Bibliografie tematiche / Photoresponsive systems

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Letteratura scientifica selezionata sul tema "Photoresponsive systems"

Autore: Grafiati
Pubblicato: 26 ottobre 2024

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Articoli di riviste sul tema "Photoresponsive systems"

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Park, Hea-Lim, Min-Hoi Kim e Hyeok Kim. "Improvement of Photoresponse in Organic Phototransistors through Bulk Effect of Photoresponsive Gate Insulators". Materials 13, n. 7 (28 marzo 2020): 1565. http://dx.doi.org/10.3390/ma13071565.

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In this study, we investigate the bulk effect of photoresponsive gate insulators on the photoresponse of organic phototransistors (OPTs), using OPTs with poly(4-vinylphenol) layers of two different thicknesses. For the photoresponse, the interplay between the charge accumulation (capacitance) and light-absorbance capabilities of a photoresponsive gate insulator was investigated. Although an OPT with a thicker gate insulator exhibits a lower capacitance and hence a lower accumulation capability of photogenerating charges, a thicker poly(4-vinylphenol) layer, in contrast to a thinner one, absorbs more photons to generate more electron–hole pairs, resulting in a higher photoresponse of the device. That is, in these two cases, the degree of light absorption by the photoresponsive gate insulators dominantly governed the photoresponse of the device. Our physical description of the bulk effect of photoresponsive insulators on the performance of OPTs will provide a useful guideline for designing and constructing high-performance organic-based photosensing devices and systems.
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Kinoshita, Takatoshi. "Photoresponsive membrane systems". Journal of Photochemistry and Photobiology B: Biology 42, n. 1 (gennaio 1998): 12–19. http://dx.doi.org/10.1016/s1011-1344(97)00099-7.

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Desvergne, Jean-Pierre, Frédéric Fages, Henri Bouas-Laurent e P. Marsau. "Tunable photoresponsive supramolecular systems". Pure and Applied Chemistry 64, n. 9 (1 gennaio 1992): 1231–38. http://dx.doi.org/10.1351/pac199264091231.

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Qu, Da-Hui, Qiao-Chun Wang, Qi-Wei Zhang, Xiang Ma e He Tian. "Photoresponsive Host–Guest Functional Systems". Chemical Reviews 115, n. 15 (20 febbraio 2015): 7543–88. http://dx.doi.org/10.1021/cr5006342.

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Zhou, Yang, Huan Ye, Yongbing Chen, Rongying Zhu e Lichen Yin. "Photoresponsive Drug/Gene Delivery Systems". Biomacromolecules 19, n. 6 (27 aprile 2018): 1840–57. http://dx.doi.org/10.1021/acs.biomac.8b00422.

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Abueva, Celine DG, Phil-Sang Chung, Hyun-Seok Ryu, So-Young Park e Seung Hoon Woo. "Photoresponsive Hydrogels as Drug Delivery Systems". Medical Lasers 9, n. 1 (30 giugno 2020): 6–11. http://dx.doi.org/10.25289/ml.2020.9.1.6.

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Revilla-López, Guillem, Adele D. Laurent, Eric A. Perpète, Denis Jacquemin, Juan Torras, Xavier Assfeld e Carlos Alemán. "Key Building Block of Photoresponsive Biomimetic Systems". Journal of Physical Chemistry B 115, n. 5 (10 febbraio 2011): 1232–42. http://dx.doi.org/10.1021/jp108341a.

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Qu, Da-Hui, Qiao-Chun Wang, Qi-Wei Zhang, Xiang Ma e He Tian. "ChemInform Abstract: Photoresponsive Host-Guest Functional Systems". ChemInform 46, n. 38 (settembre 2015): no. http://dx.doi.org/10.1002/chin.201538291.

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Menon, Sajith, Rahul M. Ongungal e Suresh Das. "Photoresponsive Glycopolymer Aggregates as Controlled Release Systems". Macromolecular Chemistry and Physics 215, n. 23 (10 settembre 2014): 2365–73. http://dx.doi.org/10.1002/macp.201400365.

