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Littérature scientifique sur le sujet « Nano crystal »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Nano crystal"

Xiao, Quanlan, Wei Lin, Gengxu Chen, Chengjie Ding, Guoping Dong, Chensheng Lin, Botao Wu, E. Wu, Heping Zeng et Jianrong Qiu. « Morphology and polarization-dependent second harmonic generation in single hexagonal sodium niobate micro/nano-crystals ». Journal of Materials Chemistry C 3, n^o 16 (2015) : 4070–76. http://dx.doi.org/10.1039/c5tc00226e.

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The SHG responses from single hexagonal NaNbO₃ micro/nano-crystals with different morphologies and sizes were studied in detail. It was demonstrated that the same crystal structure displays a similar SHG response.

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Zhang, Haobin, Jinjiang Xu, Shichun Li, Jie Sun et Xiaolin Wang. « Characterization of Nano-Scale Parallel Lamellar Defects in RDX and HMX Single Crystals by Two-Dimension Small Angle X-ray Scattering ». Molecules 27, n^o 12 (16 juin 2022) : 3871. http://dx.doi.org/10.3390/molecules27123871.

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Nano-scale crystal defects extremely affect the security and reliability of explosive charges of weapons. In this work, the nano-scale crystal defects of 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) single crystals were characterized by two-dimension SAXS. Deducing from the changes of SAXS pattern with sample stage rotating, we firstly found the parallel lamellar nano-scale defects in both RDX and HMX single crystals. Further analysis shows that the average diameter and thickness of nano-scale lamellar defects for RDX single crystal are 66.4 nm and 19.3 nm, respectively. The results of X-ray diffraction (XRD) indicate that the lamellar nano-scale defects distribute along the (001) in RDX and the (011) in HMX, which are verified to be the crystal planes with the lowest binding energy by the theoretical calculation.

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Lee, Chang Kyu, Jong Sung Kwon, In Chul Na, Byung Il Han, Young Min Kim et Jea Gun Park. « Dependency of Electrical Characteristics on Au Nano-Crystal Size for Non-Volatile Memory Fabricated with Au Nano-Crystal Embedded in PVK(Poly(N-Vinylcarbazole)) Layer ». Solid State Phenomena 124-126 (juin 2007) : 33–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.33.

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We demonstrated a nonvolatile memory fabricated with the sandwich device structure of Al/Au nano-crystals embedded in the PVK/Al. The bi-stable conduction switching characteristic (Ion/Ioff ratio) was >1x102, depending on Au nano-crystal size. The size and distribution of Au nano-crystals were determined by the inserted Au-layer thickness between PVK layers. The size of Au nano-crystals increased with the inserted Au-layer thickness. The uniform distribution of isolated Au nano-crystals was obtained with 5 nm of the inserted Au-layer thickness.

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SUMMERS, CHRISTOPHER J., CURTIS W. NEFF et WOUNJHANG PARK. « ACTIVE PHOTONIC CRYSTAL NANO-ARCHITECTURES ». Journal of Nonlinear Optical Physics & ; Materials 12, n^o 04 (décembre 2003) : 587–97. http://dx.doi.org/10.1142/s0218863503001663.

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The development of nano-scaled photonic crystal structures has resulted in many new devices exhibiting non-classical optical behavior. Typically, in these structures a photonic band gap and associated defect mode are used to create waveguides, resonators, couplers and filters. In this paper we propose that the functionality of these structures can be significantly enhanced by the infiltration of the photonic crystal with other classes of materials, particularly highly nonlinear liquid crystals and electro-optical materials. The properties of conventional 2D PC slab waveguides were simulated by the finite difference time domain method and shown to exhibit very large refraction and dispersion, and significant tunable effects under bias when infiltrated with liquid crystal. In particular, a new superlattice photonic crystal concept is proposed and shown to exhibit up to ~50° tunability in the angle of refraction when alternate liquid crystal infiltrated pixel rows were modulated from their aligned to unaligned state. This modulation corresponds to index changes from 1.5 to 2.1; it is assumed that a refractive index change of up to approximately Δn=0.6 can be achieved. The superlattice effect was also demonstrated to induce new switching and out-coupling effects that were strongly dependent on the direction of propagation and index modulation. These simulations demonstrate the potential of a new class of optically-active photonic crystal architectures to tune giant refraction and dispersion characteristics and to enable new switching phenomena.

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Abdalameer, N. Kh, S. N. Mazhir, H. M. Salim, J. Kh Hammood et Z. H. Abdul Raheem. « Design of micro-jet plasma system : a novel nanoparticles manufacturing method in atmospheric pressure ». Journal of Optoelectronic and Biomedical Materials 14, n^o 4 (20 décembre 2022) : 203–10. http://dx.doi.org/10.15251/jobm.2022.144.203.

