Literatura académica sobre el tema "Photochromic Gels"
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Artículos de revistas sobre el tema "Photochromic Gels"
Moraes, Thaisa B. F., Marcos F. R. A. Schimidt, Rebeca Bacani, Gabriel Weber, Mario J. Politi, Bruna Castanheira, Sergio Brochsztain, Francisco de A. Silva, Grégoire J. F. Demets y Eduardo R. Triboni. "Polysilsesquioxane naphthalenediimide thermo and photochromic gels". Journal of Luminescence 204 (diciembre de 2018): 685–91. http://dx.doi.org/10.1016/j.jlumin.2018.08.036.
Texto completoBobrovsky, Alexey, Valery Shibaev, Věra Hamplová, Vladimíra Novotna y Miroslav Kašpar. "Photochromic and fluorescent LC gels based on a bent-shaped azobenzene-containing gelator". RSC Advances 5, n.º 70 (2015): 56891–95. http://dx.doi.org/10.1039/c5ra07234d.
Texto completoTaniguchi, Takuya, Toru Asahi y Hideko Koshima. "Photomechanical Azobenzene Crystals". Crystals 9, n.º 9 (22 de agosto de 2019): 437. http://dx.doi.org/10.3390/cryst9090437.
Texto completoZhang, Yuzhi, Jiaguo Yuan, Yunzhen Cao, Lixin Song y Xingfang Hu. "Photochromic behavior of Li-stabilized MoO3 sol–gels". Journal of Non-Crystalline Solids 354, n.º 12-13 (febrero de 2008): 1276–80. http://dx.doi.org/10.1016/j.jnoncrysol.2006.11.035.
Texto completoGao, Jie, Wen‐Da Zhang, Lin‐Lin Wang, Yu‐Xuan Chen, Ya‐Xiang Shi, Wei Ji, Zexiao Xu, Xiaodong Yan y Zhi‐Guo Gu. "Ultrafast Photochromic Self‐Healing Polymer Gels with Tunable Fluorescence". Macromolecular Materials and Engineering 307, n.º 3 (30 de noviembre de 2021): 2100758. http://dx.doi.org/10.1002/mame.202100758.
Texto completoHania, P. R., A. Pugžlys, L. N. Lucas, J. J. D. de Jong, J. van Esch, B. Feringa y K. Duppen. "Reaction Dynamics and Applications in Patterning of Bisthienylcyclopentene-Based Photochromic Switches". Solid State Phenomena 97-98 (abril de 2004): 207–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.97-98.207.
Texto completoNakao, Ren, Norikazu Ueda, Yasuo Abe, Toyokazu Horii y Hiroo Inoue. "New photochromic inorganic/organic hybrid siloxane gels with chemically bonded spirobenzopyran moiety". Polymers for Advanced Technologies 5, n.º 4 (abril de 1994): 240–41. http://dx.doi.org/10.1002/pat.1994.220050407.
Texto completoHou, L., B. Hoffmann, M. Mennig y H. Schmidt. "Preparation and photochromic properties of dye-doped aluminosilicate and ORMOCER gels and coatings". Journal of Sol-Gel Science and Technology 2, n.º 1-3 (1994): 635–39. http://dx.doi.org/10.1007/bf00486324.
Texto completoMoriyama, M., N. Mizoshita, T. Yokota, K. Kishimoto y T. Kato. "Photoresponsive Anisotropic Soft Solids: Liquid-Crystalline Physical Gels Based on a Chiral Photochromic Gelator". Advanced Materials 15, n.º 16 (15 de agosto de 2003): 1335–38. http://dx.doi.org/10.1002/adma.200305056.
Texto completoWang, Zhongchun, Xingfang Hu y Ulf Helmersson. "Peroxo sol–gel preparation: photochromic/electrochromic properties of Mo–Ti oxide gels and thin films". Journal of Materials Chemistry 10, n.º 10 (2000): 2396–400. http://dx.doi.org/10.1039/b004933f.
