Готові списки джерел за темами / Nanostructures - Surfaces

Добірка наукової літератури з теми "Nanostructures - Surfaces"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Nanostructures - Surfaces"

1

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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2

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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3

Hariharalakshmanan, Ranjitha K., Fumiya Watanabe, and Tansel Karabacak. "In Situ Growth and UV Photocatalytic Effect of ZnO Nanostructures on a Zn Plate Immersed in Methylene Blue." Catalysts 12, no. 12 (December 16, 2022): 1657. http://dx.doi.org/10.3390/catal12121657.

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Nanostructures of zinc oxide (ZnO) are considered promising photocatalysts for the degradation of organic pollutants in water. This work discusses an in situ growth and UV photocatalytic effect of ZnO nanostructures on a Zn plate immersed in methylene blue (MB) at room temperature. First, the Zn surfaces were pretreated via sandblasting to introduce a micro-scale roughness. Then, the Zn plates were immersed in MB and exposed to UV light, to observe ZnO nanostructure growth and photocatalytic degradation of MB. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy were used to characterize the Zn surfaces. We observed the growth of stoichiometric and crystalline ZnO with a nano-leaf morphology and an estimated bandgap of 3.08 eV. The photocatalytic degradation of MB was also observed in the presence of the ZnO nanostructures and UV light. The average percentage degradation was 76% in 4 h, and the degradation rate constant was 0.3535 h−1. The experimental results suggest that room temperature growth of ZnO nanostructures (on Zn surfaces) in organic dye solutions is possible. Furthermore, the nanostructured surface can be used simultaneously for the photocatalytic degradation of the organic dye.
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4

Wang, Yuliang, Xiaolai Li, Shuai Ren, Hadush Tedros Alem, Lijun Yang, and Detlef Lohse. "Entrapment of interfacial nanobubbles on nano-structured surfaces." Soft Matter 13, no. 32 (2017): 5381–88. http://dx.doi.org/10.1039/c7sm01205e.

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The nucleation mechanism of interfacial nanobubbles is revealed on immersed nanostructured hydrophobic surfaces. The result shows that surface nanostructures play a key role in controlling nanobubbles' size, position, and even morphology.
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5

Mansurov, Z. A., M. Nazhipkyzy, B. T. Lesbayev, N. G. Prikhodko, M. Auyelkhankyzy, and I. K. Puri. "Synthesis of Superhydrophobic Carbon Surface during Combustion Propane." Eurasian Chemico-Technological Journal 14, no. 1 (December 15, 2011): 19. http://dx.doi.org/10.18321/ectj94.

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We synthesize and deposit carbon nanostructures through flame synthesis on silicon and nickel wafers at different nonpremixed flame locations to produce hydrophobic surfaces. The hydrophobicity is characterized through the contact angle for water droplets placed on the surface. The surface morphology of the nanoparticles is obtained from SEM images. The morphology and hydrohobicity of the nanostructured surfaces depends upon the deposition, which differs at various flame locations. We determine the optimum flame location for the synthesis and deposition of surface carbon nanostructures that lead to maximum hydrophobicity.
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6

Spiecker, Erdmann, Stefan Hollensteiner, Wolfgang Jäger, Hans Haselier, and Herbert Schroeder. "Self-Assembled Nanostructures on VSe2Surfaces Induced by Cu Deposition." Microscopy and Microanalysis 11, no. 5 (September 28, 2005): 456–71. http://dx.doi.org/10.1017/s1431927605050373.

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Analytical transmission electron microscopy (TEM) and scanning electron microscopy (SEM) have been applied for the characterization of evolution, lateral arrangements, orientations, and the microscopic nature of nanostructures formed during the early stages of ultrahigh vacuum electron beam evaporation of Cu onto surfaces of VSe2layered crystals. Linear nanostructure of relatively large lateral dimension (100–500 nm) and networks of smaller nanostructures (lateral dimension: 15–30 nm; mesh sizes: 500–2000 nm) are subsequently formed on the substrate surfaces. Both types of nanostructures are not Cu nanowires but are composed of two strands of crystalline substrate material elevating above the substrate surface. For the large nanostructures a symmetric roof structure with an inclination angle of ∼30° with respect to the substrate surface could be deduced from detailed diffraction contrast experiments. In addition to the nanostructure networks a thin layer of a Cu-VSe2intercalation phase of 3R polytype is observed at the substrate surface. A dense network of interface dislocations indicates that the phase formation is accompanied by in-plane strain. We present a model that explains the formation of large and small nanostructures as consequences of compressive layer strains that are relaxed by the formation of rooflike nanostructures, finally evolving into the observed networks with increasing deposition time. The dominating contributions to the compressive layer strains are considered to be an electronic charge transfer from the Cu adsorbate to the substrate and the formation of a Cu-VSe2intercalation compound in a thin surface layer.
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Li, Xin, Yiming Guo, and Hai Cao. "Nanostructured surfaces from ligand-protected metal nanoparticles." Dalton Transactions 49, no. 41 (2020): 14314–19. http://dx.doi.org/10.1039/d0dt02822c.

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8

Ranjan, A., N. Pothayee, M. N. Seleem, N. Sriranganathan, R. Kasimanickam, M. Makris, and J. S. Riffle. "In Vitro Trafficking and Efficacy of Core-Shell Nanostructures for Treating Intracellular Salmonella Infections." Antimicrobial Agents and Chemotherapy 53, no. 9 (July 13, 2009): 3985–88. http://dx.doi.org/10.1128/aac.00009-09.

