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.
Results
Showing 1 to 20 of 68 for “"Surface forces"”.
-
Surface Forces in Foam Films
Fundamental studies of surface forces in foam films are carried out to explain the stability of foams and froths in froth flotation. The thin film pressure balance (TFPB) technique was used to study the surface forces between air bubbles in water from equilibrium film thickness and dynamic film …
-
Surface Forces in Thin Liquid Films
… as in colloid films between two macroscopic surfaces and foam films between two air bubbles; and between two dissimilar phases, as in wetting films. Stability of the colloids, foams, and wetting films is determined by the surface forces in the TLFs. Depending on the nature of the surfaces …
-
Interfacial Phenomena and Surface Forces of Hydrophobic Solids
… 100 nm–1 m. This work sets out to measure the forces between particles with a radius of about 10 µm. Because we can only measure the total force, which includes the van der Waals force and the electrostatic forces, it is important to isolate the effect of “hydrophobicity”. We do this by …
-
Surface forces during electrophoretic assembly of micron scale silica particles
… by as much as two pH units, with the R-plane surface exhibiting the most acidic behavior and the C-plane samples having the highest i.e.p.
-
A bubble-particle interaction model for flotation combining hydrodynamic and surface forces
… considers the effects of hydrodynamic and surface forces on the interaction between bubbles and particles. Model predictions have been shown to be in good agreement with results from bubble-particle attachment experiments for narrowly-sized coal and silica samples. In the present work, the …
-
A COMPARATIVE ANALYSIS OF NAVAL SURFACE FORCES ATLANTIC AND PACIFIC COMBAT SYSTEMS DEPARTMENTS
… community of the United States Navy is the surface Navy. It is commonly accepted that there are two versions of the surface Navy: the Atlantic Navy and the Pacific Navy. From the viewpoint of combat systems, both should operate in the same manner, using the same guidance, with the same …
-
Surface Forces in Thin Liquid Films of H-Bonding Liquids Confined between Hydrophobic Surfaces
… of interactions between macroscopic hydrophobic surfaces in H-bonding liquids, including water, ethanol, and water-ethanol mixtures. The first part of the present study involves the measurement of the hydrophobic forces in the thin liquid films (TLFs) confined between two identical hydrophobic …
-
Investigation of short-range surface forces to develop self-organizing devices by Steven M. Tobias.
… from atomic force microscopy were used to verify surface energy components of indium tin oxide and mesocarbon microbeads. These materials were selected based on spectroscopic and thermodynamic parameters to be used in self-organizing devices. Estimates for surface energy were based on the van der …
-
Surface Forces between Silica Surfaces in CnTACl Solutions and Surface Free Energy Characterization of Talc
… methods. <i>One</i> is to directly measure the forces between two interacting surfaces in media. <i>The other</i> is to study the interfacial surface free energies of the particles in suspension. Direct surface force measurements were conducted between silica surfaces in …
-
Surface forces apparatus (SFA) studies on n-octadecyltriethoxysilane self-assembled monolayers on untreated and plasma-treated mica
… and quantitatively investigated with a surface forces apparatus (SFA) under various environmental conditions The interaction force between the OTE monolayers immersed in water showed that plasma treatment reduced the range of the steep short-range repulsion and motivated the water vapor …
-
Dynamics of polymer melts confined between adsorbing surfaces spaced at molecular dimensions
… (PPMS) adsorbed between mica surfaces spaced at molecular dimensions undergoes oscillatory shear. The polymers experience a dynamic liquid-like to rubber-like transition at the onset of long range surface forces $(\sim$4.5 R$\sb{\rm G}).$ The long time relaxations of the …
-
Modeling Flotation from First Principles Using the Hydrophobic Force as a Kinetic Parameter
… A TLF ruptures when the disjoining pressure (or surface forces per unit area) of the film becomes negative, i.e., Π < 0. Thermodynamically, a wetting film can rupture when the contact angle (θ) of a mineral surface is larger than zero. It would, therefore, be reasonable to consider the roles of …
-
Optical deformability : micromechanics from cell research to biomedicine
When a laser beam is incident on the surface of a transparent object, the optical surface forces, generated by the interaction of the light with the material, are directed away from the denser material and normal to its surface. This physical phenomenon can be used to probe the mechanical …
-
Relaxations in molecularly thin simple liquid films: Linear viscoelasticity and non-linear response to shear
… simple liquid films confined between two solid surfaces were studied. The method was to measure the resistance to applied oscillatory shear deformation as a function of frequency and amplitude of deformation, film thickness and normal pressure using the modified surface forces apparatus …
-
How does adhesion influence the small aggregates in Saturn's rings
… are primarily made of water ice attractive surface forces like adhesion could significantly influence these processes, finally determining the resulting size distribution. Here, we derive analytic expressions for the specific self-energy Q and related specific break-up energy Q⋆ of …
-
Image-Based Modeling of Porous Media Using FEM and Lagrangian Particle Tracking
… the impact of pore-scale hydrodynamics and surface forces on NP transport. Two XCT images, a Berea sandstone and a 2.5D micromodel, were meshed and used for image-based flow modeling of FEM Stokes flow. The effects of particle size, surface forces, flow rate, particle density, surface …
-
Surfactant Adsorption during Collisions of Colloidal Particles: A Study with Atomic Force Microscopy (AFM)
… a function of the separation between two glass surfaces. In addition, self-consistent field theory (SCF) is used to calculate the adsorption profiles and interaction energies when two solid surfaces are brought into close proximity. Addition of surfactant is shown to affect the surface forces …
-
Structure and dynamics of confined chain molecules
… layering was disrupted so that no oscillatory surface forces were measured. On the other hand, molecules with low degree of branching showed a weakly ordered structure, yet layering persisted. Curiously, all of these molecules could show dynamics where the elasticity was larger than …
-
Theoretical and Experimental Atomic Force Microscopy Investigations of Staphylococcus aureus
… non-linear force versus displacement regime, and surface forces were not able to account for the long range repulsive behavior. Neither surface forces nor steric forces explain velocity dependence. A force curve model was developed by expanding the two spring model to a four spring model to …
-
Experimental Investigation of Liquid and Particle -Laden Flows in Microtubes
… collisions result in particles attaching by surface forces to form large groups of physically connected particles (flocs). It is also suggested as a mechanism for blockage that occurs when d p < 0.1D.
Page 1 of 4