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Micro jet atmospheric (MPJ) plasma was first utilized to create nano-sized crystals. Nanosized particles may have advantageous characteristics such as better internal quality and dissolving rates of the product compared to traditional crystalline goods. A nebulizer system sprays an aerosol solution into plasma by use of a carrier gas in a cold plasma crystal (argon). The plasma warms and loads the droplets causing solvent and columbic fission evaporation, and then the nucleation and crystal formation start within the limited volume given by the tiny drops. This produces nano-sized crystals. MPJ was used to establish the operating parameters for producing nano-sized ZnSe material crystals using electron microscope transmitting and X-ray powder diffraction tests as well as sensitivity testing have been carried out. Sensitivity tests showed lower friction sensitivity for the nano-scale product, suggesting a better internal quality of the crystal product.

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Zhang, Yunjie, Xu Wang, Guodong Zhang, Razvan Stoian et Guanghua Cheng. « Nano-Crystal and Microstructure Formation in Fluoride Photo-Thermo-Refractive Glass Using Chirp-Controlled Ultrafast Laser Bessel Beams ». Nanomaterials 11, n^o 6 (28 mai 2021) : 1432. http://dx.doi.org/10.3390/nano11061432.

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Nano-crystals were formed in the exposed regions of photo-thermo-refractive glass undergoing irradiation with zeroth order chirp-controlled ultrafast laser Bessel beams and subsequent heat treatment. Effects of various writing powers, pulse durations and heat treatment time on the distribution and the size of the nano-crystals were investigated. The results show that nano-crystals’ distribution depended on the laser power density spatial shape, while the size of the nano-crystals is quasi-independent. However, the average diameter of the nano-crystals was affected by the heat treatment time, decreasing from 175 to 105 nm with the time halved. In addition, using crystallographic characterization by X-ray diffraction, the nano-crystal composition in the laser-exposed regions was detected to be sodium fluoride.

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Dufresne, Alain. « Polysaccharide nano crystal reinforced nanocomposites ». Canadian Journal of Chemistry 86, n^o 6 (1 juin 2008) : 484–94. http://dx.doi.org/10.1139/v07-152.

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There are numerous examples of animals or plants that synthesize extracellular high-performance skeletal biocomposites consisting of a matrix reinforced by nano sized crystalline domains. Cellulose and chitin are classical examples of these reinforcing elements, which occur as whisker-like microfibrils that are biosynthesized and deposited in a continuous fashion. In many cases, this mode of biogenesis leads to crystalline microfibrils that are almost defect-free, and whose axial physical properties therefore approach those of perfect crystals. During the last decade we have attempted to mimic biocomposites by blending cellulose or chitin whiskers from different sources with polymer matrices. Aqueous suspensions of such nano crystals can be prepared by acid hydrolysis of the substrate. The object of this treatment is to dissolve away regions of low lateral order so that the water-insoluble, highly crystalline residue may be converted into a stable suspensoid by subsequent vigorous mechanical shearing action. The resulting nano crystals occur as rod-like particles or whiskers, whose dimensions depend on the nature of the substrate. They are typically a few hundred nm long and between 5 and 20 nm in diameter. Starch can also be used as a source for the production of nano crystals. The constitutive nano crystals appear as platelet-like nano particles with a length ranging between 20 and 40 nm, a width ranging between 15 and 30 nm, and a thickness ranging between 5 and 7 nm. Since the first announcement of using cellulose whiskers as a reinforcing phase, they have been used extensively as model fillers in several kinds of polymeric matrices, including synthetic and natural ones. Casting mixtures of polysaccharide nano crystals and lattices led to the production of nano composite materials with drastically enhanced mechanical properties, especially at T > Tg of the matrix, by virtue of the formation of a whiskers network, even when the whisker volume fraction was only a few percent. The formation of this rigid network, resulting from strong interactions between whiskers, was assumed to be governed by a percolation mechanism. This hydrogen-bonded network induced a thermal stabilization of the composite up to 500 K, the temperature at which polysaccharides start to decompose. Any factors that perturb the formation of this percolating network directly affect the reinforcing effect of polysaccharide nano crystals. In addition to some practical applications, the study of these nano composite materials can help researchers understand such physical properties as the geometric and mechanical percolation effect.Key words: nano composites, polysaccharide, polymer, cellulose, nano crystal.

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Witika, Bwalya A., Vincent J. Smith et Roderick B. Walker. « Top-Down Synthesis of a Lamivudine-Zidovudine Nano Co-Crystal ». Crystals 11, n^o 1 (30 décembre 2020) : 33. http://dx.doi.org/10.3390/cryst11010033.