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ABSTRACT Nanostructures encapsulating gentamicin and having either amphiphilic (N1) or hydrophilic (N2) surfaces were designed. Flow cytometry and confocal microscopy studies demonstrated a higher rate of uptake for amphiphilic surfaces. A majority of N1 were localized in the cytoplasm, whereas N2 colocalized with the endosomes/lysosomes. Colocalization was not observed between nanostructures and intracellular Salmonella bacteria. However, significant in vitro reductions in bacterial counts (0.44 log10) were observed after incubation with N1, suggesting that the surface property of the nanostructure influences intracellular bacterial clearance.
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Mills, Christopher A., Elena Martinez, Abdelhamid Errachid, Elisabeth Engel, Miriam Funes, Christian Moormann, Thorsten Wahlbrink, Gabriel Gomila, Josep Planell, and Josep Samitier. "Nanoembossed Polymer Substrates for Biomedical Surface Interaction Studies." Journal of Nanoscience and Nanotechnology 7, no. 12 (December 1, 2007): 4588–94. http://dx.doi.org/10.1166/jnn.2007.18110.

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Biomedical devices are moving towards the incorporation of nanostructures to investigate the interactions of biological species with such topological surfaces found in nature. Good optical transparency and sealing properties, low fabrication cost, fast design realization times, and bio-compatibility make polymers excellent candidates for the production of surfaces containing such nanometric structures. In this work, a method for the production of nanostructures in free-standing sheets of different thermoplastic polymers is presented, with a view to using these substrates in biomedical cell-surface applications where optical microscopy techniques are required. The process conditions for the production of these structures in poly(methyl methacrylate), poly(ethylene naphthalate), poly(lactic acid), poly(styrene), and poly(ethyl ether ketone) are given. The fabrication method used is based on a modified nanoimprint lithography (NIL) technique using silicon based moulds, fabricated via reactive ion etching or focused ion beam lithography, to emboss nanostructures into the surface of the biologically compatible thermoplastic polymers. The method presented here is designed to faithfully replicate the nanostructures in the mould while maximising the mould lifetime. Examples of polymer replicas with nanostructures of different topographies are presented in poly(methyl methacrylate), including nanostructures for use in cell-surface interactions and nanostructure-containing microfluidic devices.
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10

Chen, Cheng-Ying, Ming-Wei Chen, Jr-Jian Ke, Chin-An Lin, José R. D. Retamal, and Jr-Hau He. "Surface effects on optical and electrical properties of ZnO nanostructures." Pure and Applied Chemistry 82, no. 11 (August 6, 2010): 2055–73. http://dx.doi.org/10.1351/pac-con-09-12-05.

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This article presents a comprehensive review of the current research addressing the surface effects on physical properties and potential applications of nanostructured ZnO. Studies illustrating the transport, photoluminescence (PL), and photoconductivity properties of ZnO with ultrahigh surface-to-volume (S/V) ratio are reviewed first. Secondly, we examine recent studies of the applications of nanostructured ZnO employing the surface effect on gas/chemical sensing, relying on a change of conductivity via electron trapping and detrapping process at the surfaces of nanostructures. Finally, we comprehensively review the photovoltaic (PV) application of ZnO nanostructures. The ultrahigh S/V ratios of nanostructured devices suggest that studies on the synthesis and PV properties of various nanostructured ZnO for dye-sensitized solar cells (DSSCs) offer great potential for high efficiency and low-cost solar cell solutions. After surveying the current literature on the surface effects on nano-structured ZnO, we conclude this review with personal perspectives on a few surface-related issues that remain to be addressed before nanostructured ZnO devices can reach their ultimate potential as a new class of industrial applications.
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Більше джерел

Дисертації з теми "Nanostructures - Surfaces"

1

Jackson, Richard James. "Engineering nanostructures for biological sensor surfaces." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430773.

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2

Nemitz, Ian R. "Liquid Crystals: Surfaces, Nanostructures, and Chirality." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1480686661255562.

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3

Nemitz, Ian Robert. "Cristaux liquides : surfaces, nanostructures et chiralité." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066586/document.

