Bibliographies thématiques / Nanoscale Dimensions

Littérature scientifique sur le sujet « Nanoscale Dimensions »

Auteur : Grafiati
Publié le 7 septembre 2023

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Articles de revues sur le sujet "Nanoscale Dimensions"

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Menozzi, Edoardo, Hideki Onagi, Arnold L. Rheingold et Julius Rebek. « Extended Cavitands of Nanoscale Dimensions ». European Journal of Organic Chemistry 2005, no 17 (septembre 2005) : 3633–36. http://dx.doi.org/10.1002/ejoc.200500342.

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XU, JINZE, KELIU WU, RAN LI, ZANDONG LI, JING LI, QILU XU, LINKAI LI et ZHANGXIN CHEN. « NANOSCALE PORE SIZE DISTRIBUTION EFFECTS ON GAS PRODUCTION FROM FRACTAL SHALE ROCKS ». Fractals 27, no 08 (1 novembre 2019) : 1950142. http://dx.doi.org/10.1142/s0218348x19501421.

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Effect of nanoscale pore size distribution (PSD) on shale gas production is one of the challenges to be addressed by the industry. An improved approach to study multi-scale real gas transport in fractal shale rocks is proposed to bridge nanoscale PSD and gas filed production. This approach is well validated with field tests. Results indicate the gas production is underestimated without considering a nanoscale PSD. A PSD with a larger fractal dimension in pore size and variance yields a higher fraction of large pores; this leads to a better gas transport capacity; this is owing to a higher free gas transport ratio. A PSD with a smaller fractal dimension yields a lower cumulative gas production; this is because a smaller fractal dimension results in the reduction of gas transport efficiency. With an increase in the fractal dimension in pore size and variance, an apparent permeability-shifting effect is less obvious, and the sensitivity of this effect to a nanoscale PSD is also impaired. Higher fractal dimensions and variances result in higher cumulative gas production and a lower sensitivity of gas production to a nanoscale PSD, which is due to a better gas transport efficiency. The shale apparent permeability-shifting effect to nanoscale is more sensitive to a nanoscale PSD under a higher initial reservoir pressure, which makes gas production more sensitive to a nanoscale PSD. The findings of this study can help to better understand the influence of a nanoscale PSD on gas flow capacity and gas production.
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Wang, Fuyong, Peiqing Lian, Liang Jiao, Zhichao Liu, Jiuyu Zhao et Jian Gao. « Fractal Analysis of Microscale and Nanoscale Pore Structures in Carbonates Using High-Pressure Mercury Intrusion ». Geofluids 2018 (7 juin 2018) : 1–15. http://dx.doi.org/10.1155/2018/4023150.

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This paper investigated fractal characteristics of microscale and nanoscale pore structures in carbonates using High-Pressure Mercury Intrusion (HPMI). Firstly, four different fractal models, i.e., 2D capillary tube model, 3D capillary tube model, geometry model, and thermodynamic model, were used to calculate fractal dimensions of carbonate core samples from HPMI curves. Afterwards, the relationships between the calculated fractal dimensions and carbonate petrophysical properties were analysed. Finally, fractal permeability model was used to predict carbonate permeability and then compared with Winland permeability model. The research results demonstrate that the calculated fractal dimensions strongly depend on the fractal models used. Compared with the other three fractal models, 3D capillary tube model can effectively reflect the fractal characteristics of carbonate microscale and nanoscale pores. Fractal dimensions of microscale pores positively correlate with fractal dimensions of the entire carbonate pores, yet negatively correlate with fractal dimensions of nanoscale pores. Although nanoscale pores widely develop in carbonates, microscale pores have greater impact on the fractal characteristics of the entire pores. Fractal permeability model is applicable in predicting carbonate permeability, and compared with the Winland permeability model, its calculation errors are acceptable.
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Lücking, Ulrich, Fabio C. Tucci, Dmitry M. Rudkevich et Julius Rebek. « Self-Folding Cavitands of Nanoscale Dimensions ». Journal of the American Chemical Society 122, no 37 (septembre 2000) : 8880–89. http://dx.doi.org/10.1021/ja001562l.

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Kroto, Harold. « Mechanisms of Self Assembly at Nanoscale Dimensions ». Journal of Nanoscience and Nanotechnology 10, no 9 (1 septembre 2010) : 5911. http://dx.doi.org/10.1166/jnn.2010.2557.

