Relevant bibliographies by topics / Nucleation. Catalysis

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Nucleation. Catalysis'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Nucleation. Catalysis.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Nucleation. Catalysis"

1

Hoffmeyer, M. K., and J. H. Perepezko. "Nucleation catalysis by dispersed particles." Scripta Metallurgica 22, no. 7 (January 1988): 1143–48. http://dx.doi.org/10.1016/s0036-9748(88)80120-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

de Cicco, Michael P., and John H. Perepezko. "Catalytic Effect of Nanoparticles on Primary and Secondary Phase Nucleation." Materials Science Forum 765 (July 2013): 250–54. http://dx.doi.org/10.4028/www.scientific.net/msf.765.250.

Full text
Abstract:
Nanoparticles were shown to catalyze nucleation of primary and secondary phases in metal matrix nanocomposites (MMNCs). This catalysis is important as it contributes to the mechanical property enhancement in the MMNCs. Primary aluminium grain refinement was demonstrated in A356 matrix nanocomposites. Various types and sizes of nanoparticles (SiC, TiC, γ-Al2O3; 10-96 nm) were used to make these MMNCs and in all cases the MMNCs had smaller, more equiaxed grains compared to the reference A356. Using the droplet emulsion technique, undercoolings were shown to be significantly reduced. Undercoolings in the MMNCs were in good general agreement with the undercooling necessary for free growth, suggesting the applicability of this model to nucleation on nanoscale catalysts. Secondary phase nucleation catalysis was demonstrated in a zinc alloy AC43A MMNC and a binary Mg-4Zn MMNC. In AC43A, secondary phase nucleation was catalyzed with the addition of various nanoparticles (TiC, SiC, γ-Al2O3). The secondary phase nucleation catalysis in AC43A coincided with ductility enhancement. In Mg-4Zn, SiC nanoparticle addition changed the secondary phases that formed. MgZn2 was formed in the MMNC at relatively high temperatures consuming the Zn and reducing the amount of the low temperature Mg2Zn3 phase that formed in the reference alloy. The change in secondary phase formation coincided with significant enhancement in strength and ductility.
APA, Harvard, Vancouver, ISO, and other styles
3

von Windheim, Jesko A., and Jeffrey T. Glass. "Improved uniformity and selected area deposition of diamond by the oxy-acetylene flame method." Journal of Materials Research 7, no. 8 (August 1992): 2144–50. http://dx.doi.org/10.1557/jmr.1992.2144.

Full text
Abstract:
The role of SiO2 in nucleation of diamond has been investigated in an oxy-acetylene flame. It was found that growth methods that minimize SiO2 formation enhance diamond nucleation. A short pretreatment of a scratched Si surface in a low oxygen-to-acetylene ratio flame, at a distance 1.5 cm from the flame core, significantly improved uniformity of subsequent diamond growth. When scratched surfaces were intentionally oxidized, nucleation of diamond was completely inhibited. By using a mask to controllably deposit SiO2 on a scratched Si surface, highly selective deposition of diamond was achieved with resolution below 5 μm. These results are discussed with reference to competing oxidation and carbon formation processes that take place during the nucleation of diamond. During the nucleation stage, carbon may be deposited on the scratched Si via a route in which the Si surface catalyzes carbon formation reactions that are otherwise kinetically unfavorable. The formation of an oxide layer, on the other hand, would act to passivate the surface, and thus inhibit carbon formation via a catalytic route. The decomposition of CO to C and CO2 is given as an example of a reaction that is favored at temperatures below 1000 K, but requires surface catalysis to proceed because it remains frozen out in the gas phase due to a very slow reaction rate.
APA, Harvard, Vancouver, ISO, and other styles
4

Perepezko, J. H., and W. S. Tong. "Nucleation–catalysis–kinetics analysis under dynamic conditions." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 361, no. 1804 (January 27, 2003): 447–61. http://dx.doi.org/10.1098/rsta.2002.1151.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Li, Xin Yu. "Mechanisms of 1D Crystal Growth in Chemical Vapor Deposition: ZnO Nanowires." Advanced Materials Research 463-464 (February 2012): 1463–67. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1463.

Full text
Abstract:
Abstract. ZnO nanowires synthesis throught oxidative evaporation of pure zinc powder without catalyst is studied in detail to understand the nucleation and growth mechanisms involved with the so-called “self-catalysis” schemes. The structural features associated with different growth stages were monitored using scanning electron microscopy (SEM), describe the direct observation of the nucleation and growth process. X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) demonstrate that the as-obtained sample can be indexed to high crystallinity with wurtzite structure and only contain Zn and O without the presence of any impurities.
APA, Harvard, Vancouver, ISO, and other styles
6

Todorova, S., J. W. P. Schmelzer, and I. Gutzow. "Nucleation Catalysis in Metastable Liquids: Inborn Active Sites." Crystal Research and Technology 35, no. 5 (May 2000): 515–27. http://dx.doi.org/10.1002/1521-4079(200005)35:5<515::aid-crat515>3.0.co;2-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Liang, Wei, Hao Yan, Chen Chen, Dong Lin, Kexin Tan, Xiang Feng, Yibin Liu, Xiaobo Chen, Chaohe Yang, and Honghong Shan. "Revealing the Effect of Nickel Particle Size on Carbon Formation Type in the Methane Decomposition Reaction." Catalysts 10, no. 8 (August 6, 2020): 890. http://dx.doi.org/10.3390/catal10080890.