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Chen, Hengjun, Min Li, Guiming Zheng, Yifang Wang, Yang Song, Conghui Han, Zhiyong Fu, Shijun Liao e Jingcao Dai. "Molecular packing, crystal to crystal transformation, electron transfer behaviour, and photochromic and fluorescent properties of three hydrogen-bonded supramolecular complexes containing benzenecarboxylate donors and viologen acceptors". RSC Adv. 4, n. 81 (2014): 42983–90. http://dx.doi.org/10.1039/c4ra07471h.

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Più fonti

Tesi sul tema "Photoresponsive systems"

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Ferrito, Maria Stefania <1986&gt. "Supramolecular Photoresponsive Systems". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7549/1/TesiDottoratoFerritoMstefania.pdf.

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Abstract (sommario):
This PhD research project deals with the synthesis and characterization of supramolecular photoresponsive systems based on the azobenzene unit. 1)Azobenzene-cyclodextrin inclusion complexes: the aim of this study was to obtain relatively simple, water-soluble derivatives, whose self-assembly could be reversibly controlled by light. On the basis of previous results, this opens the possibility of directly converting light into mechanical energy via osmosis. Several new azobenzene functionalized cyclodextrins have been synthesized, fully characterized and studied The inclusion complexes thus formed and their light-driven disassembly were studied by means of several complementary techniques including NMR, UV, CD, ICT, mass spectroscopy. The most suitable systems were used in experiments, still in progress, of light-to-mechanical energy conversion. 2)Azobenzene-guanosine hybrids: several novel azobenzene-guanosine hybrids were synthesized for the purpose of investigating the effect of cis-trans photoisomerization on guanosine self-assembly. Lipophilic guanosines in organic solvents can form either ribbon-like supramolecular polymers or, in the presence of alkali metal ions, G-quartet based supramolecular complexes. These complexes were fully characterized for newly synthesized azobenzene-guanosine hybrids. In the absence of ions, the ribbon-like supramolecular polymer gives rise to a gel-like system, which turned out to be a lyotropic liquid crystalline phase. Photoisomerization to cis form induces the transition to an isotropic solution, in a reversible fashion. In addition, the G-quartet structure obtained in the presence of alkali metal ions can be disassembled by light. 3) Oligoazobenzenes’s project. While several examples of electron-rich conjugated polymers are known and find application e.g. as electron donors in “plastic” photovoltaics, no examples are reported on the use of electron-poor conjugated polymers as acceptor counterpart. In particular, no polyazobenzenes having the (-C6H4-N=N-) repeat unit have ever been reported. Although no polymeric has been obtained yet, we succeeded in synthesizing several homologues up to a tetramer. The compounds were subjected to photophysical, photochemical and electrochemical characterization.
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Ferrito, Maria Stefania <1986&gt. "Supramolecular Photoresponsive Systems". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7549/.

