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 29 for “"electrowetting"”.
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A study of electrowetting-assisted boiling
… is then presented. The theory of DC and AC electrowetting is described along with electrolyis and electric breakdown, two common problems in successfully demonstrating electrowetting. Next, the construction of a 1000V DC power supply for electrowetting experiments is outlined along with …
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An Experimental Investigation of Electrowetting Modulated Nucleate Boiling
Electrowetting (EW) has drawn significant research interests in droplet-based microfluidics, and most applications focus on electronic displays, lab-on-a-chip devices and electro-optical switches, etc. In this work, we report a novel application of EW in enhancing nucleate boiling heat transfer. …
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Electrowetting study of jumping droplets on hydrophobic surfaces
… of energy is fundamentally studied by using electrowetting to decrease the equilibrium contact angle, increasing droplet surface area. Releasing the voltage allows the droplet to release excess surface energy, causing the droplet to jump off the surface. In contrast with previous work, …
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The Application Of Graphene Films In Biosensing And Electrowetting
… the first time, a microfluidic device based on electrowetting-on-dielectric (EWOD) using a graphene electrode. Hydrophobic surfaces of graphene facilitate self-assembly of the hydrophobic dielectric layer (Teflon). Using graphene electrode, we are able to achieve robust and reversible changes in …
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A Numerical Simulation Optimizing Droplet Motion Driven by Electrowetting
<p>A numerical simulation of electrowetting on a dielectric was performed in COMSOL to grant insight on various parameters that play a critical role in system performance. The specific system being simulated was the Open Drop experiment and the parameters being investigated were the applied …
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Experiments To Improve Behavior of Electrowetting Surfaces in Microhydraulic Actuators
… actuators based on the principles of electrowetting were developed at MIT Lincoln Laboratory. The actuators consist of two parts, rotor (droplet array) and stator (electrode array), that move relative to each other. This thesis focuses on the latest two versions of actuators, MHA5 and …
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Emulsification, separation, and manipulation of oil-water systems using condensation, electrocoalescence, and electrowetting
… manipulate oil and water using ultra low-voltage electrowetting. The emulsification method relies on condensation of one liquid phase onto another. As nanoscale droplets of water condense onto the surface of oil, they are submerged and stabilized in the oil by a surfactant in the oil phase. The …
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Microfabricated Surfaces and Particles for Advanced Immunoassay Platforms and High-Efficiency Electrowetting Heat Transfer System
… detection. Finally, we have developed an electrowetting-modulated nucleate boiling system to enhance heat transfer. We designed and fabricated electrowetting devices on silicon dioxide wafers that contain hydrophilic, continuous hydrophobic or patterned hydrophobic surfaces. Through this …
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Development of a Digital Microfluidic Lab-on-a-chip for Analysis of Atmospheric Inorganic Ions
… the micromanipulation of discrete droplets using electrowetting. Electrowetting refers to the application of an electric field which modifies the wetting behavior of a droplet. Methylthymol Blue (MTB), O-Phthaldialdehyde (OPA), and nitrate reductase colorimetric assays were initially developed …
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Experimental studies of liquid marbles and superhydrophobic surfaces
… of droplet movement and may be achieved by electrowetting, the application of a voltage between a liquid droplet and a substrate, and/or by varying the local topography of the surface. Photolithography and thin-film deposition fabrication techniques have been used to create hydrophobic and …
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Solid-State Flow Control for Ion Electrospray Propulsion
… thruster in the first place. Previous work on an electrowetting valve provided a single-use activation barrier to prevent propellant from flooding the thruster's emitter prior to launch and shorting the thruster entirely. The next reasonable evolution in this propellant management area is to …
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Droplet IO : programmable droplets for human-material interaction
… tunable optics. DropletIO system uses electrowetting on dielectric (EWOD) to manipulate droplets. EWOD is a physical phenomenon where a polar droplet on a dielectric surface is attracted to a charged electrode. I constructed EWOD arrays with integrated actuation and sensing on …
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Electrodynamic droplet actuation for lab on a chip system
This work presents the development of electrowetting on dielectric and liquid dielectrophoresis as a platform for chemistry, biochemistry and biophysics. These techniques, typically performed on a single planar surface offer flexibility for interfacing with liquid handling instruments and …
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Designing a microhydraulically-driven mini-robotic squid
… constraints. Recently, a novel microhydraulic electrowetting actuator (MEA) has been developed at MIT Lincoln Laboratory, enabling powerful, efficient, and scalable actuation. The MEA's use of efficient (17 > 65%), low-voltage electrowetting (<25 V) and high power density favorably positions …
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Liquid lens beam steering and environmental testing for the miniature optical steered antenna for inter-satellite communication
… Varioptic lenses rely on the principle of electrowetting for lens actuation, while Optotune lenses are driven by a voice coil. For steering, a liquid lens is placed offset from the optical axis. Varying the liquid lens focal length will cause the beam to steer in 1D by refraction, but also …
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Voltage induced spreading and liquid optical devices
… an effect which will be referred to here as "dielectrowetting". Further application of the A.C. voltage to the electrodes results in a static sinusoidal wrinkle forming at the oil-air interface on the spread film. Three main areas of investigations are reported, the first of which is a study of …
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Development of High-Performance Optofluidic Sensors on Micro/Nanostructured Surfaces
… in recent years. By taking advantage of the electrowetting phenomenon, the wettability of liquid droplet on micro/nano-structured surfaces and the Leidenfrost effect, this doctoral research focuses on developing high-performance optofluidic sensing systems, including optical beam adaptive …
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Microscopic Physics of Electrical Double Layers
… ionic liquid electrolytes, bioseparations, electrowetting, cement cohesion, and general colloidal stability. The continuum mathematical models I derive for the electrical double layer capture electrostatic correlations in electrolytes containing multivalent ions, the molecular-level layered …
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FIELD-PROGRAMMABLE MICROFLUIDIC TEST PLATFORM FOR POINT-OF-CARE DIAGNOSTICS
Early work in electrowetting on dielectric (EWOD) devices has demonstrated their great potential in microfluidics; however, further work is needed to integrate EWOD technology into a system deployable for point-of-care (POC) diagnostics. This research is aimed at providing enabling technologies …
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Sparse Sample Detection Using Magnetic Bead Manipulation on a Digital Microfluidic Device
… wires embedded in the actuation electrode of an electrowetting-‐‑on-‐‑dielectric (EWD) device. The current wire structure serves as a microelectromagnet, which is capable of segregating and separating magnetic beads. The device can achieve high segregation efficiency when the wire spacing is …
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