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 49 for “"electrostatic forces"”.
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Molecular electromechanics : modeling electrostatic forces between GAG molecules
Thesis (M.Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Effects of Electrostatic Forces on Drop Collision and Coalescence in Air
Made available in DSpace on 2014-12-08T22:23:43Z (GMT). No. of bitstreams: 1 6507150.pdf: 3652488 bytes, checksum: c586b626bc6222d3f8a1cf39f423dfc5 (MD5) Previous issue date: 1965
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Fem of electrospinning compared to inkjet printing model
Electrospinning is a process that uses electrostatic forces to produce nanofibers, or fibers in the nano scale. Nanofibers are widely used in many fields like drug delivery and tissue engineering. Nowadays, it is gaining much attention in the research community as an advantageous process. However, …
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Particle Diffusivity in Fully Developed Turbulent Pipe Flow of Dilute Suspensions
… suspension under the influence of gravity and electrostatic forces.
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Improving the settleability of a metal sulphide suspension by the application of a magnetic field
… This results in the reduction of inter-particle electrostatic repulsive forces and subsequent increase in the zeta potential of a suspension. For the purposes of this study, a copper sulphide suspension was used. A T-mixer was used as the reaction zone for the precipitation of each suspension. …
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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 …
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The effect of applied and magnetic fields on the crystallisation of hydrocarbons
… that the magnetic and applied fields can affect electrostatic forces in molecular solids. It also showed that even the weakest of these forces, Van der Waals forces are affected by applied and magnetic fields.
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Characterizing the Movement of Contaminant Liquid Metal Particles when subject to Electric Pulses, within the Context of Z-pinch Fusion Reactors
… as initial temperature, vacuum conditions, and electrostatic forces. This research provides crucial insights for optimizing reactor design and mitigating contamination in future fusion energy applications. The study also proposes directions for further investigation, including the temperature …
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Electrostatic adhesion testing of metallizations on silicon substrates
… deposited on substrates such as silicon. Electrostatic adhesion testing employs electrostatic forces to generate delaminating stresses in thin metallic films. The interfacial adhesion strength is readily calculated from the electrode geometry and the applied electrostatic field at failure. …
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Near-field radiation in nanoscale gaps
… roughness of the microsphere and/or repulsive electrostatic forces. Surface roughness is included in the analytical analysis of the radiative heat transfer through an approximate model based on the Proximity Force Approximation.
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Conservation of Electrostatically Mediated Function Across Protein Families and Superfamilies
… balance between attractive and repulsive forces. Association occurs at the cost of removing waters from the binding site and reducing side chain degrees of freedom, which is balanced by the energy gained due to non-covalent interactions, burying of hydrophobic surfaces, and other …
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Synthesis and Characterization of Sugar Derivatives as Functional Gelators
… molecules bound non-covalently through forces such as: hydrogen bonds, electrostatic forces, Van der Waals interactions, and other weak forces such as π-π interactions. These interactions then lead to secondary structure formation through a similar assembly mechanism. Understanding the …
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Micro Electrostatic Actuation of a Silicon Diaphragm
… system) devices can be actuated by electrostatic forces, which utilize an induced electric field to pull two charged plates towards one another. Such devices were fabricated and electrostatic actuation of the diaphragms was performed to analyze its viability as a micro-speaker. The …
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Induced-charge electrokinetics at large voltages
… dilute solution of point charges with mean-field electrostatic forces. Even for very dilute solutions, however, it predicts absurdly large ion concentrations (exceeding close packing) for surface potentials of only a few tenths of a volt, which are often exceeded, e.g., in microfluidic pumps and …
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Development of an automated and scalable lab-on-a-chip platform with on-chip characterization
… control of drops on an array of electrodes using electrostatic forces. In contrast to most other lab-on-a-chip technologies (e.g., channel-based microfluidics), DMF is highly reconfigurable (i.e., function is defined by software and not by the physical structure of the chips). Thus, DMF offers the …
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Computational electrohydrodynamics for fabricating polymer microstructures
… These related processes both use the dielectric forces at the interface between a polymer and another dielectric such as air. When the molten polymers are placed in a shaped electric field the imbalance in these dielectric forces causes the polymer to flow in a controlled way creating shapes in the …
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Effect of Space Charges on Micro- to Nanoscale Electrostatic Actuation
… becomes important on micro- to nanoscale electrostatic actuations because the appropriate phenomenological electrostatic length scale is on the order of the physical scale of the system. A 1-D electromechanical model has been developed to provide quantitative analysis of the effect of the …
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Molecular thin films and their role in controlling interface properties
… first part of this study, frictional and normal forces in aqueous solutions were measured between a glass particle and oligopeptide films grafted from a glass plate. Homopeptide molecules consisting of 11 monomers of different amino acids were each "grafted from" an oxidized silicon wafer using …
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Investigation of the Mechanical Behavior of Microbeam-Based MEMS Devices
… stretching, an applied axial load, a DC electrostatic force, and, for the case of resonant sensors, an AC harmonic force. Further, a novel method that uses a reduced-order model is introduced for simulating the behavior of microbeams under a DC electrostatic force. The presented method …
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Development of implicit kinetic simulation methods, and their application to ion beam propagation in current and future neutralized drift compression experiments
… ion beams are positively charged, repulsive forces act on the beam ions. These electrostatic forces defocus the beam, increasing the beam size and degrading the applied compression and focus. Electrons are introduced via a preformed plasma to eliminate the electrostatic forces that defo- cus …
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