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Abstract (sommario):
This PhD research project deals with the synthesis and characterization of supramolecular photoresponsive systems based on the azobenzene unit. 1)Azobenzene-cyclodextrin inclusion complexes: the aim of this study was to obtain relatively simple, water-soluble derivatives, whose self-assembly could be reversibly controlled by light. On the basis of previous results, this opens the possibility of directly converting light into mechanical energy via osmosis. Several new azobenzene functionalized cyclodextrins have been synthesized, fully characterized and studied The inclusion complexes thus formed and their light-driven disassembly were studied by means of several complementary techniques including NMR, UV, CD, ICT, mass spectroscopy. The most suitable systems were used in experiments, still in progress, of light-to-mechanical energy conversion. 2)Azobenzene-guanosine hybrids: several novel azobenzene-guanosine hybrids were synthesized for the purpose of investigating the effect of cis-trans photoisomerization on guanosine self-assembly. Lipophilic guanosines in organic solvents can form either ribbon-like supramolecular polymers or, in the presence of alkali metal ions, G-quartet based supramolecular complexes. These complexes were fully characterized for newly synthesized azobenzene-guanosine hybrids. In the absence of ions, the ribbon-like supramolecular polymer gives rise to a gel-like system, which turned out to be a lyotropic liquid crystalline phase. Photoisomerization to cis form induces the transition to an isotropic solution, in a reversible fashion. In addition, the G-quartet structure obtained in the presence of alkali metal ions can be disassembled by light. 3) Oligoazobenzenes’s project. While several examples of electron-rich conjugated polymers are known and find application e.g. as electron donors in “plastic” photovoltaics, no examples are reported on the use of electron-poor conjugated polymers as acceptor counterpart. In particular, no polyazobenzenes having the (-C6H4-N=N-) repeat unit have ever been reported. Although no polymeric has been obtained yet, we succeeded in synthesizing several homologues up to a tetramer. The compounds were subjected to photophysical, photochemical and electrochemical characterization.
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Tiberio, Giustiniano <1979&gt. "Molecular dynamics simulations of liquid crystals and photoresponsive systems". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/462/1/TIBERIO_GIUSTINIANO_DOTTORATO_SCIENZE_CHIMICHE_XIX_CICLO.pdf.

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Tiberio, Giustiniano <1979&gt. "Molecular dynamics simulations of liquid crystals and photoresponsive systems". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/462/.

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Wang, Dongsheng [Verfasser]. "Photoresponsive azobenzene/cyclodextrin supramolecular systems : from UV-light-responsive to visible-light-responsive / Dongsheng Wang". Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1130618366/34.

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Hammer, Christopher-Andrew [Verfasser], Josef [Gutachter] Wachtveitl e Alexander [Gutachter] Heckel. "Spectroscopic characterization of photoresponsive systems: from chromoproteins to switchable and caged compounds / Christopher-Andrew Hammer ; Gutachter: Josef Wachtveitl, Alexander Heckel". Frankfurt am Main : Universitätsbibliothek Johann Christian Senckenberg, 2019. http://d-nb.info/1177143429/34.

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Lin, Zi. "Dynamic behavior of light-responsive coacervates in microfluidic droplets". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0191.

