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Articles de revues sur le sujet « Artificial opal films »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 18 février 2022

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Samoilovich, Michail I., Svetlana M. Samoilovich, Andrey V. Guryanov et Michail Yu Tsvetkov. « Artificial opal structures for 3D-optoelectronics ». Microelectronic Engineering 69, n^o 2-4 (septembre 2003) : 237–47. http://dx.doi.org/10.1016/s0167-9317(03)00303-4.

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Lozano, G., L. A. Dorado, D. Schinca, R. A. Depine et H. Míguez. « Optical Analysis of the Fine Crystalline Structure of Artificial Opal Films ». Langmuir 25, n^o 22 (17 novembre 2009) : 12860–64. http://dx.doi.org/10.1021/la903077r.

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Fudouzi, Hiroshi. « Novel coating method for artificial opal films and its process analysis ». Colloids and Surfaces A : Physicochemical and Engineering Aspects 311, n^o 1-3 (décembre 2007) : 11–15. http://dx.doi.org/10.1016/j.colsurfa.2007.08.034.

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Ohshima, Shigetoshi. « Hetero-Epitaxial Growth of YBCO and MgB2 Thin Films on Decorated Substrates with Nano-Wires and Nano-Particles ». MRS Proceedings 1454 (2012) : 105–14. http://dx.doi.org/10.1557/opl.2012.1485.

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ABSTRACTSuperconducting NMR pickup coils have to have a low surface resistance (Rs) under a high magnetic field. One way of reducing the Rs of superconducting thin films is adding artificial pins to the films. We examined the hetero-epitaxial growth of MgB2and YBCO thin films on decorated sapphire and MgO substrates while using nano-wires and nano-particles to add pins to the films.We used ZnO nano-wire to add artificial grain boundary pins to MgB2 films. The tilted c-plane sapphire substrate with nano-step edges was used for these substrates. The terrace width with one lattice step edge can be controlled by changing the tilt angle. AFM images showed that the tilted c-plane sapphire substrate had straight nano-step edges. ZnO nono-wires were decorated on the nano-step edges by MOCVD, and then deposited on MgB2 films by sputtering. The Rs of the films was then measured with a sapphire rod resonator. The Rs of MgB2 thin films fabricated on the tilted c-plane sapphire substrate with ZnO nano-wires was lower than that of MgB2thin films on a conventional sapphire substrate under a high magnetic field.We used BaZrO3(BZO) nano-particles to add the artificial pins to YBCO thin films. The BZO particles on the MgO substrates were fabricated by laser deposition. The size and density of these particles were controlled with a pulse number of laser shot. YBCO thin films were formed on decorated MgO substrate by laser deposition. The Rs of YBCO thin films on the decorated MgO substrate was lower than that of the YBCO films formed on a conventional MgO substrate under a high magnetic field.We clarified that artificial pins in MgB2and YBCO thin films are useful for decreasing the Rs under a high magnetic field.

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Jonsson, Fredrik, Clivia M. Sotomayor Torres, Jörg Seekamp, Moritz Schniedergers, Anne Tiedemann, Jianhui Ye et Rudolf Zentel. « Artificially inscribed defects in opal photonic crystals ». Microelectronic Engineering 78-79 (mars 2005) : 429–35. http://dx.doi.org/10.1016/j.mee.2004.12.054.

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Akaiwa, Kazuaki, Norihiro Suzuki, Kentaro Kaneko et Shizuo Fujita. « Fabrication of Corundum-Structured α-(InFe)2O3 Alloy Films on Sapphire Substrates by Inserting α-Fe2O3 Buffer Layer ». MRS Proceedings 1494 (2013) : 221–25. http://dx.doi.org/10.1557/opl.2013.125.

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ABSTRACTWe successfully fabricated corundum-structured α-(InFe)2O3 alloy films on sapphire substrates by inserting α-Fe2O3 buffer layers. The ion compositions in the α-(In1-xFex)2O3 films, x, were artificially tuned for the entire range from 0 to 1 by changing the ion precursor composition in source solution. Magnetic measurements revealed that the α-(In1-xFex)2O3 (x = 0.13) alloy film showed ferromagnetism at 5 K.

