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23 results on '"Lagomarsini, Clara"'

1. Poroelastic longitudinal wave equation for soft living tissues

Author

Chiarelli, Piero, Vinci, Bruna, Lanatá, Antonio, Lagomarsini, Clara, and Chiarelli, Simone

Subjects
Condensed Matter - Soft Condensed Matter, Physics - Biological Physics
Abstract

Making use of the poroelastic theory for hydrated polymeric matrices, the ultrasound (US) propagation in a gel medium filled by spherical cells is studied . The model describes the connection between the poroelastic structure of living means and the propagation behavior of the acoustic waves. The equation of fast compressional wave, its phase velocity and its attenuation as a function of the elasticity, porosity and concentration of the cells into the gel external matrix are investigated. The outcomes of the theory agree with the measurements done on PVA gel scaffolds inseminated by porcine liver cells at various concentrations. The model is promising in the quantitative non-invasive estimation of parameters that could asses the change in the tissue structure, composition and architecture., Comment: This paper has been withdrawn by the author because incomplete

Published
2012

6. Contribution to the design of soft hybrid generators : combination of electroactive materials

Author

Lagomarsini, Clara, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Grenoble Alpes, Alain Sylvestre, and STAR, ABES

Subjects
Energy harvesting, Piezoelectric materials, Electroactive polymers, Polymères électroactifs, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Materiaux piézoélectriques, Human kinetic energy, [SPI.AUTO]Engineering Sciences [physics]/Automatic, Énergie cinétique humaine, [SPI.AUTO] Engineering Sciences [physics]/Automatic, Hybrid generator, Électrets, Générateur hybride, Electrets, [SPI.NRJ] Engineering Sciences [physics]/Electric power, Récupération d'énergie
Abstract

Over the last years, wearable sensors have gained in accuracy and precision, while following the demands of miniaturization and lower power consumption. Scavenging human kinetic energy to produce electricity is an attractive alternative for the power supply of these low-power-consumption devices. E-textiles for health-monitoring or biomedical implants are some of the possible applications that could benefit from a self-powering system.In this context, in 2013, a first prototype of soft and autonomous energy scavenger was developed by our research group through the collaboration between LaMCoS and G2Elab laboratories. This electrostatic generator was based on the dielectric elastomers generators (DEGs) technology, which relies on the mechanical deformation of a thin layer of dielectric material (acrylic or silicone) sandwiched between two compliant electrodes. The main advantages of this technology are their low-cost, compliance, light-weight and adaptability to complex shapes. In addition, they can work on a large scale of temperatures and frequencies (, Ces dernières années, les capteurs embarqués ont gagné en précision, fiabilité et robustesse, tout en se miniaturisant. Ces capteurs sont largement utilisés dans le domaine médical et sportif pour récolter toutes sortes de données physiologiques. Développer des générateurs d’énergie qui convertissent l’énergie mécanique ambiante en électricité constitue une voie très intéressante afin de rendre ces capteurs autonomes.Dans ce contexte, en 2013, un premier générateur souple autonome d’énergie a été développé au sein de notre équipe au G2Elab en collaboration avec le laboratoire LaMCoS. Ce générateur est conçu à partir d’élastomères électroactifs, basés sur la déformation de matériaux souples (polyacrylates, silicones) incorporés entre deux électrodes déformables et fonctionnent suivant un mode électrostatique. Ces structures présentent l’avantage d’être légères, peu chères, souples et elles peuvent être fabriquées suivant des géométries complexes. De plus, elles fonctionnent dans des gammes de fréquence basses (

Published
2018

7. Générateur électrostatique embarqué à électret parylène et polymère électro-actif

Author

Lagomarsini, Clara, Jean-Mistral, Claire, Monfray, Stephane, Sylvestre, Alain, Sciencesconf.org, CCSD, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), STMicroelectronics, and Université de Lorraine [UL]

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, Matériaux actifs, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience; Dans ce travail, nous présentons un prototype de générateur électrostatique souple pouvant être incorporé au niveau du genou pour produire de l'énergie lors de la marche ou de la course à pied. Ce générateur, complètement autonome, s'appuie sur l'incorporation d'un électret qui joue le rôle de réservoir de charges et d'un polymère électroactif de type silicone. L'originalité vient du matériau électret constitué d'un polymère de la famille des parylènes fluorés et de la géométrie du dispositif permettant à la fois d'optimiser les performances mécaniques et électriques de la structure.