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Singh, Bharti, B. R. Mehta, Deepak Varandani, Andreea Veronica Savu et Juergen Brugger. « Exploring Nanoscale Electrical Properties of CuO-Graphene Based Hybrid Interfaced Memory Device by Conductive Atomic Force Microscopy ». Journal of Nanoscience and Nanotechnology 16, no 4 (1 avril 2016) : 4044–51. http://dx.doi.org/10.1166/jnn.2016.10713.

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The phenomenon of resistive switching is based on nanoscale changes in the electrical properties of the interface. In the present study, conductive atomic force microscope based nanoscale measurements of copper oxide (CuO)-multilayer graphene (MLG) hybrid interface based devices have been carried out to understand changes in the electrical properties during resistive switching of the Ti–CuO/MLG-Cu memory cells having different dimensions fabricated on the same substrate using stencil lithography technique. The dependence of resistive switching characteristics in LRS and HRS and current level of the conductive filaments (CF) on the electrode area have been studied. As the device dimension is reduced, the filamentary contribution is enhanced in comparison to the background contribution, resulting in an increase in the current density ratio between LRS and HRS. It is also observed that as the device dimension is decreased from 150 to 25 μm, the filament size decreases from 95 nm to 20 nm, respectively, which causes a decrease in the reset current and reset voltage. The results of the nanoscale CAFM measurements have shown a good correlation with the switching parameters obtained by the macroscale pad I–V measurements, thereby, suggesting the origin of resistive switching is due to the formation and rupture of an entity called filament, whose dimension is in nanorange. It is observed that changes in the electrical properties of the overall interface layer along with changes in the electrical conductivity of these filaments contribute towards resistive switching phenomenon. This study suggests that a significant reduction of reset current can be achieved by decreasing the memory device dimensions.
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Halas, N. J. « Connecting the dots : Reinventing optics for nanoscale dimensions ». Proceedings of the National Academy of Sciences 106, no 10 (10 mars 2009) : 3643–44. http://dx.doi.org/10.1073/pnas.0900796106.

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Ozbay, E. « Plasmonics : Merging Photonics and Electronics at Nanoscale Dimensions ». Science 311, no 5758 (13 janvier 2006) : 189–93. http://dx.doi.org/10.1126/science.1114849.

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Ebrahimi, Nader. « Assessing a Linear Nanosystem's Limiting Reliability from its Components ». Journal of Applied Probability 45, no 3 (septembre 2008) : 879–87. http://dx.doi.org/10.1239/jap/1222441834.

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Nanosystems are devices that are in the size range of a billionth of a meter (1 x 10-9) and therefore are built necessarily from individual atoms. The one-dimensional nanosystems or linear nanosystems cover all the nanosized systems which possess one dimension that exceeds the other two dimensions, i.e. extension over one dimension is predominant over the other two dimensions. Here only two of the dimensions have to be on the nanoscale (less than 100 nanometers). In this paper we consider the structural relationship between a linear nanosystem and its atoms acting as components of the nanosystem. Using such information, we then assess the nanosystem's limiting reliability which is, of course, probabilistic in nature. We consider the linear nanosystem at a fixed moment of time, say the present moment, and we assume that the present state of the linear nanosystem depends only on the present states of its atoms.
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Ebrahimi, Nader. « Assessing a Linear Nanosystem's Limiting Reliability from its Components ». Journal of Applied Probability 45, no 03 (septembre 2008) : 879–87. http://dx.doi.org/10.1017/s0021900200004757.

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Nanosystems are devices that are in the size range of a billionth of a meter (1 x 10-9) and therefore are built necessarily from individual atoms. The one-dimensional nanosystems or linear nanosystems cover all the nanosized systems which possess one dimension that exceeds the other two dimensions, i.e. extension over one dimension is predominant over the other two dimensions. Here only two of the dimensions have to be on the nanoscale (less than 100 nanometers). In this paper we consider the structural relationship between a linear nanosystem and its atoms acting as components of the nanosystem. Using such information, we then assess the nanosystem's limiting reliability which is, of course, probabilistic in nature. We consider the linear nanosystem at a fixed moment of time, say the present moment, and we assume that the present state of the linear nanosystem depends only on the present states of its atoms.
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Thèses sur le sujet "Nanoscale Dimensions"

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Pugsley, Lisa M. « Extraordinary Magnetoresistance in Two and Three Dimensions : Geometrical Optimization ». Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/333.

