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Showing 1 to 20 of 51 for “"nucleation theory"”.
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Nucleation theory using equations of state
… with the accuracy of theories of vapor-to-liquid nucleation based on equations of state of real fluids."--Introduction, page 1.
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Nucleation in emulsion polymerization : steps towards a non-micellar nucleation theory
… understanding of the mechanism of particle nucleation in emulsion polymerization has been one of the most challenging issues in heterophase polymerization research. Within this work a comprehensive experimental study of particle nucleation in emulsion polymerization of styrene at 70 °C and …
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Studies of Thin Film Nucleation Kinetics (Island Growth)
Thin film nucleation theory for the island growth model has long been a subject of intensive study because understanding of the nucleation mechanisms should improve the attainable film morphologies. In spite of the long history of nucleation theory, the current status of the theory is not able to …
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Re-evaporation nuclei and evaporation in a Wilson cloud chamber
… effect.</p> <p>The theories of evaporation and nucleation on submicroscopic drop residues were re-examined, and alterations which appear to be consistent with the results of this work were incorporated into the evaporation theory.</p> <p>The observed continually decreasing evaporation rate with …
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A further study of the incubation period of the age-hardening of aluminum-copper alloys
Turnbull’s transient nucleation theory, when applied to the transformation that takes place when high purity aluminum-copper alloys are quenched directly to the aging temperature, explains the incubation period that precedes steady state nucleation. This incubation period arises from the …
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The role of heterogeneity in long-range interacting systems : from nucleation to earthquake fault systems
… method to determine the time and place of nucleation and extend its use as an indicator for spinodal nucleation. The heterogeneous Ising model with fixed magnetic sites will then be reformulated as a dilute random field Ising model. This reformulation will allow for the application of …
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Condensation and sublimation of carbon dioxide and water molecules at cryogenic temperatures
… The results are explained using heterogeneous nucleation theory for low density population, and a new approach for high density population is presented. The rate of sublimation of these two gases was measured directly. The results are reported in terms of vapor pressure in the range 10⁻⁹ to …
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Molecular simulation study of homogeneous crystal nucleation in n-alkane melts
… (MC) method to study the homogeneous crystal nucleation in the melts of n-alkanes, the simplest class of chain molecules. Three n-alkanes with progressive chain length were studied, n-octane (C8), n-eicosane (C20), and C150, using a united atom force field, which is able to reproduce physical …
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Engineering Gold Nanoparticles And Their Use To Control Nucleation
… charge transfer salt based on the seed mediated nucleation method. AuNP seeds are prepared on highly ordered pyrolytic graphite (HOPG) substrate by the electrocrystallization method. An aqueous solution of 0.05 to 1 mM Hydrogen tetrachloroaurate (HAuCl4) with 0.1 mM (Potassium chloride) KCl as …
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Theory of nucleation of water properties of some clathrate like cluster structures
"The tranquility of classical homogeneous nucleation theory has been disturbed by the introduction of statistical mechanical correction factors to a basically thermodynamic theory. These factors, which appear to be essential, destroy much of the agreement with experiment in the case of water vapor. …
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Three-dimensional defect characterization : focused ion beam tomography applied to tin sulfide thin films
… pore volumes. To explain the results, we employ nucleation theory and develop two different models: (a) a thermodynamic model that assumes pores form primarily from an effect known as "self-shadowing," whereby growth-rate anisotropy results in some grains that grow faster than their neighbors, …
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Nucleation Dynamics for Water Condensation on Hydrophobic Surfaces in the Presence of Non-Condensable Gases
The density and rate of nucleation (here-in called nucleation density rate) significantly influences the heat transfer performance during dropwise condensation, as more than 70% of the total heat transfer happen for droplets smaller than 10 μm. Based on the classical nucleation theory, …
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Molecular dynamics modeling of orientation-induced nucleation in short alkanes : toward molecular modeling of flow-induced crystallization in polymers
The enhancement of the primary flow-induced nucleation rate in short chain alkanes (C20 and C150) has been examined for different levels of orientation by atomistic molecular dynamics simulations. The nucleation rate has been found to change drastically by varying average molecular orientation and …
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Gypsum scale formation on a heated copper plate under natural convection conditions and produced water remediation technologies review
… at a supersaturation index of 2.0. The classical nucleation theory of Mullin provides an excellent fit for the results. Interfacial energies calculated out of this model are in the reported ranges.
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Crystallization and melting behavior of (ε-caprolactone)-based homopolymer and triblock copolymer
… of the Lauritzen-Hoflinan (LH) surface nucleation theory to the crystallization kinetics of poly(ε-caprolactone), PCL. This theory has successfully predicted a number of experimental observations such as the temperature dependence of spherulitic growth rates and the inverse relation …
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An investigation of the dynamics of phase transitions in Lennard-Jones fluids
… problem is, according to (the exact) continuum theory, parabolic. Given the heat addition rate, estimates for the value of the thermal conductivity can be obtained from the curvature of the temperature profile. The estimates for the thermal conductivity are compared to experimental data for the …
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Kinetics of Nesquehonite Nucleation
<p>During the nucleation of mineral crystals, the particles (atoms and molecules) will be ordered in a crystal lattice and mineral surfaces will develop. The interfacial energy plays important roles in mineral nucleation. The surface energy can be influenced by many factors including temperature, …
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Atom-Based Computer Simulation Studies of Gas-to-Liquid Nucleation in Atmospherically Relevant Systems: Clarifying Discrepancies and Elucidating Mechanisms
For over a century, nucleation for all systems was thought simplistically to be a process that advances through the formation of critical clusters with a well-defined composition. Our results show intriguing nucleation mechanisms that challenge the aforementioned notion. We employed the simple …
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Alloy Design for a Fusion Power Plant
… have also been made. In addition, a classical nucleation theory approach was taken to modelling the incubation and nucleation of irradiation-induced voids in these steels, with a view to minimising this undesirable phenomenon in candidate materials. Using these models, recommendations are made …
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Mechanisms of Cell Nucleation, Growth, and Coarsening in Plastic Foaming: Theory, Simulation, and Experiment
… highlights a comprehensive research for the cell nucleation, growth and coarsening mechanisms during plastic foaming processes. Enforced environmental regulations have forced the plastic foam industry to adopt alternative blowing agents (e.g., carbon dioxide, nitrogen, argon and helium). …
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