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Chumakova, A. V., A. A. Mistonov, A. A. Vorobiev, A. P. Chumakov, N. A. Grigoryeva, N. A. Sapoletova, K. S. Napolskii, A. A. Eliseev et S. V. Grigoriev. « Formation of artificial opals viewed in situ by X-ray grazing insidence diffraction ». Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques 7, n^o 6 (novembre 2013) : 1234–39. http://dx.doi.org/10.1134/s1027451013130041.

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Gaponenko, N. V. « Sol–gel derived films in meso-porous matrices : porous silicon, anodic alumina and artificial opals ». Synthetic Metals 124, n^o 1 (octobre 2001) : 125–30. http://dx.doi.org/10.1016/s0379-6779(01)00447-7.

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Janda, Petr, Jan Valenta, Jean-Luc Rehspringer, Rodrigue R. Mafouana, Jan Linnros et Robert G. Elliman. « Modified spontaneous emission of silicon nanocrystals embedded in artificial opals ». Journal of Physics D : Applied Physics 40, n^o 19 (21 septembre 2007) : 5847–53. http://dx.doi.org/10.1088/0022-3727/40/19/008.

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Miralami, Raheleh, Laura Koepsell, Thyagaseely Premaraj, Bongok Kim, Geoffrey M. Thiele, J. Graham Sharp, Kevin L. Garvin et Fereydoon Namavar. « Comparing Biocompatibility of Nanocrystalline Titanium and Titanium-Oxide with Microcrystalline Titanium ». MRS Proceedings 1569 (2013) : 91–96. http://dx.doi.org/10.1557/opl.2013.804.

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ABSTRACTTitanium (Ti) is the material of choice for orthopaedic applications because it is biocompatible and encourages osteoblast ingrowth. It was shown that the biocompatibility of Ti metal is due to the presence of a thin native sub-stoichiometric titanium oxide layer which enhances the adsorption of mediating proteins on the surface [1]. The present studies were devised to evaluate the adhesion, survival, and growth of cells on the surface of new engineered nano-crystal films of titanium and titanium oxides and compare them with orthopaedic-grade titanium with microcrystals. The engineered nano-crystal films with hydrophilic properties are produced by employing an ion beam assisted deposition (IBAD) technique. IBAD combines physical vapor deposition with concurrent ion beam bombardment in a high vacuum environment to produce films (with 3 to 70 nm grain size) with superior properties. These films are “stitched” to the artificial orthopaedic implant materials with characteristics that affect the wettability and mechanical properties of the coatings.To characterize the biocompatibility of these nano-engineered surfaces, we have studied osteoblast function including cell adhesion, growth, and differentiation on different nanostructured samples. Cell responses to surfaces were examined using SAOS-2 osteoblast-like cells. We also studied a correlation between the surface nanostructures and the cell growth by characterizing the SAOS-2 cells with immunofluorescence and measuring the amount alizarin red concentration produced after 7 and 14 days. The number of adherent cells was determined by means of nuclei quantification on the nanocrystalline Ti, TiO2, and microcrystalline Ti and analysis was performed with Image J. Our experimental results indicated that nanocrystalline TiO2 is superior to both nano and microcrystalline Ti in supporting growth, adhesion, and proliferation. Improving the quality of surface oxide, i.e. fabricating stoichiometric oxides as well as nanoengineering the surface topology, is crucial for increasing the biocompatibility of Ti implant materials.

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Endo, Kazuhiro, Petre Badica, Shunichi Arisawa, Hiroshi Kezuka, Hidehito Nanto, Noriaki Ikenaga, Masahiro Seto, Hiroshi Saito et Tamio Endo. « Thin Film Composite Heterostructures of Oxide Multicomponent Perovskites for Electronics ». MRS Proceedings 1454 (2012) : 175–81. http://dx.doi.org/10.1557/opl.2012.1345.

