mechanical hydrogel properties.
The aim of our project is thus to fill this gap and to provide detailed mechanical characterization of these promising materials, combining direct measurements using atomic force microscopy (AFM) and indirect, on-chip optical characterization with spatio-temporal resolution.
This postdoctoral project is a collaboration between two ESPCI researchers whose expertise in : near-surface polymer physics, elastohydrodynamics and near-surface microscopy (JDM) ; and complex fluids, rheology, active fluids, suspension flow and microparticle fabrication (AL) ; are highly complementary.
The work will take place in the Gulliver and PMMH labs and in the Pierre-Gilles de Gennes Institute for Microfluidics, in the heart of Paris.
Recent or upcoming PhD graduates with high motivation and experience in some of the following topics are strongly encouraged to apply : soft condensed matter, hydrodynamics, self-assembly, atomic force microscopy and microfluidics.
For the application, we request a short motivation letter along with CV to 
.
and 
or 
12-month (renewable) post-doctoral position
Start date : 01/2024
- Archives des anciens séminaires
- Séminaires récents
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Séminaires récents (7)
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Séminaire PMMH - Vince Craig, Australian National University, Australia
Vendredi 11 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Underscreening Stable colloidal systems at very high electrolyte concentrations
In colloidal systems the range and strength of electrostatic interactions has a profound effect on a range of properties including the stability of colloidal dispersions and the phase behaviour of surfactant and polymer systems. The Debye length has proven to be a very effective measure of the range of (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…) -
Séminaire PMMH – Daegyoum Kim (KAIST)
Vendredi 27 juin de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH – Daniel Tam (TU Delft)
Vendredi 13 juin de 11h00 à 12h00 - Salle réunion PMMH 1
Instructions générales pour les conférenciers
Le public du séminaire est très hétérogène (rien qu’au PMMH nous travaillons sur des thématiques très diverses, mécanique des fluides, des milieux granulaires, des solides, physique statistique, physique du mouillage, micro-fluidique, biophysique,...) l’objectif est donc de ne pas faire un séminaire trop spécialiste : au moins la première moitié du séminaire à un niveau accessible pour celui qui ne connaît rien sur le sujet.
Le séminaire a lieu à 11h. rendez-vous 15 minutes avant pour installer et tester la projection.
Le séminaire dure environ 45 minutes pour laisser un peu de temps pour discuter à la fin.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
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