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 - Marco Faustini (LCMCP, Sorbonne Univ.)
Evaporation-driven processes towards photonic colloidal assemblies
Developing patterning methods to obtain periodic and ordered colloidal films could open perspectives for their utilization in fields ranging from electronics, photonics, microfluidics or dew-harvesting (1). For instance, integrating porous nanoparticles (oxides or Metal-Organic Frameworks) in periodic structures (films or spheres) enables the fabrication of photonic devices for applications in chemical sensing (2)(3) or local thermal probing (4).
In this seminar, I will describe our initiative to develop solution processing-routes to control the assembly of nanoparticles at multiple scales. First, several methods will be discussed that involve well established techniques : (i) nanoimprint lithography of sol-gel films for light trapping in solar-cells (5) ; (ii) spray-drying assisted self-assembly of colloidal photonic balls (4).
In the second part, a new patterning method based on the self-assembly of cracks will be presented. Indeed colloidal films are obtained by evaporative processes that generate cracks, a major drawback. However, in controlled conditions, drying of colloidal droplets results in the formation of parallel periodic cracks oriented by the evaporation front-line (6).
Inspired by the formation of cracks in mud, we demonstrate that cracks can be self-assembled into periodic patterns by controlling the evaporation conditions. Arrays of periodic cracks with several geometries can be obtain without defects over several square cm. In this configuration, cracks diffract lights and can be used as photonic platform for sensing (7). This “bottom-up” method was generalized to a large variety of solution-processed materials (such as oxides) and without any limitation in terms of substrate's shape or dimension. This simple approach enables direct integration of nanomaterials into patterned devices without the limitations of the conventional lithographic techniques.
(1) M. Faustini ; et al ACS Nano, 2018, 12, 3243
(2) O. Dalstein, et al Adv. Funct. Mater. 2016, 26, 81
(3) M. Faustini, Nat. Mater. 2021
(4) C. Avci, et al , Adv. Mater, 2021
(5) H-L Chen et al, Nat. Energy, 4, 761, 2019
(6) C. Allain, L. Limat, Physical Review Letters 1995, 74, 2981
(7) O. Dalstein ; et al , Angew. Chem. Int. Ed. 2017, 56, 14011
Séminaires (4)
-
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.
- 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
- Séminaires Gulliver
Lien vers séminaires café (internes, tous les jeudis)