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The extraordinary magnetoresistance (EMR) in metal-semiconductor hybrid structures was first demonstrated using a van der Pauw configuration for a circular semiconductor wafer with a concentric metallic inclusion in it. This effect depends on the orbital motion of carriers in an external magnetic field, and the remarkably high magnetoresistance response observed suggests that the geometry of the metallic inclusion can be optimized to significantly enhance the EMR. Here we consider the theory and simulations to achieve this goal by comparing both two-dimensional as well as three-dimensional structures in an external magnetic field to evaluate the EMR in them. Examples of structures that are compatible with present day technological capabilities are given together with their expected responses in terms of EMR. For a 10 micron 2D square structure with a square metallic inclusion, we see a MR up to 10^7 percent for an applied magnetic field of 1 Tesla.
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Ward, Edmund Peter William. « Three-dimensional analysis of nanoscale structures using electron tomography ». Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611984.

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Jeong, Jae Young. « Heat Transfer in Low Dimensional Materials Characterized by Micro/Nanoscale Thermometry ». Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc1248488/.

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In this study, the thermal properties of low dimensional materials such as graphene and boron nitride nanotube were investigated. As one of important heat transfer characteristics, interfacial thermal resistance (ITR) between graphene and Cu film was estimated by both experiment and simulation. In order to characterize ITR, the micropipette sensing technique was utilized to measure the temperature profile of suspended and supported graphene on Cu substrate that is subjected to continuous wave laser as a point source heating. By measuring the temperature of suspended graphene, the intrinsic thermal conductivity of suspended graphene was measured and it was used for estimating interfacial thermal resistance between graphene and Cu film. For simulation, a finite element method and a multiparameter fitting technique were employed to find the best fitting parameters. A temperature profile on a supported graphene on Cu was extracted by a finite element method using COMSOL Multiphysics. Then, a multiparameter fitting method using MATLAB software was used to find the best fitting parameters and ITR by comparing experimentally measured temperature profile with simulation one. In order to understand thermal transport between graphene and Cu substrate with different interface distances, the phonon density of states at the interface between graphene and Cu substrate was calculated by MD simulation.As another low dimensional material for thermal management applications, the thermal conductivity of BNNT was measured by nanoscale thermometry. For this work, a noble technique combining a focused ion beam (FIB) and nanomanipulator was employed to pick and to place a single BNNT on the desired location. The FIB technology was used to make nanoheater patterns (so called nanothermometer) on a prefabricated microelectrode device by conventional photolithography processes. With this noble technique and the nanoheater thermometry, the thermal conductivity of BNNT was successfully characterized by temperature gradient and heat flow measurements through BNNT.
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Weyland, Matthew. « Two and three dimensional nanoscale analysis : new techniques and applications ». Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/272098.

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Ma, Fengxian. « Computational exploration of structure and electronic functionality in nanoscale materials ». Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/112361/1/Fengxian_Ma_Thesis.pdf.

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This project is a systematic study regarding the discovery and design of nanomaterials with potential applications in electronic devices. It reveals several promising candidates such as a new phase of transition metal dichalcogenides and the two-dimensional ionic boron sheet with novel electronic properties, which enrich the family of two-dimensional materials. The comprehensive calculations would also be a good guidance for the experimental realisation in the near future.
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Jeong, Jae Young. « Heat Transfer in Low Dimensional Materials Characterized by Micro/Nanoscae Thermometry ». Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248488/.