Texto completoTesis sobre el tema "Photochromic Gels"
Malek, Mohamad Zahid Abdul. "Synthesis, processing and characterisation of photochromic dye doped sol-gel materials". Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310760.
Texto completoNeto, Elias Paiva Ferreira. "Filmes híbridos fotocrômicos de Ormosil-fosfotungstato dopados com os cátions divalentes Zn2+, Mg2+, Ca2+, Sr2+e Ba2+". Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-12092014-155541/.
Texto completoIn this study photohromic materials wer prepared by the entrapment of the Keggin heteropoyoxometalate phosphoungstate [PW12O40]3 (HPW) in a Ormosil (Organically Modified Silicates) hybrid matrix. We evaluated the impact of the addition of the divalent cations Zn2+, Mg2+, Ca2+, Sr2+ and Ba2+ on the properties of Ormosil-phosphotungstate films. The materials were prepared by sol-gel route and deposited as thin films on different substrates by dip coating method. The formation of the hybrid organosilicate network and the presence of the Keggin heteropolianion [PW12O40]3- were confirmed by FTIR and Raman vibrational spectroscopies. The x-ray diffractograms of the xerogels samples indicated that the materials present semi-crystalline behavior. A broad diffraction peak in the 2θ<10° region pointsto the possible formation octasilsesquioxane discrete units and/or silicate lamellae. Transmission electron microscopy studies revealed that the cations addition during the sol-gel synthesis induces the precipitation of nano-agglomerates composed of HPW and the doping cations. Zn K-edge XANES analysis suggests that the Zn2+ doping cations are associated to the heteropolianions forming [Zn(OH2)6]x/2Hx-3PW12O40 salt agglomerates. The entrapment of these agglomerates in the organosilicate network during dip-coating deposition results in the preparation of films with enhanced incorporation of phosphotungstate as demonstrated by XRF analysis. Ba2+ doping enhances in almost seven times the amount of incorporated phosphotungstate. This behavior is explained by the fact that as the solubility of polyoxometalate salts greatly decreases with the increase counter cation size, the formation of the agglomerates is favored in the presence of the larger cations (Sr2+ and Ba2+). The enhanced incorporation of the photoactive specie reflects on the phtochromic response of the doped hybrud films, wich increases in the range of 35% (Mg2+ doped sample) to 685% (Ba2+ doped sample). Therefore, the addition of the cations during sol-gel synthesis of the Ormosil-phosphotungstate nanocomposite represents a simple and reproducible strategy for the preparation of films with enhanced photochromic properties. These highly photochromic hybrid films are promising candidates for the design of practical UV-sensing devices and dosimeters.
Mello, Lucas Braga de [UNESP]. "Preparação e caracterização de filmes híbridos de (AgNO3)". Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144366.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O processo Sol-Gel tem permido preparar materiais vítreos ou vítro-cerâmicos com novas composições com alto grau de pureza, homogêneos, materiais híbridos orgânicos e inorgânicos (OIHM) e até materiais impossíveis de serem preparados por processos convencionais. Um dos melhores sistemas para obtenção dos OIHM de sílica (ORMOSIL – Silicato Organicamente Modificado) é a reação combinada com alcoóxidos de Silício como o TEOS (Tetraetilortosilicato) e alcoóxidos funcionalizados como o GPTS (3-Glicidoxipropil-trimetoxisilano). A Prata, é aplicada em diversas áreas como por exemplo, em pinturas a base de Prata (utilizados para circuitos impressos), em filmes fotográficos, películas de vidros dentre várias outras aplicações. Dois efeitos encontrados quando uma amostra GTD-Ag (Amostra com a dopagem de AgNO3), irradiada por uma lâmpada UV e tratada a temperatura (acima de 80 °C), são os efeitos fotocrômicos e termocrômicos. Para o efeito fotocrômico, a irradiação por lâmpada UV, produz partículas de prata oxidadas (Ag+) que transformam-se em partículas de prata reduzidas (Ago), ocorrendo-se assim, o escurecimento dos filmes (redução). O clareamento das amostras GTD-Ag (oxidação), foi obtido através de um agente oxidante, o H2O2. Para observar o efeito termocrômico, as amostras GTD-Ag, são tratadas em forno convencional em temperaturas de 80 °C à 550 °C em atmosferas de N2 e ambiente. No tratamento térmico em atmosfera de N2, foi possível observar o escurecimento (redução) da amostra, a partir da temperatura de 80 °C, e em tratamento térmico à atmosfera ambiente, observamos um clareamento da amostra (oxidação), a partir da temperatura de 200 °C. Utilizando a técnica de análise térmica diferencial (DTA), foi possível verificar a óxido-redução da amostra GTD-Ag, quando tratada em atmosfera ambiente, em temperaturas superiores a 150 °C. Comportamento semelhante é observado para as amostras GTD (Amostra sem dopagem de AgNO3), em temperaturas acima de 200 °C, ocorrendo um efeito conhecido por pirólise, que no nosso caso é a degradação do grupo epóxi.