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Abstract (sommario):
Les cellules vivantes sont des systèmes compartimentés dynamiques et hors équilibre. Reproduire cette compartimentation dynamique dans des systèmes artificiels revêt un intérêt grandissant en matière molle et biologie synthétique. Le phénomène de séparation de phase liquide-liquide (LLPS) est particulièrement crucial pour produire des compartiments dynamiques en biologie. Ce processus sous-tend la formation de condensats biomoléculaires dans les cellules et a été proposé jouer un rôle dans l'émergence des protocellules aux origines de la vie. In vitro, des microgouttelettes de coacervat, assemblées à partir de polyions de charges opposées dans l'eau, sont utilisées pour émuler ces LLPS bio-inspirées. La coacervation a été largement étudiée à l'équilibre thermodynamique, mais les études expérimentales de coacervats dynamiques restent rares. En raison de sa résolution spatiotemporelle, la lumière est particulièrement intéressante pour déclencher des comportements dynamiques dans des coacervats. La récente conception de coacervats photostimulables à base d’azobenzènes a ouvert la voie au contrôle dynamique de la dissolution et la formation de coacervats par la lumière. La dynamique de ces processus est encore mal comprise. L'objectif principal de cette thèse est d'étudier la dynamique de la dissolution, de la formation et de déformations de ces coacervats ADN/azobenzène photostimulables grâce à la microfluidique. Après avoir caractérisé la cinétique de la photoisomérisation des azobenzènes, nous produisons ces coacervats photostimulables à l'intérieur de gouttelettes eau-dans-huile par voie microfluidique. Nous étudions la relation entre la taille des coacervats, la concentration d'azobenzènes et leur isomérisation pour construire le diagramme de phase de la coacervation ADN/azobenzène. Nous examinons ensuite la cinétique de la dissolution et la reformation des coacervats sous lumière UV et visible, respectivement, à différentes tailles de coacervats et intensités lumineuses pour déchiffrer le mécanisme des deux processus. Enfin, nous démontrons que des déformations complexes des coacervats émergent dans des conditions optimales de co-illumination
Living cells are dynamic compartmentalized systems that operate under non-equilibrium conditions. Emulating such dynamic compartmentalization in artificial systems is gaining attention in soft matter and bottom-up synthetic biology. Liquid-liquid phase separation (LLPS) is particularly key to produce dynamic compartments in biology. This phenomenon underlies the formation of biomolecular condensates in cells and has been hypothesized to play a role in the emergence of protocells at the origins of Life. In vitro, coacervate microdroplets assembled from oppositely charged polyions in water are used to emulate these bio-inspired LLPS processes. Coacervation has been extensively studied at thermodynamic equilibrium, but experimental investigations of dynamic coacervates remain scarce. Given its spatiotemporal resolution, light is particularly interesting to trigger dynamic behaviors in coacervate droplets. The recent design of light-responsive coacervates based on azobenzene photoswitches has opened avenues for dynamically controlling the dissolution and formation of coacervates with light. The dynamics of these processes are yet poorly understood. The main objective of this thesis is to investigate the dynamics of light-actuated DNA/azobenzene coacervate decay, growth and deformations using droplet-based microfluidics. After characterizing the azobenzene photoisomerisation kinetics, we produce photoswitchable coacervates within water-in-oil droplets using microfluidics. We study the relationship between coacervate size, azobenzene concentration and isomerization to build the phase diagram of DNA/azobenzene coacervation. We then investigate the kinetics of coacervate dissolution and reformation under UV and visible light, respectively, at varying coacervate sizes and light intensities to decipher the mechanism of the two processes. Ultimately, we demonstrate complex non-equilibrium coacervate deformations under optimal co-illumination conditions
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Cicciarelli, Bradley A. (Bradley Adam). "Dynamics in a photoresponsive surfactant system". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39349.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2007.
Includes bibliographical references.
The study of surface tension and other surface properties is motivated by the large number of industrially relevant processes involving interfaces, such as coating, detergency, printing, foams, and so forth. These surface properties become increasingly important as the length scale of the system is reduced (as in microfluidic devices). Recently, much research has been focused on developing surfactants which respond to a particular stimulus (such as temperature, pH, light, etc.), so that properties such as surface tension and viscosity can be controlled using a convenient external trigger. Using light for this purpose has some advantages over other methods, as light can easily be focused and patterned (using optical lenses, filters, and masks) to give excellent precision for changing solution properties in a targeted area. A nonionic photoresponsive surfactant has been developed which incorporates the light-sensitive azobenzene group into its hydrophobic tail. Cis-trans photo-isomerization of this group causes a change in the structure of the surfactant molecule which alters its aggregation state in bulk solution and its adsorption capacity at an air-water interface.
(cont.) NMR studies indicate that a solution removed from light for an extended period of time is comprised almost entirely of the trans isomer, while samples exposed to light of fixed wavelength eventually reach a photostationary state containing significant amounts of both isomers, with UV illumination producing a mixture dominated by the cis isomer. Surface pressure measurements of adsorbed monolayers of the surfactant under various illumination conditions were made using a Langmuir film balance. The results indicate that adsorbed cis surfactant exerts a greater surface pressure than the adsorbed trans isomer, and that any cis present in a saturated layer tends to dominate the surface pressure behavior of the film. Fluorescence experiments were used to study the aggregation behavior of the surfactant in aqueous solution. The results suggest that the trans and cis isomers segregate into separate, co-existing aggregate phases and that the critical concentration associated with the onset of aggregation is very different for the two isomers. In measurements performed well above the CMC. the dynamic surface tension of surfactant solutions following the creation of a fresh interface was found to depend strongly on the illumination state of the sample, though the same equilibrium tension was reached in all cases.
(cont.) The observed dynamic behavior is consistent with a mechanism in which the cis and trans isomers present in the mixtures compete for adsorption at the air/water interface. Diffusion models were developed to estimate the time scales expected for surfactant adsorption and surface tension relaxation in these systems. These models account for the role of aggregates in the adsorption process, and consider limiting behavior for three aggregate properties: mobility, dissolution rate, and ability to incorporate into the interface. Good agreement is found between the model predictions and the experimentally observed relaxation time scales. The results suggest that trans-rich aggregates are important to the adsorption of trans surfactant, but that aggregates play little or no role in the adsorption of the cis isomer. In other experiments, high-intensity illumination focused on a surface saturated with surfactant was used to drive photoisomerization of adsorbed surfactant, resulting in rapid, substantial changes in surface tension. These changes are consistent with proposed conformations of the adsorbed surfactant, and with earlier monolayer studies.
by Bradley A. Cicciarelli.
Ph.D.
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Nagy, Zsuzsanna tamara. "Synthesis of self-organized dendrimers and dendronized nanohybrids and their physical properties". Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAE020/document.