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In this study, the thermal properties of low dimensional materials such as graphene and boron nitride nanotube were investigated. As one of important heat transfer characteristics, interfacial thermal resistance (ITR) between graphene and Cu film was estimated by both experiment and simulation. In order to characterize ITR, the micropipette sensing technique was utilized to measure the temperature profile of suspended and supported graphene on Cu substrate that is subjected to continuous wave laser as a point source heating. By measuring the temperature of suspended graphene, the intrinsic thermal conductivity of suspended graphene was measured and it was used for estimating interfacial thermal resistance between graphene and Cu film. For simulation, a finite element method and a multiparameter fitting technique were employed to find the best fitting parameters. A temperature profile on a supported graphene on Cu was extracted by a finite element method using COMSOL Multiphysics. Then, a multiparameter fitting method using MATLAB software was used to find the best fitting parameters and ITR by comparing experimentally measured temperature profile with simulation one. In order to understand thermal transport between graphene and Cu substrate with different interface distances, the phonon density of states at the interface between graphene and Cu substrate was calculated by MD simulation.As another low dimensional material for thermal management applications, the thermal conductivity of BNNT was measured by nanoscale thermometry. For this work, a noble technique combining a focused ion beam (FIB) and nanomanipulator was employed to pick and to place a single BNNT on the desired location. The FIB technology was used to make nanoheater patterns (so called nanothermometer) on a prefabricated microelectrode device by conventional photolithography processes. With this noble technique and the nanoheater thermometry, the thermal conductivity of BNNT was successfully characterized by temperature gradient and heat flow measurements through BNNT.
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Zhang, Yi. « Three dimensional atom probe tomography of nanoscale thin films, interfaces and particles ». [Ames, Iowa : Iowa State University], 2009.

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Soumyanarayanan, Anjan. « A nanoscale probe of the quasiparticle band structure for two dimensional electron systems ». Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83821.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.
Page 138 blank. Cataloged from PDF version of thesis.
Includes bibliographical references (pages 121-137).
The advent of a broad class of two-dimensional (2D) electronic materials has provided avenues to create and study designer electronic quantum phases. The coexistence of superconductivity, magnetism, density waves, and other ordered phases on the surfaces and interfaces of these 2D materials are governed by interactions which can be experimentally tuned with increasing precision. This motivates the need to develop spectroscopic probes that are sensitive to these tuning parameters, with the objective of studying the electronic properties and emergence of order in these materials. In the first part of this thesis, we report on spectroscopic studies of the topological semimetal antimony (Sb). Our simultaneous observation of Landau quantization and quasiparticle interference phenomena on this material enables their quantitative reconciliation - after two decades of their study on various materials. We use these observations to establish momentum-resolved scanning tunneling microscopy (MR-STM) as a robust nanoscale band structure probe, and reconstruct the multi-component dispersion of Sb(111) surface states. We quantify surface state parameters relevant to spintronics applications, and clarify the relationship between bulk conductivity and surface state robustness. At low momentum, we find a crossover in the single particle behavior from massless Dirac to massive Rashba character - a unique signature of topological surface states. In the second part of this thesis, we report on the spectroscopic study of charge density wave (CDW) order in the dichalcogenide 2H-NbSe2 - a model system for understanding the interplay of coexisting CDW and superconducting phases. We detail the observation of a previously unknown unidirectional (stripe) CDW smoothly interfacing with the familiar triangular CDW on this material. Our low temperature measurements rule out thermal fluctuations and point to local strain as the tuning parameter for this quantum phase transition. The distinct wavelengths and tunneling spectra of the two CDWs, in conjunction with band structure calculations, enable us to resolve two longstanding debates about the anomalous spectroscopic gap and the role of Fermi surface nesting in the CDW phase of NbSe2. Our observations motivate further spectroscopic studies of the phase evolution of the CDW, and of NbSe 2 as a prototypical strong coupling density wave system in the vicinity of a quantum critical point.
by Anjan Soumyanarayanan.
Ph.D.
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Larkin, Adam Lyston. « The Design of Three-Dimensional Multicellular Liver Models Using Detachable, Nanoscale Polyelectrolyte Multilayers ». Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77190.