The sol-gel process has allowed prepare vitreous or vitro-ceramic materials with novel compositions with high purity, homogeneous, organic and inorganic hybrid materials (OIHM) and impossible materials to be prepared by conventional methods. One of the better systems for obtaining OIHM silica (ORMOSIL - Silicate Organically Modified), is the combined reaction of silicon alkoxides such as TEOS (Tetraethylorthosilicate), and functionalised alkoxides such as GPTS (3- Glycidoxypropyl-trimethoxysilane). The Silver is applied in various areas such as Silver paintings (used for printed circuits) on photographic films, glass films among many other applications. Two effects found when a GTD-Ag sample (Sample with AgNO3 doping) irradiated by a UV lamp and treated at temperatures (above 80 °C), are photochromic and thermochromic effects. For the photochromic effect, the UV irradiation lamp produces oxidized silver particles (Ag+) which becomes reduced particles silver (Agº), occurring to thereby darkening of the films (reduction). The samples of the bleaching GTD-Ag (oxidation) were obtained by an oxidizing agent H2O2. To observe the thermochromic effect, the GTD-Ag samples are treated in a conventional oven at temperatures of 80 °C to 550 °C in N2 atmosphere and ambient. In the heat treatment in N 2 atmosphere, was observed to darkening (reduction) of the sample from the 80 °C temperature and treatments to the ambient atmosphere, we observed a whitening of the sample (oxidation) at low temperature 200 °C. Using the differential thermal analysis (DTA), we found the redox sample GTD-Ag, when treated in atmosphere ambient at temperatures above 150 °C. Similar behavior is observed for the GTD samples (Sample undoped AgNO3) at temperatures above 200 °C, occurring an effect known by pyrolysis which in our case is the degradation of the epoxy group.
Lafuma, Aurélie. "Comportement Photochrome de Colorants Organiques Dopés dans des Matrices Hybrides Organique-Inorganiques Solides : interactions Colorant-Matrice". Paris 6, 2001. http://www.theses.fr/2001PA066571.
Texto completoNoveletto, Julia Cristina. "Síntese foto-assistida de nanopartículas de prata metálica em filmes híbridos de Ormosil-fosfotungstato". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-27072017-112348/.
