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The Effect Of Adsorbed Volatile Organic Compounds On An Ultrathin Water Film Measurement, Shahab Bayani Ahangar, Chan Ho Jeong, Fei Long, Jeffrey S. Allen, Seong Hyuk Lee, Chang Kyoung Choi
The Effect Of Adsorbed Volatile Organic Compounds On An Ultrathin Water Film Measurement, Shahab Bayani Ahangar, Chan Ho Jeong, Fei Long, Jeffrey S. Allen, Seong Hyuk Lee, Chang Kyoung Choi
Michigan Tech Publications
Using surface plasmon resonance imaging (SPRi), we have recently shown for the first time the existence of a monolayer water film between droplets during dropwise condensation. This study examines the effect of adsorbed volatile organic compounds (VOCs) on the ultrathin film measurement using SPRi. Further, the work presents the proper surface-treatment process that enables measurements of the ultrathin water layer during high-speed imaging of dropwise condensation at 3000 frame per second. In this study, two methods were applied for cleaning the surface (gold-coated glass)-(1) standard cleaning procedure (SCP) using acetone, isopropyl alcohol, and deionized water and (2) SCP followed by …
Submonolayer Nucleation In Ultrathin Liquid Films: Scaling Properties And The Effects Of The Critical Nucleus Size, Haley Doran
Submonolayer Nucleation In Ultrathin Liquid Films: Scaling Properties And The Effects Of The Critical Nucleus Size, Haley Doran
Scholars Week
Scaling phenomena during submonolayer thin-film formation and growth has been a subject of interest for several decades, motivated in part by its relevance to understanding deposition and growth of technologically-important electrode and semiconductor materials. There are several models that effectively describe various scaling behaviors in regimes where the critical island size i* is very small (typically i* < 4 monomers). These models capture many essential properties of of submonolayer nucleation and growth in vacuum-deposited films quite well, however systems with large i* values such as those that occur during solution-phase nucleation remain unexplored due to the high computational cost of traditional approaches. Such systems are of particular interest for the fundamental understanding of the physics behind the growth of large, low-defect organic crystals via organic-vapor-liquid-solid deposition, which have novel semiconductor applications. Here we discuss a multiscale model that combines traditional mean field and classical nucleation theory approaches with a self-consistent treatment of i*, stochastic treatment of nucleation, and analytically calculated monomer diffusion via the 2D diffusion equation. This approach allows us to model large i* systems and compare scaling patterns to those of small i* systems.
Influence Of Separator Surface Charge On The Nucleation And Penetration Dynamics Of Metal Electrodes In Concentrated Electrolytes, Sikuang Wang
McKelvey School of Engineering Theses & Dissertations
No abstract provided.
Studies Of Maximum Supercooling And Stirring In Levitated Liquid Metallic Alloys, Mark Edward Sellers
Studies Of Maximum Supercooling And Stirring In Levitated Liquid Metallic Alloys, Mark Edward Sellers
Arts & Sciences Electronic Theses and Dissertations
Nucleation—or the formation of some cluster in a medium undergoing a phase transition—is usually the initial step in a phase transition. However, this process is still not fully understood, as outstanding questions related to the role of structure, local order, and diffusion remain unanswered. Systematic supercooling studies on metallic liquids performed using electrostatic and electromagnetic (ESL and EML, respectively) will be presented and discussed within the context of several nucleation theories, such as the Classical Nucleation Theory, Diffuse Interface Theory, and Coupled-Flux theory. To study the role of diffusion on nucleation, studies on the International Space Station using the on-board …
Thermophysical Properties And Phase Transformations In Metallic Liquids And Silicate Glasses, Daniel Christian Van Hoesen
Thermophysical Properties And Phase Transformations In Metallic Liquids And Silicate Glasses, Daniel Christian Van Hoesen
Arts & Sciences Electronic Theses and Dissertations
The first quantitative measurements of the electrical resistivity in binary metallic liquids, used to probe local order in the liquid, are reported in this dissertation. The electrical resistivity is very sensitive to short and medium range ordering because the electron mean free path is approximately the same length scale as the atomic spacing. Particular attention is given to the resistivity value at a crossover temperature that, based on molecular dynamics (MD) simulations, is the onset of cooperative motion in liquid alloys. Experimental evidence for the crossover is found in measurements of the shear viscosity, a dynamical property. An indication of …
Investigating Heterogeneous Nucleation Of Barite Using Hydrothermal Atomic Force Microscopy And Optical Microscopy, Ankita B. Gurav
Investigating Heterogeneous Nucleation Of Barite Using Hydrothermal Atomic Force Microscopy And Optical Microscopy, Ankita B. Gurav
Browse all Theses and Dissertations
In order to develop a better understanding heterogeneous nucleation of barite, barite precipitation was studied under varying experimental parameters. Hydrothermal atomic force microscopy (HAFM) and optical microscopy were used to investigate the effect of change in temperature, supersaturation and varying ratios of ions on heterogeneous nucleation of barite. In the experiments conducted at higher temperatures, the particles thus nucleated were found to display characteristic hexagonal and rhomboidal shapes. In comparing results of particle densities among different ion ratios, there is evidence suggesting that barium to sulfate ratio plays a role of promoter. Wherein, the ratios with higher [Ba2+] concentration were …
Nucleation Under Non-Equilibrium Conditions, Dasith Deshan Dodangoda Liyanage
Nucleation Under Non-Equilibrium Conditions, Dasith Deshan Dodangoda Liyanage
University of Wollongong Thesis Collection 2017+
Steel of peritectic composition is widely used globally in construction, automobile and energy generation, to name just a few, with production by continuous casting techniques, exceeding 1.3 billion t/a. However, production rates and quality in steel of near-peritectic composition are hampered by the occurrence of surface cracks. The root cause of these defects has been attributed to the occurrence of a massive-type of phase transition followed by a sudden volume contraction in the meniscus region of a continuous caster. This sudden volume contraction leads to detachment of the thin solidifying shell from the mould, which leads to cracks and in …