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 94 for “"dielectrophoresis"”.
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Materials separation by dielectrophoresis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1989.
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Portable iso-dielectrophoresis system
Iso-dielectrophoresis (IDS) can be used to characterize and separate cells by their electrical characteristics. An IDS system usually consist of a RF frequency voltage source up to 24 V, syringe pumps, microscope, and computer. Much of this equipment is difficult to transport, making off-site …
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Dielectrophoresis of sub-micrometre particles
… PhD project was to develop the technology of dielectrophoresis on the sub-micrometre scale and to use DEP to manipulate sub-micrometre particles and measure their dielectric properties. Of particular interest was the application of DEP to viruses, the largest of which is approximately 250 nm …
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High-Frequency Electronics for Contactless Dielectrophoresis
… the time required for many laboratory processes. Dielectrophoresis, or the motion of a polarized particle in the presence of a non-uniform electric field, has emerged as a promising method for biological sample concentration. By relying upon electrical properties that are intrinsic to a cell or …
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Embedded Passivated-electrode Insulator-based Dielectrophoresis
… embedded passivated-electrode insulator-based dielectrophoresis (EπDEP) for preconcentration, separation, or enrichment of bioparticles, including living cells. This new method combines traditional electrode-based DEP and insulator-based DEP with the objective of enhancing the electric field …
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Direct numerical simulations and experimental investigation of dielectrophoresis
… and experimental studies of the phenomenon of dielectrophoresis, i.e., the motion of neutral particles in nonuniform electric fields. Dielectrophoresis is the translatory motion of neutral particles suspended in a dielectric medium when they are subjected to an external nonuniform electric …
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Insulator-based Dielectrophoresis for Bacterial Characterization and Trapping
… and isolation of bioparticles. Insulator-based dielectrophoresis (iDEP) is a promising technique for analyzing, characterizing and isolation of microparticles based on their electrical properties. By employing insulator-based constrictions within the microchannel in combination with …
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Manipulation of bacteria using three dimensional insulator based dielectrophoresis
Insulator-based dielectrophoresis (iDEP) is a very promising technique for sorting microparticles based on their electrical properties. By using constrictions in a microchannel to generate large electric field gradients, the need for microfabricated electrode arrays is eliminated. In this work, …
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Selective microorganism concentration using a dielectrophoresis-based microfabricated device
… contaminants such as sand or soot by means of dielectrophoresis. Spores of B. subtilis as well as model airborne interferents are characterized electrically; based on their properties, schemes of their electrical separation are proposed. The separation based on the frequency of applied electric …
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Development of a Dielectrophoresis-Based Cancer-Cell Analysis Tool
… leverages the unique advantages of a contactless dielectrophoresis, a method that uses applied electric fields in a microfluidic device to separate cells by biophysical phenotype. By optimizing force balancing between the dielectrophoretic force and the drag force on cells in the device, and by …
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Three-Dimensional Passivated-Electrode Insulator-Based Dielectrophoresis (3D-PiDEP)
… Microfluidic chips based on insulator-based dielectrophoresis (iDEP) provide a promising solution to these problems and have been previously used to selectively concentrate biological particle such as bacteria. The microfluidic devices in this work were created with a 3D mircofabrication …
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Dielectrophoresis study of electroporation effects on dielectric properties of biological cells
… this phenomenon. In this thesis we introduce a dielectrophoresis (DEP) based technique to study changes in the cytoplasm conductivity of single Chinese hamster ovary (CHO) cells immediately after electroporation. Using a microfluidic chip, we study changes in the DEP response of single CHO cells …
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Electrical characterization of leukocyte activation for monitoring sepsis progression using dielectrophoresis
This thesis describes the development of a rapid dielectrophoretic characterization tool for monitoring leukocyte activation, and its application for monitoring sepsis progression. Sepsis is an uncontrolled activation of the immune system that causes an excessive inflammatory response or an …
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Multi-frequency characterization of single cells through CM factors and dielectrophoresis
This thesis explores the use of dielectrophoresis to discern the electrical properties of single cells by observing them at multiple frequencies. We first simulate experimental conditions to show that as we increase the number of measured frequencies, we are able to better discriminate among …
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Contactless Dielectrophoresis towards Drug Screening and Microdevice Development for Cell Sorting
Firstly, this work demonstrates that contactless dielectrophoresis (cDEP) was useful to detect a reversal in the electrical phenotype of late-stage ovarian cancer cells to a profile similar to that of slow-growing early-stage ovarian epithelial cells after treatment with a non-toxic bioactive …
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Cell Phenotype Analyzer: Automated Techniques for Cell Phenotyping using Contactless Dielectrophoresis
… delves into biological cell phenotyping under a dielectrophoresis setup using computer vision. Dielectrophoresis is a well-known phenomenon in which dielectric particles are subjected to a non-homogeneous electric field. This work is an analytical part of a larger proposed system replete with …
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Marker-Free Isolation and Enrichment of Rare Cell Types Including Tumor Initiating Cells through Contactless Dielectrophoresis
… types based on their electrical signatures using dielectrophoresis (DEP) without having direct contact between the electrodes and the sample, known as contactless dielectrophoresis (cDEP). DEP is the motion of a particle in a suspending medium due to its polarization in the presence of a …
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Dielectrophoretic manipulation of biological and non-biological analytes in a microfluidic channel
… and shear lead to a new many-body phenomenon of dielectrophoresis accompanied by the field-induced phase separation in a flowing suspension. As a result, shear and electric stresses strongly compress a layer enriched with particles. The predictions of the proposed electro-hydrodynamic model for …
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