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 “"Adhesion Energy"”.
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A Preliminary discourse on Adhesion of Nanofibers Derived from Electrospun Polymers
… bio-mimic gecko's foot hair, which possess high adhesion strength and can be re- usable for lifetime, fibrous membranes are fabricated by electrospinning to provide sufficient adhesion energy. Shaft-loaded blister test (SLBT) is firstly used to measure the work of adhesion between electrospun …
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Theoretical and Experimental Investigation of Adhesion in Microelectromechanical Systems
… to a wide-range of humidity levels and adhesion parameter values. By integrating the force-displacement curve, the adhesion energy per unit area was calculated for MEMS surfaces, which matched the experimental data very well from low to high relative humidity (RH) values, while the …
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Mode I and Mode II Measurements For Stiction Failed Micro-Electro-Mechanical Systems
… failure is stiction. Stiction is the unintended adhesion between two surfaces when they are in close proximity to each other. Various studies have been conducted in recent years to study stiction. Our research group has shown the in-service repair of the stiction failed MEMS devices is possible …
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Effects of Linoleic Acid on Tether Formation between Monocytes and Endothelial Cells
… linoleic acid leads to an increase in monocyte adhesion to endothelial cells under flow conditions; however, the mechanisms through which linoleic acid affect monocyte adhesion remain unclear. Using a combination of micropipette aspiration techniques and fluorescent microscopy, I tested the …
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Programmable adhesion in dry and wet environments through geometric design
… and wound management. To enable switchable adhesion, adhesives require to achieve high capacity of resisting crack propagation while allowing promotion of the crack propagation for easy release. Difficulty of achieving switchable adhesion is further amplified in wet environment. Achieving …
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Characterization of Mechanical Properties at the Micro/Nano Scale: Stiction Failure of MEMS, High-Frequency Michelson Interferometry and Carbon NanoFibers
… areas of micro and nano devices, can leads to adhesion in MicroElectroMechanical Systems (MEMS) and NanoElectroMechanical Systems (NEMS) - a.k.a. stiction-failure. The adhesive forces between MEMS devices leading to stiction failure are characterized in this dissertation analytically and …
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Entropy, Energy and Dynamics of Coalescing Spherical and 1D Aerosols
… entropy. Kinetic entropy is composed of internal energy (1/2 *k<sub>B</sub>T* for each degree of freedom) and partition functions (containing translational and rotational contributions). Even though surface entropy and configurational entropy exhibit substantial values, SPD can persist in …
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Elastic and Thermoelastic Stresses in Biomedical Sensors and Bicomponent Fibers
… blister test was devised to quantify interfacial adhesion energy for industrially relevant polymer pairs such as polypropylene/polyethylene (PP/PE). Analytical models were developed to predict thermoelastic stress distributions across common fiber cross-sections, with the experimentally measured …
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Rational manipulation of substrate-supported graphene by heterogeneity of substrate surface and material composition
… wavelength and amplitude and graphene-substrate adhesion energy. In the first part of this thesis a quantitative scheme is formulated to characterize and predict these deformations. A critical value of interfacial adhesion energy marks a transition point that separates two deformation regimes of …
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Structural Basis of the Tensile Strength of Protein Complexes Mediating Cell Adhesion
… the behaviour of adhesive complexes of cell adhesion molecules undergoing forced detachment. Molecular-forces measurements combined with Steered Molecular Dynamic (SMD) simulations were used to investigate the mechanical response of the CD2 C58 and hemophilic C-cadherin bonds. The CD2-CD58 …
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Phase-Field Model For Heterogeneous Biofilm-Solvent Interaction and 3-D Numerical Simulation by GPUs
… in our model. By using a double well free energy density function and adding a logistic growth model, we found our model captures the pattern formation experiments very well qualitatively. We also added more features to our model like adhesion energy to simulate more realistic 3-D …
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Structure-Property Relationships and Adhesion in Polyimides of Varying Aliphatic Content
… to understand their molecular origins. The adhesion performance of a selected series of partially aliphatic polyimides to SiO2/Si was examined using a shaft loaded blister test, which was designed and instrumented for use in a dynamic mechanical analysis instrument. The adhesion was studied …
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Direct Measurements of Polyelectrolyte Brush Responses using Atomic Force and Optical Microscopy
… properties that can be triggered are for example adhesion, charge, friction, stiffness,optical properties, porosity, or biocompatibility. This can be obtained by changing the environment, and by external stimuli. For this reason, such systems are ideal for the rational design of sensors and …
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Consequences of Asymmetric Environment on the Mechanics of Lipid Bilayer
… during the shape evolution. Third, we model the adhesion of vesicles to planar substrates induced by asymmetric distribution of proteins across the membrane. Our work furnishes a novel universal relationship for the estimation of adhesion energy of the proteins from the shape of the adhered …
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Kelvin Probe Force Microscopy on Graphene Thin Films for Solar Cell and Biosensing Applications
… KPFM under laser irradiation. To this end, the adhesion of eight proteinogenic amino acids, including Arginine, Tryptophan, Histidine, Lysine, Phenylalanine, Alanine, Asparagine, and Aspartic acid, on the graphene samples was studied using KPFM. The adhesion energy was increased in the order of …
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Mechanical properties of energetic composites
… The binder elastic modulus and crystal-binder adhesion energy were estimated at high and low strain-rates.
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Self-assembly of Nanoparticles on Fluid and Elastic Membranes
… development of tubular structures requires less adhesion energy than budding, pointing to a potentially unexplored route of viral infection and nanoparticle internalization in cells. In Chapters 5 - 8, we shift focus to elastic membranes and study self-assembly of nanoparticles mediated by …
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SYNTHESIS AND CHARACTERIZATION OF ONE-DIMENSIONAL COPPER STRUCTURES
… to that of bulk Cu. On the other hand, the adhesion force and adhesion energy per unit area of the interface were found to be up to 67.62 mN and 544.87 J m-2, respectively, which are significantly higher compared to other one-dimensional (1D) nanostructure arrays evaluated using the same …
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Underlying Mechanisms of Halide Perovskites Properties and Metal Insulator Transitions in Vanadium Dioxide
… smaller valence band offsets, higher interfacial adhesion energies, and greater formation energies of interfacial metal vacancies. Additionally, FA<sub>0.4</sub>MA<sub>0.6</sub>PbI<sub>3</sub> exhibits superiority over MAPbI<sub>3</sub> as a light-absorbing layer with Co<sub>3</sub>O<sub>4</sub> …