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Showing 1 to 20 of 44 for “"Ostwald"”.
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Adatom Emission From Nanoparticles: Implications for Ostwald Ripening
To achieve clean air in our cities, all modern means of ground transportation make use of catalytic converters. Precious metal-based catalysts such as Pt and Pd are currently used in catalytic converters. To achieve higher fuel efficiency, combustion can be carried out in excess air resulting in a …
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Evolução de bolhas de ar em misturas de glicerol/água pelo amadurecimento de Ostwald
O amadurecimento de Ostwald é um processo de crescimento controlado por difusão onde partículas maiores crescem em detrimento da diminuição, e eventualmente do desaparecimento, de partículas menores. Nesse processo ocorre o aumento do raio médio e a diminuição do número total de partículas. A …
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On the solution of external laminar free convection to power law fluids
… Equation (1.1) is also called the power model of Ostwald-de Waele-Nutting (1), or simply the Ostwald power model. It applies only to one-dimensional, incompressible flow in which is much larger than all the other elements instrain rate tensor. It should also be noted that all power law fluids have …
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Nucleation Control in Size and Dispersity in Metallic Nanoparticles: The Prominent Role of Particle Aggregation
… active-growth regime extends to 58 min, and that Ostwald ripening ensues shortly thereafter. Evidence for an aggregative nucleation and growth process is obtained. The quantitative data indicate that classical nucleation and growth, aggregative nucleation and growth, and Ostwald ripening occur in …
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Structure and Phase Transformation of Nanocrystalline and Amorphous Alloy Thin Films
… phenomenon can be explained by grain growth and Ostwald ripening in which big clusters grows bigger at the expense of smaller clusters. The Ag clusters remain relatively stable under annealing; HREM images show crystalline structure at 500°C, which is different from Ag clusters supported on …
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The rheology of silicon nanoparticle inks fro screen printing electronic devices
… with the more dilute inks showing a power law (Ostwald / de Waele model) behaviour dependence of complex viscosity on angular frequency. The flow behaviour of the inks was also seen to follow a Windhab model. The printability of the inks primarily depends on the shear-dependent viscosity as …
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Model electrode structures for studies of electrocatalyst degradation
… to occur by four mechanisms; particle sintering (Ostwald ripening and migration and coalescence), carbon corrosion and catalyst dissolution. Increasing catalyst layer durability is becoming a major challenge and a growing focus of research attention in PEM fuel cell durability studies. Typical …
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The plastic deformation of alloys based on aluminum titanide
… has been developed which describes accelerated Ostwald ripening at moving interfaces. Isothermal and isochronal annealing experiments have been executed on rapidly solidified materials with results which are consistent with the presented predictions.
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Formulación y caracterización de emulsiones de de limoneno estabilizadas por un tensioactivo polimérico
… inhibe el crecimiento del tamaño de gota por Ostwald ripening obteniéndose un sistema coloidal altamente estable. Esta tesis está formada por cinco capítulos. El primer capítulo introduce los principales concepto de la ciencia y tecnología de emulsiones así como el estado del arte de los …
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Layered Double Hydroxides: Morphology, Interlayer Anion, and the Origins of Life
… morphological issues using techniques such as Ostwald ripening and precipitation via aluminate. Another interesting issue in layered double hydroxide materials is the uptake and orientation of anions into the interlayer. Questions about iron cyanide interlayer anions have been posed. Fourier …
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An information theoretic approach to EEG-fMRI integration
The integration of signals from electro-encephalography (EEG) and functional magnetic resonance imaging (fMRI), acquired simultaneously from the same observer, holds great potential for the elucidation of the neurobiological underpinnings of human brain function. However, the most appropriate way …
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Developing a New Mechanical Model for Swarm Development in Myxococcus xanthus & Establishing a Genotype-to-Phenotype Correlation Between Swarm Pattern Formation and Gene Homology
… work, we demonstrate that equations describing Ostwald ripening within a thin liquid film were able to predict aggregate behavior with high accuracy. Consistent with this theory, both relative aggregate size and the distance between aggregates influence the likelihood that a given aggregate will …
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Desenvolvimento de sucos mistos de frutas tropicais adicionados de luteína e epigalocatequina galato
… mistos podem ser descritos pelos três modelos (Ostwald-de- Waele, Casson e Herschel-Bulkley); o modelo de Ostwald-de-Waele descreve de forma mais adequada o comportamento reológico, destes produtos; os valores dos índices de comportamento do escoamento (n e nH) foram menores que a unidade, …
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Tonmineral-Neubildung und Paläosalinität im Unteren Muschelkalk des südlichen Germanischen Beckens
… ein spezifisches Korngrößenwachstum durch Ostwald-Reifung. Im Verlauf dieses selektiven Lösungs-Fällungsprozesses wird in einem geschlossenen Reaktionssystem durch Verminderung der freien Grenzflächenenergie ein energetisch günstigerer Zustand angestrebt. Da während des Reifungsprozesses …
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Pyrite porphyroblast paragenesis at the Cherokee Mine, Ducktown, Tennessee
… the formation of the larger porphyroblasts by Ostwald ripening, and by the annealing of small pyrite grains into larger porphyroblasts, during isochemical metamorphism. Sphalerite geobarometry indicates initial growth of the pyrite porphyroblasts began at 6.8± 0.8 kilobars and that many …
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Investigations of carbon nanotube catalyst morphology and behavior with transmission electron microscopy
… particle used in common CNT growth procedures. Ostwald ripening studies on iron nanoparticles are performed in an attempt to link catalyst morphology during growth and CNT chirality (the structure aspect of a nanotube that determines its electrical properties). These results suggest that inert …
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Clay mineral catalysed oxidation of phenols
… probably, their higher degree of defects as full Ostwald ripening has not yet occurred. Substituted phenols appear to be degraded very rapidly. However, further work needs to be done in this area to ascertain the effect that substituents have on the rate of reaction.
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A variable temperature scanning tunneling microscopy study of organizing C60 molecules on nanostructured gold surface
… over a long timescale. A combination of Ostwald ripening and Smoluchowski ripening process is observed.
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Formulación, procesado y caracterización física y de emulsiones con mezclas de disolventes verdes
… coalescencia, la floculación o la maduración de Ostwald. Es de vital importancia detectar estos fenómenos en una fase temprana para mejorar la estabilidad de las emulsiones y para optimizar el desarrollo de formulaciones. Entre las propiedades físicas de las emulsiones, la reología es, desde un …
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