Relevant bibliographies by topics / Nanostructures

Academic literature on the topic 'Nanostructures'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 August 2024

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Journal articles on the topic "Nanostructures"

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Gerbreders, V., M. Krasovska, I. Mihailova, E. Sledevskis, A. Ogurcovs, E. Tamanis, V. Auksmuksts, A. Bulanovs, and V. Mizers. "Morphology Influence on Wettability and Wetting Dynamics of ZnO Nanostructure Arrays." Latvian Journal of Physics and Technical Sciences 59, no. 1 (February 1, 2022): 30–43. http://dx.doi.org/10.2478/lpts-2022-0004.

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Abstract Changes in nanostructure morphology and size may result in very different surface wettability. In this research, the impact of different morphological parameters on the wetting dynamics of ZnO nanostructured layers is studied. Six different morphologies are chosen to determine the specific wetting processes of ZnO nanostructures: nanoneedles, small diameter rods, large diameter rods, nanotubes, nanoplates, and plain thin films. Wetting dynamics is investigated using conventional sessile drop technique and a novel approach based on electrochemical impedance spectroscopy. The results show that the surface of nanostructured ZnO thin films exhibits both hydrophilic and hydrophobic wetting behaviour, depending on nanostructure form, size, and orientation. ZnO nanostructure arrays are a promising platform for electrochemical and optical sensing in aqueous solutions. The full and effective use of the sensor working surface can be ensured only under the condition of complete wetting of the nanostructured layer. Therefore, it is important to take into account the peculiarities of the wetting process of a specific morphology of nanostructures.
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Hamza, Mohammed Salab, Suaad Salim Shaker, and Khitam Salim Shaker. "Preparation and Study of morphological properties of ZnO nano Powder." Journal of Engineering 22, no. 4 (April 1, 2016): 116–26. http://dx.doi.org/10.31026/j.eng.2016.04.08.

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In this work, ZnO nanostructures for powder ZnO were synthesized by Hydrothermal Method. Size and shape of ZnO nanostructureas can be controlled by change ammonia concentration. In the preparation of ZnO nanostructure, zinc nitrate hexahydrate [Zn(NO3)2·6H2O] was used as a precursor. The structure and morphology of ZnO nanostructure have been characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD). The synthesized ZnO nanostructures have a hexagonal wurtzite structure. Also using Zeta potential and Particle Size Analyzers and size distribution of the ZnO powder
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Yang, Ming, Xiaohua Chen, Zidong Wang, Yuzhi Zhu, Shiwei Pan, Kaixuan Chen, Yanlin Wang, and Jiaqi Zheng. "Zero→Two-Dimensional Metal Nanostructures: An Overview on Methods of Preparation, Characterization, Properties, and Applications." Nanomaterials 11, no. 8 (July 23, 2021): 1895. http://dx.doi.org/10.3390/nano11081895.

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Metal nanostructured materials, with many excellent and unique physical and mechanical properties compared to macroscopic bulk materials, have been widely used in the fields of electronics, bioimaging, sensing, photonics, biomimetic biology, information, and energy storage. It is worthy of noting that most of these applications require the use of nanostructured metals with specific controlled properties, which are significantly dependent on a series of physical parameters of its characteristic size, geometry, composition, and structure. Therefore, research on low-cost preparation of metal nanostructures and controlling of their characteristic sizes and geometric shapes are the keys to their development in different application fields. The preparation methods, physical and chemical properties, and application progress of metallic nanostructures are reviewed, and the methods for characterizing metal nanostructures are summarized. Finally, the future development of metallic nanostructure materials is explored.
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Zhang, Shiying, Huizhao Zhuang, Chengshan Xue, and Baoli Li. "Effect of Annealing on Morphology and Photoluminescence of β-Ga2O3 Nanostructures." Journal of Nanoscience and Nanotechnology 8, no. 7 (July 1, 2008): 3454–57. http://dx.doi.org/10.1166/jnn.2008.138.

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A novel method was applied to prepare one-dimensional β-Ga2O3 nanostructure films. In this method, β-Ga2O3 nanostructures have been successfully synthesized on Si(111) substrates through annealing sputtered Ga2O3/Mo films for differernt time under flowing ammonia. The as-synthesized β-Ga2O3 nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results show that the formed nanostructures are single-crystalline Ga2O3 with monoclinic structure. The annealing time of the samples has an evident influence on the morphology and optical property of the nanostructured β-Ga2O3 synthesized. The representative photoluminescence spectrum at room temperature exhibits a strong and broad emission band centered at 411.5 nm and a relatively weak emission peak located at 437.6 nm. The growth mechanism of the β-Ga2O3 nanostructured materials is also discussed briefly.
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Wang, Ying, and Guo Zhong Cao. "Synthesis and Electrochemical Properties of V2O5 Nanostructures." Key Engineering Materials 336-338 (April 2007): 2134–37. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.2134.