Texto completoSol gel entrapment of photoactive compounds in organic-inorganic hybrid matrices is an interesting strategy for the preparation of photochromic materials with potential technological applications. In this study, we report the preparation of photoactive Ormosil (organically modified silicates) hybrid films containing the Keggin polyoxometalate phosphotungstate (H3PW12O40) and Ag+ cations by sol-gel synthesis and dip coating deposition. The materials have been characterized by infrared absorption spectroscopy (FTIR), Raman spectroscopy and X-ray Fluorescence (XRF), thus evidencing the formation of hybrid organosilicate matrix and the entrapment of the PW12O40-3 polyanions and Ag+ cations. The photochromic behavior of the Ormosil-phosphotungstate films is based on photoinduced reduction of phosphotungstate upon exposure to UV radiation, which leads to the formation of colored mixed valence compounds known as heteropolyblues. However, the presence of Ag+ cations completely changes the photochromic behavior of these hybrid films. The photoreduced phosphotungstate polyanions rapidly promote the reduction of Ag+ cations, resulting in the in situ formation of silver metal nanoparticles (Ag0) inside the hybrid matrix as evidenced by the intense plasmonic band centered at 390nm as shown by electronic, UV-vis, spectroscopy and its yellowish color. The Uv-vis and X-ray Near Edge Absorption Spectroscopy (XANES) characterization shown that this process is reversible and the yellowish color characteristic of the metallic silver nanoparticles disappears once the hybrid films are heated at 353 K. Thus, the coloration is achieved upon UV exposure and discoloration occurs upon simple heating. Therefore, the described photoactive properties, the prepared hybrid films have potential application in optical memory systems, single bandpass optical filters, non-linear optical devices, UV radiation sensors and bactericidal coatings.
Tricot, Fanny. "Films réinscriptibles sur supports souples". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES007/document.
Texto completoPrevious research conducted at laboratory Hubert Curien led to the development of photosensitive Ag: TiO2 films on glass as support for updatable or permanent patterns. An adaptation of this work to plastic and paper substrates is proposed here to broaden the possible application areas such as goods secure labeling, for example. Fabrication techniques of Ag: TiO2 films compatible with flexible substrates have been developed, using two different paths. The first uses the combination of Sol-Gel chemistry with the EISA method. Deposition processes such as spin coating, inkjet or flexographic printing are used to form a mesoporous film of TiO2 on substrates. Treatments based on solvent extraction or infrared annealing have been devised to release the porosity of the film without damaging the supports. Silver salt is either introduced into the titania pores by soaking the films into a silver salt solution or added to the sol before its coating. The second developed option proposes formulating an aqueous ink jet ink made of TiO2 nanoparticles and silver ions by adapting the composition of a commercial suspension of TiO2 with the requirements of the ink jet process. After printing, the ink is dried by infrared annealing. The photochromic behavior under UV and visible light exposures of fabricated films allows to get coloring and bleaching reversibly. Sol-Gel films coated on plastic can also be a support for permanent colored patterns realized by irradiation with a visible light of certain intensity
Nadar, Latifa. "Surfaces fonctionnalisées à base de nanoparticules métalliques pour l'optique et la photonique". Phd thesis, Université Jean Monnet - Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00700483.
Texto completoSamanta, Suman Kalyan. "Design, Synthesis and Properties of Novel Oligo-Phenylenevinylene based Supramolecular Photochromic Gels and Soft Composites with Nanomaterials". Thesis, 2011. http://etd.iisc.ac.in/handle/2005/4115.
Texto completoKlukowska, Anna. "Switching hybrid polymers with physically and covalently entrapped organic photochromes". Doctoral thesis, 2004. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-11721.