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Cette thèse se concentre sur les cristaux liquides (CLs), leurs propriétés chirales et leurs interactions avec des surfaces et des nanostructures. Des cellules nématiques torsadées ont été remplies d'un CL dopé avec la molécule chirale CB15, qui compense la torsion imposée. Les résultats indiquent qu'un effet électroclinique (ECE) existe près de la surface en présence de molécules déracémisables conformes. Des mesures ECE ont aussi été réalisées afin de déterminer la réponse en ECE dans un CL dopé avec des organosilicates mésoporeux périodiques (OMP) chiraux. Les données montrent que la source principale du signal émane de l'extérieur des OMP plutôt que de leurs c¿urs. Un ECE est mesuré pour des CLs chiraux au-delà de leur température de transition de phase nématique/isotrope de bulk, et est observable dans les couches paranématiques induites par les substrats causant un alignement planaire. Nous avons dopé des stries huileuses de smectique A avec du CB15. Lors de ce dopage chiral, l'orientation des stries tourne d'un angle dépendant de la température, augmentant avec la concentration et maximum juste en-dessous de la température de transition smectique A/nématique. Ceci est expliqué comme une manifestation de l'ECE de surface sous la structure de strie huileuse permettant une rotation de cette dernière. Enfin, une structure innovante dans un système hybride aligné a été observée en-dessous de la température de transition Smectique A/Smectique C. Cette structure correspond à des stries périodiques sombres et claires perpendiculaires aux stries huileuses, éliminant les traces optiques des stries huileuses. Une origine possible de ces stries est présentée
This dissertation focuses on liquid crystals (LCs), specifically their chiral properties and interactions with surfaces and nanostructures. Nematic twist cells were filled with a LC doped with the chiral molecule CB15, which compensates for the imposed twist. Using the electroclinic effect (ECE), results indicate that an ECE always exists near the surface in twist cells containing conformationally deracemizable molecules. ECE measurements were also performed to determine the source of the ECE response in a LC doped with chiral periodic mesoporous organosilica (PMO). The data show that the main source of the signal emanates from outside the PMO, and not inside the PMO pores. An ECE also is reported for chiral LCs above their bulk chiral isotropic–nematic phase transition, and is observable in the paranematic layers induced by the planar-aligning substrates. Optical microscopy measurements were performed on smectic-A oily streaks doped with CB15. When chirally doped, the stripe orientation rotated by a temperature dependent angle: This angle increased with concentration, was largest just below the nematic – smectic-A transition, and stabilized to near zero within ~1C below TNA. This is explained as a manifestation of a surface ECE. Finally, a novel structure in a hybrid aligned system was observed below the Smectic-A – Smectic-C transition. The structure appeared as periodic dark and light streaks running perpendicular to the oily streaks, and formed by extending discretely from one oily streak to the next, eliminating optical evidence of the oily streaks. At lower temperatures the streaks undulated in a 2D chiral pattern. A possible origin of these streaks is presented
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4

Nolan, John William. "Contacting and imaging nanostructures on silicon surfaces." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275970.

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5

Bergman, Kathryn N. "Biomineralization of inorganic nanostructures using protein surfaces." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22674.

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Thesis (M. S.)--Materials Science and Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Tsukruk, Vladimir; Committee Member: Kalaitzidou, Kyriaki; Committee Member: Valeria Milam.
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6

Ramasubramaniam, Ashwin. "Dynamics and stability of nanostructures on crystal surfaces /." View online version; access limited to Brown University users, 2005. http://wwwlib.umi.com/dissertations/fullcit/3174661.

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7

Wieland, Maria B. "Formation and deposition of polymer nanostructures on surfaces." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/30689/.

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In this thesis different routes to the formation of extended two-dimensional polymers via on-surface coupling reactions are presented. Polyphenylene networks formed by the molecules tri-(bromo-phenyl)-benzene via on-surface Ullmann coupling reactions are investigated with scanning tunnelling microscopy. The polyphenylene networks with near complete surface coverage exhibit a vitreous structure. The network is composed of linked molecules forming polygons with four to eight edges. A different set of covalently bound molecular nanostructures can be formed on a surface upon thermal activation of porphyrin building blocks. Porphyrin molecules are covalently linked to form one dimensional chains or extended networks using either Ullmann-type coupling reactions to link brominated phenyl sidegroups, or Glaser-Hay-type coupling to form butadiene links via reaction of two phenyl-ethylene sidegroups. The resulting polymers are investigated with scanning tunnelling microscopy and Raman spectroscopy. In a complementary strand of research it is shown that thin films of C60 can promote adhesion between a gold thin film deposited on mica and a solution-deposited layer of the elastomer polymethyldisolaxane (PDMS). This molecular adhesion facilitates the removal of the gold film from the mica support by peeling and provides a new approach to template stripping which avoids the use of conventional adhesive layers. The fullerene adhesion layers may also be used to remove organic monolayers and thin films as well as two-dimensional polymers such as the porphyrin networks discussed previously. Following the removal from the mica support the monolayers may be isolated and transferred to a dielectric surface by etching of the gold thin film, mechanical transfer and removal of the fullerene layer by annealing/dissolution. The use of this molecular adhesive layer provides a new route to transfer polymeric films from metal substrates to other surfaces. A different set of experiments investigated porphyrin nanorings and their interaction with C60 on a gold surface. Solvent-induced aggregates of nanoring cyclic polymers may be transferred by electrospray deposition to a surface where they adsorb as three dimensional columnar stacks. The observed stack height varies from single rings to three stacked rings. Those stacked layers of cyclic porphyrin nanorings constitute nanoscale receptacles with variable height and diameter which preferentially adsorb sublimed C60 molecules. Using scanning tunnelling microscopy the filling capacity of these nanoring traps is determined, as is the dependence of adsorbate capture on stack height and diameter.
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8

Hamid, Firas Abdel. "Surfaces d’alliages métalliques complexes : nanostructures et croissance moléculaire." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0155.

