Добірка наукової літератури з теми "Films stimulables"
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Статті в журналах з теми "Films stimulables":
Kehler, M., U. Albrechtsson, B. Andersson, H. Lárusdóttir, A. Lundin, and H. Pettersson. "Assessment of Digital Chest Radiography Using Stimulable Phosphor." Acta Radiologica 30, no. 6 (November 1989): 581–86. http://dx.doi.org/10.1177/028418518903000603.
Pettersson, H., P. Aspelin, E. Boijsen, K. Herrlin, and N. Egund. "Digital Radiography of the Spine, Large Bones and Joints Using Stimulable Phosphor." Acta Radiologica 29, no. 3 (May 1988): 267–71. http://dx.doi.org/10.1177/028418518802900302.
Wu, Jianping, David Newman, and Ian Viney. "The effect of post-thermal annealing on photo- and infrared-stimulable CaS : Eu,Sm thin films." Journal of Physics D: Applied Physics 37, no. 9 (April 15, 2004): 1371–75. http://dx.doi.org/10.1088/0022-3727/37/9/011.
Revay, R., J. Schneir, D. Brower, J. Villarrubia, J. Fu, J. Cline, T. J. Hsieh, and W. Wong-Ng. "A Study of the Surface Texture of Polycrystalline Phosphor Films Using Atomic Force Microscopy." MRS Proceedings 343 (1994). http://dx.doi.org/10.1557/proc-343-119.
Zhang, Li, Haiting Wang, Bin Zheng, Huiling Du, and Anniina Salonen. "Surfactant Crystals as Stimulable Foam Stabilizers: Tuning Stability with Counterions." Journal of Surfactants and Detergents, July 29, 2019. http://dx.doi.org/10.1002/jsde.12330.
Дисертації з теми "Films stimulables":
Li, Mengxing. "Films minces d'hydrogels stimulables." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066268/document.
Thin films of hydrogels we study are chemical polymer networks covalently grafted on solid substrates. These versatile coatings allow the control of various interfacial properties such as responsive properties, wetting or mechanical properties. Here, thin films of stimuli-responsive hydrogels (with temperature, light or electric field) are the point of interest. The surface-attached gel films are synthesized by following a straightforward strategy based on thiol-ene click chemistry. The formation of the films is achieved by adding bifunctional thiol molecules as cross-linkers to the ene-reactive polymers on thiol-modified surfaces. This strategy allows us to obtain hydrogel films with a wide range of thickness and with the desired properties. We study the structure of surface-attached poly(N-isopropylacrylamide) gel films which show thermo-responsive properties. We determine the effect of confinement and constraints due to the surface-attachment on the swelling/collapse phase transition of hydrogels with two approaches: the one-dimension swelling normal to the surface using ellipsometry and neutron reflectivity and the in-plane observation of the free surface of the gel using AFM. New and complex hydrogel films are also developed by targeting the architecture of the polymer networks. Inspired from macroscopic hydrogels architecture, we design various architectures: multilayer gel films, interpenetrating networks (IPN) gel films and hybrid gel films
Li, Mengxing. "Films minces d'hydrogels stimulables." Electronic Thesis or Diss., Paris 6, 2014. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2014PA066268.pdf.
Thin films of hydrogels we study are chemical polymer networks covalently grafted on solid substrates. These versatile coatings allow the control of various interfacial properties such as responsive properties, wetting or mechanical properties. Here, thin films of stimuli-responsive hydrogels (with temperature, light or electric field) are the point of interest. The surface-attached gel films are synthesized by following a straightforward strategy based on thiol-ene click chemistry. The formation of the films is achieved by adding bifunctional thiol molecules as cross-linkers to the ene-reactive polymers on thiol-modified surfaces. This strategy allows us to obtain hydrogel films with a wide range of thickness and with the desired properties. We study the structure of surface-attached poly(N-isopropylacrylamide) gel films which show thermo-responsive properties. We determine the effect of confinement and constraints due to the surface-attachment on the swelling/collapse phase transition of hydrogels with two approaches: the one-dimension swelling normal to the surface using ellipsometry and neutron reflectivity and the in-plane observation of the free surface of the gel using AFM. New and complex hydrogel films are also developed by targeting the architecture of the polymer networks. Inspired from macroscopic hydrogels architecture, we design various architectures: multilayer gel films, interpenetrating networks (IPN) gel films and hybrid gel films
Chollet, Benjamin. "Hydrogels greffés stimulables comme actionneurs microfluidiques." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066494/document.