Full text
Abstract:
Carbon species deposition is recognized as the primary cause of catalyst deactivation for hydrocarbon cracking and reforming reactions. Exploring the formation mechanism and influencing factors for carbon deposits is crucial for the design of rational catalysts. In this work, a series of NixMgyAl-800 catalysts with nickel particles of varying mean sizes between 13.2 and 25.4 nm were obtained by co-precipitation method. These catalysts showed different deactivation behaviors in the catalytic decomposition of methane (CDM) reaction and the deactivation rate of catalysts increased with the decrease in nickel particle size. Employing TG-MS and TEM characterizations, we found that carbon nanotubes which could keep catalyst activity were more prone to form on large nickel particles, while encapsulated carbon species that led to deactivation were inclined to deposit on small particles. Supported by DFT calculations, we proposed the insufficient supply of carbon atoms and rapid nucleation of carbon precursors caused by the lesser terrace/step ratio on smaller nickel particles, compared with large particles, inhibit the formation of carbon nanotube, leading to the formation of encapsulated carbon species. The findings in this work may provide guidance for the rational design of nickel-based catalysts for CDM and other methane conversion reactions.
APA, Harvard, Vancouver, ISO, and other styles
8

Chatterjee, Dipanwita, Akash R, K. Kamalnath, Rafia Ahmad, Abhishek Kumar Singh, and N. Ravishankar. "Orientation Selection during Heterogeneous Nucleation: Implications for Heterogeneous Catalysis." Journal of Physical Chemistry C 121, no. 18 (April 27, 2017): 10027–37. http://dx.doi.org/10.1021/acs.jpcc.7b02237.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

De Cicco, Michael P., Lih-Sheng Turng, Xiaochun Li, and John H. Perepezko. "Nucleation Catalysis in Aluminum Alloy A356 Using Nanoscale Inoculants." Metallurgical and Materials Transactions A 42, no. 8 (January 29, 2011): 2323–30. http://dx.doi.org/10.1007/s11661-011-0607-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Dokter, Wim H., Harold F. van Garderen, Theo P. M. Beelen, Rutger A. van Santen, and Wim Bras. "Homogeneous versus Heterogeneous Zeolite Nucleation." Angewandte Chemie International Edition in English 34, no. 1 (January 16, 1995): 73–75. http://dx.doi.org/10.1002/anie.199500731.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Nucleation. Catalysis"

1

Iachella, Mathilde. "Nucléation, Croissance et Morphologie de Nanoparticules d'Or et d'Or-Cuivre sur Support Rutile par la Théorie de la Fonctionnelle de la Densité." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEN034/document.

Full text
Abstract:
Dans cette étude, la nucléation, la croissance, la morphologie et la réactivité de nanoparticules Au, Cu et AuCu sont examinées sur support rutile TiO2 (110) stoechiométrique, réduit et hydraté. En premier lieu, la nucléation a été modélisée via l’adsorption et la diffusion d’atomes Au et Cu, à l’aide de calculs de type théorie de la fonctionnelle de la densité (DFT), et de diagrammes d’énergie libre en condition réaliste.Les résultats DFT+U ont montré le rôle promoteur des espèces hydroxyles en surface sur la nucléation, en accord avec les mesures expérimentales de microscopie STM. Ensuite, les propriétés thermodynamiques de croissance et de coalescence de clusters Au et Cu (de 1 à 38 atomes) ont été étudiées par une approche systématique qui a déterminé précisément la stabilité relative d’un grand nombre de structures, tout en soulignant la différence de compétition nucléation/croissance entre les deux métaux. Pour des tailles de particules comprises entre 38 et 201 atomes, et des morphologies variées, la stabilité absolue d’agrégats purs Au et Cu et de nanoalliages AuCu a été évaluée à l’aide de calculs d’énergie de surface. Cette approche a révélé l’existence de relations linéaires entre composition chimique et stabilité. Enfin, la réactivité de nanoparticules Au, Cu et AuCu a été examinée suivant deux aspects : le dépôt de clusters de 38 atomes sur support rutile stoechiométrique, et l’adsorption du monoxyde de carbone à l’interface entre le métal et le support.Cette adsorption est une étape clé pour la réaction d’oxydation du CO ; un procédé important en catalyse hétérogène
In this study, the nucleation, growth, morphology and reactivity of Au, Cu and AuCu nanoparticles have been examined on rutile TiO2 (110) stoiciometric, reduced and hydrated supports. First, the nucleation has been modeled via the adsorption and diffusion of Au and Cu atoms, thanks to density functional theory (DFT) calculations, and free energy diagrams in realistic conditions. DFT+U results have shown the promotor role of surface hydroxyl species on the nucleation, in agreement with STM experimental measurements.Then, the growth and coalescence thermodynamic properties for Au and Cu clusters (from 1 to 38 atoms) have been investigated with a systematic approach which has determinated precisely the relative stability for a large number of structures, and has underlined the difference for the competition between nucleation and growth between the two metals. For particles in the range 38-201 atoms and varied morphologies, the absolute stability of Au and Cu aggregates and AuCu nanoalloys has been evaluated through surface energy calculations. This approach has revealed the existence of linear relations between the chemical composition and the stability.Finally, the reactivity of Au, Cu and AuCu nanoparticles has been examined following two aspects : the deposition of 38 atoms clustered on the stoichiometric rutile support, and the adsorption of carbon monoxide at the interface between the metal and the support. This adsorption is a key step for the CO oxidation reaction ; an important process in heterogeneous catalysis
APA, Harvard, Vancouver, ISO, and other styles
2

Brun, Nicolas. "Chimie intégrative pour la conception de matériaux poreux fonctionnels avancés et applications." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00593936.