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Les alliages métalliques complexes (CMAs) sont des intermétalliques dont la maille élémentaire est caractérisée par un grand nombre d’atomes ainsi qu’une sous-structure en agrégats de haute symétrie. Les quasicristaux et leurs approximants périodiques font partie de cette classe de matériaux. Ici, nous avons étudié la structure atomique et électronique de la surface (100) d’un composé cage Ce3Pd20Si6 qui peut être également considéré comme un CMA. Sa structure est décrite par un assemblage de cages - Pd12Si6 et Pd16 – enfermant les atomes de Ce. La surface est analysée en utilisant des méthodes expérimentales d’analyse sous ultravide comme la photoémission, la diffraction d’électrons et la microscopie à effet tunnel (STM), ainsi que des méthodes de simulations atomistiques basées sur la théorie de la fonctionnelle de la densité (DFT). On trouve que la surface se forme par troncature du volume en des plans spécifiques qui conservent le sous-réseau de cage de type Pd12Si6, avec des atomes de Pd supplémentaires qui rendent la surface plus compacte. L’analyse de la fonction de localisation électronique et des volumes et charges de Bader montrent que, bien que le système soit clairement métallique, la structure de la surface est influencée par les interactions entre les atomes de Pd et Si formant les cages Pd12Si6. Du fait de la préservation de ces cages, la surface présente une nanostructuration intrinsèque, de périodicité légèrement inférieure au nanomètre. Cette surface est ensuite utilisée comme patron pour essayer de former des films moléculaires auto-organisés. Des premiers résultats sont présentés concernant l’auto-assemblage de C60 et de son dérivé (PTBC) sur différents substrats, Ce3Pd20Si6(100) mais aussi les surfaces d’ordre 5 des phases icosaédriques i-AlCuFe et i-AgInYb ainsi que les surfaces hexagonales simples Cu(111) et Au(111). Des modèles simples sont proposés pour décrire les structures formées par les PTBC sur Cu(111) et Au(111). Les dépôts de C60 sur la surface Ce3Pd20Si6(100) conduit à la formation de deux domaines rotationnels de structure hexagonale très faiblement organisés, alors que PTBC donne des films amorphes. Pour PTBC déposées sur les surfaces quasicristallines, on trouve dans les deux cas que les molécules sont orientées selon les axes de symétrie du substrat à bas taux de couverture. L’accord de symétrie molécules/substrat est essentiel. Lorsque la monocouche est saturée, le film est soit amorphe sur i-AlCuFe soit quasipériodique sur i-AgInYb mais avec beaucoup de désordre
Complex metallic alloys (CMAs) are intermetallics with a unit cell characterized by a large number of atoms and a substructure of atomic clusters of high symmetry. Quasicrystals and their periodic approximants are part of this class of materials. Here, we have investigated the atomic and electronic structure of the (100) surface of a cage compound Ce3Pd20Si6 which can be also considered as a CMA. The assembly of Pd12Si6 and Pd16 cages in which guest Ce atoms are located describes its structure. The surface is analyzed using experimental methods under ultrahigh vacuum as well as atomistic simulations based on density functional theory (DFT). The surface forms at corrugated planes of the bulk structure that preserve intact the Pd12Si6 cages, with additional Pd surface atoms. It is concluded that despite this Pd-based cage compound being clearly metallic, stronger interactions between Pd and Si atoms on the host cage structure significantly influence its surface structure. Due to the cage preservation, the surface presents an intrinsic nanostructuration with a periodicity slightly less than one nanometer. This surface is further used as a pattern in an attempt to form self-organized molecular films. First results are presented concerning the self-assembly of C60 and its derivative (PTBC) on different substrates, including Ce3Pd20Si6(100) but also 5-fold surfaces of icosahedral phases i-AlCuFe and i-AgInYb and simple Cu (111) and Au (111) surfaces. Simple models are proposed to describe the structures formed by PTBC on Cu (111) and Au (111). C60 deposited on Ce3Pd20Si6(100) leads to the formation of hexagonal nanodomains,while PTBC leads to amorphous films. For PTBC deposited on quasicrystalline surfaces, preferential adsorption occurs at low coverage at 5-fold symmetric sites, dictated by symmetry matching between molecules and substrates. When the monolayer is saturated however, the film is either amorphous on i-AlCuFe or quasiperiodic on i-AgInYb, but with a large amount of disorder
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9

Rohart, Stanislas. "Croissance et magnétisme de nanostructures organisées sur surfaces cristallines." Phd thesis, Université Paris-Diderot - Paris VII, 2005. http://tel.archives-ouvertes.fr/tel-00010738.

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Dans ce travail de thèse, nous nous intéressons à l'élaboration de réseaux de nanoplots magnétiques, afin d'en étudier les propriétés magnétiques. Les nanoplots sont élaborés sur Au(788), une surface spontanément pré-structurée et qui permet la croissance de réseaux avec un ordre à grande distance et une distribution de taille étroite. La première partie de ce travail consiste à étudier les mécanismes qui conduisent à la croissance organisée sur un réseau de pièges ponctuels. Nous établissons le lien entre la plage de température qui permet d'observer la croissance organisée et les paramètres énergétiques du problème. Ensuite, grâce à des études exhaustives de la croissance en fonction de la température de substrat, réalisées à l'aide d'un Microscope à Effet Tunnel à température variable, nous étudions la croissance du cobalt et du fer sur Au(788). La comparaison avec des simulations multi-échelles (Dynamique Moléculaire, Monte Carlo cinétique) nous permet alors de déterminer les mécanismes atomiques à l'origine de l'organisation. La deuxième partie de ce travail est consacrée à l'étude du magnétisme des nanostructures que nous savons former, et plus particulièrement à la détermination du lien entre la morphologie des plots et leur énergie d'anisotropie magnétique (MAE). Après une étude sur les limites du modèle du macromoment et du retournement cohérent de l'aimantation habituellement utilisé pour les nanostructures, nous nous intéressons aux propriétés magnétiques de nanoplots contenant une centaine d'atomes de cobalt. Grâce à la mesure de cycles d'hystérésis à différentes températures, nous déduisons la distribution de MAE dans l'échantillon. Celle-ci est large, contrairement à des résultats précédents sur des îlots plus gros. La comparaison avec la distribution de taille des îlots implique une relation non triviale entre la taille des îlots et leur MAE.
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10

Basagni, Andrea. "Covalent stabilization of 2D self-assembled nanostructures on surfaces." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424495.