We develop a new method to build microactuators using stimuli-responsive hydrogels. The hydrogel is synthesized with covalent attachment to the microchannel bottom walls prior to closing the microsystem, contrarily to previous approaches. We use a new stimuli-responsive hydrogel films synthesis pathway. This synthesis is based on thiol-ene click chemistry. The formation of films is achieved by adding bifunctional thiol molecules as cross-linkers to ene-functionalized preformed polymers on thiol-modified surfaces. The cross-linking and grafting are simultaneously performed either by thermal activation or UV-irradiation. Hydrogel films and micro-patterns are easily obtained in a wide range of thickness from hundred nanometers to several microns. We show that these responsive hydrogels patterns can be integrated into microfluidics channels to build microactuators. We focus on thermo-sensitive actuators made from poly(N-isopropylacrylamide). Under temperature, hydrogel patterns reversibly swell and collapse by absorbing/expulsing water. The phase transition is rapid (lower than 1 second), abrupt (a few degrees around the LCST at 32°C) and the deformation amplitude is high (400% swelling). Microvalves obtained by this approach exhibit high performances and durability. Moreover, we develop new reconfigurable actuators functioning as microfluidic traps. These new-concept microfluidic actuators offer wide possibilities because of their ease of fabrication, their performances and their ability to be integrated into high density
Chollet, Benjamin. "Hydrogels greffés stimulables comme actionneurs microfluidiques." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066494.
We develop a new method to build microactuators using stimuli-responsive hydrogels. The hydrogel is synthesized with covalent attachment to the microchannel bottom walls prior to closing the microsystem, contrarily to previous approaches. We use a new stimuli-responsive hydrogel films synthesis pathway. This synthesis is based on thiol-ene click chemistry. The formation of films is achieved by adding bifunctional thiol molecules as cross-linkers to ene-functionalized preformed polymers on thiol-modified surfaces. The cross-linking and grafting are simultaneously performed either by thermal activation or UV-irradiation. Hydrogel films and micro-patterns are easily obtained in a wide range of thickness from hundred nanometers to several microns. We show that these responsive hydrogels patterns can be integrated into microfluidics channels to build microactuators. We focus on thermo-sensitive actuators made from poly(N-isopropylacrylamide). Under temperature, hydrogel patterns reversibly swell and collapse by absorbing/expulsing water. The phase transition is rapid (lower than 1 second), abrupt (a few degrees around the LCST at 32°C) and the deformation amplitude is high (400% swelling). Microvalves obtained by this approach exhibit high performances and durability. Moreover, we develop new reconfigurable actuators functioning as microfluidic traps. These new-concept microfluidic actuators offer wide possibilities because of their ease of fabrication, their performances and their ability to be integrated into high density
Votte, Guillaume. "Synthèse de cristaux photoniques modulables à partir de films minces d’hydrogel stimulables." Electronic Thesis or Diss., Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLS010.
Research in the field of synthetic photonic crystals has been advancing at high speed. In thedevelopment of this field, additional performances in terms of modularity and switchabilityusing soft matter and polymers provide unprecedented enhanced devices. In this thesis, wedeveloped a platform of stimuli-responsive nano- and microstructured polymer hydrogelsthat are surface-grafted to ensure chemical stability regardless of environmental change.This strategy is based on CLAG chemistry which consists in simultaneous Cross-Linking AndGrafting of polymer chains on the substrate. This platform is exploited to fabricate stimulableBragg mirrors with large amplitude of spectral shift. We also developed a strategy allowingus to design two-dimensional photonic cristals by using photolithographic masks. Finally, wedemonstrated that the hydrogel platform allows the coupling of temperature with otherstimuli: chemical, mechanical, light and electromagnetic field for plasmonic and magnetichyperthermia
Boularas, Mohamed. "Synthèse de microgels biocompatibles, hybrides et stimulables pour des applications cosmétiques." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3052/document.