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Lamivudine (3TC) and zidovudine (AZT) are antiretroviral agents used to manage HIV/AIDS infection. A wet media milling top-down approach was used to develop and produce nano co-crystals of 3TC and AZT. Micro co-crystals were prepared by solvent evaporation and subsequently milled in the presence of two surfactants, viz., sodium lauryl sulfate (SLS) and α-tocopheryl polyethylene glycol succinate 1000 (TPGS 1000). Optimisation was undertaken using design of experiments (DoE) and response surface methodology (RSM) to establish and identify parameters that may affect the manufacturing of nano co-crystals. The impact of SLS and TPGS 1000 concentration, milling time, and number of units of milling medium on the manufacturing of nano co-crystals, was investigated. The critical quality attributes (CQA) monitored were particle size (PS), Zeta potential (ZP), and polydispersity index (PDI). Powder X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry, transmission electron microscopy, energy dispersive X-ray spectroscopy scanning electron microscopy, and cytotoxicity assays were used for additional characterization of the optimised nano co-crystal. The mean PS, PDI, and ZP of the optimised top-down nanocrystal were 271.0 ± 92.0 nm, 0.467 ± 0.073, and −41.9 ± 3.94 mV, respectively. In conclusion, a simple, inexpensive, rapid, and precise method of nano co-crystal manufacturing was developed, validated, and optimised using DoE and RSM, and the final product exhibited the target CQA.

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Liu, Hailu, Dong Xie, Huayan Shen, Fayong Li et Junjia Chen. « Functional Micro–Nano Structure with Variable Colour : Applications for Anti-Counterfeiting ». Advances in Polymer Technology 2019 (8 décembre 2019) : 1–26. http://dx.doi.org/10.1155/2019/6519018.

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Colour patterns based on micro-nano structure have attracted enormous research interests due to unique optical switches and smart surface applications in photonic crystal, superhydrophobic surface modification, controlled adhesion, inkjet printing, biological detection, supramolecular self-assembly, anti-counterfeiting, optical device and other fields. In traditional methods, many patterns of micro-nano structure are derived from changes of refractive index or lattice parameters. Generally, the refractive index and lattice parameters of photonic crystals are processed by common solvents, salts or reactive monomers under specific electric, magnetic and stress conditions. This review focuses on the recent developments in the fabrication of micro-nano structures for patterns including styles, materials, methods and characteristics. It summarized the advantages and disadvantages of inkjet printing, angle-independent photonic crystal, self-assembled photonic crystals by magnetic field force, gravity, electric field, inverse opal photonic crystal, electron beam etching, ion beam etching, laser holographic lithography, imprinting technology and surface wrinkle technology, etc. This review will provide a summary on designing micro-nano patterns and details on patterns composed of photonic crystals by surface wrinkles technology and plasmonic micro-nano technology. In addition, colour patterns as switches are fabricated with good stability and reproducibility in anti-counterfeiting application. Finally, there will be a conclusion and an outlook on future perspectives.

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Lie, Guang Hua, Zhi Lie Tang, Gan Wen Lie, Ting Yang et Xiu Wen Tang. « Measure of the Optical and Electrical Properties of Semiconductor SiO₂ Nano-Crystalline by Using Photo-Acoustic Technology ». Advanced Materials Research 415-417 (décembre 2011) : 2156–59. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.2156.

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By using a new type of single-beam normalized photo-acoustic spectroscopy that with weak signal detection and non-invasive testing, the photo-acoustic spectroscopy of semiconductor SiO2 nano-crystals was measured，the measured spectra of semiconductor SiO2 nano-crystals absorption coefficient was 0.20, and powders band gap is 3.4eV. The TEM image shows that the semiconductor SiO2 nano-crystals are round lump structure, while the grain size of the semiconductor SiO2 nano-crystals is about 70x200 nm, and the average particle size after the reunion is 100x300 nm. Compared with their micron crystal, the optical and electrical properties of semiconductor nano-crystals and nano-particle size are closely related. By changing the size of semiconductor nano-crystals, the mix could achieve the goal of changing the optical and electrical properties. Because of the semiconductor SiO2 nano-crystals‘ special properties of optics and electronics and photo-semiconductor nano-materials, they are widely used in many areas of modern science and technology.

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Thèses sur le sujet "Nano crystal"

Zhu, Rui. « Integrated nano-optomechanics in photonic crystal ». Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS258/document.

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Les oscillateurs de référence de haute pureté sont actuellement utilisés dans un grand nombre d’applications allant du contrôle de fréquence aux horloges pour les radars, les GPS et l’espace... Les tendances actuelles dans ce domaine requièrent des architectures miniaturisées avec la génération de signaux directement dans la gamme de fréquences d’intérêt, autour de quelques GHz. Récemment, de nouvelles architectures basées sur les principes de l’optomécanique ont vu le jour dans ce but. De tels oscillateurs optomécanique génèrent non seulement des signaux hyperfréquences directement dans la gamme de fréquences GHz avec éventuellement un faible bruit de phase, mais permettent également un degré élevé d'intégration sur puce. Ce travail de thèse s'inscrit dans cette démarche. L’oscillateur optomécanique étudié se compose de cavités à cristaux photoniques suspendues couplées à des guides d’ondes silicium sur isolant intégrés dans une architecture tridimensionnelle. Ces cavités abritent des modes optiques fortement confinés autour de 1550nm et des modes mécaniques dans le GHz. De plus, ces structures présentent un recouvrement spatial entre phonon et photon élevé. Il en résulte un couplage optomécanique amélioré. Cette force de couplage optomécanique améliorée est ici sondée optiquement sur des structures à cristaux photoniques de conception optimisée. Ces cavités sont réalisées dans des matériaux semi-conducteurs III-V dont la piézoélectricité nous permet d'intégrer des outils supplémentaires pour sonder et contrôler les vibrations mécaniques via un pilotage capacitif, piézoélectrique ou acoustique. Ce contrôle total des modes mécaniques et de l’interaction optomécanique ouvre la voie à la mise en œuvre de circuits intégrés pour le verrouillage par injection et des boucles de rétroaction permettant de réduire le bruit de phase de l’oscillateur
High purity reference oscillators are currently used in a wide variety of frequency control and timing applications including radar, GPS, space... Current trends in such fields call for miniaturized architectures with direct signal generation in the frequency range of interest, around few GHz. Recently, novel optomechanically-enhanced architectures have emerged with this purpose. Such optomechanically-driven oscillators not only generate microwave signals directly in the GHz frequency range with possibly low phase noise but also are amenable to a high degree of integration on single chip settings. This PhD work falls within this scope. The optomechanically-driven oscillator under study consists of suspended photonic crystal cavities coupled to integrated silicon-on-insulator waveguides in a three-dimensional architecture. These cavities harbor highly-confined optical modes around 1,55 µm and mechanical modes in the GHz and most importantly, feature a high phonon-photon spatial overlap, all resulting in an enhanced optomechanical coupling. This enhanced optomechanical coupling strength is here probed optically on photonic crystal structures with optimized design. These cavities are hosted in III-V semiconductor materials whose piezoelectricity enable us to integrate additional tools for probing and controlling mechanical vibrations via capacitive, piezoelectric or acoustic driving. This full control over the mechanical modes and optomechanical interaction, paves the way towards the implementation of integrated injection locking circuits of feedback loops for reducing the phase noise of the oscillator

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Vizuete, Olivier. « Simulation study of phononic crystal structures ». Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326118.

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Thermoelectric materials are important in today’s society with a variety of applications. The material properties that determinate the efficiency of a thermoelectric device are mostly constants. In order to develop more efficient thermoelectric devices new materials and solutions need to be made. Minimizing the thermal conductivity in thermoelectric materials is of great interest to make them more effective. One effective way of lowering the thermal conductivity is to introduce holes in the lattice and create a phononic crystal. The main focus of this master thesis has been on how to place these holes and to optimize the geometry to minimize thermal conductivity. The method used in this report is based solely on simulations, which were done using Comsol Multiphysics 5.2a. The results are compared to already published results. Different geometries are tested to see how it affects the thermal conductivity and to optimize the phononic crystal. The Maxwell-Eucken model is also used to see how porosity affects the thermal conductivity and to analyze what the lowering in thermal conductivity depends on. The result showed a substantial reduction in thermal conductivity when creating a phononic crystal compared to bulk silicon. The simulated reduction compared to bulk silicon is up to 98.5% when introducing holes in the lattice, while Maxwell-Eucken only predicted a 74% reduction due to porosity. The conclusion is that by creating holes in a periodical pattern, phonon dispersion will occur, which lower the thermal conduction significantly.

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Al-Zangana, Shakhawan. « Nano- and micro-particle doped liquid crystal phases ». Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/nano-and-microparticle-doped-liquid-crystal-phases(31dbb051-7d9c-4780-bda0-d58773846de0).html.