Full text
Abstract:
Une organisation contrôlée de la porosité offre l'opportunité de combiner les avantages structuraux des macropores (diamètres supérieures à 50 nm), assurant l'intégrité et l'interconnectivité de l'ossature du matériau, avec ceux des pores plus étroits (méso- et micropores), déployant des surfaces spécifiques réactives importantes. L'élaboration de telles architectures, dites " hiérarchisées ", à l'échelle du laboratoire représente un véritable défi physico-chimique. Dans ce contexte, ce travail de thèse s'intéresse à l'élaboration de matériaux poreux fonctionnels avancés, s'inscrivant dans le concept de chimie intégrative, en combinant matière molle (mésophases lyotropes, émulsions directes concentrées, auto-assemblages organique-organique, etc.), procédé sol-gel, polymérisation organique et principe de l'empreinte " dure ". Dans une première approche générale, des monolithes hybrides macrocellulaires à base de silice ont été fonctionnalisés par greffage covalent post-synthèse ou par co-condensation de précurseurs organosilanes appropriés. Dès lors, l'encapsulation de complexes luminescents (ions europium), de catalyseurs métalliques piégés dans une phase liquide ionique supportée (sels ou nanoparticules de palladium), ou d'entités biologiques (enzymes hydrosolubles : lipases) a offert une modulation rationnelle des propriétés optiques, catalytiques ou biocatalytiques induites in fine. Dans une seconde approche générale, l'utilisation de monolithes de silice macrocellulaires comme empreintes dures " sacrificielles " a permis la genèse de composés carbonés poreux, associée à un contrôle structural sur plusieurs échelles. Dès lors, une surface spécifique développée et une porosité hiérarchisée, conjuguées à des propriétés intrinsèques opportunes (stabilités thermique et chimique, conductivité électrique), ont offert un large champ d'applications, comme électrodes pour systèmes de stockage de l'énergie électrochimique (batteries Li-ion et condensateurs à double couche électrochimique), sites de nucléation de borohydrures de lithium (LiBH4) pour le stockage de l'hydrogène, ou encore comme électrodes enzymatiques pour biopiles.
APA, Harvard, Vancouver, ISO, and other styles
3

Cheze, Caroline. "Investigation and comparison of GaN nanowire nucleation and growth by the catalyst-assisted and self-induced approaches." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16281.

Full text
Abstract:
Diese Arbeit befasst sich mit der Keimbildung und den Wachstumsmechanismen von GaN-Nanodrähten (NWs), die mittels Molekularstrahlepitaxie (MBE) hergestellt wurden. Die Hauptneuheiten dieser Studie sind der intensive Gebrauch von in-situ Messmethoden und der direkte Vergleich zwischen katalysatorfreien und katalysatorinduzierten NWs. In der MBE bilden sich GaN-NWs auf Silizium ohne Katalysator. Auf Saphir dagegen wachsen NWs unter den gleichen Bedingungen nur in der Anwesenheit von Ni-Partikeln. Die Nukleationsprozesse sind für beide Ansätze fundamental verschieden. In dem katalysatorinduzierten Ansatz reagiert Ga stark mit den Ni-Keimen, deren Kristallstruktur für das Nanodraht-Wachstum entscheidend sind, während in dem katalysatorfreien Ansatz bildet N eine Zwischenschicht mit Si vor der ausgeprägten GaN-Nukleation. Mittels beider Ansätze wachsen einkristalline wurtzite GaN-NWs in Ga-polarer Richtung. Allerdings sind unter denselben Wachstumsbedingungen die katalysatorinduzierten NWs länger als die katalysatorfrei gewachsenen und enthalten viele Stapelfehler. Im Vergleich sind die katalysatorfreien größtenteils defektfrei und ihre Photolumineszenz ist viel intensiver als jene der katalysatorinduzierten NWs. Alle diese Unterschiede können auf den Katalysator zurückgefürt werden. Die Ni-Partikel sammeln die an den Nanodraht-Spitzen ankommenden Ga-Atome ef?zienter ein als die unbedeckte oberste Facette im katalysatorfreien Fall. Außerdem können Stapelfehler sowohl aus der zusätzlichen Festkörperphase des Ni-Katalysators als auch aus der Verunreinigung der NWs mit Katalysatormaterial resultieren. Solch eine Kontaminierung würde schließlich nicht-strahlende Rekombinationszentren verursachen. Somit mag die Verwendung von Katalysatorkeimen zusätzliche Möglichkeiten bieten, das Wachstum von NWs zu kontrollieren. Jedoch sind sowohl die strukturellen als auch die optischen Materialeigenschaften der katalysatorfreien NWs überlegen.
This work focuses on the nucleation and growth mechanisms of GaN nanowires (NWs) by molecular beam epitaxy (MBE). The main novelties of this study are the intensive employment of in-situ techniques and the direct comparison of self-induced and catalyst-induced NWs. On silicon substrates, GaN NWs form in MBE without the use of any external catalyst seed. On sapphire, in contrast, NWs grow under identical conditions only in the presence of Ni seeds. The processes leading to NW nucleation are fundamentally different for both approaches. In the catalyst-assisted approach, Ga strongly reacts with the catalyst Ni particles whose crystal structure and phases are decisive for the NW growth, while in the catalyst-free approach, N forms an interfacial layer with Si before the intense nucleation of GaN starts. Both approaches yield monocrystalline wurtzite GaN NWs, which grow in the Ga-polar direction. However, the catalyst-assisted NWs are longer than the catalyst-free ones after growth under identical conditions, and they contain many stacking faults. By comparison the catalyst-free NWs are largely free of defects and their photoluminescence is much more intense than the one of the catalyst-assisted NWs. All of these differences can be explained as effects of the catalyst. The seed captures Ga atoms arriving at the NW tip more efficiently than the bare top facet in the catalyst-free approach. In addition, stacking faults could result from both the presence of the additional solid phase constituted by the catalyst-particles and the contamination of the NWs by the catalyst material. Finally, such contamination would generate non-radiative recombination centers. Thus, the use of catalyst seeds may offer an additional way to control the growth of NWs, but both the structural and the optical material quality of catalyst-free NWs are superior.
APA, Harvard, Vancouver, ISO, and other styles
4

Champouret, Yohan D. M. "Late transition metal complexes of bulky mono- and bi-nucleating ligands : synthesis and catalytic applications." Thesis, University of Leicester, 2006. http://hdl.handle.net/2381/29977.