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The rise of graphene has attracted great interest in low-dimensional materials (0D, 1D and 2D). A joint effort among the different branches of science (chemistry, physics, materials science and related areas) is directed towards the production of new intriguing materials with tuneable graphene-like properties. Promising is the direct synthesis of organic nanostructures on metal surfaces under ultrahigh-vacuum conditions (UHV). Perfect tuning of the reaction conditions, high control of the surface symmetry and of its corrugation, a rich variety of substrate materials are only some of the advantage that UHV may offer. Although several reactions have been tested, it seems clear that to achieve ordered covalent monolayers more complex approaches are needed. In this thesis, the on-surface polymerization of covalent nanostructures has been studied for different coupling reactions, substrate materials and reaction conditions. Scanning tunneling microscopy and X-ray photoelectron spectroscopy are used for the characterization, allowing complementary analysis of molecular structures and chemical states. In particular, thermally activated reactions were used to gradually polymerize the 4,4”-dibromo-terphenyl precursor into poly-paraphenylene wires, through an Ullmann-like reaction scheme on Au(111), and then into graphene nanoribbons, after activation of the C-H bonds. A fine balance between the catalytic activity of the surface, molecular mobility and favourable molecular organization allowed us to get extended and ordered covalent structures. Taking advantage of this synthetic pathway, three different mono-dimensional polymers were obtained, namely poly-paraphenylene and two pyridinic derivatives, with gradually increased nitrogen content. Macroscopically anisotropic samples have been prepared by taking advantage of the vicinal surface templating effect. Using angle resolved photoemission spectroscopy, we reveal that the electronic structure of doped polymers is monotonically downshifted with respect to the metal Fermi level as the pyridine substitution is increased within the molecular scaffold. Finally, the photochemical activation of different functional groups has been explored. These studies represents a step forward in the application of organic photochemistry to on-surface synthesis, which is currently limited to the use of diacetylene groups, and it opens up new opportunities for using several organic functional groups as photoactive centres for the synthesis of covalent organic frameworks.
La scoperta del grafene ha suscitato grande interesse verso i materiali a bassa dimensionalità (0D, 1D e 2D) e uno sforzo congiunto tra i diversi rami della scienza è orientato verso la produzione di nuovi materiali con proprietà analoghe a quelle del grafene, ma controllabili. La sintesi su superficie in condizioni di ultra-alto vuoto (UHV) sembra essere promettente per la produzione di nanostrutture organiche. Infatti, in queste condizioni, è possibile avere un’ampia varietà di materiali, un perfetto controllo delle condizioni di reazione, della simmetria della superficie e della sua corrugazione. Questi sono solo alcuni dei vantaggi che l’UHV offre. Sebbene varie reazioni siano state testate negli ultimi anni, sembra chiaro che per realizzare monostrati polimerici ordinati siano necessiari approcci più complessi. In questo lavoro di Tesi, la sintesi di nanostrutture polimeriche su superficie è stata studiata per diverse reazioni, substrati e condizioni di reazione. La microscopia ad effetto tunnel e la spettroscopia di fotoemissione a raggi X sono state utilizzate per la caratterizzazione dei diversi sistemi permettendo un'analisi complementare delle strutture molecolari e dei loro stati chimici. In particolare, le reazioni attivate termicamente sono state utilizzate per polimerizzare gradualmente il 4,4"-dibromo-terfenile e ottenere, in un primo step di reazione, per mezzo della reazione di Ullmann su Au (111), il poli-parafenilene, ,e poi nanoribbons di grafene dopo l'attivazione del legami C-H. Un delicato equilibrio tra l'attività catalitica della superficie, la mobilità molecolare e l’organizzazione molecolare ha permesso di ottenere strutture ordinate estese. Inoltre, sfruttando questa metodica, sono stati ottenuti tre differenti polimeri 1D, caratterizzati da un crescente contenuto di azoto. Campioni macroscopicamente anisotropici sono stati preparati sfruttando l'effetto templante delle superfici vicinali e, grazie alla spettroscopia di fotoemizzione risolta in angolo, è stato rivelato che la struttura elettronica dei polimeri drogati è rigidamente spostata verso energie minori rispetto al livello di Fermi del metallo all'aumentare del contenuto di azoto. Infine, è stata esplorata l'attivazione fotochimica di diversi gruppi funzionali. Questi studi rappresentano un passo avanti verso l’applicazione della fotochimica alla sintesi su superficie, che attualmente sfrutta solo gruppi diacetilenici, e apre nuove opportunità per l'utilizzo di diversi gruppi funzionali organici come centri fotoattivi.
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Книги з теми "Nanostructures - Surfaces"

1

Vancso, G. Julius, ed. Ordered Polymeric Nanostructures at Surfaces. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11605294.