Published
2018

8. Post-annealing effect on the parylene C electret thermal stability

Author

Kachroudi, Achraf, Lagomarsini, Clara, Sylvestre, Alain, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Garcia, Sylvie

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, ComputingMilieux_MISCELLANEOUS, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience

Published
2017

9. Alternatives to external polarization source for dielectric elastomer generators: electrets versus piezoelectric materials

Author

Lagomarsini, Clara, Lombardi, Giulia, Jean-Mistral, Claire, Sylvestre, Alain, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Dept. Of Electrical, Electronic And Information Engineering, University Of Bologna, University of Bologna, Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power
Abstract

International audience; Among the different technologies for kinetic energy harvesting, dielectric elastomers generators (DEGs) may represent a promising solution for supplying power to wearable low power consumption sensors and devices. These electrostatic generators provide a low-cost and lightweight solution to harvest high electrical energy densities from the mechanical deformation of an elastomeric membrane. The main disadvantage of these structures is the need of an external high voltage supply to perform the energetic cycle. In order to overcome this limitation and have a completely autonomous energy scavenger, our research group has been working since 2012, on coupling dielectric elastomers with electret materials (i.e. insulator materials that can hold a permanent electric charge over a long period of time). In the present work, a new hybrid solution for wearable energy harvesters based on DEG will be presented. This new autonomous device is based on the combination of a DEG with a piezoelectric material, which is used as new polarization source for the DEG energetic cycle. The working principle and the first results obtained on this new prototype are presented and a comparison between the two polarization solutions (electret and piezoelectric materials) is discussed.

Published
2017

10. Towards an autonomous electrostatic generator for micropower vibration energy harvesting under inertial load

Author

Kachroudi, Achraf, Lagomarsini, Clara, Basrour, Skandar, Jean-Mistral, Claire, Sylvestre, Alain, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Techniques de l'Informatique et de la Microélectronique pour l'Architecture des systèmes intégrés (TIMA), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Techniques of Informatics and Microelectronics for integrated systems Architecture (TIMA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), and Garcia, Sylvie

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, ComputingMilieux_MISCELLANEOUS, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

National audience

Published
2017

12. Outstanding performance of parylene polymers as electrets for energy harvesting and high‐temperature applications.

Author

Lagomarsini, Clara, Jean‐Mistral, Claire, Kachroudi, Achraf, Monfray, Stéphane, and Sylvestre, Alain

Subjects
ENERGY harvesting, FLUOROPOLYMERS, ELECTRETS, POLYMERS, THERMAL stability
Abstract

Parylene C is used in many applications due to its high properties but it remains a material with moderate performance as long as it is intended for use as an electret. Hence, the generally accepted idea, rightly so, in the scientific and industrial community not to necessarily select parylene (i.e., parylene C) for applications where the endurance of the electret is a strong criterion. Our study provided a new perspective on the performance of parylenes as electret. In this case, we will talk about fluorinated Parylenes of the VT‐4 type and especially AF‐4 variant. Their thermal stability is outstanding and a charge stability is almost total up to 100 °C. A 50% reduction in the charge is recorded at a temperature as high as of 220 °C (9 μm thick Parylene AF‐4), making it one of the most efficient polymer electrets to date. Negatively and positively charged Parylene AF‐4 electrets presented similar performance over long durations, which is out of ordinary for the commonly employed polymeric electrets. Finally, these fluorinated polymers are therefore particularly promising new candidates for applications in electret‐based converters for energy harvesting. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48790. [ABSTRACT FROM AUTHOR]

Published
2020
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14. Harvesting human kinetic energy by electret-based soft generators

Author

Lagomarsini, Clara, Jean-Mistral, Claire, Monfray, Stephane, Sylvestre, Alain, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), STMicroelectronics [Crolles] (ST-CROLLES), and Garcia, Sylvie

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, ComputingMilieux_MISCELLANEOUS, [SPI.NRJ] Engineering Sciences [physics]/Electric power
Abstract

International audience

Published
2016

15. Scavenging human kinetic energy while walking by electret-based energy harvester

Author

Lagomarsini, Clara, Jean-Mistral, Claire, Monfray, Stéphane, Sylvestre, Alain, Laboratoire de Génie Electrique de Grenoble (G2ELab), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Dynamique et Contrôle des Structures (DCS), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), STMicroelectronics [Crolles] (ST-CROLLES), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2016

17. Contribution to the design of soft hybrid generators: combination of electroactive polymers

Author

Lagomarsini, Clara, Sylvestre, Alain, Jean-Mistral, Claire, Monfray, Stephane, Laboratoire de Génie Electrique de Grenoble (G2ELab), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and STMicroelectronics [Crolles] (ST-CROLLES)

Subjects
[SPI.NRJ]Engineering Sciences [physics]/Electric power, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

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