Full text
Abstract:
In Chapter One, a background to the application of binucleating ligands in biomimetic chemistry sets the scene for a comprehensive discussion of homogeneous catalysis in the field. Chapter Two describes the strategies employed for the preparation of sterically encumbered multidentate oligopyridylimine ligands. In Chapters Three and Four, the new oligopyidylimine ligands prepared in Chapter Two are treated with divalent metal halides (iron, cobalt, nickel, zinc) and the resultant complexes fully characterised. Specifically, Chapter Three focuses on the reactivity of the potentially pentadentate ligands [bis(imino)terpyridine and imino-quaterpyridine] while Chapter Four concentrates on the resulting coordination chemistry of the potential tetra-, hexa- and hepta-dentate ligands [imino-terpyridine, bis(imino)quaterpyridine and bis(imino)quinquepyridine]. In both chapters, theoretical calculations (DFT) on pre-identified complexes are used in order to investigate the effect of the R substituent (H vs. Me) and metal centre on the coordination chemistry of the ligand. To conclude the synthetic work, the screening for polymerisation or oligomerisation of ethylene is systematically investigated with a selection of the new complexes. In Chapter Five, the synthesis of multidentate ligands featuring sterically encumbered imino-pyridine end-groups linked by phenyl-, thiophene- and phenolate-spacers is studied. The new (pro)ligands are fully characterised and their coordination chemistry with the same series of divalent metal halides is investigated. Furthermore, derivatisation of pre-identified bimetallic complexes is performed. Finally, a selection of the bimetallic compounds is screened as precatalysts for the oligomerisation and/or polymerisation of ethylene.
APA, Harvard, Vancouver, ISO, and other styles
5

Chèze, Caroline [Verfasser], H. [Akademischer Betreuer] LUETH, W. T. [Akademischer Betreuer] Masselink, and H. [Akademischer Betreuer] Riechert. "Investigation and comparison of GaN nanowire nucleation and growth by the catalyst-assisted and self-induced approaches / Caroline Cheze. Gutachter: H. Lüth ; W. T. Masselink ; H. Riechert." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://d-nb.info/1015016790/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Teng, Die. "Computational studies of transition metal nanoclusters on metal-supported graphene moiré." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51830.

Full text
Abstract:
The graphene moiré superstructure formed on Ru(0001) (g/Ru(0001)) has shown the potential as a template to self-assemble super-lattices of metal nanoparticles as model catalysts. To explore the possibility of rational catalyst design on g/Ru(0001), detailed density functional theory (DFT) calculations have been performed to investigate the adsorption and diffusion of Rh and Au adatoms on g/Ru(0001). The consequences of different hopping rates for cluster nucleation have been explored by performing Monte Carlo-based statistical analysis, which suggests that diffusing species other than adatoms need to be taken into account to develop an accurate description of cluster nucleation and growth on this surface. DFT calculations have also been carried out to investigate the adsorption and diffusion of 18 4d (Y-Ag) and 5d (La-Au) transition metal adatoms on g/Ru(0001). Given the necessity to study larger diffusing species than adatoms, DFT calculations have been performed to study the adsorption and diffusion of Rh and Au dimers and trimers on g/Ru(0001). It was shown that the mobility of Rh clusters decreases with the increase of cluster size, while for Au, dimers diffuse faster than monomers and trimers on the moiré surface. We then used a genetic algorithm combined with DFT calculations to predict the lowest energy structure of a Au8 cluster on g/Ru(0001). Our prediction leads us to propose that Au clusters aggregates through Oswald ripening with Au dimer being the major diffusing species. Finally, we examined the morphology of a Cu19 cluster on g/Cu(111) using MD simulations with COMB3 potential. We also studied the mobility of Cu clusters on g/Cu(111) at elevated temperatures. The analysis suggests that g/Cu(111) may not be a suitable substrate for the formation and growth of isolated Cu clusters. All these calculation results have provided us a better understanding and useful insights into the nucleation and growth mechanism of metal clusters on graphene moiré.
APA, Harvard, Vancouver, ISO, and other styles
7

Hoffmeyer, Mark Kenneth. "Nucleation catalysis by dispersed particles." 1985. http://catalog.hathitrust.org/api/volumes/oclc/12570093.html.

Full text
Abstract:
Thesis (M.S.)--University of Wisconsin--Madison, 1985.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 136-142).
APA, Harvard, Vancouver, ISO, and other styles
8

Hoffmeyer, Mark Kenneth. "Heterogeneous nucleation catalysis and grain refinement." 1990. http://catalog.hathitrust.org/api/volumes/oclc/23266270.html.

Full text
Abstract:
Thesis (Ph. D.)--University of Wisconsin--Madison, 1990.
Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 317-325).
APA, Harvard, Vancouver, ISO, and other styles
9

Suárez, Oscar Marcelo. "Heterogeneous nucleation catalysis in Al-Ti-B master alloys." 1993. http://catalog.hathitrust.org/api/volumes/oclc/32553413.html.

Full text
Abstract:
Thesis (M.S.)--University of Wisconsin--Madison, 1993.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 138-143).
APA, Harvard, Vancouver, ISO, and other styles
10

McMurtry, Brandon Makana. "Synthesis and Formation Mechanism of Metal Phosphide and Chalcogenide Nanocrystals." Thesis, 2021. https://doi.org/10.7916/d8-nfgk-at97.

