Développement de conducteurs moléculaires et d'oxydes métalliques nanostructurés pour l'industrie aérospatiale

2011

Author : Matthieu Souque
Release : 2011
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

Book Synopsis Développement de conducteurs moléculaires et d'oxydes métalliques nanostructurés pour l'industrie aérospatiale by : Matthieu Souque

Download or read book Développement de conducteurs moléculaires et d'oxydes métalliques nanostructurés pour l'industrie aérospatiale written by Matthieu Souque. This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: Au cours de ce travail de thèse, l'utilisation de matériaux nanostructurés a permis d'obtenir des solutions performantes pour trois applications distinctes proposées par Thales Alenia Space et le CNES. La première application visée était le développement de matériaux légers et faciles à mettre en œuvre pour contrôler l'environnement électromagnétique des boîtiers hermétiques qui contiennent l'électronique embarquée dans les satellites. L'obtention de nanoparticules du complexe à transfert de charge TTF-TCNQ qui peuvent être facilement solubilisées a permis de résoudre le problème de mise en forme des conducteurs moléculaires. Les solutions de nanoparticules permettent de déposer des films dont les permittivités réelles et imaginaires sont supérieures à 100 de 1 à 18 GHz. De tels films sont très intéressants pour le blindage électromagnétique. De plus, ces solutions peuvent être incorporées à des matrices pour obtenir des matériaux à fortes permittivités réelles et tangentes de pertes réduites qui sont intéressants pour l'absorption électromagnétique au-delà du GHz. L'objet de la seconde étude était la préparation de revêtements froids antistatiques pour les réflecteurs solaires flexibles. La synthèse directe de nanoparticules de ZnO de 3 nm dans une matrice silicone produite par la société MAP et le CNES a permis d'obtenir des propriétés optiques supérieures à celles obtenues par dispersion aux ultra-sons de poudres nanoparticulaires. En revanche, le test de certification du caractère antistatique des revêtements n'a pas pu être fait dans le cadre de cette thèse. La troisième étude consistait à évaluer en dosimétrie des dispositifs à couche sensible de nanoparticules de SnOx. Leurs sensibilités aux irradiations gammas mesurées à l'ONERA sont comparables à celles des RADFET utilisées actuellement. Des créations de paires électrons-trous et la désorption d'oxygène (conjointement à la réduction de l'oxyde d'étain) sont responsables de la diminution de résistance des capteurs.

ICREEC 2019

2020-06-10 Technology & Engineering

Author : Ahmed Belasri
Release : 2020-06-10
Genre : Technology & Engineering
Kind : eBook
Book Rating : 447/5 ( reviews)

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Book Synopsis ICREEC 2019 by : Ahmed Belasri

Download or read book ICREEC 2019 written by Ahmed Belasri. This book was released on 2020-06-10. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Flexoelectricity in Liquid Crystals

2013 Science

Author : Agnes Buka
Release : 2013
Genre : Science
Kind : eBook
Book Rating : 997/5 ( reviews)

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Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka

Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.

Nonlinear Optical Materials

1998-08-13 Business & Economics

Author : Jerome V. Moloney
Release : 1998-08-13
Genre : Business & Economics
Kind : eBook
Book Rating : 817/5 ( reviews)

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Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney

Download or read book Nonlinear Optical Materials written by Jerome V. Moloney. This book was released on 1998-08-13. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.

Encapsulations

2016-05-27 Science

Author : Alexandru Grumezescu
Release : 2016-05-27
Genre : Science
Kind : eBook
Book Rating : 784/5 ( reviews)

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Book Synopsis Encapsulations by : Alexandru Grumezescu

Download or read book Encapsulations written by Alexandru Grumezescu. This book was released on 2016-05-27. Available in PDF, EPUB and Kindle. Book excerpt: Encapsulations, a volume in the Nanotechnology in the Agri-Food Industry series,presents key elements in establishing food quality through the improvement of food flavor and aroma. The major benefits of nanoencapsulation for food ingredients include improvement in bioavailability of flavor and aroma ingredients, improvement in solubility of poor water-soluble ingredients, higher ingredient retention during production process, higher activity levels of encapsulated ingredients, improved shelf life, and controlled release of flavor and aroma. This volume discusses main nanoencapsulation processes such as spray drying, melt injection, extrusion, coacervation, and emulsification. The materials used in nanoencapsulation include lipids, proteins, carbohydrates, cellulose, gums, and food grade polymers. Applications and benefits of nanoencapsulation such as controlled release, protections, and taste masking will be explained in detail. Includes the most up-to-date information on nanoencapsulation and nanocontainer-based delivery of antimicrobials Presents nanomaterials for innovation based on scientific advancements in the field Provides control release strategies to enhance bioactivity, including methods and techniques for research and innovation Provides useful tools to improve the delivery of bioactive molecules and living cells into foods

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Développement de conducteurs moléculaires et d'oxydes métalliques nanostructurés pour l'industrie aérospatiale

ICREEC 2019

Flexoelectricity in Liquid Crystals

Nonlinear Optical Materials

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