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Showing 1 to 20 of 29 for “"work of adhesion"”.
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The Effect of Work of Adhesion on Contact of a Pressurized Blister With a Flat Surface
… 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 knowledge of adhesion of solids, a …
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Imaging and Understanding Atomic-Scale Adhesion and Wear: Quantitative investigations Using in situ TEM
… physics governing tribological interactions - adhesion, friction, lubrication, and wear - are poorly understood. Significant progress has been enabled by nanoscale studies using the atomic force microscope (AFM). However, AFM lacks direct access to the contact geometry and structure. In this …
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Hydrate-phobic surfaces
… hydrate formation and subsequent plugging of deep-sea oil and gas pipelines represent a significant bottleneck for ultra deep-sea production. Current methods for hydrate mitigation focus on injecting thermodynamic or kinetic inhibitors into the flow, heating the pipe walls, or managing the …
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Characterization of anodic bonding
… a new MEMS device and packaging material because of its excellent material properties including high strength, hardness, and thermal conductivity. An alternative, low temperature glass to CVD SiC anodic bonding process is required in order to prevent gold tin braze stress relaxation. A novel …
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Force and Energy Measurement of Bubble-Particle Detachment
Possibilities for increasing the upper limit of floatable particle sizs in the froth flotation process have been examined since the early beginnings of mineral flotation. The economic implications of such an incresae are far ranging; from decreased grinding costs and increased recoveries to …
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Measurement of Surface and Interfacial Energies between Solid Materials Using an Elastica Loop
The measurement of the work of adhesion is of significant technical interest in a variety of applications, ranging from a basic understanding of material behavior to the practical aspects associated with making strong, durable adhesive bonds. The objective of this thesis is to investigate a novel …
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Carbon fiber surface treatments for improved adhesion to thermoplastic polymers
The effect of anodization in NaOH, H₂SO₄, and amine salts on the surface chemistry of carbon fibers was examined by x-ray photoelectron spectroscopy (XPS). The surfaces of carbon fibers after anodization in NaOH and H₂SO₄ were examined by scanning transmission electron microscopy (STEM). angular …
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Functionality And Role Of Different Fatty Alcohols In Topical O/W Cream Formulation
… pharmaceutical formulations. The objective of the present study was to evaluate the impact of incorporating different fatty alcohols on microstructural and formulation characteristics of topical o/w clotrimazole cream formulation. The formulations containing different fatty alcohols as …
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Energy density method and its applications to defect energies
… energy density method also provides a picture of the distribution of the energy among the surrounding atoms; although the value assigned each atom is not unique, it gives trends. One purpose of this work is to investigate the extent to which the distribution of the energy around the defect can …
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Nanoscale thermal transport through solid-solid and solid-liquid interfaces
… presents an experimental investigation of heat transport through solid- solid and solid-liquid interfaces. Heat transport is a process initiated by the presence of a thermal gradient. All interfaces offer resistance to heat flow in the form of temperature drop at the interface. In micro …
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Mechanisms and mechanics of non-structural adhesion
Two topics dealing with adhesion are addressed: an investigation of the cling of thin polymeric films and an analysis of the effects of viscoelasticity on adhesive systems involving curvature mismatch. The results of an investigation into the mechanisms of adhesion and debonding energy associated …
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Strength Development at Incompatible Polymer Interfaces
Mechanical strength of incompatible polymer interfaces welded above T$\sb{\rm g}$ has been investigated as a function of time, temperature, and composition. Three pairs of polymers were used: polystyrene-polymethylmethacrylate, polystyrene-co-acrylonitrile-polymethylmethacrylate, and …
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Studies on the stability of thin films in bubble-particle adhesion
The critical rupture thicknesses (H<sub>C</sub>) of thin liquid films between air bubbles and solid surfaces have been measured using an optical interferometry technique. The results of the measurements show that H<sub>C</sub> increases with the increasing hydrophobicity of a solid and varies …
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ΜΕΛΕΤΗ ΤΩΝ ΕΠΙΦΑΝΕΙΑΚΩΝ ΚΑΙ ΔΙΕΠΙΦΑΝΕΙΑΚΩΝ ΙΔΙΟΤΗΤΩΝ ΤΗΣ ΣΤΑΘΕΡΟΠΟΙΗΜΕΝΗΣ ΖΙΡΚΟΝΙΑΣ ΚΑΙ ΣΥΣΤΗΜΑΤΩΝ ΖΙΡΚΟΝΙΑΣ ΣΕ ΕΠΑΦΗ ΜΕ ΡΕΥΣΤΑ ΜΕΤΑΛΛΑ
… EQUILIBRATION TECHNIQUE FOR THE MEASUREMENT OF CONTACT ANGLES, THE SURFACE AND GRAIN-BOUNDARY ENERGIES OF POLYCRYSTALLINE CUBIC ZRO2 IN THE TEMPERATURE RANGE OF 1173 TO 152 B.K. WERE DETERMINED. THE TEMPERATURE COEFFICIENTS OF THE LINEAR TEMPERATURE FUNCTION OBTAINED, ARE EXPRESSED AS …
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The Effect of Adhesion on the Contact of an Elastica with a Rigid Surface
The understanding of topics such as friction, wear, lubrication, and adhesive 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 …
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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.
… 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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Wafer bonding : mechanics-based models and experiments
… as an important technology in the manufacture of silicon-on-insulator substrates (SOI), microelectromechanical systems (MEMS), and three-dimensional integrated circuits (3D IC's). While the process is currently employed in applications such as these, a lack of knowledge of the basic mechanics …
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A study of hydrophobic interaction in fine particle coagulation
… known as DLVO theory, has gone through the test of time and survived as a pillar of colloid science. In the present work, this theory has been used for describing the behavior of fine coal and silica particles in aqueous media. It has been found, however, that the classical DLVO theory is …
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Synthesis and Characterization of Multi-Component Polymeric Materials Prepared via Free Radical Polymerization
… polystyrenes were prepared via the coupling of 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) terminated polystyrene oligomers with divinylbenzene (DVB) in m-xylene at 138 °C. Linear polystyrene oligomers (Mn = 19,300 g/mol, Mw/Mn = 1.10) were synthesized in bulk styrene using benzoyl peroxide …
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Analysis of Bimetallic Adhesion and Interfacial Toughness of Kinetic Metallization Coatings
… properties without compromising the properties of the substrate, coatings have become ubiquitous in heavy industrial applications for corrosion, wear, and thermal protection, among others. Kinetic Metallization (KM), a solid-state impact consolidation and coating process, is well-suited for …
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