Full text
Abstract:
Semiconductor nanocrystals, or quantum dots, have attracted significant interest for use in solid state lighting, biological imaging, photovoltaics, catalysis, and displays such as televisions or tablets. Quantum dots excel in these applications because of their narrow emission profiles, high absorptivity at high energies, and optoelectronic properties that can be easily tuned using colloidal chemistry. The last point in particular has driven the development of new synthetic methods for producing a range of semiconducting materials on the nanoscale. Academically, interest in the synthesis of quantum dots has also extended to the mechanism of their formation and its implications for the growth of nanoscale crystals more generally. This thesis addresses facets of both points above, first by developing several novel syntheses for indium and gallium phosphide nanocrystals, and second by leveraging the synthetic control it allows to study the mechanisms of homogeneous crystal growth. Chapter 1 provides a brief overview of the colloidal syntheses, optoelectronic properties, and formation mechanisms of quantum dots. Emphasis is placed on the development of new chemical syntheses for nanoscale materials and how the size, size distribution, and morphology can be carefully controlled by thoughtful reaction design. The progression of quantum dot synthesis is presented and specific innovations to the precursor and surfactant design are highlighted. Next, a brief discussion about nanocrystal surface chemistry and its impact on the photophysical properties of the inorganic core is described along with its proposed influence on the kinetics of nanocrystal growth. Finally, classical theories of homogeneous crystal growth are presented and used to explain the origin of the exceptionally narrow size distributions accessible in a wide range of materials. Chapter 2 introduces two novel synthetic pathways to InP nanocrystals. The first describes a small library of substituted aminophosphines that can control the precursor conversion reactivity by over an order of magnitude. Leveraging the collection of aminophosphines, it is demonstrated that at sufficiently high temperatures, the rate of precursor conversion can be used to vary the final nanocrystal size—disputing previous findings for InP nanocrystals. We show that the reactivity of the phosphine is governed by a pre-equilibrium between the precursor and an intermediate (P(NHR)3) that goes on to form InP. Variations to the initial aminophosphine substitution pattern change the position of the pre-equilibrium, thereby allowing the rate of [InP]i deposition to be controlled. The second synthetic method leverages metal phosphonate salts as a surfactant to synthesize large samples of InP. We find that the nanocrystals grow via a ripening mechanism and display excellent crystallinity as determined by powder X-ray diffraction and pair distribution function analysis. Finally, we demonstrate that the final nanocrystals are bound by both phosphonates and phosphines through the use of 31P nuclear magnetic resonance spectroscopy. Chapter 3 expands on the syntheses of InP in the previous chapter by developing methods to form GaP, InxGa1-xP, and InP-based core-shell structures. At the onset, two distinct syntheses of GaP are introduced, one similar to the metal phosphonate route used to form InP, and one that used a mixture of amines to stabilize GaP colloidally. The phosphonate method results in small GaP with somewhat indistinct scattering patterns, while the amine method results in large GaP whose morphology can be varied depending on the solvent selected. Leveraging the newly developed InP and GaP syntheses we demonstrate that InxGa1-xP alloys could be directly synthesized from mixtures of In3+ and Ga3+ salts. We also show that InxGa1-xP can be accessed indirectly via cation exchange of Zn3P2 or Cd3P2, however attempts at synthesizing alloys via cation exchange with phosphonate bound GaP were found to be largely unsuccessful. Finally, the chapter contains initial attempts at synthesizing GaP/InP core-shells with the intention of producing GaP/InP/GaP spherical quantum well architectures. Preliminary data show that InP can be deposited using several different methods, though it remains unclear whether the optical properties will be suitable for integration in solid state lighting applications. Chapter 4 examines the crystal growth processes that precede the formation of monodisperse ensembles of InP, PbS, and PbSe nanocrystals. Surprisingly, we find that nucleation persists for a substantial portion of the total reaction time—a stark departure from the canonical “burst” of nucleation proposed originally by Victor LaMer. We go on to measure the nucleation period for a variety of different reaction conditions and find that the fraction of reaction time nucleation extends over is sensitive to both the material and reaction temperature. This is consistent with a mechanism where faster kinetics of monomer attachment reduce the duration of crystal nucleation—a conclusion that can be surmised by nucleation mass balance models that show a clear material and temperature dependence on the rate of nanocrystal growth. We also interrogate the claim that solute molecules accumulate prior to the formation of mature nanostructures. In situ X-ray experiments clearly corroborate the appearance of solute-like species at early reaction times that build up prior to the appearance of crystals with extended structure. Finally, we propose a novel size-focusing mechanism predicated on a size dependent growth rate. Using population mass balance modeling we show that the measurements of size and size distribution are qualitatively consistent with a growth rate inversely proportional to nanocrystal size.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Nucleation. Catalysis"

1

Tang, Dai-Ming. In Situ Transmission Electron Microscopy Studies of Carbon Nanotube Nucleation Mechanism and Carbon Nanotube-Clamped Metal Atomic Chains. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Tang, Dai-Ming. In Situ Transmission Electron Microscopy Studies of Carbon Nanotube Nucleation Mechanism and Carbon Nanotube-Clamped Metal Atomic Chains. Springer, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tang, Dai-Ming. In Situ Transmission Electron Microscopy Studies of Carbon Nanotube Nucleation Mechanism and Carbon Nanotube-Clamped Metal Atomic Chains. Springer, 2016.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Tang, Dai-Ming. In Situ Transmission Electron Microscopy Studies of Carbon Nanotube Nucleation Mechanism and Carbon Nanotube-Clamped Metal Atomic Chains. Springer, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Nucleation. Catalysis"

1

Glicksman, Martin Eden. "Nucleation Catalysis." In Principles of Solidification, 273–301. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7344-3_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Cubillas, Pablo, and Michael W. Anderson. "Synthesis Mechanism: Crystal Growth and Nucleation." In Zeolites and Catalysis, 1–55. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630295.ch1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