Smart polymer materials can provide wide range of options to induce advanced functional features and relevant surface properties in one material. This all-in-one concept is of great interest for applications that require several simultaneous treatments such as cosmetic application. Herein, we aim to develop oligo(ethylene glycol)-based biocompatible multiresponsive microgels that could both interact on the skin as smart drug delivery system (DDS) while fulfilling advanced properties such as surface protection, mechanical and optical properties. Specifically, aqueous dispersed microgels responsive to pH, temperature and magnetic field were synthesized via multi-step strategy: 1. The synthesis and characterization of pH- and thermo-responsive oligo(ethylene glycol)-based microgels by precipitation polymerization, 2. The encapsulation of pre-formed magnetic nanoparticles via adsorption of the nanoparticles into the multiresponsive microgels. The effect of the microgel microstructure on their pH- and thermo-responsive properties were highlighted thanks to a rational investigation of the crosslink density and acid-functional units distribution within the microgels. Oligo(ethylene glycol)-based microgels with homogeneous distribution of both acid-functional unit and crosslinker allowed the synthesis of highly pH-and thermo-responsive microgels. The hybrid microgels prepared by straightforward encapsulation of pre-formed magnetic nanoparticles were characterized. The homogeneous microstructure of the initial stimuli-responsive biocompatible microgels plays a crucial role for the design of unique well-defined ethylene glycol-based thermoresponsive hybrid microgels. Thus, robust monodisperse thermoresponsive magnetic microgels were produced, exhibiting both a constant value of the swelling-to-collapse transition temperature and good colloidal stability whatever the NPs content. These smart microgels can spontaneously form a transparent film with perfect arrangement of the microgels by simple solvent evaporation process. The characterization of the optical and mechanoelectrical properties of the self-assembled microgel films were performed. We highlighted that the presence of anionic charges inside the microgels emphasizes the mechanoelectrical effect of the films
Zouari, Riadh. "Propriétés mécaniques de films de polyélectrolytes biocompatibles et de systèmes stimulables à base de cristaux liquides." Strasbourg, 2009. http://www.theses.fr/2009STRA6002.
The work presented in this thesis has two distinct parts relating to the mechanical properties of polymer systems, namely polyelectrolytes multilayer (PEM) films and liquid crystal elastomers (LCE) in the dry state and in the swollen state, with a low molecular weight liquid crystal (LMWLC) as solvent. The experiments were carried out using an original piezorheology device developed in our laboratory, which imposes very low shear and compression strains to materials, in a wide frequency range (20 mHz – 104 Hz). All measurements were done in the linear response regime. The first part focuses on the mechanical properties of polyelectrolyte films called multilayers with exponential growth. It presents the first experimental evidence showing that these films are neither gels nor layered systems as was thought until now, but liquids consisting of polyelectrolyte complexes in solution. The cross-linked films are soft gels (~ 104 Pa) whose formation kinetic is governed by a single mechanism. In the second part, we investigate the mechanical properties of nematic monodomain (or uniaxial) side chain LCE, when they are dry, and then swollen with a LMWLC. The main results can be summarized as follows: a) the mechanical behavior can be simply described by the de Gennes model and not by the concept of soft or semi-soft elasticity, b) a progressive swelling transforms the supercritical elastomer into a gel exhibiting a first-order nematic to paranematic transition, and then into a supercritical gel when the swelling is total, c) chains are not Gaussian, d) the fully swollen gel is characterized by a “dip” in the curve giving the thermal variation of the real part of the shear modulus. This dip does not depend neither on the shear direction, perpendicular or parallel to the director, nor on the polydomain or monodomain structure of the elastomer. The supercritical state is confirmed by NMR measurements
Lopes, Da Costa Lisa. "Conception d’actionneurs à base de nanofibres de cellulose induits par l’eau." Electronic Thesis or Diss., Nantes Université, 2023. http://www.theses.fr/2023NANU4060.
Shape change is particularly observed in the plant kingdom, such as the opening and closing of pine cone scales driven by humidity. This ability to move in response to an external stimulus is known as actuation. The aim of this thesis is to design actuators inspired by this natural phenomenon using cellulose nanofibers (CNF). CNF are an excellent plant-based raw material for actuators thanks to their hydroxyl groups, which allow the introduction of stimuli- sensitive chemical groups, their hydrophilicity, and their excellent mechanical properties. Herein, CNF were functionalized and assembled into bilayer films undergoing asymmetric expansions when immersed in water. These asymmetric expansions enabled the films to bend and/or twist. The differential water uptake between layers is the driving force behind the film actuation. Hydration and dehydration were controlled by the degree of functionality of the CNF and by film immersion in aqueous solutions at different pH or in organic solvents. The mechanisms of actuation were studied by analyzing the structure of functionalized CNF, assessing the water uptake and mechanical performances of the films, and determining the main physico- chemical interactions between the different CNFs and immersion media. This study is a proof-of-concept that CNF-based actuators have a great potential for various applications such as soft robotics or biomedical devices
Dieuzy, Éva. "Relationship between structural and rheological properties of dual-stimuli responsive microgel films for cosmetic and biomedical applications." Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3035.