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ABSTRACTOxide materials for electronics show recently significant progress. Among the most interesting are oxide composite heterostructures made of thin films. They are taking advantage of integration, anisotropy and synergetic concepts leading to new types of devices and functionalities. Remarkable is that, in the last few years, new devices and artificial materials showing new phenomena were demonstrated. At the same time, their synthesis, processing or fabrication is very often by complex, sophisticated, and, hence, by expensive methods. For further industrial implementation, deep understanding of the growth principles and concepts is required. On a higher level, understanding of the bi-directional relationship between the general and particular principles becomes important and deserves much attention. The immediate benefit is that knowledge on growth for one material can be transferred to another one. This may lead for search of less expensive but optimum technological approaches and can also lead to generation of new materials and devices. In our work we have analyzed the relationship between the particular and general growth principles for some oxide multicomponent perovskites. Materials used in our examples are Bi-Sr-Ca-Cu-O and YBa2Cu3O7, (Ca, Sr)CuO2, (Ca, Ba)CuO2 and Bi4Ti3O12. Presented thin films or heterostructures are with c-axis and non-c-axis orientations. We discuss and we review based on our results film-substrate lattice relationships, principles to control the growth mechanism, the morphology/roughness, the uniformity, and the stability domain and inter diffusion aspects.

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Naidu, Sonia, Chun Liu et George W. Scherer. « Novel hydroxyapatite-based consolidant and the acceleration of hydrolysis of silicate-based consolidants ». MRS Proceedings 1656 (18 juillet 2014) : 9–14. http://dx.doi.org/10.1557/opl.2014.712.

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ABSTRACTThis paper discusses the effectiveness of hydroxyapatite (HAP) as an inorganic consolidant for physically weathered Indiana Limestone, and as a coupling agent between limestone and a silicate consolidant. A double application is investigated, in which samples are coated with HAP followed by a commercially available silicate-based consolidant (Conservare® OH-100). To artificially weather limestone, a thermal degradation technique was utilized. Diammonium hydrogen phosphate (DAP) salt was reacted with limestone, alone and with cationic precursors, to produce HAP films. The dynamic elastic modulus, water sorptivity and tensile strength of the treated stones were evaluated. HAP was found to be an effective consolidant for weathered Indiana Limestone, and its performance was enhanced by addition of millimolar quantities of calcium chloride. However, HAP was not useful as a coupling agent; a double treatment with DAP is more effective than sequential treatment with DAP and Conservare®.

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Schäfer, Christian G. « Artificial opal films with switchable colors ». SPIE Newsroom, 3 décembre 2013. http://dx.doi.org/10.1117/2.1201311.005116.

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Comoretto, D., D. Cavallo, G. Dellepiane, R. Grassi, F. Marabelli, L. C. Andreani, C. J. Brabec, A. Andreev et A. A. Zakhidov. « Optical Studies of Artificial Opals as 3D Photonic Crystals ». MRS Proceedings 708 (2001). http://dx.doi.org/10.1557/proc-708-bb10.19.

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ABSTRACTArtificial opal films have been prepared by sedimentation of monodisperse silica spheres in water suspension. Atomic force microscope images show a triangular packing of the spheres at the surface of the films. The presence and the energy position of an optical pseudo gap in incidence-angle-dependent transmittance and reflectance spectra is observed and accounted for by theoretical calculations of the photonic band structure. These calculations indicate that the pseudo gap is due to the splitting of the photonic bands in the L point of the Brillouin zone. The spectroscopic data show additional loss structures due to both other features of the Brillouin zone and the diffraction of the light from the regular surface of the sample. The effect of the infiltration of opals with polydiacetylene solutions is also reported.

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Yu, Binlu, Yumeng Luo, Liang Chen, Zhiqin Chu et Kwai Hei Li. « An optical humidity sensor : a compact photonic chip integrated with artificial opal ». Sensors and Actuators B : Chemical, septembre 2021, 130763. http://dx.doi.org/10.1016/j.snb.2021.130763.

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Shaghaghi, Mehri, Aliakbar Yousefi et Maliheh Pishvaei. « Synthesis of artificial opals with core-shell morphology via emulsion polymerization technique ». e-Polymers 12, n^o 1 (1 décembre 2012). http://dx.doi.org/10.1515/epoly.2012.12.1.217.