Texto completoDas Ziel dieser Arbeit war es, neue, über das Sol Gel Verfahren hergestellte Beschichtungsmaterialien zu entwickeln, die als Matrices für photochrome Spirooxazine und Chromene geeignet sind. Die Entwicklungs- und Optimierungsarbeit erfolgte über zwei Routen (Farbstoff- und Matrix-Rout) und führte zu komplexen photochromen Mehrschichtaufbauten, deren Einfärbungs und Photostabilitätseigenschaften mit kommerziell erhältlichen Produkten vergleichbar sind. Über das Sol-Gel Verfahren hergestellte hybride Polymere stellen geeignete Wirtsmaterialien für photochrome Farbstoffen dar. Die Eigenschaften der Matrix und die Einbauweise beeinflussen sowohl die photochrome Aktivität, als auch die Degradationsgeschwindigkeit und Kinetik der eingebauten Farbstoffe. Farbstoffe integriert in rigide Matrices höherer Polarität zeigen geringere Schaltgeschwindigkeit und stärkere Einfärbung, jedoch verknüpft mit höherer Degradationsgeschwindigkeit. Andererseits Matrixmaterialien mit eher unpolarem Charakter, niedriger Konzentration an Restwasser, und niedriger Rigidität sind zu bevorzugen, wenn gute Photostabilität erreicht werden soll. Wesentliche Unterschiede bestehen zwischen chemisch angebundenen und physikalisch eingebauten Farbstoffen. Durch den Einsatz von silylierten Farbstoffen, die am Sol Gel-Prozess partizipieren können, kann eine Verringerung der Photodegradationsgeschwindigkeit im Vergleich zu physikalisch eingebauten Farbstoffen erreicht werden. Höhere Photostabilität und langsamere Schaltkinetikt sind vermutlich auf sterische Hinderung zurückzuführen. Der Zusatz geeigneter Stabilisatoren erhöht die Photostabilität: Der Einsatz von UV Stabilisatoren, Excited State Quenchern und HALS ist vorteilhaft aber nicht ausreichend. Neben der Präsenz von Stabilisatoren, führt auch die Verringerung der Sauerstoffpermeation (durch eine harte Deckschicht und eine reflexionsmindernde PVD Beschichtung) zu einer Stabilitätserhöhung. Schließlich wurde gefunden, dass die räumliche Trennung der Farbstoffe in zwei (oder mehr) unabhängigen Schichten ebenfalls die Färbetiefe und Photoresistenz der Beschichtungen erhöhte, vermutlich dadurch, dass der Kontakt von Farbstoffmolekülen mit angeregten Zuständen anderer Moleküle oder ihren Degradationsprodukten verhindert oder zumindest eingeschränkt wird. Diese Befunde können den Weg für stabile photochrome Beschichtungen auf de Basis von Hybridpolymeren ebnen. Weiterer Optimierungsbedarf wird in den bisher erzielbaren Farbtönen gesehen. Zukünftige Entwicklungen sollten sich auf photostabilere gelb und rot schaltende Farbstoffe konzentrieren. Die Ergebnisse der vorgelegten Untersuchungen können bei der Auswahl der am besten geeigneten, molekularen Umgebung für erprobte Photochrome in Bezug auf Photostabilität, Kinetik und Aktivität helfen. Dies ist von großer Bedeutung im Hinblick auf mögliche Anwendung vor allem im ophthalmischen Bereich. Darüber hinaus bergen die interessante Eigenschaftskombinationen dieser Art von Materialien großes Potential für ein weites Feld möglicher Anwendungen (Sonnenbrillen, Strahlungsschutz, Filter, Sonnendächer, schaltbare Markierungen, Druck, Textilien)
Chi, Bo-Jen y 紀柏任. "Enhanced Photochromism of chromen-based colorants near Silver Nanorods in Sol-Gel matrix". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/53109248730575045138.
Texto completoCapítulos de libros sobre el tema "Photochromic Gels"
Fries, K., C. Fink-Straube, M. Mennig y H. Schmidt. "Photochromic Coatings". En Sol-Gel Technologies for Glass Producers and Users, 251–59. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-0-387-88953-5_33.
Texto completoIrie, M. "Photoresponsive polymers: reversible control of polymer conformation in solution and gel phases". En Applied Photochromic Polymer Systems, 174–206. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-3050-9_5.
Texto completoAvnir, David, Michael Ottolenghi, Sergei Braun, Ovadia Lev y David Levy. "Organically Doped Sol-Gel Porous Glasses: Chemical Sensors, Enzymatic Sensors, Electrooptical Materials, Luminescent Materials and Photochromic Materials". En Sol-Gel Optics, 539–82. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2750-3_23.
