Relevant bibliographies by topics / Growth and self assembly

Academic literature on the topic 'Growth and self assembly'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Growth and self assembly"

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Ostrikov, Kostya (Ken), Igor Levchenko, and Shuyan Xu. "Self-organized nanoarrays: Plasma-related controls." Pure and Applied Chemistry 80, no. 9 (January 1, 2008): 1909–18. http://dx.doi.org/10.1351/pac200880091909.

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The paper presents an investigation of self-organizational and -assembly processes of nanostructure growth on surfaces exposed to low-temperature plasmas. We have considered three main growth stages-initial, or sub-monolayer growth stage, separate nanostructure growth stage, and array growth stages with the characteristic sizes of several nm, several tens of nm, and several hundreds of nm, respectively, and have demonstrated, by the experimental data and hybrid multiscale numerical simulations, that the plasma parameters can strongly influence the surface processes and hence the kinetics of self-organization and -assembly. Our results show that plasma-controlled self-organization is a promising way to assemble large regular arrays of nanostructures.
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Rode, Sebastian, Jens Elgeti, and Gerhard Gompper. "Chiral-filament self-assembly on curved manifolds." Soft Matter 16, no. 46 (2020): 10548–57. http://dx.doi.org/10.1039/d0sm01339k.

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Chiral proteins can assemble as twisted ribbons on curved surfaces. Simulations of anisotropic building blocks on a cylindrical surface show a helical assembly with a preferred helix angle, and a power-law growth of the filament length in time.
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Yasmin, Rojoba, and Russell Deaton. "Logical computation with self-assembling electric circuits." PLOS ONE 17, no. 12 (December 7, 2022): e0278033. http://dx.doi.org/10.1371/journal.pone.0278033.

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Inspired by self-assembled biological growth, the Circuit Tile Assembly Model (cTAM) was developed to provide insights into signal propagation, information processing, and computation in bioelectric networks. The cTAM is an abstract model that produces a family of circuits of different sizes that is amenable to exact analysis. Here, the cTAM is extended to the Boolean Circuit Tile Assembly Model (bcTAM) that implements a computationally complete set of Boolean gates through self-assembled and self-controlled growth. The proposed model approximates axonal growth in neural networks and thus, investigates the computational capability of dynamic biological networks, for example, in growing networks of axons. Thus, the bcTAM models the effect of electrical activity on growth and shows how that growth might implement Boolean computations. In this sense, given a set of input voltages, the bcTAM is a system that is able to monitor and make decisions about its own growth.
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Zhang, Wan-Cheng, Meng-Dai Luoshan, Peng-Fei Wang, Chu-Yun Huang, Qu-Quan Wang, Si-Jing Ding, and Li Zhou. "Growth of Porous Ag@AuCu Trimetal Nanoplates Assisted by Self-Assembly." Nanomaterials 10, no. 11 (November 5, 2020): 2207. http://dx.doi.org/10.3390/nano10112207.

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The self-assembly process of metal nanoparticles has aroused wide attention due to its low cost and simplicity. However, most of the recently reported self-assembly systems only involve two or fewer metals. Herein, we first report a successful synthesis of self-assembled Ag@AuCu trimetal nanoplates in aqueous solution. The building blocks of multibranched AuCu alloy nanocrystals were first synthesized by a chemical reduction method. The growth of Ag onto the AuCu nanocrystals in the presence of hexadecyltrimethylammonium chloride (CTAC) induces a self-assembly process and formation of Ag@AuCu trimetal nanoplates. These nanoplates with an average side length of over 2 μm show a porous morphology and a very clear boundary with the branches of the as-prepared AuCu alloy nanocrystals extending out. The shape and density of the Ag@AuCu trimetal nanoplates can be controlled by changing the reaction time and the concentration of silver nitrate. The as-assembled Ag@AuCu nanoplates are expected to have the potential for wide-ranging applications in surface-enhanced Raman scattering (SERS) and catalysis owing to their unique structures.
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López-López, Máximo, Esteban Cruz-Hernández, Isaac Martínez-Velis, Juan Salvador Rojas-Ramírez, Manolo Ramirez-Lopez, and Álvaro Orlando Pulzara-Mora. "Self Assembly of semiconductor nanostructures." Respuestas 12, no. 2 (May 16, 2016): 47–51. http://dx.doi.org/10.22463/0122820x.570.

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Abstract In this work we present the growth and characterization of GaAs self-assembled quantum wires (SAQWRs), and InAs self-assembled quantum dots (SAQDs) by molecular beam epitaxy on (631)-oriented GaAs substrates. Adatoms on the (631) crystal plane present a strong surface diffusion anisotropy which we use to induce preferential growth along one direction to produce SAQWRs. On the other hand, InAs SAQDs were obtained on GaAs(631) with SAQWRs by the Stransky–Krastanov (S-K) growth method. SAQDs grown directly on (631) substrates presented considerable fluctuations in size. We study the effects of growing a stressor layer before the SAQDs formation to reduce these fluctuations.Keywords : Quantum wires, quantum dots; selfassembly; molecular beam epitaxy.
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Raghuwanshi, Vikram Singh, Miguel Ochmann, Frank Polzer, Armin Hoell, and Klaus Rademann. "Growth mechanisms of self-assembled gold nanoparticles in Deep Eutectic Solvent." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C891. http://dx.doi.org/10.1107/s2053273314091086.