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In this seminar, I will present our recent work on the growth and electrochemical properties of single crystalline vanadium pentoxide (V2O5) nanorod and Ni-V2O5·nH2O nanocable arrays. These nanostructures were prepared by solution synthesis and template-based electrodeposition. Processing, morphology, structure and electrochemical properties of these nanostructures will be discussed. These nanostructured electrodes of vanadium pentoxide demonstrate significantly enhanced intercalation capcity and charge/discharge rate compared to the plain film electrodes, due to the high surface area and short diffusion distance offered by nanostructure.
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Maciulis, Vincentas, Almira Ramanaviciene, and Ieva Plikusiene. "Recent Advances in Synthesis and Application of Metal Oxide Nanostructures in Chemical Sensors and Biosensors." Nanomaterials 12, no. 24 (December 10, 2022): 4413. http://dx.doi.org/10.3390/nano12244413.

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Nanostructured materials formed from metal oxides offer a number of advantages, such as large surface area, improved mechanical and other physical properties, as well as adjustable electronic properties that are important in the development and application of chemical sensors and biosensor design. Nanostructures are classified using the dimensions of the nanostructure itself and their components. In this review, various types of nanostructures classified as 0D, 1D, 2D, and 3D that were successfully applied in chemical sensors and biosensors, and formed from metal oxides using different synthesis methods, are discussed. In particular, significant attention is paid to detailed analysis and future prospects of the synthesis methods of metal oxide nanostructures and their integration in chemical sensors and biosensor design.
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Nocua, José E., Fabrice Piazza, Brad R. Weiner, and Gerardo Morell. "High-Yield Synthesis of Stoichiometric Boron Nitride Nanostructures." Journal of Nanomaterials 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/429360.

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Boron nitride (BN) nanostructures are structural analogues of carbon nanostructures but have completely different bonding character and structural defects. They are chemically inert, electrically insulating, and potentially important in mechanical applications that include the strengthening of light structural materials. These applications require the reliable production of bulk amounts of pure BN nanostructures in order to be able to reinforce large quantities of structural materials, hence the need for the development of high-yield synthesis methods of pure BN nanostructures. Using borazine (B3N3H6) as chemical precursor and the hot-filament chemical vapor deposition (HFCVD) technique, pure BN nanostructures with cross-sectional sizes ranging between 20 and 50 nm were obtained, including nanoparticles and nanofibers. Their crystalline structure was characterized by (XRD), their morphology and nanostructure was examined by (SEM) and (TEM), while their chemical composition was studied by (EDS), (FTIR), (EELS), and (XPS). Taken altogether, the results indicate that all the material obtained is stoichiometric nanostructured BN with hexagonal and rhombohedral crystalline structure.
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Moon, Seung Kyun, Jae Sung Kwon, Seong Wan Baik, Gye Rok Jeon, Jung Hoon Ro, Tae Gwan Eom, and Kyoung Nam Kim. "Surface Characteristics of Nanostructure Formed on Sand Blasted with Large Grit and Acid Etched Dental Implant." Advanced Materials Research 647 (January 2013): 80–87. http://dx.doi.org/10.4028/www.scientific.net/amr.647.80.

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The purpose of this study was to apply nanotechnology to dental implant for improved osseointegration. Titania nanostructures were fabricated on the sand blasted with large grit and acid etched (SA) titanium (ASTM grade 4) implants (TSIII SA®, Osstem, 3.5 x 5 mm) using potentiostatic anodic oxidation in HF. The nanostructures were uniformly formed on the SA surface. The mean pore size of nanostructure was about 30 nm. In the result of torque test, the nanostructure formed on SA surface was preserved from the torque, even after the loading of 40Ncm. An amorphous titania nanostructure was annealed at 400 °C. Through heat treatment, the amorphous titania nanostructure was turned into anatase phase. Hydrofluoric acid was used as the electrolyte to form nanostructure. In the result of ion release test, however, fluoride ions were not detected at the heat treated group. Therefore, such nanostructured SA implant (Nano-SA) will be suitable for dental implant.
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Cho, Seong J., Se Yeong Seok, Jin Young Kim, Geunbae Lim, and Hoon Lim. "One-Step Fabrication of Hierarchically Structured Silicon Surfaces and Modification of Their Morphologies Using Sacrificial Layers." Journal of Nanomaterials 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/289256.

