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 20 of 52 for “"Surface energies"”.
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Introduction of the reduced surface energies at zero absolute temperature.
Thesis. 1977. B.S.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Investigation to Identify the Influence of Mannitol as a Carrier on the Ex-Vivo Dose Emission and the In-Vitro Aerodynamic Dose Emission Characteristics of Dry Powder Inhalers of Budesonide
… rates. Aerodynamic characteristics, flow and surface energies were investigated together with in vitro and ex vivo assessment of drug deposition. Dose emission was greater for all formulations with higher inhalation flow, indicating greater detachment of drug from carrier, and greater with the …
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The Effect of Work of Adhesion on Contact of a Pressurized Blister With a Flat Surface
The ability to accurately measure surface and interfacial energies affects our understanding of friction, wear, bonding and adhesion. Although there are accurate ways to measure the surface energies of liquids, the surface energies of solids have been harder to characterize. In order to broaden the …
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The Effect of Adhesion on the Contact of an Elastica with a Rigid Surface
… bonds is dependent on the ability to measure surface and interfacial energies. The surface energies of liquids may be measured accurately using a variety of techniques; however, surface energies of solids are much more difficult to accurately measure. In an attempt to develop a method that can …
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First-Principles Study of Metal -Ceramic Interfaces
… reveal a trend in Wad with respect to the summed surface energies of the interfaced materials (sigmaAl + sigmaceramic). Specifically, we find that surfaces having larger sigma's adhere at interfaces more strongly than those with small sigma's. We argue that this behavior is consistent with the …
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Atomistic Modeling of Defect Energetics and Kinetics at Interfaces and Surfaces in Metals and Alloys
Planar defects such as free surfaces and grain boundaries in metals and alloys play important roles affecting many material properties such as fracture toughness, corrosion resistance, wetting, and catalysis. Their interactions with point defects and solute elements also play critical roles on …
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Defect Structures in Ordered Intermetallics; Grain Boundaries and Surfaces in FeAl, NiAl, CoAl and TiAl
… by undertaking a systematic study of the energies and structures of specific grain boundaries in some of these compounds. The relaxed atomistic grain boundary structures in B2 aluminides, FeAl, NiAl and CoAl and <I>L</I>1₀ γ-TiAl were investigated using molecular statics and embedded atom …
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Thermodynamic properties of intermetallics
… (α - Al2O3) and iron. Further, the Al2O3 surface energies of various planes were investigated. In addition, interfaces, which are of experimental interest within CRC 920, were modelled: α - Al2O3 (0001) || Al(111), TiO2 (rutile) || MgTiO3 (geikielite) and α - Al2O3 (corundum).
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First-principles modeling of thermal stability and morphology control of cathode materials in Li-ion batteries
… contributions to the error in GGA oxidation energies are identified. The first contribution originates from the overbinding of GGA in the O₂ molecule and is only present when the oxidant is O₂. The second error occurs in all oxidation reactions and is related to the correlation error in 3d …
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A fundamental study of the sticking of insect residues to aircraft wings
… The present research studied the effects of surface energy and surface roughness on the phenomenon of insect sticking. Aluminum plates of different roughnesses were coated with thin films of polymers with varying surface energies. The coated plates were attached to a custom jig and mounted on …
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Decorating Crystallites with Atoms and Small Molecules: A First-Principles Investigation
… gases and small probe molecules onto crystalline surfaces epitomizes physisorption. Due to its intricate nature, a delineation of the physical adsorption phenomenon is necessitated. This has led to an immense number of studies centralized on the basis of adsorption. The physical adsorption onto …
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The Effects of Molecular Architecture on the Rheological and Mechanical Properties of Polymeric Systems
… architecture and end-group functionality on the surface segregation characteristics of branched polymers in blends with commercially available linear polymers were also investigated. In the blends of branched PEIs with polystyrene (PS), the surface migration of PEIs correlates with the changes in …
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Surface tension and electroporation of lipid bilayers
… behavior is known to be largely dictated by surface energy. We hypothesize that this surface energy can be described by separate head and tail components of the lipid molecules, which can be obtained experimentally. In this thesis, we demonstrated a basic ability to electroporate lipid …
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Self-assembly of conformal polymer electrolyte film for lithium ion microbatteries
… hexane and PTFE, which have well-established surface energies, and then by measuring the contact angles of PEO on LCO in hexane and hexadecane, chosen for their immiscibility in PEO. For better comparison, these experiments were repeated using water instead of PEO, for a total of four systems …
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Interaction of stress and magnetic properties in patterned copper-nickel-copper thin films
… system to explore the interactions of strain, surface energies and magnetic properties. For that reason, is also an ideal system to explore the effects of patterning. It is expected that the miniaturization of patterned magnetic devices will be accompanied by a transition from polycrystalline …
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{112} Polar Surfaces of Copper(indium,gallium)selenide: Properties and Effects on Crystal Growth
… finding is the strong tendency of film surfaces to facet to {112} planes. The work attempted to establish the connections between the film morphology, the surface energies, the surface chemical compositions, and the reconstruction of polar surfaces. Using angle-resolved photoelectron …
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Investigation to Identify the Influence of the Surface Energetics of the Dry Powder Formulations of Budesonide and Theophylline on Their Aerodynamic Dose Emission Characteristics.
Surface energetics play a key role in the delivery of a dry powder inhaler formulation into the lungs, as there must be a sufficient balance of adhesive and cohesive forces to allow optimal lung delivery. In this study, measuring the surface energies of a set of single drug and carrier (budesonide …
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Hydrate-phobic surfaces
… involves reducing the adhesion of hydrates to surfaces, ideally to a low enough level that the force of flow detaches them and prevents plug formation. Systematic and quantitative studies of hydrate adhesion on smooth surfaces with varying energies were conducted. Surface energies were …
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Experimental and theoretical studies of elastic instability in growing yeast colonies and thin sheets
… the overall adhesive energy between cell surfaces. We demonstrate in a model experimental system that there exist conditions where a slowly growing tissue does not minimize this adhesive energy. A mathematical model demonstrates that the instability of a spherical shape is caused by the …
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Surface characterisation of modified pan based carbon fibres.
This thesis examines the surfaces of polyacrylonitrile (PAN) based high strength (HT) carbon fibres modified by electrochemical and ultra-violet ozone (UV/O3) treatment methods. The surface and bulk study was conducted by x-ray photoelectron spectroscopy, scanning electron microscopy, transmission …
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