Texto completoRaghavan, Srinivasa. "TiO2 Nanostructures by Sol–Gel Processing". En Sol-Gel Method - Recent Advances [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.111440.
Texto completoNakazumi, H., S. Matsumoto y K. Isagawa. "Photochromic behavior of spiropyrans in glass thin films formed by the sol-gel method". En Advanced Materials '93, 323–26. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-4832-8380-7.50080-8.
Texto completoActas de conferencias sobre el tema "Photochromic Gels"
Lopez-Amo, Manuel, David Levy, Francisco del Monte, Ignacio R. Matias, Partha Datta-Chowdhury y Jose M. Oton. "Gel-glass photochromic optical delay generator". En Advanced Networks and Services, editado por S. Iraj Najafi y Henri Porte. SPIE, 1995. http://dx.doi.org/10.1117/12.201973.
Texto completoJanik, Ryszard y Stanislaw Kucharski. "Polymer modified sol-gel materials for photochromic applications". En SPIE Optics + Photonics, editado por Susanna Orlic y Klaus Meerholz. SPIE, 2006. http://dx.doi.org/10.1117/12.680055.
Texto completoKe, Xianjun, Michael R. Wang, Sangyup Song, Daqun Li y Jame J. Yang. "All-Optical Controlled Tunable Optical Filter Using Photochromic Sol Gel Material". En Frontiers in Optics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/fio.2005.fthy3.
Texto completoMennig, Martin, Herbert Krug, Claudia Fink-Straube, Peter W. Oliveira y Helmut K. Schmidt. "Sol-gel-derived AgCl photochromic coating on glass for holographic application". En San Diego '92, editado por John D. Mackenzie. SPIE, 1992. http://dx.doi.org/10.1117/12.132030.
Texto completoNakazumi, Hiroyuki, Rie Nagashiro, Shinya Matsumoto y Kakuzoh Isagawa. "Photochromic glass thin film formed by the sol-gel coating method". En SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, editado por John D. Mackenzie. SPIE, 1994. http://dx.doi.org/10.1117/12.188974.
Texto completoYamanaka, Stacey A., Jeffrey I. Zink y Bruce S. Dunn. "Photochromism of sol-gel glasses containing encapsulated organic molecules". En San Diego '92, editado por John D. Mackenzie. SPIE, 1992. http://dx.doi.org/10.1117/12.132028.
Texto completoHou, Lisong, Martin Mennig y Helmut K. Schmidt. "Photochromic organic-inorganic composite materials prepared by sol-gel processing: properties and potentials". En Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, editado por Volker Wittwer, Claes G. Granqvist y Carl M. Lampert. SPIE, 1994. http://dx.doi.org/10.1117/12.185377.
Texto completoKe, Xianjun, Michael R. Wang, Sangyup Song, Daqun Li y Jame J. Yang. "All-Optical Controlled Mach-Zehnder Based Variable Optical Attenuator Using Photochromic Sol Gel Material". En Frontiers in Optics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/fio.2005.fthq3.
Texto completoChaput, Frederic, Khalid Lahlil, John Biteau, Jean-Pierre Boilot, Bruno Darracq, Yves Levy, Jacques Peretti, Viatcheslave I. Safarov, Jean-Marie Lehn y Alvaro Fernandez-Acebes. "Design of optical components and optical data storage in photochromic sol-gel films containing dithienylethene or azobenzene derivatives". En Symposium on Integrated Optoelectronics, editado por Bruce S. Dunn, Edward J. A. Pope, Helmut K. Schmidt y Masayuki Yamane. SPIE, 2000. http://dx.doi.org/10.1117/12.384357.
Texto completoFlores, James J. y Eric L. Chronister. "Doped sol-gel materials as a matrix for fast-response photochromic devices and as a pororus cladding for fiber optic chemical sensors". En 1996 Symposium on Smart Structures and Materials, editado por Andrew Crowson. SPIE, 1996. http://dx.doi.org/10.1117/12.232140.
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