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Fabrication of one-dimensional nanostructures is a key issue for optical devices, fluidic devices, and solar cells because of their unique functionalities such as antireflection and superhydrophobicity. Here, we report a novel one-step process to fabricate patternable hierarchical structures consisting of microstructures and one-dimensional nanostructures using a sacrificial layer. The layer plays a role as not only a micromask for producing microstructures but also as a nanomask for nanostructures according to the etching time. Using this method, we fabricated patterned hierarchical structures, with the ability to control the shape and density of the nanostructure. The various architectures provided unique functionalities. For example, our sacrificial-layer etching method allowed nanostructures denser than what would be attainable with conventional processes to form. The dense nanostructure resulted in a very low reflectance of the silicon surface (less than 1%). The nanostructured surface and hierarchically structured surface also exhibited excellent antiwetting properties, with a high contact angle (>165°) and low sliding angle (<1°). We believe that our fabrication approach will provide new insight into functional surfaces, such as those used for antiwetting and antireflection surface applications.
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Reddy, G. S., Mallikarjuna N. Nadagouda, and Jainagesh A. Sekhar. "Nanostructured Surfaces that Show Antimicrobial, Anticorrosive, and Antibiofilm Properties." Key Engineering Materials 521 (August 2012): 1–33. http://dx.doi.org/10.4028/www.scientific.net/kem.521.1.

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Provided in this article are the quantitative and qualitative morphological results describing the action of several nanostructured surfaces for bactericidal and bacteriostatic action. Results are also provided to illustrate microbial corrosion and its impact. Biofilm formation is correlated to colony formation. Nanostructured surfaces, i.e. surfaces with welded nanoparticles are noted to display biocidal activity with varying efficacies. Porous nanostructures, on stainless steel and copper substrates, made of high purity Ag, Ti, Al, Cu, MoSi2, and carbon nanotubes, are tested for their efficacy against bacterial colony formation for both gram-negative, and gram-positive bacteria. Silver and Molybdenum disilicide (MoSi2) nanostructures are found to be the most effective bactericidal agents with MoSi2 being particularly effective in both low and high humidity conditions. Bacteriostatic activity is also noted. The nanostructured surfaces are tested by controlled exposures to several microbial species including (Gram+ve) bacteria such as Bacillus Cereus and (Gram-ve) bacteria such as Enterobacter Aerogenes. The resistance to simultaneous exposure from diverse bacterial species including Arthrobacter Globiformis, Bacillus Megaterium, and Cupriavidus Necator is also studied. The nanostructured surfaces were found to eliminates or delay bacterial colony formation, even with short exposure times, and even after simulated surface abrasion. The virgin 316 stainless steel and copper substrates, i.e. without the nanostructure, always displayed rapid bacterial colony evolution indicating the lack of antimicrobial action. The efficacy of the nanostructured surface against colony formation (bacterial recovery) for E-Coli (two strains) and virus Phi 6 Bacteriophage with a host Pseudomonas Syringae was also studied. Preliminary results are presented that also show possible anti-fungal properties by the nanostructured MoSi2. When comparing antimicrobial efficacy of flat polished surfaces (no curvature or nanostructure) with nanostructure containing surfaces (high curvature) of the same chemistry, shows that bacterial action results from both the nanostructure size and chemistry.
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Dissertations / Theses on the topic "Nanostructures"

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Chang, Sehoon. "Organic/inorganic hybrid nanostructures for chemical plasmonic sensors." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39545.