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We report the design and assembly of three-dimensional (3D) multi-cellular liver models comprised of primary rat hepatocytes, liver sinusoidal endothelial cells (LSECs), and Kupffer cells (KCs). LSECs and KCs in the liver model were separated from hepatocytes by a nanoscale, detachable, optically transparent chitosan and hyaluronic acid (HA) polyelectrolyte multilayer (PEM) film. The properties of the PEM were tuned to mimic the Space of Disse found in liver. The thickness of the detachable PEM was 650 to 1000 nm under hydrated conditions. The Young's modulus of the PEM was approximately 42 kPa, well within the range of modulus values reported for bulk liver. The 3D liver models comprised of all three cell types and a detachable PEM exhibited stable urea production and increased albumin secretion over a 12 day culture period. Additionally, the 3D liver model maintained the phenotype of both LSECs and KCs over the 12 day culture period, verified by CD32b and CD163 staining, respectively. Additionally, CYP1A1 enzyme activity increased significantly in the 3D liver models. The number of hepatocytes in the 3D liver model increased by approximately 60% on day 16 of culture compared to day 4 indicating. Furthermore, only the 3D hepatic model maintained cellular compositions virtually identical to those found in vivo. DNA microarray measurements were conducted on the hepatocyte fractions of the 3D liver mimic to obtain insights into hepatic processes. Gene sets up-regulated in the 3D liver model were related to proliferation, migration, and deposition of extracellular matrix, all functions observed in regenerating hepatocytes. Taken together, these results suggest that inter-cellular signaling between the different cell types in the 3D liver model led to increased hepatic functions. To the best of our knowledge, this is the first study where three of the major hepatic cell types have been incorporated into a model that closely mimics the structure of the sinusoid. These studies demonstrate that the multi-cellular liver models are physiologically relevant. Such models are very promising to conduct detailed investigations into hepatic inter-cellular signaling.
Ph. D.
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Nasseri, Mohsen. « NANOSCALE DEVICES CONSISTING OF HETEROSTRUCTURES OF CARBON NANOTUBES AND TWO-DIMENSIONAL LAYERED MATERIALS ». UKnowledge, 2018. https://uknowledge.uky.edu/physastron_etds/59.

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One dimensional carbon nanotubes (CNTs) and two-dimensional layered materials like graphene, MoS2, hexagonal boron nitride (hBN), etc. with different electrical and mechanical properties are great candidates for many applications in the future. In this study the synthesis and growth of carbon nanotubes on both conducting graphene and graphite substrates as well as insulating hBN substrate with precise crystallographic orientation is achieved. We show that the nanotubes have a clear preference to align to specific crystal directions of the underlying graphene or hBN substrate. On thicker flakes of graphite, the edges of these 2D materials can control the orientation of these carbon nanotubes. This integrated aligned growth of materials with similar lattices provides a promising route to achieving intricate nanoscale electrical circuits. Furthermore, short channel nanoscale devices consisting of the heterostructure of 1D and 2D materials are fabricated. In these nanoscale devices the nanogap is created due to etching of few layer graphene flake through hydrogenation and the channel is either carbon nanotubes or 2D materials like graphene and MoS2. Finally the transport properties of these nanoscale devices is studied.
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Livres sur le sujet "Nanoscale Dimensions"

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Meeting, Materials Research Society, et Symposium II, "Probing Mechanics at Nanoscale Dimensions" (2009 : San Francisco, Calif.), dir. Probing mechanics at nanoscale dimensions : Symposium held April 14-17, 2009, San Francisco, California, U.S.A. Warrendale, PA : Materials Research Society, 2009.

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Ünlü, Hilmi, et Norman J. M. Horing, dir. Progress in Nanoscale and Low-Dimensional Materials and Devices. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93460-6.

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Li, Zhenyu. One-Dimensional nanostructures : Electrospinning Technique and Unique Nanofibers. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013.

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Ünlü, Hilmi. Low Dimensional Semiconductor Structures : Characterization, Modeling and Applications. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013.

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Günter, Wilkening, et Koenders Ludger, dir. Nanoscale calibration standards and methods : Dimensional and related measurements in the micro- and nanometer range. Weinheim : Wiley-VCH, 2005.

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Filatov, D. O. Two-dimensional periodic nanoscale patterning of solid surfaces by four-beam standing wave excimer laser lithography. New York : Nova Science Pub. Inc., 2010.

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Isotope low-dimensional structures : Elementary excitations and applications. Heidelberg : Springer, 2012.

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Bhattacharya, Sitangshu. Effective Electron Mass in Low-Dimensional Semiconductors. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013.

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Friedman, Lawrence, Nobumichi Taumura, Andrew Minor et Conal Murray. Probing Mechanics at Nanoscale Dimensions : Volume 1185. University of Cambridge ESOL Examinations, 2014.

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Tiwari, Sandip. Nanoscale transistors. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198759874.003.0002.

