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Articles de revues sur le sujet « Nanoengineered thin films »

Auteur : Grafiati
Publié le 12 octobre 2024

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1

Sangle, Abhijeet L., Oon Jew Lee, Ahmed Kursumovic, Wenrui Zhang, Aiping Chen, Haiyan Wang et Judith L. MacManus-Driscoll. « Very high commutation quality factor and dielectric tunability in nanocomposite SrTiO3 thin films with Tc enhanced to >300 °C ». Nanoscale 10, no 7 (2018) : 3460–68. http://dx.doi.org/10.1039/c7nr06991j.

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We report on nanoengineered SrTiO3–Sm2O3 nanocomposite thin films with the highest reported values of commutation quality factor (CQF or K-factor) of >2800 in SrTiO3 at room temperature.
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Tan, Hui, Obiefune K. Ezekoye, James van der Schalie, Mark W. Horn, Akhlesh Lakhtakia, Jian Xu et William D. Burgos. « Biological Reduction of Nanoengineered Iron(III) Oxide Sculptured Thin Films ». Environmental Science & ; Technology 40, no 17 (septembre 2006) : 5490–95. http://dx.doi.org/10.1021/es060388j.

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Demirel, M. C., E. So, T. M. Ritty, S. H. Naidu et A. Lakhtakia. « Fibroblast cell attachment and growth on nanoengineered sculptured thin films ». Journal of Biomedical Materials Research Part B : Applied Biomaterials 81B, no 1 (2007) : 219–23. http://dx.doi.org/10.1002/jbm.b.30656.

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Correa-Duarte, Miguel A, Adam Kosiorek, Witold Kandulski, Michael Giersig et Verónica Salgueiriño-Maceira. « Nanoengineered Polymeric Thin Films by Sintering CNT-Coated Polystyrene Spheres ». Small 2, no 2 (février 2006) : 220–24. http://dx.doi.org/10.1002/smll.200500336.

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Fang, Hui, Kenta Matsumoto, Takashi Sumigawa et Takayuki Kitamura. « Anisotropic Elastic Properties of Chiral Sculptured Thin Films at Micro-Scale Evaluated by Resonance Frequency Spectra ». Key Engineering Materials 645-646 (mai 2015) : 9–14. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.9.

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Chiral sculptured thin films (STFs) Glancing-angle deposition (GLAD) thin films are nanoengineered to meet the requirements of a variety of applications such as micro filters, sensors, and waveguides due to their unique frequency characteristics which cannot be achieved by conventional solid materials. For the design, it is necessary to understand the elastic properties of STFs. To facilitate this, we report on our newly developed advanced micro-scale vibration testing process. In the testing, specially designed micro-specimens with surface areas of tens by tens of microns are excited using a piezoelectric (PZT) actuator and the resonance frequencies are detected by a laser device in the vertical or lateral directions successfully. The anisotropy elastic modulus of STFs composed of helical nanosprings are identified on the basis of vibration testing. The thin film shows strong characteristic anisotropy that the solid one hardly can attain. The micro-scale testing technique can be extended to other materials and microstructures.
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Bae, Jung Hyeon, Do Kyung Kim, Tae Hoon Jeong et Hyun Jae Kim. « Crystallization of amorphous Si thin films by the reaction of MoO3/Al nanoengineered thermite ». Thin Solid Films 518, no 22 (septembre 2010) : 6205–9. http://dx.doi.org/10.1016/j.tsf.2010.03.175.

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Paul, Dilip K. « Sculptured Thin Films : Nanoengineered Morphology and Optics Sculptured Thin Films : Nanoengineered Morphology and Optics , Akhlesh Lakhtakia and Russell Messier , SPIE Press, Bellingham, WA, 2005. $75.00 (299 pp.). ISBN 0-8194-5606-3 ». Physics Today 59, no 4 (avril 2006) : 70–72. http://dx.doi.org/10.1063/1.2207044.

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González, Jesús, Jader González, Fernando Durán, Carlos Salas et Jorge Gómez. « Effect of the Spatially-Varied Electron Mean Free Path on Vortex Matter in a Superconducting Pb Island Grown on Si (111) ». Condensed Matter 8, no 3 (5 septembre 2023) : 77. http://dx.doi.org/10.3390/condmat8030077.