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The work presented in this dissertation suggests novel design of chemical plasmonic sensors which have been developed based on Localized Surface Plasmon Resonance (LSPR), and Surface-enhanced Raman scattering (SERS) phenomena. The goal of the study is to understand the SERS phenomena for 3D hybrid (organic/inorganic) templates and to design of the templates for trace-level detection of selected chemical analytes relevant to liquid explosives and hazardous chemicals. The key design criteria for the development of the SERS templates are utilizing selective polymeric nanocoatings within cylindrical nanopores for promoting selective adsorption of chemical analyte molecules, maximizing specific surface area, and optimizing concentration of hot spots with efficient light interaction inside nanochannels. The organic/inorganic hybrid templates are optimized through a comprehensive understanding of the LSPR properties of the gold nanoparticles, gold nanorods, interaction of light with highly porous alumina template, and the choice of physical and chemical attributes of the selective coating. Furthermore, novel method to assemble silver nanoparticles in 3D as the active SERS-active substrate has been demonstrated by uniform, in situ growth of silver nanoparticles from electroless deposited silver seeds excluding any adhesive polymer layer on template. This approach can be the optimal for SERS sensing applications because it is not necessary to separate the Raman bands of the polyelectrolyte binding layer from those of the desired analyte. The fabrication method is an efficient, simple and fast way to assemble nanoparticles into 3D nanostructures. Addressable Raman markers from silver nanowire crossbars with silver nanoparticles are also introduced and studied. Assembly of silver nanowire crossbar structure is achieved by simple, double-step capillary transfer lithography. The on/off SERS properties can be observed on silver nanowire crossbars with silver nanoparticles depending on the exact location and orientation of decorated silver nanoparticles nearby silver nanowire crossbars. As an alternative approach for the template-assisted nanostructure design, porous alumina membrane (PAM) can be utilized as a sacrificial template for the fabrication of the nanotube structure. The study seeks to investigate the design aspects of polymeric/inorganic hybrid nanotube structures with plasmonic properties, which can be dynamically tuned by external stimuli such as pH. This research suggests several different organic/inorganic nanostructure assemblies by various template-assisted techniques. The polymeric/inorganic hybrid nanostructures including SERS property, pH responsive characteristics, and large surface area will enable us to understand and design the novel chemical plasmonic sensors.
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Wiley, Benjamin J. "Synthesis of silver nanostructures with controlled shapes and properties /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/9923.

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Jin, Kewang. "Fabrication and characterization of 1D oxide nanostructures /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20JIN.

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Srivastava, Devesh. "Fabrication of nanostructures and nanostructure based interfaces for biosensor application." Diss., Connect to online resource - MSU authorized users, 2008.

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Bude, Romain. "Synthèses et caractérisations de matériaux thermoélectriques nanostructurés." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC032/document.

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Les marchés de la thermoélectricité sont en pleine expansion avec l’intérêt croissant pour la récupération d’énergie thermique ou encore pour la gestion de la température de composants électroniques. En dépit de ses nombreux avantages, le développement de cette technologie est freiné par les performances des matériaux. Une voie d’amélioration identifiée est leur nanostructuration afin d’en diminuer la conductivité thermique de réseau.Dans ce travail de thèse, cette voie est appliquée au tellurure de bismuth, matériau connu pour posséder les meilleures performances autour de la température ambiante. Les matériaux sont obtenus par synthèse de nanoparticules en solution avant d’être mis en forme par pressage à chaud.Une première étude est réalisée sur la recherche d’un optimum de la taille de grain dans le massif. On montre que le contrôle des conditions de synthèse permet le contrôle des dimensions des nanoparticules. Par ailleurs, les analyses structurales et fonctionnelles des massifs après densification montrent que la variation de la taille initiale des particules permet le contrôle de la microstructure et des propriétés detransport des massifs.Une seconde étude porte sur la recherche d’un optimum en composition des matériaux Bi2Te3-xSex. Les analyses morphologiques mettent en évidence une structure complexe et particulière, laissant apparaitre la présence de trois phases dans les massifs.Les matériaux obtenus par cette méthode de synthèse possèdent a priori des propriétés de transport anisotropes. La caractérisation de leurs performances thermoélectriques est donc difficile. Plusieurs techniques de caractérisation sont mises en oeuvre afin de mieux connaitre leurs conductivités thermiques. Celles-ci sont faibles, ce qui montre l’intérêt de l’approche. Toutefois, leur conductivité électrique est plus basse que leurs homologues obtenus par des techniques plus conventionnelles. On montre néanmoins que l’optimisation des conditions de synthèse des particules entrant dans la composition des massifs alliés permet d’améliorer leurs propriétés électriques et donc leurs performances thermoélectriques
The global thermoelectric markets are in expansion with a growing interest for the energy harvesting or the thermal management of electronic components. Despite numerous advantages, this technology development is limited by the materials performances. A way to improve them is to use nanostructures in order to decrease the lattice thermal conductivity.In this work, this approach is applied to bismuth telluride, material well known for its high performance around room temperature. Materials are obtained from solution synthesis of nanoparticles before hot press compaction.A first study focuses on the determination of an optimal grain size in the bulk materials. It is shown that control over the synthesis parameters allows control on the size of nanoparticles.Moreover, structural and physical analyses on the bulks after sintering show that the change of thesynthesis parameters allows control over the microstructure and thermoelectric properties of the bulks.A second study is based on the study of an optimal composition of Bi2Te3-xSex materials. Morphological analysis show a specific and complex structure with three phases in the bulks.It is postulated that these materials should have anisotropic transport properties. Consequently, their characterizations are difficult. Different characterization techniques are used in order to have a better understanding of their thermal conductivities. Thermal conductivity of the bulks is found low which confirm the interest of this approach. However the electrical conductivity is lower than the one of the materials obtained by more conventional methods. We show that the synthesis parameters of the particles can be optimized to increase the thermoelectric performances of the bulk materials
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Akinyeye, Richard Odunayo. "Nanostructured polypyrrole impedimetric sensors for anthropogenic organic pollutants." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5301_1248150815.