De Cicco, Michael P., John H. Perepezko, Lih-Sheng Turng, and Xiaochun Li. "Nucleation Catalysis Potency of Ceramic Nanoparticles in Aluminum Matrix Nanocomposites." In Supplemental Proceedings, 737–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062142.ch89.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Masson, A. "Peculiar Aspects of Heterogeneous Nucleation and Growth Processes Related to Metal Supported Catalyst." In Contribution of Clusters Physics to Materials Science and Technology, 295–309. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4374-2_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Cheng, Z. X., C. Louis, and M. Che. "Nucleation and particle growth in the preparation of silica-supported nickel catalysts by a two-step procedure." In Small Particles and Inorganic Clusters, 895–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76178-2_216.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Evmiridis, N. P., and Sanyuan Yang. "Synthesis of omega zeolite: effects of nucleation gel." In Studies in Surface Science and Catalysis, 341–48. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81241-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bronić, J., B. Subotić, I. Smit, and L. J. A. Despotović. "Influence of Gel Ageing on Zeolite Nucleation Processes." In Studies in Surface Science and Catalysis, 107–14. Elsevier, 1988. http://dx.doi.org/10.1016/s0167-2991(09)60587-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hou, Liang-Yuan, Leonard B. Sand, and Robert W. Thompson. "Nucleation and Growth of NH4-ZSM-5 Zeolites." In Studies in Surface Science and Catalysis, 239–46. Elsevier, 1986. http://dx.doi.org/10.1016/s0167-2991(09)60879-x.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Pijolat, M., J. P. Viricelle, and M. Soustelle. "Nucleation and growth of ceria from cerium III hydroxycarbonate." In Studies in Surface Science and Catalysis, 885–92. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81831-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Subotic, B., and A. Graovac. "Kinetic Analysis of Autocatalytic Nucleation During Crystallization of Zeolites." In Studies in Surface Science and Catalysis, 199–206. Elsevier, 1985. http://dx.doi.org/10.1016/s0167-2991(08)65284-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Nucleation. Catalysis"

1

Najafabadi, Hamed Abedini, and Nesrin Ozalp. "Effect of Carbon Particle Seeding As Radiant Absorbent for Enhanced Heat Transfer." In ASME 2019 Heat Transfer Summer Conference collocated with the ASME 2019 13th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ht2019-3657.

Full text
Abstract:
Abstract Carbon particles can be used as catalyst in solar reactors where they serve as radiant absorbent and nucleation sites for the heterogeneous decomposition reaction. Unlike commonly used metal catalysts, carbon catalyst does not have durability problem and high cost. However, in order to achieve sustainable catalytic decomposition of feedstock over carbon catalysts at elevated temperatures, the surface area of the carbon particles must be maintained. A subsequent treatment of deactivated carbon samples with CO2 at about 1000°C would increase the surface and would recover the original activity as catalyst. In solar reactor, carbon particles are directly exposed to the high-flux irradiation providing efficient radiation heat transfer directly to the reaction site. Therefore, one of the key parameters to achieve higher conversion efficiencies in solar reactor is the presence and transport of carbon particles. This paper will present impact of carbon use in enhancing the heat transfer inside a solar reactor radiated by a solar simulator. Flux entering the receiver is determined using Monte Carlo ray tracing (MCRT) method which is coupled with energy balance equations to derive numerical model describing dynamic temperature variation in solar receiver. Simulation results indicated that feeding carbon particles results to lower temperatures for the cavity walls and working fluid compare to the case that no carbon is injected. This finding is in accordance with our experimental results obtained from a cylindrical cavity receiver radiated by a 7 kW solar simulator. The results indicated that heat transfer within the system is highly influenced by the particle size. At particle sizes larger than 450 μm, carbon feeding increases the thermal efficiency of the system.
APA, Harvard, Vancouver, ISO, and other styles
2

Zakar, Eugene, Barbara M. Nichols, Stephen Kilpatrick, Gregory Meissner, Richard Fu, and Kevin Hauri. "Nucleation sites for multilayer graphene on nickel catalyst." In 2011 IEEE 11th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2011. http://dx.doi.org/10.1109/nano.2011.6144439.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kuznetsov, V. L. "Nucleation as Self-assembling Step of Carbon Deposit Formation on Metal Catalysts." In MOLECULAR NANOSTRUCTURES: XVII International Winterschool Euroconference on Electronic Properties of Novel Materials. AIP, 2003. http://dx.doi.org/10.1063/1.1627991.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hinebaugh, James, and A. Bazylak. "Dynamic Condensation Modelling in PEMFC GDL." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18268.

Full text
Abstract:
A 2D dynamic pore network model is employed to study the liquid water saturation from condensation originating from a single nucleation site within the gas diffusion layer (GDL) of a polymer electrolyte membrane fuel cell (PEMFC). A complete derivation of the model along with the physical parameters is provided in this paper. Sensitivity analyses are performed to determine how the overall saturation pattern is affected by the following two parameters: condensation rate and nucleation site location. Our results indicate that when considering an initially dry GDL under typical PEMFC operating conditions, fluctuations in condensation rate have little impact on the overall saturation pattern compared to changes in condensation nucleation site location. We observe significant reductions in both overall saturation and local saturation near the catalyst layer as the condensation nucleation site is placed further away from the catalyst layer.
APA, Harvard, Vancouver, ISO, and other styles
5

Robert, C., A. Denoirjean, A. Vardelle, G. X. Wang, and S. Sampath. "Nucleation and Phase Selection in Plasma-Sprayed Alumina: Modeling and Experiment." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0407.