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In this work we report theoretical calculations of a superconducting island in a strong vortex confinement regime. The obtained results reveal the evolution of the superconducting condensate with an applied magnetic field, depending on the spatial profile of the electron mean-free path in the sample. The results of this study provide an insight about the emergent superconducting properties under such conditions, using the Ginzburg-Landau numerical simulations where spatial variation of thickness of the island and the corresponding variation of the mean free path, omnipresent in similar structures of Pb grown on Si (111), are taken into account. These results offer a new route to tailor superconducting circuits by nanoengineered mean free path, using for example the controlled ion-bombardment on thin films, benefiting from the here shown impact of the spatially-varying mean free path on the vortex distribution, phase of superconducting order parameter, and the critical fields.
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Ghasemi, Masih, P. K. Choudhury et Arash Dehzangi. « Nanoengineered thin films of copper for the optical monitoring of urine – a comparative study of the helical and columnar nanostructures ». Journal of Electromagnetic Waves and Applications 29, no 17 (4 août 2015) : 2321–29. http://dx.doi.org/10.1080/09205071.2015.1070107.

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Honciuc, Andrei, Oana-Iuliana Negru et Mirela Honciuc. « Interfacing Langmuir–Blodgett and Pickering Emulsions for the Synthesis of 2D Nanostructured Films : Applications in Copper Ion Adsorption ». Nanomaterials 14, no 9 (6 mai 2024) : 809. http://dx.doi.org/10.3390/nano14090809.

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This research focuses on developing a 2D thin film comprising a monolayer of silica nanoparticles functionalized with polyethyleneimine (PEI), achieved through a novel integration of Langmuir–Blodgett (L-B) and Pickering emulsion techniques. The primary aim was to create a nanostructured film that exhibits dual functionality: iridescence and efficient metal ion adsorption, specifically Cu(II) ions. The methodology combined L-B and Pickering emulsion polymerization to assemble and stabilize a nanoparticle monolayer at an oil/water interface, which was then polymerized under UV radiation to form an asymmetrically structured film. The results demonstrate that the film possesses a high adsorption efficiency for Cu(II) ions, with the enhanced mechanical durability provided by a reinforcing layer of polyvinyl alcohol/glycerol. The advantage of combining L-B and Pickering emulsion technology is the ability to generate 2D films from functional nanoparticle monolayers that are sufficiently sturdy to be deployed in applications. The 2D film’s practical applications in environmental remediation were confirmed through its ability to adsorb and recover Cu(II) ions from aqueous solutions effectively. We thus demonstrate the film’s potential as a versatile tool in water treatment applications owing to its combined photonic and adsorptive properties. This work paves the way for future research on the use of nanoengineered films in environmental and possibly photonic applications focusing on enhancing the film’s structural robustness and exploring its broader applicability to other pollutants and metal ions.
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Frost-Jensen Johansen, Nicolai, Leon Mishnaevsky, Arash Dashtkar, Neil A. Williams, Søren Fæster, Alessio Silvello, Irene Garcia Cano et Homayoun Hadavinia. « Nanoengineered Graphene-Reinforced Coating for Leading Edge Protection of Wind Turbine Blades ». Coatings 11, no 9 (13 septembre 2021) : 1104. http://dx.doi.org/10.3390/coatings11091104.

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Possibilities of the development of new anti-erosion coatings for wind turbine blade surface protection on the basis of nanoengineered polymers are explored. Coatings with graphene and hybrid nanoreinforcements are tested for their anti-erosion performance, using the single point impact fatigue testing (SPIFT) methodology. It is demonstrated that graphene and hybrid (graphene/silica) reinforced polymer coatings can provide better erosion protection with lifetimes up to 13 times longer than non-reinforced polyurethanes. Thermal effects and energy dissipation during the repeated soft impacts on the blade surface are discussed.
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Panfilova, Ekaterina V., et Elena N. Galaganova. « Neural Network modeling of Thin Films Deposition Processes in the Master’s Degree Programs “Electronics and Nanoelectronics” and “Nanoengineerig” ». IOP Conference Series : Materials Science and Engineering 781 (5 mai 2020) : 012016. http://dx.doi.org/10.1088/1757-899x/781/1/012016.

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Machado, Marina, Federico Baiutti, Lucile Bernadet, Alex Morata, Marc Nuñez, Jan Pieter Ouweltjes, Fabio C. Fonseca, Marc Torrell et Albert Tarancon. « Functional thin films as cathode/electrolyte interlayers : a strategy to enhance the performance and durability of solid oxide fuel cell ». Journal of Materials Chemistry A, 2022. http://dx.doi.org/10.1039/d2ta03641j.

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Electrochemical devices such as solid oxide fuel cells (SOFC) may greatly benefit from the implementation of nanoengineered thin-film multifunctional layers providing, alongside enhanced electrochemical activity, improved mechanical, and long-term stability....
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Vayssieres, Lionel, et Arumugam Manthiram. « 3-D Nanoengineering of Metal Oxides and Oxyhydroxides by Aqueous Chemical Growth ». MRS Proceedings 739 (2002). http://dx.doi.org/10.1557/proc-739-h8.10.