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Self-assembled metallic nanoparticles are attractive candidates for plasmonic heating, non-linear optical switching [1], bio-analytical, chemical [2], catalytic , and surface enhanced RAMAN scattering (SERS) [3]. These applications are strongly dependent on the shape, size, composition, size distribution and volume fraction of nanoparticles. Here, self-assembly of gold nanoparticles (AuNPs) was obtained by low energy sputter deposition on Deep Eutectic Solvent (DES ; choline chloride and urea) surfaces and elucidated by Small Angle X-ray Scattering (SAXS), Cryogenic Transmission Electron Microscopy (Cryo-TEM) and UV-Vis. Data analysis shows the formation of spherically shaped AuNPs of 5 nm in diameter with narrow size distributions. Moreover, analysis reveals that prolongation of gold-sputtering time has no effect on the size of the particles and only the concentration of AuNPs increases linearly. The growth of the maxima in evaluated structure factor S(q) and the distance distribution function G(r) at higher concentrations of AuNPs is caused by the interference effects. Moreover, it indicates that the particles are not arranged in random but have a self-assembly in short-range order. Prolonged gold-sputtering time leads to increase in the ordering of the AuNPs with strong interactions. It is proposed that the self-assembly of AuNPs is due to the ionic liquid template effects of DES and the balancing physical forces. Moreover, a disulfide based stabilizer bis ((2-Mercaptoethyl) trimethylammonium) disulfide dichloride was applied to supress the self-assembly. The stabilizer even reverses the self-assembled or agglomerated AuNPs back to stable 5 nm individual particles. The templating effect of DES is compared with the non-templating solvent Castor oil. Our results will also pave a way to understand and control self-assembly of metallic and bimetallic nanoparticles.
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Chang, Wen Ku, Yu Shiang Wu, and Zhong Han Shen. "Self-Assembly of Cuprous Oxide Micro/Nanostructures by Photo-Reduction Method." Advanced Materials Research 97-101 (March 2010): 2180–83. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2180.

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This study used a photo-reduction method to investigate cuprous oxide (Cu2O) self-assembled micro/nanostructures, and design a test specimen with an electron concentration gradient distribution. It also observed the Cu2O reduction of the self-assembled structure with respect to electron density. SEM analysis was adopted to analyze the growth mechanism and growth model. The results showed that, its structure size increased with photo-reduction time, and as the reduction solution concentration increased, its structure crystallinity declined. The basic unit of a self-assembled microstructure was Cu2O at a diameter of 10~15nm, then these particles conglomerate in self-assembly to form various kinds of Cu2O micro/nanostructures with respect to reduction electron density, and primarily presented in the form of a cone or cube. In the process of continuous self-assembly, there were many micro-defects under the perfect crystal surface. Considering the growth rate, the final growth surface of the structure was (111) or (100).
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Wilts, Bodo D., Peta L. Clode, Nipam H. Patel, and Gerd E. Schröder-Turk. "Nature’s functional nanomaterials: Growth or self-assembly?" MRS Bulletin 44, no. 2 (February 2019): 106–12. http://dx.doi.org/10.1557/mrs.2019.21.

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Ahn, Sungsook, Sung Yong Jung, and Sang Joon Lee. "Self-Assembly Change by Gold Nanoparticle Growth." Journal of Physical Chemistry C 115, no. 45 (October 25, 2011): 22301–8. http://dx.doi.org/10.1021/jp2085523.

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Tanaka, Takumi, Yuki Terauchi, Akira Yoshimi, and Keietsu Abe. "Aspergillus Hydrophobins: Physicochemical Properties, Biochemical Properties, and Functions in Solid Polymer Degradation." Microorganisms 10, no. 8 (July 25, 2022): 1498. http://dx.doi.org/10.3390/microorganisms10081498.

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Hydrophobins are small amphipathic proteins conserved in filamentous fungi. In this review, the properties and functions of Aspergillus hydrophobins are comprehensively discussed on the basis of recent findings. Multiple Aspergillus hydrophobins have been identified and categorized in conventional class I and two non-conventional classes. Some Aspergillus hydrophobins can be purified in a water phase without organic solvents. Class I hydrophobins of Aspergilli self-assemble to form amphipathic membranes. At the air–liquid interface, RolA of Aspergillus oryzae self-assembles via four stages, and its self-assembled films consist of two layers, a rodlet membrane facing air and rod-like structures facing liquid. The self-assembly depends mainly on hydrophobin conformation and solution pH. Cys4–Cys5 and Cys7–Cys8 loops, disulfide bonds, and conserved Cys residues of RodA-like hydrophobins are necessary for self-assembly at the interface and for adsorption to solid surfaces. AfRodA helps Aspergillus fumigatus to evade recognition by the host immune system. RodA-like hydrophobins recruit cutinases to promote the hydrolysis of aliphatic polyesters. This mechanism appears to be conserved in Aspergillus and other filamentous fungi, and may be beneficial for their growth. Aspergilli produce various small secreted proteins (SSPs) including hydrophobins, hydrophobic surface–binding proteins, and effector proteins. Aspergilli may use a wide variety of SSPs to decompose solid polymers.
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Dissertations / Theses on the topic "Growth and self assembly"

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Cruz, Daniel Alejandro. "Hierarchical Self-Assembly and Substitution Rules." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7770.