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Pour ce travail de thèse, nous nous sommes intéressés dans une première partie à la conception et à la synthèse de nouveaux matériaux multifonctionnels (LC, photosensible, systèmes moléculaires dendritiques) capables d'être élaborés en films minces anisotropes et doués de propriétés photo-induites. Nous avons réalisé l'étude complète des propriétés mésomorphes de ces nouveaux matériaux et de dérivés structuraux (en fonction de la connectivité dendritique intrinsèque) par la diffraction des rayons X aux petits angles; l’étude de leurs propriétés optiques a également été effectuée. Dans une seconde partie, nous avons fonctionnalisé des nanoparticules d'or avec des ligands dendritiques mésogènes afin d'organiser ces particules dans des structures mésomorphes. Les objectifs principaux de cette partie sont tout d’abord la synthèse d'une "bibliothèque" de nanoparticules mésomorphes dendronisées, et ensuite la caractérisation de réseaux simples formée par l’auto-assemblage des particules précédentes
The need to expand further the range of mesomorphic organization, develop original materials where different functionalities can be added (i.e. multifunctional), and to design “multitask materials” with tunable properties are particularly interesting and crucial challenges for potential uses in future technologies. On the one hand, we focused on the design and synthesis of multifunctional materials (liquid crystalline, dendritic, photoresponisve) which are suitable for making thin films where photoinduced optical anisotropy and surface relief gratings can be generated. The mesomorphic behaviour of these dendrimers was investigated and also their optical properties. On the other hand, we grafted structurally related protodendritic mesogenic ligands to monodisperse gold nanoparticles to elaborate liquid crystalline hybrids in order to self-organize NPs in periodic arrays. A set of dendronized gold nanohybrids was synthesized to carry out this study
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Liu, Yazhao. "Photo-responsive systems in aqueous solution : from model polyelectrolytes to polyelectrolyte-surfactant complexes". Thesis, Strasbourg, 2021. http://www.theses.fr/2021STRAE007.