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This thesis presents the investigation of the liquid crystal (LC) - particle suspensions. Particles from nano- to micro-size, spherical to two-dimensional shapes, with different functionality are dispersed into nematic and smectic phases. The aim is to create ordered nanoparticle (NP) assemblies and thereby modify the common properties of the liquid crystal, such as dielectric anisotropy and electro-optical, revealing any interaction between particles and LC properties. It is found that for concentrations (>0.5vol%), the ferroelectric NPs have increased the sensitivity of the nematic liquid crystal to the electric field through electro-optical responses, which is seen by an enhancement in the dielectric anisotropy. This could be induced by the coupling of the electrical dipole moments in the spherical NPs with the LC director field. The electro-optical properties of the chiral smectic (SmC*) phase (tilt angle Θ, switching time τ_s and spontaneous polarisation P_s) are found to be independent of the concentration and sizes of the doped NPs. The relaxation frequency f_R of the Goldstone mode is faster in the ferroelectric NPs suspensions of 2.0vol% compared to the paraelectric NPs. In the graphene oxide (GO) - nematic LC (5CB) suspensions, the small GO sizes of mean size 560 nm are more easily dispersible than larger flakes of 2.8 micro metre mean size. As the GO concentration is increased, each of the threshold voltage and splay elastic constant dramatically increases, reaching saturation at ≈1.0wt%. The field driven switching-on time is practically not affected, while the purely elastically driven switching-off time is strongly sped-up. Interestingly, thermotropic and lyotropic LC phases are exhibited in the GO-5CB suspensions when heating the thermotropic liquid crystal into its isotropic phase. The isotropic phase of 5CB acts as a solvent for the GO particles, forming a lyotropic nematic phase with largely reduced birefringence. It is found that the nematic to isotropic phase transition is shifted toward higher temperature for the GO-5CB system compared to the BaTiO3-5CB system. Dispersions of different sizes of GO flakes are prepared in isotropic and nematic fluid media. The dielectric relaxation behaviour of GO-dispersions was examined for a wide temperature range (25-60 ℃) and frequency range (100 Hz-2 MHz). The mixtures containing GO flakes were found to exhibit varying dielectric relaxation processes, depending on the size of the flakes and the elastic properties of the dispersant fluid. The relaxation frequencies in the isotropic media were lower compared to the nematic medium. Relaxation frequencies (~10 kHz) are observed in the GO-isotropic media, which are reduced as the size of the GO flakes are decreased, are anticipated to be inherited from GO flakes. However, the fast relaxations (~100 kHz) that are observed in the nematic suspensions could imply strongly slowed down molecular relaxation modes of the nematogenic molecules. Finally, the phase diagram of lyotropic LC as a function of the lateral dimensions of the GO flakes, their concentration, geometrical confinement configuration and solvent polarity was investigated. Polarising optical microscopy was used to determine isotropic-biphasic-nematic phase evolution. The confinement volume and geometry of the sample relative to the GO size are shown to be vital to the observation of the lyotropic phase. GO LCs have the potential for a range of applications from display technologies to conductive fibres. The confinement related LC phase transition is critical toward their applications. It is also found that the stability of the LC phase is higher for the solvent of higher dielectric constant.

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Hurley, Evan Patrick. « A crystal engineering approach for the design of multicomponent crystals and assembly of nano-scale architectures ». Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16004.

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Doctor of Philosophy
Department of Chemistry
Christer B. Aakeroy
The work presented in this thesis has demonstrated that supramolecular synthons can be used to make multicomponent crystals, and various synthons can be combined to make supermolecules. The synthons can also be used to construct nanoscale assemblies. Molecules containing single and multiple hydrogen-bond (HB) and halogen-bond (XB) acceptor sites have been synthesized in an effort to carry out supramolecular synthesis in order to establish a reliable hierarchy for intermolecular interactions. Pyrazole-based molecules have been made, combined with various carboxylic acids, and characterized using infrared (IR) spectroscopy to give a success rate of 55-70%. Reactions that gave a positive result were converted to solution experiments, and crystals were grown and characterized using single-crystal X-ray diffraction (XRD). The co-crystals display infinite 1-D chains with the intended stoichiometry and structural landscape on 6/6 occasions. The salts, on the other hand, display unpredictable stoichiometry and structural landscape on 5/5 occasions. Furthermore, the electrostatic charge on the primary hydrogen-bond acceptor, N(pyz), can be altered by adding a nitro, R-NO2, covalent handle to the backbone of the pyrazole molecule. Addition of a strongly electron withdrawing group significantly lowered the charge on the pyrazole nitrogen atom and, in turn, lowered the supramolecular yield to 10%. Ditopic molecules containing pyrazole and pyridine on the same molecular backbone were synthesized and characterized using 1H NMR. The molecules were co-crystallized with carboxylic acids, and the resulting solids were characterized using IR spectroscopy. The solids could then be classified as co-crystal or salt using specific markers in the IR spectrum. Single-crystal XRD was used to observe the intermolecular interactions in the co-crystals and salts, and the co-crystals were assigned to two groups: Group 1 (2) and Group 2 (2). The salts (4) show more unpredictability with stoichiometry and structural landscape. A library of ditopic molecules containing triazole and pyridine acceptor sites were synthesized and characterized using 1H and 13C NMR. The molecules were co-crystallized with carboxylic acids and the resulting solids were characterized using IR spectroscopy which demonstrated a 100% supramolecular yield whenever a pyridine moiety was present, consistent with results from Chapter 3. Single-crystal XRD was used to identify the intermolecular interactions in the co-crystals (2) and salt (1), and the results show that triazole can compete with pyridine for hydrogen bond donors. A library of ditopic molecules was also used for halogen-bonding (XB) studies with a series of activated iodine and bromine-based donors. The results show that iodine donors have a higher success rate range (12.5-75%) compared to bromine donors (16.7-50%) based on results obtained from IR spectra. Furthermore, the results from the XRD show that pyrazole nitrogen atoms can compete with pyridine for forming XB, and two groups of supramolecular synthons were observed. Finally, relatively weak non-covalent interactions, HB and XB, can influence the assembly of nanoparticles based on IR spectroscopy and TEM images. The assembly of the particles is influenced by specific capping ligands, which were synthesized and characterized using 1H, 13C and 19F NMR. The results demonstrate that relatively weak non-covalent interactions based on HB and XB interactions can influence nanoparticle assembly.