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A set of elementary building blocks undergoes self-assembly if local interactions govern how this set forms intricate structures. Self-assembly has been widely observed in nature, ranging from the field of crystallography to the study of viruses and multicellular organisms. A natural question is whether a model of self-assembly can capture the hierarchical growth seen in nature or in other fields of mathematics. In this work, we consider hierarchical growth in substitution rules; informally, a substitution rule describes the iterated process by which the polygons of a given set are individually enlarged and dissected. We develop the Polygonal Two-Handed Assembly Model (p-2HAM) where building blocks, or tiles, are polygons and growth occurs when tiles bind to one another via matching, complementary bonds on adjacent sides; the resulting assemblies can then be used to construct new, larger structures. The p-2HAM is based on a handful of well-studied models, notably the Two-Handed Assembly Model and the polygonal free-body Tile Assembly Model. The primary focus of our work is to provide conditions which are either necessary or sufficient for the ``bordered simulation'' substitution rules. By this, we mean that a border made up of tiles is allowed to form around an assembly which then coordinates how the assembly interacts with other assemblies. In our main result, we provide a construction which gives a sufficient condition for bordered simulation. This condition is presented in graph theoretic terms and considers the adjacency of the polygons in the tilings associated to a given substitution rule. Alongside our results, we consider a collection of over one hundred substitution rules from various sources. We show that only the substitution rules in this collection which satisfy our sufficient condition admit bordered simulation. We conclude by considering open questions related to simulating substitution rules and to hierarchical growth in general.
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Molnar, G., L. Dozsa, Z. Vertesy, and Z. J. Horvath. "Thickness Dependent Growth of Epitaxial Iron Silicide Nanoobjects on Si (001)." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35180.

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Strain-induced, self-assembled iron silicide nanostructures were grown on Si(001) substrate by conventional Fe evaporation and subsequent annealing. The initial Fe thickness was in the 0.1-6.0 nm range and the annealing temperature was 850 °C. The formed phases and structures were characterized by reflection high energy electron diffraction, and scanning electron microscopy. The electrical characteristics were investigated by I-V and C-V measurements, and by DLTS. The samples show silicide nanostructure formation in the whole thickness range. The shape of the nanostructures varied from rod like to triangular and quadratic depending on the initial Fe thickness. The size distribution of the formed iron silicide nanoobjects was not homogeneous, but they were oriented in square directions on Si(001). Higher thickness resulted in increased particles size. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35180
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Jiang, Feng. "Ligand Controlled Growth of Aqueous II-VI Semiconductor Nanoparticles and Their Self-Assembly." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311311.

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Colloidal semiconductor nanoparticles (NPs) contain hundreds to thousands of atoms in a roughly spherical shape with diameters in the range of 1-10 nm. The extremely small particle size confines electron transitions and creates size tunable bandgaps, giving rise to the name quantum dots (QDs). The unique optoelectronic properties of QDs enable a broad range of applications in optical and biological sensors, solar cells, and light emitting diodes. The most common compound semiconductor combination is chalcogenide II-VI materials, such as ZnSe, CdSe, and CdTe. But III-V and group IV as well as more complicated ternary materials have been demonstrated. Coordinating organic ligands are used to cap the NP surface during the synthesis, as a mean of protecting, confining, and separating individual particles. This study investigated the impact of the ligand on particle growth and self-assembly into hierarchical structures. ZnSe QDs were synthesized using an aqueous route with four different thiol ligands, including 3-mercaptopropionic acid (MPA), thioglycolic acid (TGA), methyl thioglycolate (MTG), and thiolactic acid (TLA). The particle growth was monitored as a function of reaction time by converting the band gaps measured using UV-vis spectroscopy into particle sizes. A kinetic model based on a diffusion-reaction mechanism was developed to simulate the growth process. The growth data were fit to this model, yielding the binding strength in the order TLA < MTG ≈ TGA < MPA. This result showed the relationship between the QD growth rates and the chemical structures of the ligands. Ligands containing electron-withdrawing groups closer to the anchoring S atom and branching promoted growth, whereas longer, possibly bidendate, ligands retarded it. Removing TGA ligands from the surface of CdTe QDs in a controlled manner yielded new superstructures that were composed of either intact or fused particles. Purifying as-synthesized QDs by precipitating them using an anti-solvent removed most of the free ligand in solution. Aging this purified QD suspension for a week caused self-assembly of QDs into nanoribbons. The long time needed for self-assembly was due to the slow equilibrium between the ligands on QD surface and in solution. Accelerating the approach to equilibrium by diluting purifed CdTe QDs with organic solvents triggered rapid self-assembly of superstructures within a day, forming various nanostructures from nanoribbons to nanoflowers. The type of nanostructures that formed was determined by the solvation of TGA in the trigger solvent. Extracting the smallest portion of TGA in methanol promoted vectorial growth into ribbons consistent with dipole-dipole attractive and charge-charge repulsive interactions. Removing more of the TGA layer in IPA caused the dots to fuse into webs containing clustered ribbons and branches, and the directional nature of the superstructure was lost. Completely deprotecting the surface in acetone promoted photochemical etching and dissolved the QDs, yielding ower-like structures composed of CdS. Nanocrystal (NC) growth mediated by a ligand was also studied in the organic synthesis of FeS₂ nanocubes. Oleylamine was used not only as the ligand but also the solvent and reductant during the reaction. A one hour reaction between iron (II) chloride and elemental sulfur in oleylamine at 200 ℃ and a S to Fe ratio of 6 yielded phase pure pyrite cubes with dimensions of 87.9±14.1 nm. X-ray diffraction (XRD) spectra and Raman peaks for pyrite at 340, 375, and 426 cm⁻¹ confirmed phase purity. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results showed that the oleylamine remained on the FeS₂ surface as a ligand. The reaction mechanism includes the production of pyrrhotite Fe₁₋ᵪS (0≤x<0.5) via reduction of S⁰ to S²⁻ by oleylamine and the oxidation of pyrrhotite to pyrite with remaining S⁰.
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Bouville, Florian. "Self-assembly of anisotropic particles driven by ice growth : Mechanisms, applications and bioinspiration." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0155/document.

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Les phénomènes d'auto-assemblage sont au premier plan de la recherche en sciences des matériaux car ils comblent le vide laissé entre les procédés d'assemblage à l'échelle macroscopique et nanoscopique. L'auto-assemblage est basé sur l'organisation spontanée de composants individuels en motifs et structures. Contrôler l’agencement de la matière peut accroître les propriétés de matériaux en introduisant une certaine anisotropie. Cet agencement, comme de nombreux matériaux naturels le prouvent, peut même sous certaines conditions faire émerger de nouvelles caractéristiques. Au cours de ces trois années, nous avons utilisé l’ « ice templating » (texturation à la glace) pour déclencher l’alignement de plaquettes de dimensions microniques, le but final étant de répliquer la microstructure de la nacre. Cette technique induit la ségrégation des constituants d’une suspension à l’échelle du micron tout en obtenant des échantillons de quelques centimètres cubes. Ce procédé a permis la création de matériaux inorganique avec une microstructure semblable à la nacre, en additionnant trois niveaux de contrôles successifs : l’alignement local des plaquettes, l’alignement à longue distance des cristaux de glaces et enfin le contrôle de l’interface entre ces-mêmes plaquettes. L’utilisation d’une modélisation par éléments discrets nous a permis d’étudier la dynamique de l’auto-assemblage des particules anisotropes. Ce modèle, parce qu’il tient compte de la dynamique du procédé, nous a révélé comment l’organisation de ces particules se produit. La tomographie par rayon X a permis de visualiser les structures finales des échantillons et d’attester de la pertinence du modèle. L’alignement local des plaquettes dans les parois générées par la solidification de la glace peuvent accroître les propriétés fonctionnelles et structurales de composites. Dans ce cadres deux applications ont été étudiées : la conduction thermique dans des composites nitrure de bore hexagonal / silicone et les propriétés mécaniques d’alumine macroporeuses. Une adaptation du procédé a permis d’obtenir l’alignement à longue distance (quelques centimètres) des cristaux de glaces. Différents outils ont été développés pour caractériser la réponse fonctionnelle de ce type de composite en fonction de leurs architectures aux deux échelles considérées (celles des macropores et parois). Enfin, après la mise en place de ces deux niveaux de contrôle sur la structure, l’addition d’une phase vitreuse inorganique et de nanoparticules aux joints de grains des plaquettes a introduit, de façon similaire à la nacre, des interfaces pouvant dévier et arrêter la propagation de fissures
Self-assembly phenomena are of prime interest in materials science, because they fill the gap between assembly of macrostructure and processing of nanomaterials. Self-assembly is based on the spontaneous organization of individual small constituents into patterns and structures. Controlling the spatial arrangement can possibly improve materials properties by maximizing its response in a given direction. Furthermore, particular types of spatial arrangement, such as found in natural structures, can even induce new properties. During the past three years, we have used ice templating process to trigger the assembly of platelet-shaped particles to replicate the hierarchical structure of nacre. Control over this technique allowed structural customization at different length-scales: local orientation of the platelets, ice crystal long range order, and the control if the interfaces between the platelets. This hierarchical process has set the ground for the creation of a new fully mineral nacre-like alumina. The local platelet self-assembly triggered by ice growth was investigated by Discrete Element Modelling which provided new insight into the dynamic phenomenon responsible for the particles alignment. Synchrotron X-ray tomography was used to validated the model results. The different architecture observed in the final samples are not the result of a percolation threshold, as one could expect, but is instead a consequence of the delicate balance between pushing and engulfment at the solidification front. The local alignment of platelets can be beneficial for the functional and structural characteristics of composites and relevant aspects for two potential applications were investigated: the thermal properties of the hexagonal boron nitride/silicon rubber composites and the mechanical properties of macroporous alumina. Further adaptation of the process allowed for long range ordering of the ice crystals (up to the centimeter scale). Different tools have also been developed in order to characterize the response of composites as a function of the architecture at the level of the macropores and particle organisation. Once those two levels of alignment were achieved, the addition of a glassy phase and nanoparticles to the grain boundaries of the platelets introduces, just like in nacre, interfaces capable of deflect and even stopping crack propagation
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Hille, Pascal [Verfasser]. "Advanced group III-nitride nanowire heterostructures - self-assembly and position-controlled growth / Pascal Hille." Gießen : Universitätsbibliothek, 2017. http://d-nb.info/1132510511/34.