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Cette thèse vise à concevoir, synthétiser et étudier des systèmes photo-stimulables modèles en solution aqueuse formés à partir de polyélectrolytes (PEs) et de tensioactifs. La photosensibilité est liée à la présence de chromophores azobenzène (Azo) qui subissent une isomérisation trans → cis sous irradiation UV. Nous avons considéré dans un premier temps un PE hydrophile sur lequel nous avons greffé des groupements Azo. Ce système forme de agrégats globulaires en solution en raison du collapse des chaînes et des associations intermoléculaires. La taille des agrégats varie sous irradiation UV. Elle dépend également de la masse molaire des PEs et du taux de greffage des groupements Azo. Nous avons considéré dans un second temps des tensioactifs dans lesquels des groupements Azo ont été introduits (Azo-tensioactifs). Nous avons étudié leur complexation avec des PEs de charge opposée. Ces systèmes s’organisent en colliers de perles. Les polyions décorent les micelles et pénètrent à l’intérieur de celles-ci (co-micellisation). Sous irradiation UV, la taille des perles diminue sans vraiment modifier l’organisation des complexes. Nous nous sommes enfin intéressés à l’auto-assemblage d’Azo-tensioactifs et de co-tensioactifs. Ce mélange conduit à la formation des micelles allongées et à la création d’un gel. Sous irradiation UV, on observe une transition gel - fluide. L’origine ce phénomène est lié à un changement morphologique des agrégats micellaires (micelles allongées - micelles globulaires)
This thesis aims at designing, synthesizing and characterizing model photo-responsive systems in aqueous solution. These systems are based on polyelectrolytes (PEs) and surfactants. The photo-sensitivity arises from the presence of azobenzene (Azo) groups that undergo a transition from a trans to a cis isomer. We first considered a hydrophilic PE on which we grafted Azo groups. This system forms globular aggregates in solution due to chains collapse and intermolecular associations. The size of the aggregates varies under UV irradiation. It also depends on the molar mass of the PEs and the Azo content. We then considered surfactants in which Azo groups have been introduced (Azo-surfactants). We studied their complexation with oppositely charged PEs. These systems show a pearl necklace organization. The PEs decorate the micelles and penetrate inside (co-micellisation). Under UV irradiation, the size of the pearls decreases without really modifying the general organization of the complexes. Finally, we were interested in the self-assembly of Azo-surfactants and co-surfactants. This mixture leads to the formation of wormlike micelles and the creation of a gel. Under UV irradiation, a gel - fluid transition is observed. The origin of this phenomenon is linked to a morphological transition of the micellar aggregates (wormlike micelles - globular micelles)
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Capitoli di libri sul tema "Photoresponsive systems"

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Mellerup, Soren K., e Suning Wang. "Photoresponsive Organoboron Systems". In Main Group Strategies towards Functional Hybrid Materials, 47–77. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119235941.ch3.

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Qu, Da-Hui, Wen-Zhi Wang e He Tian. "Photoresponsive Host-Guest Nanostructured Supramolecular Systems". In Functional Organic and Hybrid Nanostructured Materials, 113–63. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527807369.ch4.

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Irie, M. "Photoresponsive polymers: reversible control of polymer conformation in solution and gel phases". In Applied Photochromic Polymer Systems, 174–206. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-3050-9_5.

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Uchida, Kingo, Ryo Nishimura, Hiroyuki Mayama, Tsuyoshi Tsujioka, Satoshi Yokojima e Shinichiro Nakamura. "Biomimetic Functions by Microscopic Molecular Reactions in Macroscopic Photoresponsive Crystalline System". In Photosynergetic Responses in Molecules and Molecular Aggregates, 405–25. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5451-3_24.

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Mahi, A. "Nonlinear Plasmonic Photoresponse of Field Effect Transistors at Terahertz High Irradiation Intensities". In Smart Innovation, Systems and Technologies, 213–19. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21009-0_20.

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Norikane, Yasuo, Koichiro Saito e Youfeng Yue. "Crawling and Bending Motions of Azobenzene Derivatives Based on Photoresponsive Solid–Liquid Phase Transition System". In Photosynergetic Responses in Molecules and Molecular Aggregates, 465–78. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5451-3_27.

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Vacha, Martin, e Shuzo Hirata. "Single-Molecule Level Study and Control of Collective Photoresponse in Molecular Complexes and Related Systems". In Photosynergetic Responses in Molecules and Molecular Aggregates, 515–35. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5451-3_30.

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"- Photoresponsive Polymers for Ocular Drug Delivery". In Ocular Drug Delivery Systems, 400–417. CRC Press, 2012. http://dx.doi.org/10.1201/b12950-24.

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Wells, Laura, e Heather Sheardown. "Photoresponsive Polymers for Ocular Drug Delivery". In Ocular Drug Delivery Systems, 383–400. CRC Press, 2012. http://dx.doi.org/10.1201/b12950-26.

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Miyake, Keita, Keiji Fushimi e Rei Narikawa. "The Diversity of Cyanobacterial Photoresponsive Systems". In Green Science and Technology, 116–26. CRC Press, 2019. http://dx.doi.org/10.1201/9780367814953-8.