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ABSTRACTAdvanced nanoparticulate thin films of transition metal oxides consisting of nanorods with different orientations onto various substrates have been successfully grown by aqueous chemical growth without template, surfactant, or applied electric/magnetic field. The synthesis involves the aqueous condensation of metal ions from solutions of metal salts or metal complexes. Such low-cost fabrication of nanoengineered 3-D arrays consisting of 1-D nanorods of iron oxide (hematite), zinc oxide (zincite), and manganese oxyhydroxide (manganite) with parallel and perpendicular orientations onto various substrates are presented.
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Mossayebi, Zahra, Sadegh Shabani, Christopher D. Easton, Paul A. Gurr, Ranya Simons et Greg G. Qiao. « Amphiphilic Nanoscale Antifog Coatings : Improved Chemical Robustness by Continuous Assembly of Polymers ». Small, 11 juillet 2024. http://dx.doi.org/10.1002/smll.202402114.

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AbstractDesigning effective antifog coatings poses challenges in resisting physical and chemical damage, with persistent susceptibility to decomposition in aggressive environments. As their robustness is dictated by physicochemical structural features, precise control through unique fabrication strategies is crucial. To address this challenge, a novel method for crafting nanoscale antifog films with simultaneous directional growth and cross–linking is presented, utilizing solid‐state continuous assembly of polymers via ring‐opening metathesis polymerization (ssCAPROMP). A new amphiphilic copolymer (specified as macrocross–linker) is designed by incorporating polydimethylsiloxane, poly(2‐(methacryloyloxy)ethyl) trimethylammonium chloride (PMETAC), and polymerizable norbornene (NB) pendant groups, allowing ssCAPROMP to produce antifog films under ambient conditions. This novel approach results in distinctive surface and molecular characteristics. Adjusting water‐absorption and nanoscale assembly parameters produced ultra‐thin (≤100 nm) antifog films with enhanced durability, particularly against strong acidic and alkaline environments, surpassing commercial antifog glasses. Thickness loss analysis against external disturbances further validated the stable surface‐tethered chemistries introduced through ssCAPROMP, even with the incorporation of minimal content of cross–linkable NB moieties (5 mol%). Additionally, a potential zwitter‐wettability mechanism elucidates antifog observations. This work establishes a unique avenue for exploring nanoengineered antifog coatings through facile and robust surface chemistries.
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Namavar, Fereydoon, Renat F. Sabirianov, Jiaming Zhang, Chin Li Cheung, Charles Blatchley, Raheleh Miralami, John G. Sharp et Kevin L. Garvin. « Nanostructurally Designed Ultra-hydrophilic Hard Ceramic Oxide Coatings for Orthopaedic Application ». MRS Proceedings 1578 (2013). http://dx.doi.org/10.1557/opl.2013.880.

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ABSTRACTThis paper addresses the application of engineered nanocrystalline ultrahydrophilic titanium oxide films to artificial orthopaedic implants. Titanium (Ti) is the material of choice for orthopaedic applications and has been used for over fifty years because of its known bio-compatibility. Recently it was shown that biocompatibility of Ti metal is due to the presence of a thin native sub-stoichiometric titanium oxide layer [1] which enhances the adsorption of mediating proteins on the surface thus enhancing cell adhesion and growth [2,3,4]. Improving the quality of surface oxide, i.e. fabricating stoichiometric oxides as well as nanoengineering the surface topology that matches the dimensions of adhesive proteins, is crucial for the increase of protein adsorption [2] and, as a result, the biocompatibility of Ti implant materials. We have fabricated ultrahydrophilic nano-crystalline transparent films of anatase phase of titania (TiO2) by ion beam assisted deposition (IBAD) processes in an ultrahigh vacuum system. Source material was 99.9% pure rutile TiO2. Various ion beam conditions were used to produce these coatings with different grain sizes (4 to 70 nm) that affect the wettability, roughness, and the mechanical and optical properties of the coating [5]. Our biological experiments have shown that biocompatibility of these ultrahydrophilic nanoengineered TiO2 coatings are superior to commonly used orthopaedic titanium and even hydroxyapatite.
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Brognara, Andrea, Ankush Kashiwar, Chanwon Jung, Xukai Zhang, Ali Ahmadian, Nicolas Gauquelin, Johan Verbeeck et al. « Tailoring Mechanical Properties and Shear Band Propagation in ZrCu Metallic Glass Nanolaminates Through Chemical Heterogeneities and Interface Density ». Small Structures, 19 mai 2024. http://dx.doi.org/10.1002/sstr.202400011.