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Nardi, Elena. "Growth of organic nanostructures through on-surface reactions : from phthalocyanines self-assembly to polymeric phthalocyanines." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4351/document.

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Le couplage covalent de précurseurs moléculaires spécialement conçus, assisté par une surface métallique, a récemment émergé comme nouvelle voie pour la création de nouvelles architectures moléculaires prometteuses pour l’électronique moléculaire. Les phtalocyanines et leurs dérivés ont attiré beaucoup d’intérêt à cause de leurs propriétés chimiques et optoélectroniques. Dans cette thèse la synthèse de composés de phtalocyanine est présentée. Les composés sont obtenus par une réaction en surface entre précurseurs fonctionnalisés avec quatre groupements carbonitriles et des atomes métalliques. L’étude expérimentale est faite par microscopie à effet tunnel et spectroscopie de photoémission X. Les précurseurs moléculaires de TCN-DBTTF et de PPCN ont été étudiés. Les TCN-DBTTF ont été déposés avec les atomes de Mn, Fe ou Cu sur Ag(111) et Au(111). La réaction de cyclotetramerization a été activée par recuits. Dans le cas le plus favorable (TCN-DBTTF avec Fe sur Ag(111)), la réaction peut être activée à 200°C et permet la synthèse de phtalocyanines individuelles. Un recuit à plus haute température permet de continuer la réaction en 1D (250°C) et en 2D (275°C). Des résultats similaires ont été obtenus pour le dépôt de PPCN avec Mn ou Cu sur Au(111). L’évolution des spectres des niveaux de coeur permet d’obtenir une preuve de la réaction. Les différents facteurs qui influencent la cyclotetramerisation ont été étudiés.L'étude démontre la versatilité de la méthode: la synthèse en surface permet la création de polymères 2D originaux connectés par des macrocycles de phtalocyanine susceptibles d’être étendus à un grand nombre de précurseurs et d’atomes métalliques
Surface-assisted covalent coupling of suitably designed molecular precursors on metal surfaces has recently emerged as a new route towards the design of novel molecular architectures promising for future applications. Phthalocyanines and their derivatives have been widely studied for their chemical and optoelectronic properties. In this thesis the synthesis of phthalocyanine compounds is presented. The compounds are obtained through an on-surface reaction between tetracarbonitrile-functionalized precursors and metals. The experimental investigation is carried out by means of scanning tunnelling microscopy and X-Ray photoemission spectroscopy. Two molecular precursors, TCN-DBTTF and PPCN, are studied. TCN-DBTTF molecules are deposited with metal atoms (Mn, Fe, or Cu) on Ag(111) and Au(111). Annealing is used to activate the reaction of cyclotetramerization between precursors and metals. In the most favourable case (TCN-DBTTF with Fe on Ag(111)) the reaction can be activated at 200°C and leads to the synthesis of individual phthalocyanines. Increasing the temperature allows the synthesis of polymeric lines, at 250°C, and small 2D domains, at 275°C. Similar results are obtained for PPCN deposition with Mn or Cu on Au(111). In this latter case, the evolution of core level spectra allows a chemical proof of the on-surface reaction. The factors affecting on-surface cyclotetramerization have also been studied. This study demonstrates the versatility of the method: on-surface cyclotetramerization allows creating original 2D polymers connected by phthalocyanine macrocycles, and may work with a wide range of tetracarbonitrile-functionalized precursors and metallic atoms
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Davey, Roger J. "The nucleation and growth of crystals from solution - molecular self assembly, materials science and process technology." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525976.

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Dahal, Yuba Raj. "Equilibrium and kinetic factors in protein crystal growth." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/36220.

