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 305 for “"Electrospray"”.
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Electrospray power processing unit for a monopropellant-electrospray multimode thruster
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Characterization of 1-butanol electrospray combustion
This study examined the characteristics of electrosprays of 1-butanol that burn in air. Still images and high-speed movies captured with a laser sheet present helped to establish general flame phenomenology and features such as shape, size, and stability of the spray flame. The dependence of the …
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3D-Printed, Internally Fed Electrospray Thruster
An electrospray thruster offers several benefits as a propulsion system for small satellites, including a lower power requirement when miniaturized and a broad range of thrust and specific impulse. However, traditionally it has been manufactured through microfabrication in a cleanroom, which is …
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Electrospray emitters For diffusion vacuum pumps
… principles as regular diffusion vacuum pumps, an electrospray emitter is set to produce a jet of charged particles that will drag air molecules out of a volume. To be a feasible concept, the emitted particles should have enough momentum to make the colliding air particles being effectively removed …
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Exploration of Planetary Bodies with Electrospray Thrusters
… for operating these small spacecraft. Electrospray propulsion is a promising technology for high-Delta-v propulsion of small spacecraft due to its mechanical simplicity and scalability. However, methodologies for characterizing the propulsion system thrust on orbit have so far been …
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Silicon wafer integration of ion electrospray thrusters
… compactness, and high specific impulse, electrospray thrusters provide a unique solution to the problem of active control in the burgeoning field of miniature satellites. With the potential of distributed systems and low cost functionality currently being realized through development of …
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An investigation of nafion electrospray emitter tips
Electrospray propulsion development is limited in large part by the materials with which emitters are manufactured. Emitters must transport ionic liquid to their apex and hold a shape which allows menisci to form and emit pure ions. The motivation for this work was to investigate Nafion, a …
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MANIPULATION OF ELECTROSPRAY GENERATED DROPLETS USING VARIOUS VAPORS
… be entrained in desolvation gas to manipulate electrospray generated droplets. These reagent vapors are admitted into the atmospheric interface region of a QqTOF tandem mass spectrometer. The electrospray droplets interact with the reagent vapors between the curtain and orifice plate for …
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An Electrospray Solution to the Pulmonary Delivery Problem
… lung disease. A new device is developed using electrospray technology to deliver molecules into respiratory tissues via a bronchoscope. Novel diagnostic and therapeutic interventions are now possible by delivering appropriate molecules to target sites. The impact of this thesis is to facilitate …
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Solid-State Flow Control for Ion Electrospray Propulsion
Electrospray propulsion offers high-efficiency, low-mass propulsive capabilities, based on ion extraction from ionic liquid propellants, to small spacecraft that exceed the capabilities of conventional chemical propulsion. Two shortcomings of such propulsion systems is their lack of lightweight …
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CubeSat attitude control using micronewton electrospray thruster actuation
Micronewton electrospray thrusters are a promising new actuator for CubeSat attitude control. Electrospray thrusters have advantages over current state of the art CubeSat attitude actuators in mass, volume, and their ability to produce translational acceleration in addition to control moments. An …
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Considerations for a multi-modal electrospray propulsion system
… to elude traditional thruster concepts. The ion Electrospray Propulsion System (iEPS) is a microelectromechanical (MEMS) based electrostatic thruster for space propulsion applications. This technology makes use of ionic liquid ion sources (ILIS) and a porous emitter substrate to obviate the need …
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Application of an electrospray thruster in a nanosatellite
… contribute significant weight to the system. An electrospray thruster, a MEMS-based electric propulsion (EP), can provide the necessary thrust requirements. After calculating the Av budget and attitude control needs, it was determined that 0.474 mN of thrust was needed for this momentum-biased …
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Electrospray mass spectrometric analysis of transition metal carbonyl clusters
A key objective of this thesis was to develop Electrospray (Ionisation) Mass Spectrometry (ESMS) within organometallic chemistry, specifically as a technique for investigating transition metal carbonyl cluster chemistry. An initial survey of air-sensitive high-nuclearity rhodium and nickel …
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Flujos con superficies libres electrospray y generación de burbujas
… experimentalmente la atomización electrostática (electrospray) de disoluciones de líquidos iónicos, y sus aplicaciones a la producción de haces de iones y a la propulsión eléctrica. En un electrospray, un menisco del líquido que se quiere atomizar, que debe ser un conductor eléctrico, es sometido …
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Experimental investigation of ionic liquid mixtures for electrospray propulsion
… into the characterization and design of the electrospray (electric) mode of multi-mode propellant systems. The first paper focuses on determining species in the electrospray plume of a specific propellant, composed of 1-ethyl-3-methylimidazolium ethylsulfate ([Emim][EtSO<sub>4</sub>]) and …
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Numerical optimization of ion transport in electrospray mass spectrometry
Electrospray ionization (ESI) has developed into a key component of investigative analyses of samples in numerous biological, chemical, and geological contexts due to its unique ability to preserve the structure of ionized species without fragmentation. It is thus important that we fully understand …
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Molecular dynamics modeling of ionic liquids in electrospray propulsion
… for precise satellite attitude control. Electrospray thrusters are promising thrusters built upon the state of the art in micro-technology and with flexible performance in terms of their high efficiency and high specific impulse. One challenge is to investigate in detail the mechanism for …
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Optimizing wettability of externally wetted microfabricated silicon electrospray thrusters
Electrospray propulsion devices with externally wetted architectures have shown favorable performance. The design of microfabricated silicon thrusters and their feed systems requires an understanding of propellant flow over a silicon surface. This research explores the parameters that affect …
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Porous material and process development for electrospray propulsion applications
Ion electrospray propulsion devices rely on the transportation of ionic liquid propellant to emission regions where ions are extracted at high velocities. One such method involves the use of porous substrates to passively transport propellant towards conically shaped features of the same porous …
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