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Shchukin, Vitaly A. Epitaxy of Nanostructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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3

H, Fendler Janos, Dékány Imre, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Research Workshop on Nanoparticles in Solids and Solutions--an Integrated Approach to Their Preparation and Characterization (1996 : Szeged, Hungary), eds. Nanoparticles in solids and solutions. Dordrecht: Kluwer Academic Publishers, 1996.

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Dieter, Bimberg, ed. Semiconductor nanostructures. Berlin: Springer, 2008.

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Nanostructured thin films and surfaces. Weinheim: Wiley-VCH, 2010.

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6

Ciobanu, Cristian V., Cai-Zhuang Wang, and Kai-Ming Ho. Atomic Structure Prediction of Nanostructures, Clusters and Surfaces. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527655021.

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7

1964-, Berakdar J., and Kirschner Jürgen, eds. Correlation spectroscopy of surfaces, thin films, and nanostructures. Weinheim: Wiley-VCH, 2004.

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8

Kalt, Heinz. Optics of Semiconductors and Their Nanostructures. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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9

Topical Meeting Microphysics of Surfaces: Nanoscale Processing (1995 Santa Fe, N.M.). Microphysics of surfaces: Nanoscale processing : summaries of the papers presented at the topical meeting Microphysics of Surfaces: Nanoscale Processing, February 9-11, 1995, Santa Fe, New Mexico. Washington, DC: Optical Society of America, 1995.

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10

1943-, Schwarz James A., and Contescu Cristian I. 1948-, eds. Surfaces of nanoparticles and porous materials. New York: Marcel Dekker, 1999.

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Частини книг з теми "Nanostructures - Surfaces"

1

Jiang, Hong. "Theoretical Models for Bimetallic Surfaces and Nanoalloys." In Bimetallic Nanostructures, 23–60. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119214618.ch2.

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2

Sydorenko, Alexander. "Nanostructures in Thin Films from Nanostructured Polymeric Templates: Self-Assembly." In Polymer Surfaces and Interfaces, 261–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-73865-7_13.

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Järrendahl, Kenneth, and Hans Arwin. "Polarizing Natural Nanostructures." In Ellipsometry of Functional Organic Surfaces and Films, 155–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40128-2_8.

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Järrendahl, Kenneth, and Hans Arwin. "Polarizing Natural Nanostructures." In Ellipsometry of Functional Organic Surfaces and Films, 247–68. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75895-4_11.

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Sauvage-Simkin, M. "4.2.3 Semiconductor surfaces, interfaces, and nanostructures." In Physics of Solid Surfaces, 123–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47736-6_46.

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Hossain, Md Zakir, and Maki Kawai. "Formation of Organic Nanostructures on Semiconductor Surfaces." In Functionalization of Semiconductor Surfaces, 277–300. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118199770.ch10.

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de Jeu, Wim H., Yaëlle Séréro, and Mahmoud Al-Hussein. "Liquid Crystallinity in Block Copolymer Films for Controlling Polymeric Nanopatterns." In Ordered Polymeric Nanostructures at Surfaces, 71–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/12_006.

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Albrecht, Krystyna, Ahmed Mourran, and Martin Moeller. "Surface Micelles and Surface-Induced Nanopatterns Formed by Block Copolymers." In Ordered Polymeric Nanostructures at Surfaces, 57–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/12_007.

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9

Schönherr, Holger, Geerten H. Degenhart, Barbara Dordi, Chuan Liang Feng, Dorota I. Rozkiewicz, Alexander Shovsky, and G. Julius Vancso. "Organic and Macromolecular Films and Assemblies as (Bio)reactive Platforms: From Model Studies on Structure–Reactivity Relationships to Submicrometer Patterning." In Ordered Polymeric Nanostructures at Surfaces, 169–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/12_014.

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Sommer, Jens-Uwe, and Günter Reiter. "The Formation of Ordered Polymer Structures at Interfaces: A Few Intriguing Aspects." In Ordered Polymeric Nanostructures at Surfaces, 1–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/12_015.

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Тези доповідей конференцій з теми "Nanostructures - Surfaces"

1

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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Chen, Min, Bing-Yang Cao, and Zeng-Yuan Guo. "Micro/Nano-Scale Fluid Flows on Structured Surfaces." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62023.

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Understanding the effects of surface nanostructures on fluid flow in micro- and nano-channels is highly desirable for micro/nano-electro-mechanical systems. By way of equilibrium and non-equilibrium molecular dynamics simulations, wetting on nano-structured surfaces and liquid flow in nano-channels with structured surfaces are simulated. The surfaces show dual effects on the boundary slip and friction of the liquid flow in nano-channels. Generally, the nanostructures enhance the surface hydrophilicity for a hydrophilic liquid-solid interaction, and increase the hydrophobicity for a hydrophobic interaction. Simultaneously, the nanostructures distort the nanoscale streamlines of the liquid flow near the channel surface and block the flow, which decreases the apparent slip length. The twofold effects of the nanostructures on the surface wettability and the hydrodynamic disturbance result in a non-monotonic dependence of the slip length on the structure’s size. However, the surface structure may lead to a very high contact angle of about 170° in some cases, which cause the surface show super-hydrophobicity and lead to a remarkable velocity slip. The surface nanostructures can thus be applied to control the friction of micro- and nano-flows. In addition, the gaseous flows in micro- and nano-channels with structured surfaces are simulated. The geometry of the surface is modeled by triangular, rectangular, sinusoidal and randomly triangular nanostructures respectively. The results show that the velocity slips, including negative slip, depend not only on the Knudsen number but also the surface structure. The impacts of the surface nanostructure and the gas rarefaction are strongly coupled. In general, the slip length of a gaseous flow over a structured surface is less than what predicted by the Maxwell model, and depends not only on the Knudsen number but also the size of the surface nanostructures.
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3

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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4

Enright, Ryan, Nicholas Dou, Nenad Miljkovic, Youngsuk Nam, and Evelyn N. Wang. "Condensation on Superhydrophobic Copper Oxide Nanostructures." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75277.