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This chapter brings together the physical underpinnings of field-effect transistors operating in their nanoscale limits. It tackles the change in dominant behavior from scattering-limited long-channel transport to mesoscopic and few scattering events limits in quantized channels. It looks at electrostatics and a transistor’s controllability as dimensions are shrunk—the interplay of geometry and control—and then brings out the operational characteristics in “off”-state, e.g., the detailed nature of insulator’s implications or threshold voltage’s statistical variations grounded in short-range and long-range effects, and “on”-state, where quantization, quantized channels, ballistic transport and limited scattering are important. It also explores the physical behavior for zero bandgap and monoatomic layer materials by focusing on real-space and reciprocal-space funneling as one of the important dimensional change consequences through a discussion of parasitic resistances.
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Chapitres de livres sur le sujet "Nanoscale Dimensions"

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Chakraborty, Tapash. « Down to low dimensions ». Dans Nanoscale Quantum Materials, 9–46. Boca Raton : CRC Press, 2021. http://dx.doi.org/10.1201/9781003090908-2.

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Ashrafuzzaman, Mohammad. « Cell Transport at Nanoscale Dimensions ». Dans Nanoscale Biophysics of the Cell, 237–78. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77465-7_6.

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Chakraborty, Tapash. « Quantum dots : In the abyss of no dimensions ». Dans Nanoscale Quantum Materials, 47–86. Boca Raton : CRC Press, 2021. http://dx.doi.org/10.1201/9781003090908-3.

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Hachtel, Jordan A. « Probing Plasmons in Three Dimensions ». Dans The Nanoscale Optical Properties of Complex Nanostructures, 75–90. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70259-9_5.

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Baek, Rock-Hyun, et Jun-Sik Yoon. « Characterization of Silicon FinFETs under Nanoscale Dimensions ». Dans Semiconductor Devices and Technologies for Future Ultra Low Power Electronics, 115–28. Boca Raton : CRC Press, 2021. http://dx.doi.org/10.1201/9781003200987-5.

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Kumar, Arvind, Swati, Manish Kumar, Neelabh Srivastava et Anadi Krishna Atul. « Nanoscale Characterization ». Dans Fundamentals of Low Dimensional Magnets, 245–68. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003197492-13.

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Menoni, C. S., I. Kuznetsov, T. Green, W. Chao, E. R. Bernstein, D. C. Crick et J. J. Rocca. « Soft X-Ray Laser Ablation Mass Spectrometry for Chemical Composition Imaging in Three Dimensions (3D) at the Nanoscale ». Dans Springer Proceedings in Physics, 221–30. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73025-7_34.

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Ma, Long, et Yong Ni. « CHAPTER 2. Nanoscale Buckling Mechanics of Ultrathin Sheets ». Dans Inorganic Two-dimensional Nanomaterials, 35–55. Cambridge : Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781788010306-00035.

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Peng, Bei, Yugang Sun, Yong Zhu, Hsien-Hau Wang et Horacio Espinosa. « Nanoscale Testing of One-Dimensional Nanostructures ». Dans Micro and Nano Mechanical Testing of Materials and Devices, 280–304. Boston, MA : Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-78701-5_11.

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Buban, Tabea, Sarah Puhl, Peter Burger, Marc H. Prosenc et Jürgen Heck. « Magnetic Properties of One-Dimensional Stacked Metal Complexes ». Dans Atomic- and Nanoscale Magnetism, 89–116. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99558-8_5.

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Actes de conférences sur le sujet "Nanoscale Dimensions"

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Iafrate, Gerald J. « Physics of nanoscale and mesoscopic dimensions : nanoelectronics, beyond and revisited ». Dans New York - DL tentative, sous la direction de Daniel L. Akins et Robert R. Alfano. SPIE, 1992. http://dx.doi.org/10.1117/12.56735.

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Iafrate, Gerald J. « The physics of nanoscale and mesoscopic dimensions ; nanoelectronics, beyond and revisited ». Dans Recent Advances in the Uses of Light in Physics, Chemistry, Engineering, and Medicine. SPIE, 1992. http://dx.doi.org/10.1117/12.2322274.

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Sobhan, C. B., Muhsin M. Ameen et Praveen P. Abraham. « Numerical Modeling of Micro Fin Arrays Using Slip Flow and Temperature Jump Boundary Conditions ». Dans ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52215.