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Doctor of Philosophy
Department of Physics
Jeremy D. Schmit
Diseases such as Alzheimer’s, Parkinson’s, eye lens cataracts, and Type 2 diabetes are the results of protein aggregation. Protein aggregation is also a problem in pharmaceutical industry for designing protein based drugs for long term stability. Disordered states such as precipitates and gels and ordered states such as crystals, micro tubules and capsids are both possible outcomes of protein–protein interaction. To understand the outcomes of protein–protein interaction and to find the ways to control forces, it is required to study both kinetic and equilibrium factors in protein–protein interactions. Salting in/salting out and Hofmeister effects are familiar terminologies used in protein science field from more than a century to represent the effects of salt on protein solubility, but they are yet to be understood theoretically. Here, we build a theory accounting both attractive and repulsive electrostatic interactions via the Poisson Boltzmann equation, ion–protein binding via grand cannonical partition function and implicit ion–water interaction using hydrated ion size, for describing salting in/salting out phenomena and Hofmeister and/or salt specific effect. Our model free energy includes Coulomb energy, salt entropy and ion–protein binding free energy. We find that the salting in behavior seen at low salt concentration near the isoelectric point of the protein is the output of Coulomb energy such that the addition of salt not only screens dipole attraction but also it enhances the monopole repulsion due to anion binding. The salting out behavior appearing after salting in at high salt concentration is due to a salt mediated depletion interaction. We also find that the salting out seen far from the isoelectric point of the protein is dominated by the salt entropy term. At low salt, the dominant effect comes from the entropic cost of confining ions within the aggregates and at high salt, the dominant effect comes from the entropy gain by ions in solution by enhancing the depletion attraction. The ion size has significant effects on the entropic term which leads to the salt specificity in the protein solubility. Crystal growth of anisotropic and fragile molecules such as proteins is a challenging task because kinetics search for a molecule having the correct binding state from a large ensemble of molecules. In the search process, crystal growth might suffer from a kinetic trap called self–poisoning. Here, we use Monte Carlo simulation to show why protein crystallization is vulnerable to the poisoning and how one can avoid such trap or recover crystal growth from such trap during crystallization. We show that self–poisoning requires only three minimal ingredients and these are related to the binding affinity of a protein molecule and its probability of occurrence. If a molecule attaches to the crystal in the crystallographic state then its binding energy will be high but in protein system this happens with very low probability (≈ 10−5). On the other hand, non–crystallographic binding is energetically weak, but it is highly probable to happen. If these things are realized, then it will not be surprising to encounter with self–poisoning during protein crystallization. The only way to recover or avoid poisoning is to alter the solution condition slightly such as by changing temperature or salt concentration or protein concentration etc.
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Farrer, I. "Growth and applications of self-assembled quantum dots." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598945.

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This thesis describes studies of the growth and subsequent characterisation of wafers containing layers of Self-Assembled Quantum Dots grown by Molecular Beam Epitaxy (MBE). Insertion of such layers into transport structures is of particular interest for the creation of the new generation of optoelectronic devices. The growth of calibration structures containing InAs/GaAs Self-Assembled Quantum Dots is then outlined and certain growth parameters varied with the aim of tuning the emission energy and achieving narrow linewidths in the photoluminescence spectrum. Utilising the inherent non-uniformity of the Indium cell, which originates from the crucible design, we are able to achieve radial variations in the deposited thickness. Consequently, it has been possible to study the early stages of dot formation in some detail via the growth of uncapped samples for subsequent study using an Atomic Force Microscope (AFM). The properties of electrical devices containing a layer of InAs dots are discussed. In particular the mobility of an adjacent two-dimensional electron gas (2DEG) is strongly affected by the charge state of the dots themselves. In this structure it is possible to alter the charge state by either illumination, which removes charge from the dots, or by application of a positive gate voltage, which recharges the dots. After illumination the channel resistance drops significantly and persists for long timescales. This effect enables the creation of new types of optical memory or photon detector structures.
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Yoshikawa, Taro [Verfasser], and Oliver [Akademischer Betreuer] Ambacher. "Toward ultra-thin nanocrystalline diamond film growth: electrostatic self-assembly of non-aggregated diamond nanoparticles onto substrate surfaces." Freiburg : Universität, 2017. http://d-nb.info/115294469X/34.

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Books on the topic "Growth and self assembly"

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A, Golovin A., Nepomni͡ashchiĭ A. A, and NATO Public Diplomacy Division, eds. Self-assembly, pattern formation and growth phenomena in nano-systems. Dordrecht: Springer, 2006.

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Pelesko, John A. Self Assembly. London: Taylor and Francis, 2007.

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Nagarajan, Ramanathan, ed. Self-Assembly. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119001379.

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Chen, Xi, ed. Mechanical Self-Assembly. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-4562-3.

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McManus, Jennifer J., ed. Protein Self-Assembly. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9678-0.

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Nilsson, Bradley L., and Todd M. Doran, eds. Peptide Self-Assembly. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7811-3.

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Preece, Jon Andrew. From self-assembly to self-organisation. Birmingham: University of Birmingham, 1994.

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Self-directed growth. Muncie, Ind: Accelerated Development, 1988.

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Cusack, Lucy M. Self-assembly of heterosupermolecules. Dublin: University College Dublin, 1997.

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Bellucci, Stefano, ed. Self-Assembly of Nanostructures. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-0742-3.

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Book chapters on the topic "Growth and self assembly"

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Papadopoulos, Christo. "Direct-Growth and Self-assembly." In SpringerBriefs in Materials, 45–61. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31742-7_7.