This research work relates to colloidal-based films formed by the self-assembly of pH- and thermo-responsive oligo(ethylene glycol) methacrylate-based microgels. In this study, the impact of the microgel structure on the macroscopic and mechanical properties of films has been investigated. To this end, microgels were synthesized with different core-shell architectures by varying the crosslinking density and the crosslinker type. Viscosity and creep measurements on highly concentrated dispersions of microgels have proved to be particularly sensitive to the microgel architecture. More precisely, softer particles with longer and/or more crosslinked dangling chains have a higher ability to interpenetrate and form a stronger network. In addition, the study of the microgel-based films in the linear and non-linear domains confirmed the chain interdiffusion largely drives the mechanism of deformation and consequently, the microgel architecture is a key parameter influencing the macroscopic properties of films. Considering their colloidal assembly, these films have demonstrated excellent mechanical properties such as strain hardening and high strain at break. In addition, they’ve exhibited suitable properties reaching the criteria that the underlying skin substrate imposes, i.e. a low Young’s modulus and a high elongation at break. Finally, in the light of potential industrial uses, a strategy has been developed to broaden and drive the mechanical properties of films by using a water-soluble polymer which is a side-product from the microgel synthesis
Pinaud, Florent. "Etude des propriétés interfaciales et luminescentes de microgels stimulables." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0096/document.
Microgels are colloidal particles made of cross-linked polymer swollen by a solvent. Soft and porous, they can adapt their swelling degree in response to a stimulus. The main objective of this work is to develop new concepts taking advantage of microgels’ stimuli-responsive properties and intrinsicsoftness while deepening understanding of their properties in solution and at interfaces. Poly(Nalkylacrylamide) microgels are used as a model. Initially our work focused on the study of a new type of electrochemiluminescent (ECL) microgels thanks to the incorporation of a ruthenium complex in the polymer matrix. At the volume phase transition, these microgels exhibit an amplification of the ECL intensity up to 2 orders of magnitude, related to the decrease of the distance between redox sites. This concept is then transposed to saccharides-sensitive microgels and systems bearing two luminophores, an ECL donor and an energy acceptor in order to give rise to resonance energy transfer. The second part of this manuscript is devoted to adsorption of microgels at a planar liquid-liquid interface, to improve knowledge on the origin of the stability of emulsions stabilized by such objects. Such as flexible proteins, microgels can change their conformation at the interface, from an extended to a compressed state, causing variation in the interfacial elasticity. When microgels are adsorbed they can also be functionalized regioselectively in water to produce non-symmetrical microgels, called Janus, able to self-assemble
Тези доповідей конференцій з теми "Films stimulables":
Saha, Santanu. "Application of Computed Radiography in Pressure Vessel Welds: ASME Sec V Requirements and Recommendations of ASTM E2007." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65964.
Pond, Gerald D., George W. Seeley, Mark T. Yoshino, Mark M. Chernin, Kenneth McIntyre, Hugo V. Villar, Tim B. Hunter, and Theron W. Ovitt. "Comparison Of Conventional Film/Screen To Photo-Stimulable Imaging Plate Radiographs For Intraoperative Arteriography And Cholangiography." In Medical Imaging II, edited by Roger H. Schneider and Samuel J. Dwyer III. SPIE, 1988. http://dx.doi.org/10.1117/12.968625.
Noordveld, Robert B., Leo J. S. Kool, Herman M. Kroon, Paul R. Algra, George W. Seeley, Henri E. Lemmers, Hugo Vlasbloem, and Volker Biebesheimer. "The Effect Of AMBER (Advanced Multiple Beam Equalization Radiography) On Image Quality Of Film And Stimulable Phosphor Plates." In 1989 Medical Imaging, edited by Samuel J. Dwyer III, R. Gilbert Jost, and Roger H. Schneider. SPIE, 1989. http://dx.doi.org/10.1117/12.953193.