Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"nucleation mechanism"”.
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Nucleation mechanism of crystal formation during antisolvent or cooling induced crystallisation
This project studied the nucleation mechanism of crystal formation during antisolvent or cooling crystallisation of simple amino acids: D,L-valine and glycine. These amino acids can co-precipitate with proteins to form Protein Coated Microcrystals (PCMCs) in which the crystals create a solid …
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Investigation of Fine-scaled Alpha Precipitation in the Modeled Ti-Mo and Ti-Mo-Al Alloys
… promote the activation of various non-classical nucleation mechanisms, specially pseudospinodal decomposition mechanism and ω-assisted ⍺ nucleation mechanism, via carefully designing various heat-treatment conditions in the binary Ti-Mo and ternary Ti-Mo-Al alloys. We concentrate on the binary …
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Templated Multiferroic Nanocomposites by Ion-Lithography
… are integrated with garnet Y3Fe5O12. Growth mechanism, structure characterization and magnetic properties of as-grown films are discussed. Second, ion-lithography enabled by the VELION FIB-SEM system is developed to template the perovskite—spinel system. Specifically, fin-shaped BFO—CFO …
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Investigating the Effect of Austenite Grain Size and Grain Boundary Character on Deformation Twinning Behavior in A High-Manganese TWIP Steel: A TEM In-Situ Deformation Study
… trade-off but their underlying mechanism of discontinuous yielding behavior has not been well understood. In this study, our systematic TEM characterization suggests that the plastic deformation mechanisms in the early stage of deformation, around the macroscopic yield point, …
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Reguläre bakterielle Zellhüllenproteine als biomolekulares Templat
… on the biomolecular template. A heterogeneous nucleation mechanism is proposed for this process consisting of the binding of metal complexes and their subsequent reduction. The kinetics of the process and the binding of the complexes to the protein are characterized by UV/VIS spectroscopy. This …
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Nucleation in emulsion polymerization : steps towards a non-micellar nucleation theory
For more than 70 years, 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 …
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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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A detailed, stochastic population balance model for twin-screw wet granulation
… particle method. A number of new particle mechanisms are introduced and existing mechanisms augmented including immersion nucleation, coagulation, breakage, consolidation, liquid penetration, primary particle layering and transport. The model’s predictive power is assessed over a range of …
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Distributional fixed point equation model of island nucleation processes during submonolayer deposition
… finding an analytical model for the submonolayer nucleation processes on a substrate. More specically, we explore the Distributional Fixed Point Equation (DFPE) approach of modelling the size distribution of the gaps between nucleated islands (GSD) on a one dimensional substrate, and the size …
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Theoretical Insights into Heterogeneous Metallic Catalysts for Biomass Based Hydrogen Production
… A QM/MM approach was used for studying the nucleation mechanism of selected Pd clusters onto a boron nitride nanotube (BNNT) support and the information gained were exploited for the reactivity study. In this framework, the competi- tion between the formate (HCOO) and carboxyl (COOH) FA …
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Formation of RDX nanoparticles by rapid expansion of supercritical solution : in situ characterization by laser scattering
… of the fundamentals of the RESS process and the mechanism of nanoparticle formation via an in situ particle monitoring and characterization in the RESS jet combined with the characterization of the final product. In this research, nanoparticles of RDX generated by RESS using supercritical CO_2 …
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Investigating the role of curvature on the formation and thermal transformations of soot
… hydrocarbons (cPAH) on the initial formation mechanism and thermal transformations of soot was explored. Experimental and computational techniques were used to probe the integration, presence and impact of internal pentagonal rings on the nucleation mechanism of these particulates. A …
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Probing Nucleation Mechanisms of Gas Hydrates via Molecular Simulations
… a fundamental molecular-level understanding of nucleation behavior and mechanisms is necessary to support ongoing developments associated with gas hydrates. With the primary goal to provide significant insights into the mechanistic details of gas hydrate formation at the molecular level, this …
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Fundamental studies on ionomer glasses
… separation, probably by a spinodal decomposition mechanism, followed by a two stage crystallization of calcium fluoride (fluorite) and anorthite. The anorthite phase crystallized from fluorite nuclei and, in effect, crystallization occurred by a bulk nucleation mechanism. The glass will also …
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Kinetic and structural evolution of functional peptide assembling networks
The peptide assembly mechanism is important for the development of both functional biomaterials and clinical therapies. Although the assembly structures and assembling pathways have been studied for decades, the complex multistep mechanism remains to be clarified. The main goal of this thesis is to …
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Angle-resolved photoemission and first-principles studies of topological thin films
… thickness range can be attributed to a surface nucleation mechanism. Finally, we have studied the electronic structure of the Bi/Ag surface alloy, a system possessing a huge Rashba splitting in its surface bands. The Bi/Ag surface alloy is prepared by depositing Bi onto ultrathin Ag films …
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Crystal growth and nucleation kinetics of diethylenetriammonium hexachlororhodate (III) salt
… The objective of this work is to determine nucleation and growth kinetics of diethylenetriammonium hexachlororhodate (III) salt. Two reactor configurations, namely a transient continuous stirred tank reactor (CSTR) and a t-mixer plug flow reactor (PFR), were used to determine nucleation and …
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Development of Thermoplastic Elastomers with Improved Elastic Properties Based on Semicrystalline Block Copolymers
… scanning calorimetry and special self-nucleation (SN) techniques reveals a strong influence of the confinement active during crystallization on the crystallization and SN behavior of the semicrystalline PEO and PE blocks. For low PEO contents large supercoolings are necessary to induce …
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Fabrication, Kinetics and Crystallography of Lithium Disilicate Glass-Ceramics
… The second objective is to understand the nucleation mechanism and crystallization kinetics of lithium disilicate glasses by in situ and real-time observations of phase transition using X-ray diffraction (XRD) technique with the state-of-the-art synchrotron radiation. In the meantime, it is …