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Persichetti, L., A. Capasso, A. Sgarlata, M. Fanfoni, N. Motta, and A. Balzarotti. "Towards a Controlled Growth of Self-assembled Nanostructures: Shaping, Ordering, and Localization in Ge/Si Heteroepitaxy." In Self-Assembly of Nanostructures, 201–63. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0742-3_4.

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Guldin, Stefan. "Crystal Growth in Block Copolymer-Derived Mesoporous TiO $$_2$$ 2." In Inorganic Nanoarchitectures by Organic Self-Assembly, 87–100. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00312-2_6.

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Baryshnikov, Yuliy, Ed Coffman, Nadrian Seeman, and Teddy Yimwadsana. "Self-correcting Self-assembly: Growth Models and the Hammersley Process." In DNA Computing, 1–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11753681_1.

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Henneberger, F. "7.4.1 Self-assembled quantum dots: Introduction." In Growth and Structuring, 352–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-68357-5_64.

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Skjeltorp, A. T., J. Akselvoll, K. de Lange Kristiansen, G. Helgesen, R. Toussaint, E. G. Flekkøy, and J. Cernak. "Self-Assembly and Dynamics of Magnetic Holes." In Forces, Growth and Form in Soft Condensed Matter: At the Interface between Physics and Biology, 165–79. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-2340-5_9.

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Springholz, G., and G. Bauer. "9.6 Self-assembled Stranski-Krastanow quantum dots." In Growth and Structuring, 501–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-68357-5_93.

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Tokar, V. I., and H. Dreyssé. "Self-Assembly of Few-Atom Clusters in a Model of a Strained Submonolayer." In Atomistic Aspects of Epitaxial Growth, 429–37. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0391-9_32.

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Tersoff, J. "Role of Stress in the Self-Assembly of Nanostructures." In Low Dimensional Structures Prepared by Epitaxial Growth or Regrowth on Patterned Substrates, 13–17. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0341-1_2.

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Springholz, G., and G. Bauer. "9.6.1 Growth of self-assembled lead-salt quantum dots." In Growth and Structuring, 503–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-68357-5_94.

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Conference papers on the topic "Growth and self assembly"

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Frechette, Stephen, Yong Bin Kim, and F. Lombardi. "Checkpointing of Rectilinear Growth in DNA Self-Assembly." In 2008 23rd IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems (DFTVS). IEEE, 2008. http://dx.doi.org/10.1109/dft.2008.10.

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Wang, Benzhong, and Soo-Jin Chua. "Self-organized growth of InP on GaAs substrate by MOCVD." In International Symposium on Microelectronics and Assembly, edited by H. Barry Harrison, Andrew T. S. Wee, and Subhash Gupta. SPIE, 2000. http://dx.doi.org/10.1117/12.405393.

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Masoud Hashempour, Zahra Mashreghian Arani, and Fabrizio Lombardi. "Robust self-assembly of interconnects by parallel DNA growth." In 2007 IEEE International Symposium on Nanoscale Architectures. IEEE, 2007. http://dx.doi.org/10.1109/nanoarch.2007.4400860.

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Chandramohan, Abhishek, Nikolai Sibirev, Vladimir G. Dubrovskii, Budhika Mendis, Mike C. Petty, Andrew J. Gallant, and Dagou A. Zeze. "Self-assembly based nanometer-scale patterning for nanowire growth." In SPIE Nanoscience + Engineering, edited by Eva M. Campo, Elizabeth A. Dobisz, and Louay A. Eldada. SPIE, 2015. http://dx.doi.org/10.1117/12.2188016.

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Kladitis, Paul E., and Victor M. Bright. "Novel Resistive Point Heater for MEMS Remote Solder Self-Assembly." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1087.

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Abstract MEMS structures can be assembled using the surface tension of molten solder (solder self-assembly). Until this novel development, solder self-assembly was performed at the wafer or chip level where the whole chip needed to be heated to melt the micro sized solder droplets used to assemble devices. In this paper we present the design, testing, and modeling of a resistive point heater that is used to assemble an individual device on a chip without affecting neighboring devices. The point heater was packaged in 14 and 24 pin ceramic dual inline packages and tested in air, nitrogen, and formic-acid/nitrogen vapor. The lowest power needed to liquify a 63Sn/37Pb, 8 mil diameter equivalent volume solder droplet and assemble a device in formic-acid/nitrogen vapor was found to be 714 mW. The average power, of several trials, required to liquify a solder droplet is 998 mW at 141 mA and 7.08 V. A steady-state heat transfer model predicts 986.4 mW is required to keep the droplet at 181 °C (the observed minimum temperature at which 63Sn/37Pb solder is in liquid state). Growth of pure Sn platey crystals, varified by X-ray flourescence, was noted on the point heater assembly and surroundings during assembly in formic-acid/nitrogen vapor.
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Hajilounezhad, Taher, and Matthew R. Maschmann. "Numerical Investigation of Internal Forces During Carbon Nanotube Forest Self-Assembly." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86567.