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The design of high‐performance structural thin films consistently seeks to achieve a delicate equilibrium by balancing outstanding mechanical properties like yield strength, ductility, and substrate adhesion, which are often mutually exclusive. Metallic glasses (MGs) with their amorphous structure have superior strength, but usually poor ductility with catastrophic failure induced by shear bands (SBs) formation. Herein, we introduce an innovative approach by synthesizing MGs characterized by large and tunable mechanical properties, pioneering a nanoengineering design based on the control of nanoscale chemical/structural heterogeneities. This is realized through a simplified model Zr24Cu76/Zr61Cu39, fully amorphous nanocomposite with controlled nanoscale periodicity (Λ, from 400 down to 5 nm), local chemistry, and glass–glass interfaces, while focusing in‐depth on the SB nucleation/propagation processes. The nanolaminates enable a fine control of the mechanical properties, and an onset of crack formation/percolation (>1.9 and 3.3%, respectively) far above the monolithic counterparts. Moreover, we show that SB propagation induces large chemical intermixing, enabling a brittle‐to‐ductile transition when Λ ≤ 50 nm, reaching remarkably large plastic deformation of 16% in compression and yield strength ≈2 GPa. Overall, the nanoengineered control of local heterogeneities leads to ultimate and tunable mechanical properties opening up a new approach for strong and ductile materials.
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Martinez-Calderon, Miguel, Baptiste Groussin, Victoria Bjelland, Eric Chevallay, Valentin N. Fedosseev, Marcel Himmerlich, Pierre Lorenz et al. « Hot electron enhanced photoemission from laser fabricated plasmonic photocathodes ». Nanophotonics, 17 octobre 2023. http://dx.doi.org/10.1515/nanoph-2023-0552.

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Abstract Photocathodes are key elements in high-brightness electron sources and ubiquitous in the operation of large-scale accelerators, although their operation is often limited by their quantum efficiency and lifetime. Here, we propose to overcome these limitations by utilizing direct-laser nanostructuring techniques on copper substrates, improving their efficiency and robustness for next-generation electron photoinjectors. When the surface of a metal is nanoengineered with patterns and particles much smaller than the optical wavelength, it can lead to the excitation of localized surface plasmons that produce hot electrons, ultimately contributing to the overall charge produced. In order to quantify the performance of laser-produced plasmonic photocathodes, we measured their quantum efficiency in a typical electron gun setup. Our experimental results suggest that plasmon-induced hot electrons lead to a significant increase in quantum efficiency, showing an overall charge enhancement factor of at least 4.5 and up to 25. A further increase in their efficiency was observed when combined with semiconductor thin-films deposited over the laser processed surfaces, pointing at potential pathways for further optimization. We demonstrate that simple laser-produced plasmonic photocathodes outperform standard metallic photocathodes, and can be directly produced in-situ at the electron gun level in vacuum environments and without any disruptive intervention. This approach could lead to unprecedented efficient and continuous operation of electron sources, and is useful in many applications across scientific disciplines requiring high average and peak current electron beams.
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Salles, Pol, Pamela Machado, Pengmei Yu et Mariona Coll. « Chemical synthesis of complex oxide thin films and freestanding membranes ». Chemical Communications, 2023. http://dx.doi.org/10.1039/d3cc03030j.

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Oxides offer unique physical and chemical properties that inspire rapid advances in materials chemistry to design and nanoengineer materials compositions and implement them in devices for a myriad of applications.
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Ruiz-Esparza, Guillermo U., Xichi Wang, Xingcai Zhang, Sofia Jimenez-Vazquez, Liliana Diaz-Gomez, Anne-Marie Lavoie, Samson Afewerki et al. « Nanoengineered Shear-Thinning Hydrogel Barrier for Preventing Postoperative Abdominal Adhesions ». Nano-Micro Letters 13, no 1 (janvier 2021). http://dx.doi.org/10.1007/s40820-021-00712-5.

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AbstractMore than 90% of surgical patients develop postoperative adhesions, and the incidence of hospital re-admissions can be as high as 20%. Current adhesion barriers present limited efficacy due to difficulties in application and incompatibility with minimally invasive interventions. To solve this clinical limitation, we developed an injectable and sprayable shear-thinning hydrogel barrier (STHB) composed of silicate nanoplatelets and poly(ethylene oxide). We optimized this technology to recover mechanical integrity after stress, enabling its delivery though injectable and sprayable methods. We also demonstrated limited cell adhesion and cytotoxicity to STHB compositions in vitro. The STHB was then tested in a rodent model of peritoneal injury to determine its efficacy preventing the formation of postoperative adhesions. After two weeks, the peritoneal adhesion index was used as a scoring method to determine the formation of postoperative adhesions, and STHB formulations presented superior efficacy compared to a commercially available adhesion barrier. Histological and immunohistochemical examination showed reduced adhesion formation and minimal immune infiltration in STHB formulations. Our technology demonstrated increased efficacy, ease of use in complex anatomies, and compatibility with different delivery methods, providing a robust universal platform to prevent postoperative adhesions in a wide range of surgical interventions.
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