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Mei, Shan. « Novel Three Dimensional C_3v Symmetric Nano-molecules Based on Polyhedral Oligomeric Silsesquioxanes (POSS) Nano-atoms ». University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1367361671.

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Brunstein, Maia. « Nonlinear Dynamics in III-V Semiconductor Photonic Crystal Nano-cavities ». Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00606315.

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L'optique non linéaire traite les modifications des propriétés optiques d'un matériau induites par la propagation de la lumière. Depuis ses débuts, il y a cinquante ans, des nombreuses applications ont été démontrées dans presque tous les domaines de la science. Dans le domaine de la micro et nano-photonique, les phénomènes non linéaires sont à la fois au cœur d'une physique fondamentale fascinante et des applications intéressantes: ils permettent d'adapter et de contrôler le flux de lumière à une échelle spatiale inferieure à la longueur d'onde. En effet, les effets non linéaires peuvent être amplifiés dans des systèmes qui confinent la lumière dans des espaces restreints et avec de faibles pertes optiques. Des bons candidats pour ce confinement sont les nanocavités à cristaux photoniques (CPs), qui ont été largement étudiées ces dernières années. Parmi la grande diversité des processus non linéaires en optique, les phénomènes dynamiques tels que la bistabilité et l'excitabilité font l'objet de nombreuses études. La bistabilité est bien connue pour ces applications potentielles pour les mémoires et les commutateurs optiques et pour les portes logiques. Une réponse excitable typique est celle subjacente dans le déclanchement du potentiel d'action dans les neurones. En optique, l'excitabilité a été observée il y a une quinzaine d'années. Dans ce travail, nous avons étudié les régimes bistables, auto-oscillants et excitables dans des nanocavités semiconductrices III-V à CP. Afin de coupler efficacement la lumière dans les nanocavités, nous avons développé une technique de couplage par onde évanescente en utilisant une microfibre optique étirée. Grâce à cette technique, nous avons démontré pour la première fois l'excitabilité dans une nanocavité à CP. En parallèle, nous avons accompli la première étape vers la dynamique non linéaire dans un réseau de cavités couplées en démontrant le couplage optique linéaire entre nanocavitités adjacentes. Ceci a été réalisé en utilisant de mesures de photoluminescence en champ lointain. Un ensemble de résonateurs non linéaires couplés ouvre la voie à une famille de phénomènes dynamiques non linéaires très riches, basés sur la rupture spontanée de symétrie. Nous avons démontré théoriquement ce phénomène dans deux cavités couplées par onde évanescente. Les premières études expérimentales de ce régime ont été menées, établissant ainsi les bases pour une future démonstration de la rupture spontanée de symétrie dans un réseau de nanocavités non linéaires couplées.

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Marseglia, Luca. « Nano-structures coupled to optically active defects in diamond ». Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573911.

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Reinke, Charles M. « Design, simulation, and characterization toolset for nano-scale photonic crystal devices ». Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33932.

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The objective of this research is to present a set of powerful simulation, design, and characterization tools suitable for studying novel nanophotonic devices. The simulation tools include a three-dimensional finite-difference time-domain code adapted for parallel computing that allows for a wide range of simulation conditions and material properties to be studied, as well as a semi-analytical Green's function-based complex mode technique for studying loss in photonic crystal waveguides. The design tools consist of multifunctional photonic crystal-based template that has been simulated with nonlinear effects and measured experimentally, and planar slab waveguide structure that provides highly efficient second harmonic generation is a chip-scale device suitable for photonic integrated circuit applications. The characterization tool is composed of a phase-sensitive measurement system using a lock-in amplifier and high-precision optical stages, suitable for probing the optical characteristics of nanoscale devices. The high signal-to-noise ratio and phase shift data provided by the lock-in amplifier allow for accurate transmission measurements as well as a phase spectrum that contains information about the propagation behavior of the device beyond what is provided by the amplitude spectrum alone.

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Liang, Hong. « Crystal plasticity modelling of lengthscale effects in deformation and nano-indentation ». Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496995.

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Pendergast, Megan. « Environmental effects on nano-wear of gold and KBr single crystal ». [Tampa, Fla.] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002306.

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Livres sur le sujet "Nano crystal"

Liquid crystals with nano and microparticles. [Hackensack] New Jersey : World Scientific, 2015.