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Atti di convegni sul tema "Photoresponsive systems"

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Chen, Wei, Danhao Wang, Yang Kang, Xin Liu, Shi Fang, Yuanmin Luo e Haiding Sun. "Achieving Bipolar Photoresponse in III-Nitride Nanowires for Encrypted Optical Communication". In CLEO: Applications and Technology, ATu4J.1. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.atu4j.1.

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We construct a spectral-distinctive photodetector based on p-AlGaN/n-Si nanowires modified with carbon layer, where the carbon layer effectively regulates the surface band bending of the nanowires, further successfully applying to the encrypted optical communication system. Key words: III-nitride nanowires, bipolar photoresponse, encrypted optical communication, surface band bending
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Zari, E., S. Chen, D. Dini e F. Rodriguez y. Baena. "Photoresponsive Valves for Soft Robotic Actuation". In The Hamlyn Symposium on Medical Robotics, 113–14. The Hamlyn Centre Imperial College London, 2024. http://dx.doi.org/10.31256/hsmr2024.57.

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In the growing field of soft robotics, researchers are continuously exploring new ways to make robots move. A promising approach involves incorporating materials that react to stimuli like pH, temperature, light, and magnetic field into soft robots to achieve better control and manipulation [1]. Among these intelligent materials, light-responsive hydrogels have garnered significant attention [2]. One example is the copolymerization of PNIPAM with spiropyran, a photoresponsive molecule that transitions to a hydrophobic state upon illumination, leading to the shrinkage of the hydrogel [3]. This light-triggered response has the potential to enable non-invasive, cost-effective, and remotely controlled actuation. In the medical field, hydrogels that respond to light could be used to develop advanced drug delivery systems and novel actuation strategies for soft endoluminal robots, enhancing safety and efficacy in navigating the human body. While light-responsive hydrogels have been used to create microvalves for microfluidic devices [4], their translation to the macroscale remains largely unexplored. Here, we present a novel method for designing and fabricating photoresponsive valves embedded within soft channels for controlling soft robotic actuators. The characterization of the photoresponsive valves’ response time was investigated and showed promising results
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3

Torres, Yanira, Timothy White, Amber McClung e William Oates. "Photoresponsive Azobenzene Liquid Crystal Polymer Networks: In Situ Photogenerated Stress Measurement". In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3656.

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Azobenzene liquid crystal polymers and polymer networks are adaptive materials capable of converting light into mechanical work. Often, the photomechanical output of the azobenzene liquid crystal network (azo-LCN) is observed as a bending cantilever. The response of these materials can be either static (e.g. a simple bending cantilever) or dynamic (e.g. oscillating cantilever of 20–270 Hz). The resulting photomechanical output is dependent upon the domain orientation of the polymer network and the wavelength and polarization of the actinic light. Polydomain azobenzene liquid crystal polymer networks, which have the capability of bending both backwards and forwards with the change of polarization angle, are of particular interest. In the current study, three azo-LCNs are compared — two of them are equivalent in all respects except for one contains pendant azobenzene mesogens (1azo, azo-monoacrylate) and the other contains crosslinked azobenzene mesogens (2azo, azo-diacrylate). The third specimen has a combination of both mesogens. The mechanical behavior at different temperatures and examination of structure-property relationships in the polymerization process, including curing temperatures and liquid crystal cell alignment rubbing methods, were explored. Using dynamic mechanical analysis (DMA) the mechanical properties and the photogenerated stress and strain in the polymer are examined. It is found the differences in chemistry do correlate to small variation in the speed of photodirected bending, elastic modulus, and glass transition temperature. Despite these differences, all three azo-LCNs display nearly equivalent photogenerated stresses.
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4

Ikeda, Tomiki, e Osamu Tsutsumi. "Liquid Crystalline Materials for Photonics: Optical Switching by Means of Photochemical Phase Transition of Liquid-Crystalline Azobenzene Films". In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.wd63.

