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Search Results (7)

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Keywords = photomobile polymer films

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8 pages, 2213 KiB  
Article
Development of a Quartz-Based Photo-Mobile Polymer Film for Controlled Motion Triggered by Light or Heat
by Riccardo Castagna, Cristiano Riminesi, Maria Savina Pianesi, Simona Sabbatini, Andrea Di Donato, Gautam Singh, Oriano Francescangeli, Emma Cantisani, Paolo Castellini and Daniele Eugenio Lucchetta
Materials 2023, 16(8), 3046; https://doi.org/10.3390/ma16083046 - 12 Apr 2023
Cited by 1 | Viewed by 1673
Abstract
We have developed a photo-mobile polymer film, that combines organic and inorganic materials, to allow for controlled motion that can be triggered by light or heat. Our film is made using recycled quartz and consists of two layers: a multi-acrylate polymer layer and [...] Read more.
We have developed a photo-mobile polymer film, that combines organic and inorganic materials, to allow for controlled motion that can be triggered by light or heat. Our film is made using recycled quartz and consists of two layers: a multi-acrylate polymer layer and a layer containing oxidized 4-amino-phenol and N-Vinyl-1-Pyrrolidinone. The use of quartz in our film also gives it a high temperature resistance of at least 350 °C. When exposed to heat, the film moves in a direction that is independent of the heat source, due to its asymmetrical design. Once the heat source is removed, the film returns to its original position. ATR-FTIR measurements confirm this asymmetrical configuration. This technology may have potential applications in energy harvesting, due to the piezoelectric properties of quartz. Full article
(This article belongs to the Special Issue Advances in Photomobile Materials and Systems)
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7 pages, 1849 KiB  
Communication
Light-Controlled Rotational Speed of an Acoustically Levitating Photomobile Polymer Film
by Daniele Eugenio Lucchetta, Paolo Castellini, Milena Martarelli, Lorenzo Scalise, Giuseppe Pandarese, Cristiano Riminesi, Gautam Singh, Andrea Di Donato, Oriano Francescangeli and Riccardo Castagna
Materials 2023, 16(2), 553; https://doi.org/10.3390/ma16020553 - 6 Jan 2023
Cited by 5 | Viewed by 2153
Abstract
In this work, we study the light-induced changes of the rotational speed of a thin photomobile film using a single-axis acoustic levitator operating at 40 kHz. In our experiments, a 50 μm thick photomobile polymer film (PMP) is placed in one of the [...] Read more.
In this work, we study the light-induced changes of the rotational speed of a thin photomobile film using a single-axis acoustic levitator operating at 40 kHz. In our experiments, a 50 μm thick photomobile polymer film (PMP) is placed in one of the nodes of a stationary acoustic field. Under the action of the field, the film remains suspended in air. By externally perturbing this stable equilibrium condition, the film begins to rotate with its natural frequency. The rotations are detected in real time by monitoring the light of a low power He–Ne laser impinging on and reflected by the film itself. During the rotational motion, an external laser source is used to illuminate the PMP film; as a consequence, the film bends and the rotational speed changes by about 20 Hz. This kind of contactless long-distance interaction is an ideal platform for the development and study of many electro-optics devices in microgravity and low-friction conditions. In particular, we believe that this technology could find applications in research fields such as 3D dynamic displays and aerospace applications. Full article
(This article belongs to the Special Issue Advances in Photomobile Materials and Systems)
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7 pages, 2481 KiB  
Communication
Scotch-Tape and Graphene-Oxide Photomobile Polymer Film
by Riccardo Castagna, Andrea Di Donato, Rachele Castaldo, Roberto Avolio, Oriano Francescangeli and Daniele Eugenio Lucchetta
Photonics 2022, 9(9), 659; https://doi.org/10.3390/photonics9090659 - 15 Sep 2022
Cited by 2 | Viewed by 2219
Abstract
In this work, we report on the fabrication and photonic activation of a novel kind of photomobile polymer (PMP) film based mainly on a double layered asymmetric configuration. The PMP is cheap and extremely easy to make. It is made of PVC/isoprene tape [...] Read more.
In this work, we report on the fabrication and photonic activation of a novel kind of photomobile polymer (PMP) film based mainly on a double layered asymmetric configuration. The PMP is cheap and extremely easy to make. It is made of PVC/isoprene tape with a layer of graphene-oxide (GO) attached. Under illumination at different intensities, and with coherent and incoherent light sources, the bending of the PMP film changes considerably. In particular, we noticed a more efficient bending effect when the film is directly exposed to high light intensities or to NIR radiation in the case of incoherent light sources. For the exposure times used in our experiments, the process is completely reversible when the light source is switched off. Additionally, if we paint the side of the PVC tape exposed to light black, the film is not able to return to its starting position and the bending results are permanent. This suggests that the presence of the GO-layer is responsible for the restoration of the position of the PMP film. Full article
(This article belongs to the Section Optoelectronics and Optical Materials)
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10 pages, 2384 KiB  
Article
Light-Controlled Direction of Distributed Feedback Laser Emission by Photo-Mobile Polymer Films
by Daniele Eugenio Lucchetta, Andrea Di Donato, Oriano Francescangeli, Gautam Singh and Riccardo Castagna
Nanomaterials 2022, 12(17), 2890; https://doi.org/10.3390/nano12172890 - 23 Aug 2022
Cited by 12 | Viewed by 2664
Abstract
We report on the realization of Distributed Feedback (DFB) lasing by a high-resolution reflection grating integrated in a Photomobile Polymer (PMP) film. The grating is recorded in a recently developed holographic mixture basically containing halolakanes/acrylates and a fluorescent dye molecule (Rhodamine 6G). The [...] Read more.