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A time-resolved two-dimensional finite element simulation is developed to model the forces generated during the self-assembly of actively growing CNT populations with distributed properties and growth characteristics. CNTs are simulated as interconnected frame elements that undergo the base growth mechanism. Mechanical equilibrium at each computational node is determined at each time step using the Updated Lagrangian method. Emphasis is placed on the transmission of force to the growth substrate, where catalyst particles reside. The simulated CNT forest structural morphology is similar to that of physical CNT forests, and results indicate that stresses on the order of GPa are transmitted to catalyst particles. The force transmitted to a given catalyst particle is correlated to the rate at which the CNT grows relative to the population averaged growth rate. The effect of diameter-dependent CNT growth rates and the persistence of vdW bonds are also examined relative to the forces generated during forest self-assembly. Results from this study may be applied to the study of CNT forest self-assembly, resultant ensemble forest properties, and force-modulated CNT growth kinetics.
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Simmonds, Paul J. "Quantum dot growth on (111) and (110) surfaces using tensile-strained self-assembly." In Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XV, edited by Diana L. Huffaker and Holger Eisele. SPIE, 2018. http://dx.doi.org/10.1117/12.2299676.

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Wang, Yunran, Mark Hopkinson, Im Sik Han, Saraswati Behera, and Chaoyuan Jin. "Directed self-assembly of InAs quantum dots using in situ interference lithography." In Quantum Dots, Nanostructures, and Quantum Materials: Growth, Characterization, and Modeling XVII, edited by Diana L. Huffaker and Holger Eisele. SPIE, 2020. http://dx.doi.org/10.1117/12.2544875.

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Ahn, Jaewoo, Jung Seob Shim, and Dong Hyun Lee. "Fabrication of quantum-dot light-emitting devices using template-assisted self-assembly (Conference Presentation)." In Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XVI, edited by Diana L. Huffaker and Holger Eisele. SPIE, 2019. http://dx.doi.org/10.1117/12.2508452.

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Taylor, Curtis, Eric Stach, Gregory Salamo, and Ajay Malshe. "Nanoindentation Assisted Self-Assembly of Quantum Dots." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21139.

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The ability to pattern quantum dots with high spatial positioning and uniform size is critical for the realization of future electronic devices with novel properties and performance that surpass present technology. This work discusses the exploration of an innovative nanopatterning technique to direct the self-assembly of nanostructures. The technique focuses on perturbing surface strain energy by nanoindentation in order to mechanically bias quantum dot nucleation. Growth of InAs quantum dots on nanoindent templates is performed using molecular beam epitaxy (MBE). The effect of indent spacing and size on the patterned growth is investigated. The structural analysis of the quantum dots including spatial ordering, size, and shape are characterized by ex-situ atomic force microscopy (AFM). Results reveal that the indent patterns clearly bias nucleation with dot structures selectively growing on top of each indent. It is speculated that the biased nucleation is due to a combination of favorable surface strain attributed to subsurface dislocation strain fields and/or multi-atomic step formation at the indent sites, which leads to increased adatom diffusion on the patterned area.
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Reports on the topic "Growth and self assembly"

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Hsu, Julia W. P. Nanolithography Directed Materials Growth and Self-Assembly. Office of Scientific and Technical Information (OSTI), October 2006. http://dx.doi.org/10.2172/1137213.

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Huang, Rui. Volmer-Weber Growth of Nanoscale Self-Assembled Quantum Dots. Office of Scientific and Technical Information (OSTI), August 2009. http://dx.doi.org/10.2172/1054166.

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Hwang, Robert Q., Carol S. Ashley, C. Jeffrey Brinker, Christine Charlotte Mitchell, Michael Ewald Bartram, and Michael Elliott Coltrin. Self-Assembled Templates for Fabricating Novel Nano-Arrays and Controlling Materials Growth. Office of Scientific and Technical Information (OSTI), February 2002. http://dx.doi.org/10.2172/794247.

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Dye, R. C., R. E. Hermes, M. G. Martinez, and N. M. Peachey. Inorganic-organic composite nanoengineered films using self-assembled monolayers for directed zeolite film growth. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/534511.

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Thomson, T. Silicide formation and particle size growth in high temperature annealed, self-assembled FePt nanoparticle arrays. Office of Scientific and Technical Information (OSTI), October 2003. http://dx.doi.org/10.2172/826528.

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CURRO, JOHN G., JOHN DWANE MCCOY, AMALIE L. FRISCHKNECHT, and KUI YU. Molecular Self-Assembly. Office of Scientific and Technical Information (OSTI), November 2001. http://dx.doi.org/10.2172/789581.

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Lavin, Judith, Richard Alan Kemp, and Constantine A. Stewart. Photovoltaic self-assembly. Office of Scientific and Technical Information (OSTI), October 2010. http://dx.doi.org/10.2172/1011215.

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Furst, Eric M. Directed Self-Assembly of Nanodispersions. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1105006.

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De Yoreo, J., W. D. Wilson, and T. Palmore. Solvent mediated self-assembly of solids. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/674420.

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Cheng, Shengfeng, Steven James Plimpton, Jeremy B. Lechman, and Gary Stephen Grest. Drying/self-assembly of nanoparticle suspensions. Office of Scientific and Technical Information (OSTI), October 2010. http://dx.doi.org/10.2172/993324.

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