Full text
Abstract:
Abstract This paper presents a one-dimensional heat transfer model which predicts the solidification and cooling of a plasma-sprayed alumina splat after the flattening process is completed. A heterogeneous nucleation process taking place on the substrate surface was assumed. The density and average size of the formed nuclei were determined from the integration of the nucleation rate calculated from the classical kinetic theory for nucleation. This rate depends on the activation energy required for nucleation which takes into account the effect of the surface via a wetting angle between the growing nucleus and the catalytic surface. This contact angle was estimated from the comparison of the computed grain density with the density observed on splat surface using an atomic force microscope. When 67% of the splat surface in contact with the substrate are covered by grains, a planar solidification front was assumed to move through the melt. The theoretical model accounted also for the selection of the crystalline phase. Calculations were performed for various substrate materials at different initial temperatures. Results are expressed in terms of nucleation temperature, nucleation rate, density and grain size distribution.
APA, Harvard, Vancouver, ISO, and other styles
6

Hinebaugh, James, and A. Bazylak. "Condensation Based Pore Network Modelling of Water Transport in Hydrophobic PEM Fuel Cell GDLs." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85179.

Full text
Abstract:
In this work, a novel pore network model is employed to simulate water transport originating from condensation in the polymer electrolyte membrane (PEM) fuel cell gas diffusion layer (GDL). Liquid water transport follows the rules of invasion percolation with trapping, where two mobile phases are considered. Flow conditions are based on dynamic pressure changes in the network. The GDL is assumed to be a hydrophobic pore network, where capillary forces dominate over gravitational and viscous forces. The model follows a condensation based algorithm that begins with a single nucleation site from where liquid water spreads with continuing condensation. To account for a humidity gradient within the GDL, water flow is assumed to originate from condensation occurring in pores facing the cathode catalyst layer. Modelling parameters and their effect on the saturation profile are discussed. Little impact was found on the saturation profile when trapping logic was made more sophisticated, recognizing conditions leading to air trapping in a single throat. It is shown that saturation profiles for slow flow (i.e. slow condensation rates) can be predicted with reasonable accuracy from a known throat topology alone. However, as condensation rates are increased, raising network viscous forces to levels comparable to network capillary forces, the flow patterns begin to depend on a number of variables such as pore sizes and pore filling rates. At such condensation rates, flow patterns show high sensitivity to variance in condensation rates and become much less predictable from simple geometries.
APA, Harvard, Vancouver, ISO, and other styles
7

Davis, Benjamin, Nitin Muralidharan, Cary Pint, and Matthew R. Maschmann. "Electrically Addressable Hierarchical Carbon Nanotube Forests." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67226.

Full text
Abstract:
Hierarchical, branched carbon nanotube (CNT) forest assemblies were created by synthesizing a second generation of CNTs directly from the alumina-coated surface of a parent CNT forest. First, a parent CNT forest generation was synthesized using floating catalyst chemical vapor deposition (CVD) in which gaseous argon and hydrogen are flowed into a tube furnace, along with a controlled flow rate of ferrocene nanoparticles suspended in xylene solvent. Next, a thin alumina coating was applied to the parent CNT forest using atomic layer deposition (ALD). The ALD process pulses alternating gases of water vapor and trimethylaluminum (TMA) and is repeated for 100 cycles, yielding a 10nm coating. This coating adheres to the outer walls of the larger CNTs and serves as a supportive surface to enable the growth of a second CNT generation. Finally, a second CNT generation was synthesized from the parent CNT forest using a floating-catalyst CVD method similar to that used for the parent generation. The relatively low areal density of the parent CNT generation allows for gas-phase additive processing (i.e. ALD and floating catalyst CVD) to occur deep within the volume of the original parent CNT forest. Transmission electron microscopy analysis of the hierarchical CNT forests shows that second-generation CNTs nucleate and grow from the alumina-coated walls of the parent generation rather than nucleating from the original growth substrate, as has been previously reported. Further, physical confinement of the second-generation catalyst particle on the external surface of the parent generation CNTs (28 nm average diameter) leads to small-diameter CNTs (8 nm average) for the second generation. Further, radial breathing modes are detected by Raman spectroscopy, indicating single-walled or few-walled CNTs are synthesized in the second generation. The hierarchical forests exhibit many desirable properties compared to single generation forests. Because the second generation CNTs within the interstitial regions of the parent CNT forest, they increase the structural rigidity of the cellular CNT forest morphology, increasing in mechanical stiffness by ten-fold, relative to the parent CNT forest. Further, we demonstrate that electrical continuity between the CNT generations is retained. Because a thin alumina buffer layer exists between CNT generations, electrical continuity is not guaranteed. Cyclic voltammetry and electrochemical impedance spectroscopy are used to characterize the electrical resistance elements within the hierarchical forest. This hierarchical structure offers a new avenue to tailor the performance of CNT forests and offers performance enhancements for applications in thermal interfaces, electrical interconnects, dry adhesives and energy generation and storage.
APA, Harvard, Vancouver, ISO, and other styles
8

Williams, Aaron, Jonathan Burton, Earl Christensen, Robert L. McCormick, and John Tester. "Emissions From Various Biodiesel Sources Compared to a Range of Diesel Fuels in DPF Equipped Diesel Engines." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60106.