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The main aim of this study was to develop a novel strategy for harnessing the properties of electroconductive polymers in sensor technology by using polymeric nanostructured blends in the preparation of high performance sensor devices.

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Mitchell, James Christopher. "DNA nanostructures." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400206.

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Finbow, Gerard Mark. "Modelling nanostructures." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624252.

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Ventura, João Oliveira. "Magnetic nanostructures." Doctoral thesis, Porto : edição do autor, 2006. http://hdl.handle.net/10216/64289.

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Ventura, João Oliveira. "Magnetic nanostructures." Tese, Porto : edição do autor, 2006. http://catalogo.up.pt/F?func=find-b&local_base=FCB01&find_code=SYS&request=000093736.

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Books on the topic "Nanostructures"

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Delerue, Christophe, and Michel Lannoo. Nanostructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08903-3.

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Diudea, Mircea V., and Csaba L. Nagy, eds. Periodic Nanostructures. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6020-5.

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Bindewald, Eckart, and Bruce A. Shapiro, eds. RNA Nanostructures. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7138-1.

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Zabel, Hartmut, and Michael Farle, eds. Magnetic Nanostructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32042-2.

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Wang, Zhiming M., ed. FIB Nanostructures. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02874-3.

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Aktaş, Bekir, Faik Mikailov, and Lenar Tagirov, eds. Magnetic Nanostructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49336-5.

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Xiong, Yujie, and Xianmao Lu, eds. Metallic Nanostructures. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-11304-3.

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Seal, Sudipta, ed. Functional Nanostructures. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-48805-9.

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Abd-Elsalam, Kamel A., Mohamed A. Mohamed, and Ram Prasad, eds. Magnetic Nanostructures. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16439-3.

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Bimberg, Dieter, ed. Semiconductor Nanostructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-77899-8.

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Book chapters on the topic "Nanostructures"

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Grundmann, Marius. "Nanostructures." In Graduate Texts in Physics, 397–423. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13884-3_13.

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Chantrenne, Patrice, Karl Joulain, and David Lacroix. "Nanostructures." In Thermal Nanosystems and Nanomaterials, 17–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04258-4_2.

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Moore, Elaine A., and Lesley E. Smart. "Nanostructures." In Solid State Chemistry, 363–90. Fifth edition. | Boca Raton : CRC Press, [2021]: CRC Press, 2020. http://dx.doi.org/10.1201/9780429027284-11.

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Grundmann, Marius. "Nanostructures." In Graduate Texts in Physics, 401–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51569-0_14.

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Grundmann, Marius. "Nanostructures." In Graduate Texts in Physics, 461–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23880-7_14.

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Delerue, Christophe, and Michel Lannoo. "General Basis for Computations and Theoretical Models." In Nanostructures, 1–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08903-3_1.

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Delerue, Christophe, and Michel Lannoo. "Quantum Confined Systems." In Nanostructures, 47–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08903-3_2.

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Delerue, Christophe, and Michel Lannoo. "Dielectric Properties." In Nanostructures, 77–103. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08903-3_3.

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Delerue, Christophe, and Michel Lannoo. "Quasi-particles and Excitons." In Nanostructures, 105–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08903-3_4.

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Delerue, Christophe, and Michel Lannoo. "Optical Properties and Radiative Processes." In Nanostructures, 141–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08903-3_5.

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Conference papers on the topic "Nanostructures"

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Shibahara, Masahiko, and Kiyoshi Takeuchi. "A Molecular Dynamics Study on the Effects of Nanostructural Clearances on Thermal Resistance at a Liquid-Solid Interface." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22152.

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The effects of the surface structures and the surface structural clearances at the nanometer scale on the thermal resistance at a liquid water-solid interface, as well as the self-diffusion behaviors of liquid molecules, were investigated directly by the non-equilibrium classical molecular dynamics simulations. When the potential parameter between liquid molecules and nanostructure atoms is equal to that between liquid molecules and solid wall atoms, the geometric surface area change depending on the nanostructures as well as their clearances and the self-diffusion coefficient change of the liquid molecules at the interface depending on the nanostructural clearances cause the thermal resistance change depending on the nanostructures at the liquid-solid interface. When the potential parameter between liquid molecules and nanostructure atoms is different from that between liquid molecules and solid wall atoms, the interfacial thermal resistance is dependent on the potential parameter between liquid molecules and nanostructure atoms itself rather than the geometric surface area in a molecular scale.
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Shibahara, Masahiko, and Kiyoshi Takeuchi. "A Molecular Dynamics Study on the Effects of Nanostructural Clearances on Thermal Resistance at a Liquid-Solid Interface." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18197.

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The effects of the surface structures and the surface structural clearances at the nanometer scale on the thermal resistance at a liquid water-solid interface, as well as the dynamic behaviors of liquid molecules, were investigated directly by the classical molecular dynamics simulations. The thermal resistance between the solid wall and the liquid region was calculated by the temperature discontinuity at a liquid-solid interface and the energy flux that was added or subtracted by the Langevin method per unit area so as to maintain a constant solid wall temperature. When the potential parameter between liquid molecules and nanostructure atoms is equal to that between liquid molecules and solid wall atoms, the geometric surface area change depending on the nanostructures as well as their clearances and the dynamic behaviour change of the fluid molecules at the interface depending on the nanostructural clearances cause the thermal resistance reduction depending on the nanostructures at the liquid-solid interface. When the potential parameter between liquid molecules and nanostructure atoms is different from that between liquid molecules and solid wall atoms, the thermal resistance at the interface is dependent on the potential parameter between liquid molecules and nanostructure atoms rather than the geometric surface area in a molecular scale depending on the nanostructures as well as their clearances.
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Li, H., K. A. Khor, and P. Cheang. "Nanostructures in Thermal Sprayed Hydroxyapatite (HA) and HA/Nano-Zirconia Coatings and their Influence on Coating Properties." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0845.

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Abstract Nanostructured hydroxyapatite (HA) and HA/nano-zirconia powders were sprayed by both plasma and HVOF spraying. Microstructure characterization on the nanostructured coatings were conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometry (XRD), and Raman spectroscopy. Results showed that the nanostructures of the HA feedstock retained to some extent after the thermal spraying depending on the melt state of the powders. The microstructural features of individual HA splats were also characterized through TEM observing both as-sprayed and ion-milled splats. A nanostructure (with ~ 30nm grains) within the surrounding parts of the HA splats was revealed, while significant grain growth (a size up to 5 µm) depending on flattening state was found at the center of the splats. It also revealed that the nano-sized zirconia particles (&lt; 90 nm) retained their fine size after HVOF deposition, and were evenly distributed within the coating. The crystallite size of tetragonal zirconia in the coating was found to be less than 13 nm. The biocompatibility of the coatings was characterized using in vitro incubation testing in simulated body fluid and osteoblast cell culturing. It showed that the presence of the nanostructures in the coatings improved the stability of the coatings (delayed the dissolution). The addition, the presence of the nanostructures contributes to improved mechanical properties.
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Kannan, Balaji, and Arun Majumdar. "Novel Microfabrication Techniques for Highly Specific Programmed Assembly of Nanostructures." In ASME 2004 3rd Integrated Nanosystems Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/nano2004-46053.

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Chemically synthesized nanostructures such as nanowires1, carbon nanotubes2 and quantum dots3 possess extraordinary physical, electronic and optical properties that are not found in bulk matter. These characteristics make them attractive candidates for building subsequent generations of novel and superior devices that will find application in areas such as electronics, photonics, energy and biotechnology. In order to realize the full potential of these nanoscale materials, manufacturing techniques that combine the advantages of top-down lithography with bottom-up programmed assembly need to be developed, so that nanostructures can be organized into higher-level devices and systems in a rational manner. However, it is essential that nanostructure assembly occur only at specified locations of the substrate and nowhere else, since otherwise undesirable structures and devices will result. Towards this end, we have developed a hybrid micro/nanoscale-manufacturing paradigm that can be used to program the assembly of nanostructured building blocks at specific, pre-defined locations of a chip in a highly parallel fashion. As a prototype system we have used synthetic DNA molecules and gold nanoparticles modified with complementary DNA strands as the building blocks to demonstrate the highly selective and specific assembly of these nanomaterials on lithographically patterned substrates.
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Smith, Sheriden, and Young Ho Park. "Hydrogen Storage Using Carbon Nanostructures." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45019.

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Carbon nanostructures were reported to be very promising materials for hydrogen storage, and a great deal of interest has been focused on adsorption of molecular hydrogen in carbon nanostructures. Although many experimental results for hydrogen storage in carbon nanostructures were reported, corresponding theoretical studies have not been developed and adsorption mechanisms have not been fully identified. Better understanding of molecular level phenomena provides clues to designing hydrogen storage that performs better. Atomic simulations are useful in the evaluation of hydrogen storage capacity of carbon nanotubes. In this paper, molecular simulations of hydrogen physisorption in carbon nanotubes were conducted. Hydrogen density distribution near carbon nanotubes was studied, and hydrogen storage capability is determined by computing hydrogen to carbon atom ratio. The peak hydrogen concentration around the nanostructures was simulated to be located relatively consistently around 3 angstroms away from each nanostructure.
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Ignácio, Isabela, Elaine Maria Cardoso, José Luiz Gasche, and Gherhardt Ribatski. "A State-of-the-Art Review on Pool Boiling on Nanostructure Surfaces." In ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/icnmm2015-48120.

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The differences in the heat transfer coefficient (HTC) and critical heat flux (CHF) behaviors between nanostructured and smooth surfaces are attributed to modifications on the surface wettability and capillarity effects through the porous matrix generated by the nanostructure layer. Both act in order of improving rewetting effects, explaining the CHF augmentation. The fact that the contact angle decreases is commonly considered to justify the HTC reduction for nanostructured surfaces. In this context, this study presents a critical review of the literature concerning the boiling phenomena on nanostructures surfaces. Care is exercised in order of characterizing the nanostructuring methods and compare heat transfer results obtained under almost similar conditions by different authors. Heat transfer mechanisms pointed in the literature as responsible for the heat transfer behaviors are also contrasted.
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Warren, A. W., and Y. B. Guo. "The Influence of Residual Stress and Tip Geometry on the Measurement of Surface Property Using Nanoindentation: Experimental Study and Numerical Analysis." In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70156.

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This study focuses on the basic relationships between nanohardness, residual stress, and micro/nanostructure of precision machined surfaces of high carbon steels. A series of nanoindentation tests were conducted on the cross-sections of the precision machined surfaces with ultrafine-grains or nanostructures. It was found that the nanostructured white layer significantly increases nanohardness, while the ultrafine-grained layer only slightly increases surface hardness. Residual stress affects the load-displacement curve shape at the onset of material yielding. Nanostructure makes a significant difference on the characteristics of a load-displacement curve, while ultrafine-grained structure exerts a slight influence. The influence of residual stress on the load-displacement curve can be estimated by finite element simulation of a nanoindentation. The simulation sensitivity analysis shows that the load-displacement curves are significantly affected by residual stress.
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Nayfeh, Yousof, Syed Muhammad Mujtaba Rizvi, Baha El Far, and Donghyun Shin. "Nanostructure Fabrication in Oil Media for Enhanced Thermophysical Properties." In ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1711.

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Abstract Recently, researchers have focused on molten-salt-based nanofluids, relying on their unique ability to form special fractallike nanostructures due to the interaction between molten salt ionic molecules and the nanoparticles. These nanostructures are thought to be causing the observed heat capacity enhancement. Thus far, this phenomenon was believed to be exclusive to molten salt nanofluids. In this study, the nanostructure observed in molten-salt-based nanofluids is mimicked, and similar fractallike nanostructures were formed in-situ in polyalphaolefin (PAO) oil as the base fluid by dispersing alumina (Al2O3) nanoparticles (1% wt. concentration) in the PAO and adding hydroxyl-ended polymer (PPG) (1% wt. concentration) as surfactants to form “artificial” nanostructures by ionically bonding to the nanoparticle’s surface. The effect of these artificial nanostructures was studied to confirm that they affect the base fluid similar to the nanostructures formed in molten salt nanofluids. Results showed an increase of 4.86% in heat capacity, and a 42% increase in viscosity was measured at high shear rates, as well as a noticeable non-Newtonian rheological behavior at low shear rates. These results show that the nanostructure has formed and that the thermophysical and rheological properties of the oil have been affected as expected.
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Demir, Ebru, Muhsincan Sesen, Turker Izci, Wisam Khudhayer, Tansel Karabacak, and Ali Kosar. "Subcooled Flow Boiling Over Nanostructured Plate Integrated Into a Rectangular Channel." In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73154.