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A numerical investigation of natural convection heat transfer from a rectangular fin array of microscale dimensions, where a “down and up” flow pattern occurs, is carried out. The stream function vorticity formulation is used in the analysis and the governing equations of the transient two dimensional field are solved using an explicit finite difference scheme. The dimensions of the domain are such that the problem falls under the slip flow regime. The non continuum effects are modeled through Maxwell’s velocity slip and Smoluchowski’s temperature jump boundary conditions. The steady state velocity and temperature distributions in the field are obtained by marching through the transient state. The average heat transfer coefficient and the Nusselt Number are calculated. The influence of the fin spacing, fin height and operating pressure on the performance of the fin array is studied through parametric studies and some conclusions are drawn regarding the significance of non continuum effects in the micro scale dimensions considered.
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Velez, Maximiliano A., et Amador M. Guzman. « Study of the Effect of Photonic Crystals on Absorptance and Efficiency of Absorption of Two Organic Photovoltaic Cells by the Finite Element Method ». Dans ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75316.

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The present numerical work describes the simulation and analysis of the absorptance and absorption efficiency of a solar cell, where the effect of utilizing photonic crystals as an active material of the cell was studied. The study was performed by numerical simulations using a computational code based on the Finite Element Method [1]. The results were obtained for photonic crystals with periodicity in both one and two dimensions [2]. In the first one, periodicity, thickness of the active material, and distance with respect to the electrode for hole collection were varied, and two organic materials for the active zone were tested, P3HT:PCBM and TDPT:PCBM. In the case of crystals with periodicity in two dimensions, only the period in one of the two dimensions was varied, based on the cell with the highest efficiency of absorption proposed for cells with periodic photonic crystals in one dimension. All simulations were obtained for waves with TM polarization, zero angle of incidence and wavelengths between 400 and 700 nm.
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Zhang, Conan, et Carlos H. Hidrovo. « Nanoscale Wicking Structures ». Dans ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88416.

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Heat pipes are ubiquitous in various heat transfer applications due to their low maintenance and lack of moving parts. Their simplicity makes them compact and ideally suited for microelectronics use. Recirculation of the coolant in a heat pipe is done passively by means of a wicking structure that induces capillary-driven flow from the condenser to the evaporator. This fluidic scheme is highly desirable but requires precise optimization of the wicking structure geometry to provide the required coolant flow rates under different heat loads. In this paper we present an ab initio model that simulates the capillary flow within a wicking structure of regular and periodic geometry. An energy formulation incorporating capillary equations for pressure gradient and the Stokes flow equation for frictional dissipation were used in the analysis. The feasibility of using nanostructures for capillary-driven flow was assessed using this theoretical analysis. This model is specifically designed to simulate a nanopillar array wick (or nanowick) but was also extended to incorporate commercially available homogenous wicks through the use of a general Darcy’s flow approach. A Darcy’s flow analysis requires knowledge of the porous structure permeability (κ), which must be empirically determined. However, our first principles approach can be used to estimate the effective permeability of various commercial wicks. Only the characteristic structural dimensions of a wick are needed in our model for an accurate estimate of the permeability and the maximum flow rate the wick can sustain without the necessity for an empirical correlation. The results of the theoretical model were corroborated through experimental measurements of baseline mesh wicks and nanowicks. Since the thermal performance of most heat pipes is usually capped by the capillary limit, this threshold was examined for each wick by measuring the mass flow over time at different heat fluxes. At high heat fluxes, the wick cannot sustain the fluid flow necessary for heat removal and burnout occurs. This phenomenon occurs at the thermal capillary limit. The mass flow ceases to increase in the case of burnout and may actually decrease if a disruptive vapor film is created. Experiments show that the baseline wicks were found to have higher mass flow rates when compared to a nanowick due to the difference in thickness of the wicks. However, when the data were normalized to produce velocity values, the nanowick was found to have a higher velocity than most of the baseline wicks. These experimental results were weighed against the theoretical model results showing very good agreement of the two.
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Bennett, Jean M., Mecky Puiu, Van A. Hodgkin et Thomas McWaid. « Step Height Standards for Calibrating an AFM/STM ». Dans Microphysics of Surfaces : Nanoscale Processing. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.mthd4.

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Calibration of an AFM/STM requires step standards calibrated on another type of instrument. Typically this is a mechanical stylus profiler that has been calibrated using step height standards that have been measured with an optical interferometer. Since the bar dimensions are a few micrometers wide and a few tens of nanometers high, standard Fizeau-type optical interferometers cannot be used. Several types of optical profilers are suitable for the measurements. The question is, to what accuracy can a step ~20 to 100 nm high be measured? Intercomparisons between instruments in different laboratories suggest that a reasonable value for the accuracy is no better than 1% of the step height value. Examples will be shown and systematic errors relating to specific instruments will be discussed.
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Montazeri, Kimia, Penghui Cao et Yoonjin Won. « Molecular Dynamics Investigation of Water Behavior Through Nanopores ». Dans ASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipack2020-2699.

