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
Séminaire PMMH - Joe Tavacoli (München, Germany)
Programmable design and performance of modular magnetic microswimmers
Synthetic microswimmers are promising agents for targeted in-vivo healthcare as well as important frameworks from which to advance the understanding of locomotion strategies at the microscopic scale.[1,2] Nevertheless, constructing these types of devices with flexibility of design and in large numbers remains a challenge, stymieing the realization and scope of their application and the understanding and manipulation of their isolated and collective swimming strategies.[3] We take a step to meeting this challenge by using the programmed shape and arrangement of superparamagnetic modules to generate a tailored kinematic response to an external magnetic field that drives their assembly into bespoke jointed biomimetic microswimmers.
To demonstrate the capacity of this method for design innovation and production at scale, we employ it to assemble populations of four distinct swimmer architectures simultaneously. On actuation of the thus assembled swimmers with a magnetic field, we find that on an individual level their strokes can be characterized by a balance of viscous and magnetic forces, but that the magnitude of their velocities varies considerably. Linking performance to architecture, we find swimmers formed by tip-to-base connections of a series of size-graded triangular modules, locomote faster than more traditional designs comprising of a circular head and a slender tail, an enhancement we attribute to a stroke that better breaks its beating symmetry. By focusing on a flock of triangle-based swimmers we reveal four swimming couplings, thereby opening up avenues for theoretical comparison. In addition to the generation of tailored microswimmers, we envision that our flexible and robust approach to assembly will facilitate the engineering of microrobots of programmed design and functionalities drawing closer a broad range of applications at low Reynolds number.
Fig. 1 : Magnetic assembly of a jointed microswimmer from superparamagnetic modules. Scale bar is 20 microns.
References
[1] K. Bente et al, Small 14, 1-25 (2018)
[2] S. Metri et al., Physiol. Behav. 87, 052425 (2014)
[3] E. Diller, Found. Trends Robot. 2, 143–59 (2011)
Séminaires (4)
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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 - 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 (…)
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.
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