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Condensation is an important process in both emerging and traditional power generation and water desalination technologies. Superhydrophobic nanostructures promise enhanced condensation heat transfer by reducing the characteristic size of departing droplets via a surface-tension-driven mechanism [1]. In this work, we investigated a scalable synthesis technique to produce oxide nanostructures on copper surfaces capable of sustaining superhydrophobic condensation and characterized the growth and departure behavior of condensed droplets. Nanostructured copper oxide (CuO) films were formed via chemical oxidation in an alkaline solution. A dense array of sharp CuO nanostructures with characteristic heights and widths of ∼1 μm and ∼300 nm, respectively, were formed. A gold film was deposited on the surface and functionalized with a self-assembled monolayer to make the surfaces hydrophobic. Condensation on these surfaces was then characterized using optical microscopy (OM) and environmental scanning electron microscopy (ESEM) to quantify the distribution of nucleation sites and elucidate the growth behavior of individual droplets with a characteristic size of ∼1 to 10 μm at low supersaturations. Comparison of the observed behavior to a recently developed model for condensation on superhydrophobic surfaces [2, 3] suggests a restricted regime of heat transfer enhancement compared to a corresponding smooth hydrophobic surface due to the large apparent contact angles demonstrated by the CuO surface.
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5

King, S. M., Md M. Rahman, A. K. Krick, L. D. Branco, E. Olceroglu, and M. McCarthy. "Biotemplated Nanostructured Surfaces for Enhanced Phase Change Heat Transfer." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73190.

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The fabrication and characterization of biotemplated nanostructured coatings based on the Tobacco mosaic virus for enhanced phase-change heat transfer is reported. A simple room temperature nanofabrication process, using the self-assembly and mineralization of the Tobacco mosaic virus (TMV), has been implemented to create superhydrophilic surfaces. Using this technique, a variety of structured surfaces have been fabricated and characterized showing enhanced surface wettability and heat transfer characteristics. High-speed images of droplet impact evaporation on flat and hierarchical samples have been recorded, showing increased wetting and evaporation for the nanostructured surfaces. The addition of nanostructures increases the heat transfer rate by more than a factor of three as compared to the flat surfaces, and hierarchical surfaces exhibit heat transfer rates more than an order of magnitude larger than flat non-structured surfaces. Additionally, an increase in Leidenfrost temperature of 100°C as compared to flat samples has been recorded. TMV nanostructures were also assembled onto the walls of heated minichannels, promoting continuous bubble detachment as well as reduced slug formation and instabilities during flow boiling. While bare minichannel exhibits nearly complete dry-out, the nanostructured channels maintain annular flow at similar loadings. This work demonstrates the feasibility of enhancing phase-change heat transfer using TMV structured coatings.
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Su, Junwei, Hamed Esmaeilzadeh, Chefu Su, Majid Charmchi, Marina Ruths, and Hongwei Sun. "Characterization of Jumping-Droplet Condensation on Nanostructured Surfaces With Quartz Crystal Microbalance." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72315.

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The spontaneously jumping motion of condensed droplets by coalescence on superhydrophobic surfaces has been an active area of research due to its great potential for enhancing the condensation efficiency. Despite a considerable amount of microscopic observations, the interfacial wetting characterization during jumping-droplet condensation is still notably lacking. This work focuses on applying a novel acoustic sensor - quartz crystal microbalance (QCM), to characterize the interfacial wetting on nanostructured surfaces during jumping-droplet condensation. Copper oxide nanostructures were generated on the surface of QCM with a chemical etching method. Based on the geometry of the nanostructures, we modified a theoretical model to reveal the relationship between the frequency shift of the QCM and the wetting states of the surfaces. It was found that the QCM is extremely sensitive to the penetrated liquid in the structured surfaces. Then, the QCM with nanostructured surface was tested on a customed flow condensation setup. The dynamic interfacial wetting characteristics were quantified by the normalized frequency shift of the QCM. Combined with microscopic observation of the corresponding drop motion, we demonstrated that partial wetting (PW) droplets with an about 25% penetrated area underwent spontaneously jumping by coalescence. However, the PW droplets no longer jumped when the penetrated area exceeds 50% due to the stronger adhesion between liquid and the surface. It shows that the characterization of the penetrated liquid in micro/nanostructures, which is very challenging for microscopic observation, can be easily carried out by this acoustic technique.
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Nolan, Eric, Russell Rioux, and Calvin Hong Li. "Experimental Study of Critical Heat Flux and Heat Transfer Coefficient Enhancements in Pool Boiling Heat Transfer With Nanostructure Modified Active Nucleation Site and Contact Angle." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89903.

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An experimental study of nanostructure modified nucleation site density and contact angle that significantly enhances the Heat Transfer Coefficient (HTC) and the Critical Heat Flux (CHF) in pool boiling heat transfer of water on copper surfaces has been conducted. The nanostructures on copper surfaces have been created by an electrodeposition technique. It has been found that the nanostructured copper surfaces show an increase in CHF of up to 142% and an increase in HTC of 33% over that of a mirror-finished plain copper surface. Calculations for nucleation site density and active nucleation site diameter reveal a direct correlation between these factors and the HTC, as well as the CHF. More interestingly, a contact angle study on the tested surfaces shows that there is a connection between the contact angle reduction and CHF enhancement, which confirms the contact angle mechanism of CHF with experimental evidence.
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8

Herman, Irving P. "Optical Diagnostics during Film Processing of Micro- and Nanostructures." In Microphysics of Surfaces: Nanoscale Processing. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.mfa1.

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The importance of real-time in situ sensors during the fabrication of electron and photon devices is increasing in light of tighter device tolerances, the trends toward larger wafer sizes and in situ, cluster and flexible processing, and the need for submonolayer composition control in heterostructure fabrication and surface passivation. Optical spectroscopies are often excellent diagnostics for practical control of these film processes, as well as for related fundamental and process development studies. They can be sensitive to crucial material and process parameters, and are usually noninvasive and nondestructive. The range of optical spectroscopies of the gas phase, the surface and the substrate that can be used to monitor gas-surface processes are surveyed. Of particular interest in micro- and nanoprocessing are optical probes that can determine the composition in regions near a surface or interface with submonolayer resolution and those that can measure temperature. The fundamental physical mechanisms underlying these applications are discussed.
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9

Wang, Evelyn N., Rong Xiao, Kuang-Han Chu, and Ryan Enright. "Nanoengineered Surfaces for Efficient Energy Systems." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58300.

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Nanoengineered surfaces offer new possibilities to manipulate fluid transport and enhance heat dissipation characteristics for the development of efficient energy systems. In particular, nanostructures on these surfaces can be harnessed to achieve superhydrophilicity and superhydrophobicity, and to control liquid behavior and phase-change processes. In this work, we will describe recent developments focused on using superhydrophilic nanostructure design to manipulate liquid spreading behavior and directionalities. In the presence of asymmetric nanopillars, uni-directional spreading of water droplets can be achieved where the liquid spreads only in the direction of the pillar deflection and becomes pinned on the opposite interface. In the presence of fine features on the pillars, we observed a multi-layer spreading effect due to their associated energy barriers. For both cases, we have developed energy-based models to accurately predict the liquid behavior as functions of pertinent parameters. Furthermore, we developed a semi-analytical model to predict liquid propagation rates in pillar arrays driven by capillarity. The results offer design guidelines to optimize propagation rates for fluidic wicks. These investigations offer insights and significant potential for the development and integration of advanced nanostructures to achieve efficient energy conversion systems.
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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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Звіти організацій з теми "Nanostructures - Surfaces"

1

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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2

Bozhko, S. I., A. N. Chaika, and A. M. Ionov. Vicinal Si(hhm) surfaces: templates for nanostructures fabrication. Edited by Lotfia Elnai and Ramy Mawad. Journal of Modern trends in physics research, December 2014. http://dx.doi.org/10.19138/mtpr/(14)58-64.

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3

Ynzunza, R. X., E. D. Tober, Z. Wang, F. J. Palomares, J. Morais, R. Denecke, S. Ryce, et al. Advanced photoelectron spectrometer/diffractometer for studies of the atomic, electronic, and magnetic structure of surfaces, interfaces, and nanostructures. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/603637.

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4

Picraux, Samuel Thomas, Marcin Piech, John F. Schneider, Sean Vail, Mark A. Hayes, Anthony A. Garcia, Nelson Simmons Bell, D. Gust, and Dongqing Yang. Nanostructured surfaces for microfluidics and sensing applications. Office of Scientific and Technical Information (OSTI), January 2007. http://dx.doi.org/10.2172/902205.

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5

Benderskii, Alexander V. Nonlinear Spectroscopies of Nanostructured Surfaces and Interfaces. Fort Belvoir, VA: Defense Technical Information Center, November 2009. http://dx.doi.org/10.21236/ada563142.

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Murphy, Catherine J. Nanoparticles and Nanostructured Surfaces: Novel Reporters with Biological Applications. Fort Belvoir, VA: Defense Technical Information Center, January 2001. http://dx.doi.org/10.21236/ada409010.

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Voter, A. F., and N. Stanciu. Decay of surface nanostructures via long-time-scale dynamics. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/674862.

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Armstrong, Robert. (Theme 2 Quantum Computing) Nanostructured Surface Plasmon Resonators. Fort Belvoir, VA: Defense Technical Information Center, April 2008. http://dx.doi.org/10.21236/ada481080.

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Davids, P. S., F. Intravia, and Diego A. Dalvit. Geometrically induced surface polaritons in planar nanostructured metallic cavities. Office of Scientific and Technical Information (OSTI), January 2014. http://dx.doi.org/10.2172/1114411.

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Osgood, Jr., Richard. Dynamic Studies of Photo- and Electron-Induced Reactions on Nanostructured Surfaces. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1467566.

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