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Abstract The transport of fluids through nanoscale pores, channels, and membranes has been of great importance in our daily life. Nanoscale transport is relevant to many applications such as agriculture, energy and environmental fields. Considering these applications, it is important to characterize detailed mechanisms of liquid transport through nanoscale defects and pores on surfaces. Such characterization requires a detailed understanding of the deviation of water behavior and its transport mechanisms in nanoscale from bulk water. Molecular dynamics provide proper means to understand the dynamics and mechanisms of motions of water molecules confined in ultra-small spaces. This work examines the water transport through an individual pore which has a nanoscale dimensions ranging from 1.0 to 1.8 nm from molecular dynamics perspective. The effects of the nanopore dimensions as well as the surface wetting properties on the behavior of confined water are studied. The translational and rotational dynamics of water molecules are characterized by examining velocity autocorrelation functions and the calculation of the density of states, which supports the presence of unusual, solid-like behaviors of water molecules. A good understanding of the transport mechanisms and their origins are crucial to address common challenges in many engineering applications such as energy storage and conversion and could pave the way towards more efficient water-energy systems.
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Marrian, Christie R. K. « Electron Beam Nanolithography ». Dans Microphysics of Surfaces : Nanoscale Processing. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.mthb1.

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Motivated by trends in the microelectronics industry and the quest to investigate electronic and material properties in the quantum effect size regime, there is a strong drive to understand and overcome the limits of the processing required for microfabrication. At the beginning of the next century, the precision required in feature sizes for microelectronics manufacturing is projected to be close to 10 nm, i.e. about 25 atomic diameters. Still smaller feature sizes are needed for nanoelectronic device research. For example, to observe effects such as lateral resonant tunneling and coulomb blockade at close to room temperature, feature sizes below 10 nm are necessary. Central to any fabrication scheme for these dimensions is a lithographic step where a pattern is defined in a radiation sensitive material, commonly called the resist, and then replicated into the substrate to define a structure or device. Due to the availability of equipment and knowledge base, the preferred means for defining the smallest possible structures involves the use of a focused high energy beam of electrons.
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Yoo, Gwan Min, Jae Hwa Seo, Young Jun Yoon, Young Jae Kim, Sung Yoon Kim, Hye Su Kang, Hye Rim Eun et al. « Dependence of device performances on fin dimensions in AlGaN/GaN recessed-gate nanoscale FinFET ». Dans 2014 International Symposium on Consumer Electronics (ICSE). IEEE, 2014. http://dx.doi.org/10.1109/isce.2014.6884475.

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Chaudhri, Anuj, et Jennifer R. Lukes. « Multicomponent Energy Conserving Dissipative Particle Dynamics : A General Framework for Mesoscopic Heat Transfer Applications ». Dans ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52218.

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The energy conserving formulation of the Dissipative Particle Dynamics (DPD) mesoscale method for multicomponent systems is analyzed thoroughly. A new framework is established by identifying the dimensionless groups using general scaling factors. When the scaling factors are chosen based on the solvent in a multicomponent system, the reduced system of equations can easily be solved computationally. Simulation results are presented for one dimensional transient and steady-state heat conduction in a random DPD solid, which compare well with existing published and analytical solutions. This model is extended to two dimensions and shows excellent agreement with the analytical solution.
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Rapports d'organisations sur le sujet "Nanoscale Dimensions"

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Miao, Jianwei. Three-dimensional imaging of nanoscale materials by using coherent x-rays. Office of Scientific and Technical Information (OSTI), avril 2011. http://dx.doi.org/10.2172/1011392.

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Nurmikko, Arto V. Optically Active 3-Dimensional Semiconductor Quantum Dot Assemblies in Heterogeneous Nanoscale Hosts. Office of Scientific and Technical Information (OSTI), mai 2017. http://dx.doi.org/10.2172/1355658.

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Hong, Xia. Final Report on "Nanoscale Ferroelectric Control of Novel Electronic States in Layered Two-Dimensional Materials". Office of Scientific and Technical Information (OSTI), mars 2023. http://dx.doi.org/10.2172/1964211.

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