We report on the realization of Distributed Feedback (DFB) lasing by a high-resolution reflection grating integrated in a Photomobile Polymer (PMP) film. The grating is recorded in a recently developed holographic mixture basically containing halolakanes/acrylates and a fluorescent dye molecule (Rhodamine 6G). The PMP-mixture is placed around the grating spot and a subsequent curing/photo-polymerization process is promoted by UV-irradiation. Such a process brings to the simultaneous formation of the PMP-film and the covalent link of the PMP-film to the DFB-grating area (PMP-DFB system). The PMP-DFB allows lasing action when optically pumped with a nano-pulsed green laser source. Moreover, under a low-power light-irradiation the PMP-DFB bends inducing a spatial readdressing of the DFB-laser emission. This device is the first example of a light-controlled direction of a DFB laser emission. It could represent a novel disruptive optical technology in many fields of Science, making feasible the approach to free standing and light-controllable lasers. Full article
(This article belongs to the Special Issue Advances in Nanomaterials for Optoelectronics)
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7 pages, 1155 KiB  
Article
Light-Induced Dynamic Holography
by Daniele Eugenio Lucchetta, Andrea Di Donato, Melania Paturzo, Gautam Singh and Riccardo Castagna
Micromachines 2022, 13(2), 297; https://doi.org/10.3390/mi13020297 - 14 Feb 2022
Cited by 6 | Viewed by 2235
Abstract
Holographic photomobile polymers (H-PMP) are a novel class of photomobile materials in which holograms can be optically recorded. They can be used in a large variety of applications, including optical switches and color selectors. In this work, we show one of the most [...] Read more.
Holographic photomobile polymers (H-PMP) are a novel class of photomobile materials in which holograms can be optically recorded. They can be used in a large variety of applications, including optical switches and color selectors. In this work, we show one of the most important properties of the photomobile film, which is the photophobicity of the unpolymerized parts of the photomobile mixture. In order to investigate this property, we recorded a transmission phase grating on an H-PMP film, and used a different experimental technique to measure the diffraction efficiency, surface tension, and mixture properties. The results allowed for a better understanding of the mechanism of the light-controlled bending observed in these compounds. Full article
(This article belongs to the Special Issue Feature Papers of Micromachines in Physics 2022)
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19 pages, 4346 KiB  
Article
Photo-Responsivity Improvement of Photo-Mobile Polymers Actuators Based on a Novel LCs/Azobenzene Copolymer and ZnO Nanoparticles Network
by Domenico Sagnelli, Marcella Calabrese, Olga Kaczmarczyk, Massimo Rippa, Ambra Vestri, Valentina Marchesano, Kristoffer Kortsen, Valentina Cuzzucoli Crucitti, Fulvia Villani, Fausta Loffredo, Carmela Borriello, Giuseppe Nenna, Mariacristina Cocca, Veronica Ambrogi, Katarzyna Matczyszyn, Francesco Simoni and Lucia Petti
Nanomaterials 2021, 11(12), 3320; https://doi.org/10.3390/nano11123320 - 7 Dec 2021
Cited by 7 | Viewed by 4009
Abstract
The efficiency of photomobile polymers (PMP) in the conversion of light into mechanical work plays a fundamental role in achieving cutting-edge innovation in the development of novel applications ranging from energy harvesting to sensor approaches. Because of their photochromic properties, azobenzene monomers have [...] Read more.
The efficiency of photomobile polymers (PMP) in the conversion of light into mechanical work plays a fundamental role in achieving cutting-edge innovation in the development of novel applications ranging from energy harvesting to sensor approaches. Because of their photochromic properties, azobenzene monomers have been shown to be an efficient material for the preparation of PMPs with appropriate photoresponsivity. Upon integration of the azobenzene molecules as moieties into a polymer, they act as an engine, allowing fast movements of up to 50 Hz. In this work we show a promising approach for integrating ZnO nanoparticles into a liquid crystalline polymer network. The addition of such nanoparticles allows the trapping of incoming light, which acts as diffusive points in the polymer matrix. We characterized the achieved nanocomposite material in terms of thermomechanical and optical properties and finally demonstrated that the doped PMP was better performing that the undoped PMP film. Full article
(This article belongs to the Special Issue Nanocomposite and Structured Liquid Crystals (LCs): Properties and Applications)
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12 pages, 5626 KiB  
Article
Plasmonic Photomobile Polymer Films
by Riccardo Castagna, Massimo Rippa, Francesco Simoni, Fulvia Villani, Giuseppe Nenna and Lucia Petti
Crystals 2020, 10(8), 660; https://doi.org/10.3390/cryst10080660 - 1 Aug 2020
Cited by 7 | Viewed by 3334
Abstract
In this work, we introduce the approaches currently followed to realize photomobile polymer films and remark on the main features of the system based on a biphasic structure recently proposed. We describe a method of making a plasmonic nanostructure on the surface of [...] Read more.
In this work, we introduce the approaches currently followed to realize photomobile polymer films and remark on the main features of the system based on a biphasic structure recently proposed. We describe a method of making a plasmonic nanostructure on the surface of photomobile films. The characterization of the photomobile film is performed by means of Dark Field Microscopy (DFM), Scanning Electron Microscopy (SEM), and Atomic Force Microscopy (AFM). Preliminary observations of the light-induced effects on the Localized Surface Plasmon Resonance are also reported. Full article
(This article belongs to the Special Issue A 10 Years Journey: Chemical, Physical, and Biological Properties and Applications of Crystals)
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