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Isothermal phase transition of liquid crystals (LCs) can be induced reversibly by photochemical reaction of guest molecules incorporated into the LC phase at concentrations of 1 ~ 5 mol%. Such photoresponsive molecules as azobenzene and spiropyran derivatives have been proved to be effective guest molecules to bring about the photochemical phase transition. 1-5 The mechanism of the photochemical phase transition is interpreted in terms of the change in the molecular shape of the guest molecules by the photochemical reaction. For example, trans-azobenzenes are rod-like shape, stabilizing the LC phase, while cis-azobenzenes are bent, destabilizing the LC phase. When the trans-azobenzene/nematic (N) LC mixtures are irradiated to cause trans-cis photoisomerization of the guest molecules, the LC phase of the mixtures is destabilized in accumulation of the cis form and the N to isotropic (I) phase transition temperature (tNI) is lowered. When tNI is lowered below the irradiation temperature, N-I phase transition of the guest/host mixture is induced isothermally. This process is reversible, and cis-trans back isomerization restores the initial N phase. Time-resolved measurements by the use of a pulsed laser have revealed that the photochemical N-I phase transition takes place in the time region of 50 ~ 200 ms for the nematic hosts of low-molecular-weight (LMW) as well as polymeric LCs.6,7 Propagation of perturbation in the form of the trans-cis isomerization of the guest molecules may require a relatively long time in the LC systems.
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5

Wang, Duo Yuan, Ling Zhi Hu, Min Xue Hu, Hui Zhu He, Li Zeng Zhao, Zhen Zhong Lu e Yu Xin Nie. "Photon-Gated Spectral Hole Burning in Mixed Meso-Phenyl-Tetrabenzoporphyrinato-Zinc/Aromatic Cyanide System and the Hole Filling Induced by Gating Beam". In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.thf3.

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Photon-gated organic materials have been received great attention in the frequency domain optical storage, because of the high photoresponsive ability, the convenience of preparating film and controllable composition of materials. However, the dependence of the frequency for hole burning efficiency[1] and the hole width to be broadened accomponying with rising working temperature for hole burning[2] set up a limitation for the optical storage density.
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6

Yu, Meng-Ju, Peter Moroshkin e Jimmy Xu. "Dynamic Symmetry-Breaking and Transverse Photo Response". In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jw4a.6.

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A transverse photoresponse to a dynamic symmetry-breaking by an external current is investigated in a structurally symmetric plasmonic system. The results indicate optical angular momentum transfer to free electrons via a spin-momentum locking mechanism availed in surface plasmon polaritons.
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7

But, Andrii V., Valerij P. Mygal e Ivan V. Bodnar. "Spatial-temporal order of the photoresponse from the sensor materials". In SPIE Optical Systems Design, a cura di Laurent Mazuray, Rolf Wartmann, Andrew P. Wood, Marta C. de la Fuente, Jean-Luc M. Tissot, Jeffrey M. Raynor, Tina E. Kidger et al. SPIE, 2012. http://dx.doi.org/10.1117/12.981179.

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8

Malek, M. F., S. A. Arbain, M. H. Mamat, M. Z. Sahdan, M. Z. Musa, Z. Khusaimi, M. Rusop e A. S. Rodzi. "Photoresponse characteristics of nanostructured aluminum doped Zinc oxide thin films". In 2011 International Conference on Electronic Devices, Systems and Applications (ICEDSA). IEEE, 2011. http://dx.doi.org/10.1109/icedsa.2011.5959097.

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9

Vaughan, Gerald L. "Photoresponsive control of color, albedo, and structure in lizard skin: a smart functional system". In 1996 Symposium on Smart Structures and Materials, a cura di Andrew Crowson. SPIE, 1996. http://dx.doi.org/10.1117/12.232158.

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Yang, Yi, Yuelin Wang, Shixing Chen e Tie Li. "Calibrate Silicon Nanowires Field Effect Transistor Sensor with its Photoresponse". In 2021 IEEE 16th International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2021. http://dx.doi.org/10.1109/nems51815.2021.9451530.

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