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Meeting, on Mesoporous Crystals and Related Nano-Structured Materials (2004 Stockholm Sweden). Mesoporous crystals and related nano-structured materials : Proceedings of the Meeting on Mesoporous Crystals and Related Nano-Structured Materials, Stockholm, Sweden, 1-5 June 2004. Amsterdam, The Netherlands : Elsevier, 2004.

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Crystal Plasticity at Micro- and Nano-scale Dimensions. MDPI, 2021. http://dx.doi.org/10.3390/books978-3-0365-0875-7.

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Siffert, Paul, et Robert Triboulet. CdTe and Related Compounds ; Physics, Defects, Hetero- and Nano-Structures, Crystal Growth, Surfaces and Applications : Crystal Growth, Surfaces and Applications. Elsevier, 2009.

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CdTe and Related Compounds ; Physics, Defects, Hetero- and Nano-structures, Crystal Growth, Surfaces and Applications. Elsevier, 2010. http://dx.doi.org/10.1016/c2009-0-17817-0.

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CdTe and Related Compounds ; Physics, Defects, Hetero- and Nano-structures, Crystal Growth, Surfaces and Applications. Elsevier, 2010. http://dx.doi.org/10.1016/c2009-0-61369-6.

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Lagerwall, Jan P. F., et Giusy Scalia. Liquid Crystals with Nano and Microparticles. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9280.

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Šesták, Jaroslav, Pavel Hubík et Jiří J. Mareš. Glassy, Amorphous and Nano-Crystalline Materials. Springer, 2010.

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Mesoporous Crystals and Related Nano-Structured Materials, Proceedings of the Meeting on Mesoporous Crystals and Related Nano-Structured Materials. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)x8161-1.

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Nano-Science : Colloidal Background. CRC, 2008.

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Chapitres de livres sur le sujet "Nano crystal"

Zhan, Zhao Lin, Ye Dong He, Deren Wang et Wei Gao. « Micro- /Nano-Crystal Aluminized ODS Coatings ». Dans High-Temperature Oxidation and Corrosion 2005, 323–30. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-409-x.323.

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Kulkarni, Samir A., et Allan S. Myerson. « Methods for Nano-Crystals Preparation ». Dans Engineering Crystallography : From Molecule to Crystal to Functional Form, 275–87. Dordrecht : Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1117-1_16.

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Guo, Zhi Qiang, Hui Min Xie, Bao Chen Liu, Bing Pan, Peng Wan Chen, Qing Ming Zhang et Feng Lei Huang. « Digital Image Correlation Study on Micro-Crystal of Poly-Crystal Aluminum Specimen under Tensile Load through SEM ». Dans Experimental Mechanics in Nano and Biotechnology, 155–58. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.155.

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Yoshioka, Tomohiko, Toshiyuki Ikoma, Akira Monkawa, Toru Tonegawa, Dinko Chakarov, B. Kasemo, Nobutaka Hanagata et Junzo Tanaka. « Protein Adsorption on Hydroxyapatite Nano-Crystals with Quartz Crystal Microbalance Technique ». Dans Bioceramics 20, 1119–22. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-457-x.1119.

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Lagerwall, Jan P. F. « Liquid Crystal-Functionalized Nano- and Microfibers Produced by Electrospinning ». Dans Liquid Crystals Beyond Displays, 251–84. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118259993.ch7.

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Lee, Dae Hee, Chang Yul Lim, Min Hyon Jeon, Moon Kyoung Kim, Sung Bong Park et Kwan Soo Lee. « Local Heat Transfer Measurements Using Liquid Crystal Thermography Technique ». Dans Experimental Mechanics in Nano and Biotechnology, 1295–300. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1295.

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Vilar, R. « Microstructure Modification : Generation of Crystal Defects and Phase Transformations ». Dans Handbook of Laser Micro- and Nano-Engineering, 1–60. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-69537-2_14-1.

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Vilar, R. « Microstructure Modification : Generation of Crystal Defects and Phase Transformations ». Dans Handbook of Laser Micro- and Nano-Engineering, 213–72. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63647-0_14.

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Pyshkin, Sergei L., et John M. Ballato. « Long-Term Convergence of Bulk- and Nano-Crystal Properties ». Dans Ceramic Transactions Series, 77–90. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144480.ch9.

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Chattopadhyay, Jayeeta, et Rohit Srivastava. « Liquid Crystal Nanoparticles in Commercial Drug Delivery System ». Dans Liquid Crystals with Nano/Micro Particles and Their Applications, 116–30. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003093527_4.

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Actes de conférences sur le sujet "Nano crystal"

Diaz, A., S. Kubo, D. H. Kwon, J. Park, D. Werner, T. Mallouk et I. C. Khoo. « Nonlinear liquid crystal Nano-metamaterials ». Dans 2008 IEEE/LEOS Winter Topical Meeting Series. IEEE, 2008. http://dx.doi.org/10.1109/leoswt.2008.4444416.