Full text
Abstract:
The purpose of this study was to measure the impact of various sources of petroleum-based and bio-based diesel fuels on regulated emissions and fuel economy in diesel particulate filter (DPF) equipped diesel engines. Two model year 2008 diesel engines were tested with nine fuels including a certification ultra-low sulfur diesel (ULSD), local ULSD, high aromatic ULSD, low aromatic ULSD, and twenty percent blends of biodiesel derived from algae, camelina, soy, tallow, and yellow grease. Regulated emissions were measured over the heavy duty diesel transient test cycle. Measurements were also made of DPF-out particle size distribution and total particle count from a 13-mode steady state test using a fast mobility particle sizer. Test engines were a 2008 Cummins ISB and a 2008 International Maxx Force 10, both equipped with actively regenerated DPFs. Fuel consumption was roughly 2% greater over the transient test cycle for the B20 blends versus certification ULSD in both engines, consistent with the slightly lower energy content of biodiesel. Unlike studies conducted on older model engines, these engines equipped with diesel oxidation catalysts and DPFs showed small or no measurable fuel effect on the tailpipe emissions of total hydrocarbons (THC), carbon monoxide (CO) and particulate matter (PM). No differences in particle size distribution or total particle count were seen in a comparison of certification ULSD and B20 soy, with the exception of engine idling conditions where B20 produced a small reduction in the number of nucleation mode particles. In the Cummins engine, B20 prepared from algae, camelina, soy, and tallow resulted in an approximately 2.5% increase in nitrogen oxides (NOx) compared to the base fuel. The International engine demonstrated a higher degree of variability for NOx emissions, and fuel effects could not be resolved (p > 0.05). The group of petroleum diesel test fuels produced a range of NOx emissions very similar to that caused by blending of biodiesel. Test cycles where an active regeneration of the DPF occurred resulted in a nearly threefold increase in NOx emissions and a 15% increase in fuel consumption. The full quantification of DPF regeneration events further complicates the accurate calculation of fuel impacts on emissions and fuel consumption.
APA, Harvard, Vancouver, ISO, and other styles
9

Mayer, A., J. Czerwinski, and M. Kasper. "Nanosize Metal Oxide Particle Emissions From Diesel- and Petrol-Engines." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60045.

Full text
Abstract:
All internal combustion piston engines emit nanoparticles. Part of them are soot particles as a results of incomplete combustion of fuels, or lube oil. Another part are metal particles, most probably oxides, commonly called ash. A major source of metal particles is engine wear and corrosion. The lube oil reentraines these abraded particles into the combustion zone. There they are partially vaporized and ultrafine oxide particles formed through nucleation [1]. Other sources are metallic additives to the lube oil, or the fuel, and debris from the catalytic coatings in the exhaust-gas after-treatment. The formation process results in extremely fine particles, typically smaller than 50 nm. Thus they can intrude through the alveolar membranes directly into the human organism and can even penetrate the cell nucleus [5]. The consequent health risk necessitates a careful investigation of these emissions and effective curtailment. Substantial information is available on Diesel engine particulate emissions, [2, 3, 4] but there are almost no results for SI engines reported. Beside an example of metal oxide particles from a Diesel engine, [2], the present paper shows some preliminary results of particle mass and nanoparticle emissions of SI engines. Four SI engines were investigated: two older and two newer engines, comprising two car engines and two motorbikes. The tests were done on standard transient driving cycles, and steady-state at constant 50 km/h and idling because prior to this study high concentrations of ash were observed with Diesels during idling, [2]. All tests were done with particle samples collected from the CVS tunnel, during long operating periods, to have sufficient material for analyzing. At the steady-state points, the particle size spectra were measured and based on this the source as “ash” postulated. The results show that the older engines emit high concentrations of both soot and ash particles. The size distribution is bimodal for soot and ash particles. The newer engines’ emission results are less uniform and the concentrations are lower, as expected. Altogether, the concentrations of these ash particles in the exhaust gas of Diesel and SI-engines can be so high, that more detailed investigations are requiredy.
APA, Harvard, Vancouver, ISO, and other styles
10

Littera, D., M. Velardi, A. Cozzolini, G. Yoder, M. C. Besch, D. K. Carder, and M. Gautam. "Integrated Physical and Chemical Measurements of PM Emissions of Dispersing Plume Heavy-Duty Diesel Truck: Wind Tunnel Studies: Part I — Design and Commissioning." In ASME 2012 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icef2012-92091.

Full text
Abstract:
Over the past few decades there has been considerable progress made in understanding the processes leading to formation and evolution of particulate matter (PM) emissions from heavy duty diesel engines (HDDE). This progress has been primarily made under controlled laboratory conditions with the use of constant volume sampling (CVS) systems and to a limited extend through on-road chase studies. West Virginia University (WVU) is attempting to close the present knowledge gap by conducting detailed experiments in a custom designed and constructed environmental wind tunnel. The understanding and knowledge has recently been further extended to new emission reduction technologies, such as the diesel particulate filter (DPF) which has dramatically changed the size distribution and chemical composition of PM. Additionally, the selective catalytic reduction (SCR) technology has shown to further enhance the formation of nucleation mode particles as well as alter their morphology. Even with advances in technology there remains a considerable gap in the current level of understanding of PM formation and evolution, since the combustion generated PM from diesel engines is not discernible from the atmospheric background PM measured beyond 300m from highways. After being emitted from the vehicle exhaust system, the process of dilution in the atmosphere leads to a multitude of PM transformation phenomena, such as volatilization, coagulation, and condensation. The work presented herein has been divided into two parts which are published separately from each another. The first part describes the design and commissioning process of the wind tunnel focusing on both, aerodynamic and structural constraints, which ultimately led to the definition of the main characteristics of the facility. The resulting design is a subsonic, non-recirculating, suction type tunnel, with a 16ft high and 16ft wide test section capable of housing a full-size heavy-duty tractor cab. A 2,200hp suction fan is employed to provide up to 80 mph wind speeds. The 115ft test cell length guarantees for a 2 second residence time for the exhaust plume evolution (at 35 mph) and complies with turbulence intensity (less than 1%) and quality flow requirement as identified for this type of application. In addition, the West Virginia University (WVU) wind tunnel has been equipped with a custom made sampling system able to move in all three dimensions in order to measure spatially resolved plume characteristics. The second part will describe the actual test procedures and the experimental results and will be published in a separate paper.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Nucleation. Catalysis' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography