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 34 for “"adhesion force"”.
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Direct simulations of cells motions and deformations in flow
… channels with both smooth and uneven walls under adhesion force between the leukocytes and the channel wall. Leukocytes are represented by two composite fluid models. The first model is the compound-drop model in which the cytoplasm and the nucleus are modeled as fluids, and the second one is the …
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Assessment of Antistripping Agents on Adhesion of Damaged Asphalt by Neural Network
… (NN) model is developed to quantify nano-level adhesion force of moisture damaged asphalt binder using Atomic Force Microscopy (AFM) test data. AFM data contains five point force-distance values determined for some specific asphalt chemical functional groups. Asphalt binder samples contain …
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Transport and damage in hydrated coatings – a model soft active composite material
… measurements were conducted to measure the adhesion force between stainless steel probes and water-based coatings. Slower degradation in adhesion force during NaCl(aq) immersion of coatings with faster water transport was explained by the faster-swelling coating surface moving more rapidly …
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Substrate dependance, temperature dependance and temperature sensitivity and resolution of doped-silicon microcantilevers
… thermal time constant, and temperature-dependant adhesion force between and cantilever tip and substrates of silicon, quartz, and polyimide. The second objective is to utilize a heated microcantilever as a heater-thermometer. The experiments investigate the thermal calibration sensitivity and …
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Exploring Siderophore-Mineral Interaction Using Force Microscopy and Computational Chemistry
The forces of interaction were measured between the siderophore azotobactin and the minerals goethite (FeOOH) and diaspore (AlOOH) in solution using force microscopy. Azotobactin was covalently linked to a hydrazide terminated atomic force microscope tip using a standard protein coupling technique. …
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Shedding of Multiple Sessile Droplets
… exposed to an airflow, can be shed, if the drag force overcomes the droplets adhesion force. Presence of other sessile droplets, in proximity, changes the drag force, so the minimum airflow velocity required to shed the droplets (Ucr) can vary. In this thesis, an experimental study on shedding of …
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The Effect of Switchable Additives on Colloidal Interactions Found in Oil Sands
… candidates for industrial use. Chemical force spectrometry was used to evaluate adhesion forces present in model oil sand systems. Organic/mineral and mineral/mineral interactions were investigated in the presence of cationic and anionic switchable surfactants, as well as switchable ionic …
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Positive pressure induced channeled suction cups
… technique that is prone to leaking and loosing adhesion force, the suction cup is actuated by compressed air or liquid, which deforms the geometry of the cup to achieve suction. In order to verify the geometry changes during actuation, a uniaxial tension test was done on the elastic material …
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Influence of Extracellular Matrix Stiffness and Topography on Neuronal Cell Behavior and Neurite Outgrowth
… behavior of integrin and neural cellular adhesion molecule (NCAM). Results show that by increasing the ECM stiffness, the neuronal cell transfers higher stress to the ECM, known as mechanosensing. The mechanosensing, however, approaches saturation at a threshold ECM stiffness and is …
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Effects of Electric Fields on Forces between Dielectric Particles in Air
… quantitative measurement technique using atomic force microscopy (AFM) to study the effects of both DC and AC external electric fields on the forces between two dielectric microspheres. In this work we measured the DC and AC electric field-induced forces and adhesion force between two barium …
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Pharmaceutical powders in experiment and simulation : towards a fundamental understanding
… properties. Case studies relating interparticle adhesion to labscale powder performance (flow and blends) were completed with two active pharmaceutical ingredients and a number of excipients. In all of the flow cases, the rank order of interparticle or intermaterial adhesion forces measured with …
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Engineering optical traps for new environments and applications in the measurement of biological adhesives and motors
… developed to promote the integration of optical forces and semiconductor materials. This project provides a non-invasive method for control, construction, and measurement that leverages existing semiconductor fabrication techniques while retaining the nanometer position resolution and piconewton …
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THE INFLUENCE OF THE MICROENVIRONMENT OF HEALTHY AND TUMORAL CELLS
… study cellular interactions, among which Atomic Force Microscopy (AFM), for its versatility and robustness, stands as a reliable biosensor. This thesis reports in three main chapters the study of the cell-microenvironment interplay mainly through adhesion force spectroscopy techniques based on …
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Beetle exoskeletal structure and surfaces determine specialized functions: Two case studies
… The degree of wettability also has an effect on adhesion force onto wet surfaces. Thus, these two case studies show explicit functions of the body structures and surface structures of beetles.
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Micro Surface Texturing for Friction Control
… is derived demonstrating that a minimum friction force exists if the two components of the friction force, adhesion and mechanical deformation, are differentiated with respect to the real contact area. In addition, numerical simulations and experimental work were performed to test this hypothesis. …
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Reentrainment of Submicron Solid Particles
… lognormal probability density for the ratio of adhesion force to removal forces is suggested. The majority of particles is attached to the surface by strong forces and cannot be entrained. However, a small fraction of particles, called loose particles, is attached to the surface by much smaller …
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Solubilization-emulsification processes in nonionic surfactant-water-liquid triglyceride systems
… fabrics during washing. The relatively strong adhesion force between triglycerides and fabric and their high molecular volumes make detergency mechanisms which work well for other soils and cotton fabrics relatively ineffective with surfactants commonly used in washing products. It is likely …
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Lamination of Inverted Organic Photovoltaics and Associated Physical Properties
… the physics behind the basis of lamination: adhesion. Different mechanisms of adhesion are proposed, and calculations of adhesion forces based on known materials properties are made. The resulting range of calculated forces is quite large, but within the range of measured values for adhesion …
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Design and development of functional foot for agile and dynamic legged robots
… the traction capacity of the foot, appropriate adhesion mechanisms need to be applied to the foot. So far, existing adhesion mechanisms as the foot component have difficulties meeting the conditions of attaching/detaching on surfaces during a short stepping period to support relatively heavy …
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Cell-Fiber Interactions: A New Route to Mechano-Biological Investigations in Developmental and Disease Biology
… to cytoskeleton arrangement, including focal adhesion cluster lengths and nucleus shape indices, leading to altered migration speeds. It is hypothesized that these behaviors occur due to modulation of cellular inside-out forces in response to changes in the external fibrous environment …
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