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AbstractColloidal crystals with a refractive index varying periodically on the scale of the light wavelengths have been prepared by various methods. These photonic crystals reflect light and exhibit, at sufficiently strong contrast, even a complete band-gap in which light cannot propagate in any direction. In this study we first synthesize the latex spheres with a hard, crosslinked core and a grafted-on elastomeric shell that flows at elevated temperatures under uniaxial compression much like other polymer melts. However, the spheres start crystallizing at the plates of the press, whereupon the crystalline order grows, layer by layer, into the flowing melt. The process is fast and yields large area films, thin or thick, in which the latex spheres are crystallized. The refractive index contrast of these purely polymeric films is too small for a complete band-gap photonic crystal, but the films are attractive color materials showing wavelength and angle dependent reflection colors.

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Stevens, Leo R., David G. Harman, Kerry J. Gilmore, Marc in het Panhuis et Gordon G. Wallace. « A Comparison of Chemical and Electrochemical Synthesis of PEDOT:Dextran Sulphate for Bio-Application ». MRS Proceedings 1717 (2015). http://dx.doi.org/10.1557/opl.2015.19.

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ABSTRACTPoly(3,4-ethylenedioxythiophene) (PEDOT) is an organic conducting polymer that has been the focus of significant research over the last decade, in both energy and biological applications. Most commonly, PEDOT is doped by the artificial polymer polystyrene sulfonate due to the excellent electrical characteristics yielded by this pairing. The biopolymer dextran sulphate (DS) has been recently reported as a promising alternative to PEDOT:PSS for biological application, having electrical properties rivaling PEDOT:PSS, complimented by the potential bioactivity of the polysaccharide. In this work we compared chemical and electrochemical polymerisations of PEDOT:DS in terms of their impact on the electrical, morphological and biological properties of the resultant PEDOT:DS films. Post-growth cyclic voltammograms and UV-Vis analyses revealed comparable redox behaviour and absorbance profiles for the two synthesis approaches. Despite good intrinsic conductivity of particles, the addition of chemically produced PEDOT:DS did not markedly enhance the bulk conductivity of aqueous solutions due to the lack of interconnectivity between adjacent PEDOT:DS particles at achievable concentrations. Scanning electron microscopy revealed significantly greater roughness in films cast from chemically produced PEDOT:DS compared to electropolymerised samples, attributable to the formation of solution phase nanoparticles prior to casting. In cell studies with the L929 cell line, electrochemical polymerisation of PEDOT:DS afforded better integrity of resultant films for surface seeding, whilst chemically polymerised PEDOT:DS appeared to localised at the proliferating cells, suggesting possible applications in drug delivery.

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Qiu, Bo, et Xiulin Ruan. « Predicting Thermal Transport in Bi2Te3 : From Bulk to Nanostructures ». MRS Proceedings 1329 (2011). http://dx.doi.org/10.1557/opl.2011.1467.

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ABSTRACTTwo-body interatomic potentials in the Morse potential form have been developed for bismuth telluride, and the potentials are used in molecular dynamics (MD) simulations to predict the thermal conductivity of Bi2Te3 bulk, nanowires and few-quintuple thin films. The density functional theory with local density approximations is first used to calculate the total energies for many artificially distorted Bi2Te3 configurations to produce the energy surface. Then by fitting to this energy surface and other experimental data, the Morse potential form is parameterized. Molecular dynamics simulations are then performed to predict the thermal conductivity of bulk Bi2Te3 at different temperatures, and the results agree with experimental data well. We also predicted the thermal conductivity of Bi2Te3 nanowires with diameter ranging from 3 to 30 nm with both smooth (SMNW) and rough (STNW) surfaces. It is found that when the nanowire diameter decreases to the molecular scale (below 10 nm, or the so called "quantum wire"), the thermal conductivity shows significant reduction as compared to bulk value. We find the dimensional crossover behavior of thermal transport in few quintuple layer (QL) thin films at room temperature, and we attribute it to the interplay between phonon Umklapp scattering and boundary scattering. Also, nanoporous films show significantly reduced thermal conductivity compared to perfect thin films, indicating that they can be very promising thermoelectric materials.

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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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