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Sub-cooled flow boiling was investigated over nanostructured plate (of dimensions 20mm×20mm) integrated to a rectangular channel (of dimensions 33mm×9mm×33mm) at flow rates ranging from 69 ml/min to 145 ml/min. The configuration of the nanostructured plate includes ∼600 nm long copper nanorod arrays with an average nanorod diameter of ∼150 nm. The nanorod arrays are integrated to copper thin film (∼300 nm thick) coated on silicon wafer surface and GLAD (Glancing Angle Deposition) technique was implemented to form the nanostructure configuration. The dimensions and flow rates were chosen to ensure that no change in the nanostructure configurations occurred during the experiments so that the configuration could be used for many experiments. For this, applied heat fluxes (<42 W/cm2) were adjusted in such a way that the wall superheats did not exceed 30°C to avoid any damage on nanostructures. Deionized-water was propelled with a gear pump into the rectangular channel over plates with both plain and nanostructured surface, which were heated with cartridge heaters. Forced convective boiling heat transfer characteristics of the nanostructured plate is investigated using the experimental setup and compared to the results from the plate with plain surface. A significant increase in boiling heat transfer was observed with the nanostructured plate. In the light of the obtained promising results, channels with nanostructured surfaces were proven to be useful particularly in various applications such as cooling of small electronic devices, where conventional surface enhancement techniques are not applicable.
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Radha Shanmugam, Nandhinee, Sriram Muthukumar, and Shalini Prasad. "Zinc Oxide Nanostructures as Electrochemical Biosensors on Flexible Substrates." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-9085.

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A novel flexible electrochemical biosensor for protein biomarker detection was successfully designed and fabricated on a nanoporous polyimide membrane using zinc oxide (ZnO). Nanostructures of ZnO were grown on microelectrode platform using aqueous solution bath. Electrochemical measurements were performed using gold, ZnO seed and nanostructured electrodes to study the influence of electrode surface area on biosensing performance. Feasibility analysis of sensor platforms was evaluated using high concentrations (in ng/mL) of troponin-T. The results showed that improved performance can be obtained on nanostructured platform by careful optimization of growth conditions. This study demonstrates the development of nanostructured ZnO flexible biosensors towards ultra-sensitive protein biosensing.
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Reports on the topic "Nanostructures"

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Author, Not Given. Transparent Conductive Nanostructures. Office of Scientific and Technical Information (OSTI), June 2008. http://dx.doi.org/10.2172/940242.

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Barsic, Anthony, Rafael Piestun, and Robert R. Boye. Metrology of 3D nanostructures. Office of Scientific and Technical Information (OSTI), October 2012. http://dx.doi.org/10.2172/1144015.

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Aubry, Sylvie, Thomas Aquinas Friedmann, John Patrick Sullivan, Diane Elaine Peebles, David H. Hurley, Subhash L. Shinde, Edward Stanley Piekos, and John Allen Emerson. Phonon engineering for nanostructures. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/984139.

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Smirl, Arthur L. Resonant Photonic Bandgap Nanostructures. Fort Belvoir, VA: Defense Technical Information Center, May 2006. http://dx.doi.org/10.21236/ada455528.

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Zewail, Ahmed H. Imaging Surfaces and Nanostructures. Fort Belvoir, VA: Defense Technical Information Center, February 2011. http://dx.doi.org/10.21236/ada564109.

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Sandhage, Kenneth H. Reactive Conversion of Bioclastic Nanostructures. Fort Belvoir, VA: Defense Technical Information Center, July 2005. http://dx.doi.org/10.21236/ada437259.

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Pan, Wei, Jon F. Ihlefed, Ping Lu, and Stephen R. Lee. Emergent Phenomena in Oxide Nanostructures. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1489862.

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Zhigang Suo. Configurational forces in solid nanostructures. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/883314.

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Pechan, Michael. Magnetic Nanostructures and Spintronic Materials. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1236143.

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Galli, Guilia. Semiconductor Nanostructures By Scientific Design. Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1169952.

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