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Myung-Ki Kim, Min-Kyo Seo, Seo-Heon Kim et Yong-Hee Lee. « Reconfigurable photonic crystal resonators ». Dans 2008 International Nano-Optoelectronics Workshop. IEEE, 2008. http://dx.doi.org/10.1109/inow.2008.4634418.

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O'Brien, J., Min-Hsiung Shih, Tian Yang, M. Bagheri, W. K. Marshall, P. D. Dapkus et D. G. Deppe. « Photonic Crystal Devices ». Dans 2006 Sixth IEEE Conference on Nanotechnology. IEEE, 2006. http://dx.doi.org/10.1109/nano.2006.247758.

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Rani, Preeti, Yogita Kalra, Venus Dillu et R. K. Sinha. « Photonic crystal based nano-displacement sensor ». Dans SPIE Optical Engineering + Applications, sous la direction de Shizhuo Yin et Ruyan Guo. SPIE, 2014. http://dx.doi.org/10.1117/12.2061627.

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Huang, Yidong, Xiaoyu Mao, Kaiyu Cui et Lei Cao. « Research on Slab Photonic Crystal Waveguides ». Dans 2007 International Nano-Optoelectronics Workshop. IEEE, 2007. http://dx.doi.org/10.1109/inow.2007.4302876.

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Ando, Shinji, Leping Bu, Masayuki Tsushida et Hideki Tonda. « Molecular Dynamic Simulation of Crack Propagation Behavior in Nano Size HCP Crystals ». Dans ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ipack2005-73042.

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A crack propagation behavior of nano size hcp crystal (13nm × 24nm × 4.6nm) has been simulated by molecular dynamics method using Lennard-Jones type potential. In a case of model crystal with initial notch plane and direction were (1010), [1210], the crack propagated parallel to notch plane and two sets of prismatic slips were occurred at the crack. Therefore, the crack in this crystal is deduced to extend by alternating shear on two intersecting {1010}<1210> prismatic slip systems. In a model crystal with (0001), [1010] initial crack, {1011} first order pyramidal slip occurred at crack tip and following {1012} twin was also observed. In the model crystal with (1010)[0001] initial crack, the crack propagated parallel to initial crack plane with two prismatic slips in front of the crack. To understand strength of nano size titanium crystals as MEMS materials, stress intensity factor, K of each model crystals were also estimated from stress-strain curves obtained from these simulations.

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Zhao, Yuncheng, HongJun Liu, Zhaolu Wang, Nan Huang et Jing Han. « Terahertz filter and demultiplexer with photonic crystal waveguide ». Dans Nano-Micro Conference 2017. London : Nature Research Society, 2017. http://dx.doi.org/10.11605/cp.nmc2017.01008.

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Park, Hong-Kyu, Min-Kyo Seo, Sun-Kyung Kim, Seo-Heon Kim et Yong-Hee Lee. « Electrical 2-D Slab Photonic Crystal Lasers ». Dans 2007 International Nano-Optoelectronics Workshop. IEEE, 2007. http://dx.doi.org/10.1109/inow.2007.4302889.

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Qin, Tim, Ming Zhang, Excimer Gong, Annie Guo, Qiang Guo et Wei-Ting Kary Chien. « Crystal defects analysis using nano-probe technologies ». Dans 2009 16th IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA). IEEE, 2009. http://dx.doi.org/10.1109/ipfa.2009.5232649.

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Dhakal, Tara P., Lakshmi K. Ganta, Daniel Vanhart et Charles R. Westgate. « Annealing of FeS2 nano-crystal thin film ». Dans 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC). IEEE, 2012. http://dx.doi.org/10.1109/pvsc.2012.6317593.

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Rapports d'organisations sur le sujet "Nano crystal"

Strouse, Geoffrey F. Assembling Nano-Materials by Bio-Scaffolding : Crystal Engineering in Nano-Electronics. Fort Belvoir, VA : Defense Technical Information Center, mars 2000. http://dx.doi.org/10.21236/ada393942.

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Tsui, Daniel C. Photonic Crystal/Nano-Electronic Device Structures for Large Array Thermal Imaging. Fort Belvoir, VA : Defense Technical Information Center, novembre 2007. http://dx.doi.org/10.21236/ada490932.

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Semendy, Fred, Gomatam Jaganathan, Nibir Dhar, Sudhir Trivedi, Ishwara Bhat et Yuanping Chen. Colloidal CdTe Nano Crystals Synthesis and Characterization. Fort Belvoir, VA : Defense Technical Information Center, septembre 2008. http://dx.doi.org/10.21236/ada486559.

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Kastner, Marc A. Measurement of Single Electronic Charging of Semiconductor Nano-Crystals. Office of Scientific and Technical Information (OSTI), octobre 2014. http://dx.doi.org/10.2172/1229880.

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