Pierre-Etienne Bourban

Background 1990 Ingénieur en science des matériaux 1993 PhD in materials science Activities 1993-1994 Research at the Center for Composite Materials, University of Delaware, USA (ccm.udel.edu), SNSF grant Since 1994 Research and teaching at EPFL, Composites, (LTC, LPAC) 1995-1999 Coordination Swiss Priority Program on Materials research: 2.2: Composites Since 1998 Biocomposites 2004-2009 Direction of the EPFL Transdisciplinary programme in Sport and Rehabilitation 2005-2008 Member of the EPFL Vice-Presidency for Innovation and Valorisation and direction a.i.EPFL-LTC Since 2016 Direction Discovery Learning Labs Materials/Bioengineering and Engineering

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Unités associées (8)

Unités associées

Chargement

Cours enseignés par cette personne (6)

Cours enseignés par cette personne

Chargement

Domaines de recherche associés (92)

Domaines de recherche associés

Chargement

Publications associées (172)

Chargement

Afficher plus

Publications associées

Chargement

Personnes menant des recherches similaires (98)

Personnes menant des recherches similaires

Chargement

Ingénierie tissulaire

L'ingénierie tissulaire ou génie tissulaire (en anglais, tissue engineering) est l'ensemble des techniques faisant appel aux principes et aux méthodes de l'ingénierie, de la culture cellulaire, des sc

Acide polylactique

L'acide polylactique (polylactic acid, abrégé en PLA) est un polymère biodégradable en compostage industriel (à une température supérieure à ). Homopolymère biosourcé, le PLA peut être obtenu à par

Matériau composite

vignette|Multicouche, un exemple de matériau composite. Un matériau composite est un assemblage ou un mélange hétérogène d'au moins deux composants, non miscibles mais ayant une forte capacité d'inter

MSE-100: Materials structure

Ce cours met en relation les différents niveaux de structuration de la matière avec les propriétés mécaniques, thermiques, électriques, magnétiques et optiques des matériaux. Des travaux pratiques en laboratoire et un projet de groupe permettent d'apréhender le métier d'ingénieur en matériaux.

MSE-205: Materials mechanics

La mécanique des solides déformables est abordée pour déterminer les contraintes et déformations dans divers matériaux isotropes sollicités en traction, compression, cisaillement, torsion et flexion. Des structures de l'ingénierie et de la biologie sont traitées.

MSE-215: Mise en oeuvre des matériaux II

Introduction aux relations mise en œuvre-structures-propriétés des polymères, céramiques et métaux, fournissant les bases nécessaires à la sélection de matériaux et procédés pour la fabrication de composants en microtechnique.

Silk granular hydrogels self-reinforced with regenerated silk fibroin fibers

Pierre-Etienne Bourban, Adrien Julien Demongeot, Peyman Karami, Dominique Pioletti, Céline Samira Wyss

Granular hydrogels with high stability, strength, and toughness are laborious to develop. Post-curing is often employed to bind microgels chemically and enhance mechanical properties. Here a unique strategy was investigated to maintain microgels together with a novel self-reinforced silk granular hydrogel composed of 10 wt% 20 kDa poly(ethylene glycol) dimethacrylate microgels and regenerated silk fibroin fibers. The principle is to use the swelling of microgels to concentrate the surrounding solution and regenerate silk fibroin in situ. Self-reinforcement is subsequently one of the added functions. We showed that silk fibroin in most compositions was homogeneously distributed and had successfully regenerated in situ around microgels, holding them together in a network-like structure. FTIR analysis revealed the presence of amorphous and crystalline silk fibroin, where 50% of the secondary structures could be assigned to strong β-sheets. Swelling ratios, i.e. 10–45 vol%, increased proportionally with the microgel content, suggesting that mainly microgels governed swelling. In contrast, the elastic modulus, i.e. 58–296 kPa, increased almost linearly with silk fibroin content. Moreover, we showed that the precursor could be injected and cast into a given shape. Viscous precursors of various compositions were also placed side by side to create mechanical gradients. Finally, it was demonstrated that silk granular hydrogel could successfully be synthesized with other microgels like gelatin methacryloyl. Silk granular hydrogels represent, therefore, a novel class of self-reinforced hydrogel structures with tunable swelling and elastic properties.

2021

Chargement

Cross-linkable polymer, hydrogel, and method of preparation thereof

Pierre-Etienne Bourban, Peyman Karami, Christophe Moser, Dominique Pioletti, Céline Samira Wyss

The invention relates to a cross-linkable polymer comprising a base polymer comprising functional groups at least some of which have been reacted with a first organic molecule comprising a cross-linkable unit and with a second organic molecule capable of bonding to organic and/or inorganic substrates. The invention further relates to a hydrogel comprising the cross-linkable polymer that comprises cross-linkable polymer strands, wherein at least some of the cross-linkable units of different cross-linkable polymer strands have reacted to form a covalent bond thereby forming a covalently linked network. The invention further relates to a method for the preparation of the hydrogel and to the use of the hydrogel.

2020

Chargement

Hybrid granular hydrogels: combining composites and microgels for extended ranges of material properties

Pierre-Etienne Bourban, Peyman Karami, Dominique Pioletti, Céline Samira Wyss

Developing hydrogels with optimal properties for specific applications is challenging as most of these properties, such as toughness, stiffness, swelling or deformability, are interrelated. The improvement of one property usually comes at the cost of another. In order to decouple the interdependence between these properties and to extend the range of material properties for hydrogels, we propose a strategy that combines composite and microgel approaches. The study focuses first on tailoring the swelling performance of hydrogels while minimally affecting other properties. The underlying principle is to partially substitute some of the hydrogels with pre-swollen microgels composed of the same materials. Swelling reductions up to 45% were obtained. Those granular hydrogels were then reinforced with nano-fibrillated cellulose fibres obtaining hybrid granular materials to improve their toughness and to further reduce their initial swelling. Four different structures of neat, granular and composite hydrogels including 63 different hydrogel compositions based on 20 kDa poly(ethylene glycol)dimethacrylate showed that the swelling ratio could be tailored without significantly affecting elastic modulus and deformation performance. The results explain the role of the PEGDM precursors on the swelling of the microgels as well as the influence of the microgel and fibre contents on the final properties. Moreover, the precursors of hydrogels with similar mechanical or swelling performance were injectable with a wide range of complex viscosities from 0.1 Pa s to over 1000 Pa s offering new opportunities for applications in confined as well as in unconfined environments.

ROYAL SOC CHEMISTRY2020

Chargement

Afficher plus