摘要:
A light induced dielectrophoresis (LIDEP) device is configured to perform a sorting process on a liquid including plural first micro-particles and plural second micro-particles. The LIDEP device includes a LIDEP chip and an opaque cartridge. The LIDEP chip includes a first electrode layer, a second electrode layer, a semiconductor layer, and a flow channel layer. The flow channel layer defines a first channel, a second channel and a third channel intersected at a confluence. The first channel is configured to guide the liquid. The flow channel layer further defines a projection region including the confluence. A patterned light source is projected on the projection region, thereby guiding the first micro-particles and the second micro-particles located within the confluence to move toward the second channel and the third channel, respectively. The opaque cartridge covers the LIDEP chip and has an opening. The vertical projection of the opening overlaps the projection region.
摘要:
An optically-induced dielectrophoresis device includes a first substrate, a first conductive layer, a first patterned photoconductor layer, a first patterned layer, a second substrate, a second conductive layer, and a spacer. The first conductive layer is disposed on the first substrate. The first patterned photoconductor layer is disposed on the first conductive layer. The first patterned layer is disposed on the first conductive layer. The first patterned photoconductor layer and the first patterned layer are distributed alternately over the first conductive layer. Resistivity of the first patterned photoconductor layer is not equal to resistivity of the first patterned layer. At least one of the first substrate and the second substrate is pervious to a light. The second conductive layer is disposed on the second substrate and between the first substrate and the second substrate. The spacer connects the first substrate and the second substrate.
摘要:
An apparatus and method for separating an analyte from a test sample, such as bacteria from blood components, based on their dielectric properties, localizing or condensing the analyte, flushing substantially all remaining waste products from the test sample, and detecting low concentrations of the analyte. Species movement is caused by a module array imparting opposing dielectrophoretic forces. The module array includes a plurality of microfluidic channels with connecting microfluidic waste channels for directing undesired material away from the analyte. An electric field is applied causing a positive dielectrophoretic force to the analyte to capture the analyte. The Clausius-Mossotti factor of the analyte is changed by flushing the analyte with a reference solution, which causes a negative dielectrophoretic force to facilitate release of the analyte. A field effect nanowire or nanoribbon sensor detects the analyte after capture.
摘要:
Systems and methods for trapping and moving individual particles of a target material of a suspension are disclosed. In one aspect, a system includes a tube and an electronically addressable float. The float includes one or more arrays of electrodes in which each electrode can be independently addressed to create non-uniform electric fields that trap and isolate target particles near the float. The electrodes can be dynamically operated to move the target particles to particular locations on the float for analysis and collection.
摘要:
A new microfluidic system comprising an automated prototype insulator-based dielectrophoresis (iDEP) triggering microfluidic device for pathogen monitoring that can eventually be run outside the laboratory in a real world environment has been used to demonstrate the feasibility of automated trapping and detection of particles. The system broadly comprised an aerosol collector for collecting air-borne particles, an iDEP chip within which to temporarily trap the collected particles and a laser and fluorescence detector with which to induce a fluorescence signal and detect a change in that signal as particles are trapped within the iDEP chip.
摘要:
Methods and relative devices are illustrated for generating time-variable electric fields suitable for determining the creation of closed dielectrophoretic cages able to trap inside even single particles without the cages being necessarily positioned at relative minimum points of the electric field.
摘要:
In a microfluidic device, respective motion of a plurality of objects along corresponding trajectories is achieved by determining a force field, such as an underlying fluid flow which, when applied to the plurality of object, moves each object along its corresponding trajectory. The force field is a linear superposition of a subset of all force fields supported by the physical characteristics of the microfluidic device. Once the fields have been ascertained, a plurality of actuation signals corresponding to the fields is applied to actuators installed on the microfluidic device to cause the force on each object. By implementing a feedback structure, corrections for positional errors may be made by computing a corrective force for each object and adjusting the actuation signals appropriately thereto.
摘要:
A method of removing particulate solids from an oil based drilling or completion fluid (1) is disclosed. The method involves exposing the fluid to an electric field to electrically migrate particulate solids suspended therein, and collecting the migrated particulate solids to remove them from the fluid.
摘要:
A novel apparatus and method is described for detection of very small quantities (a few hundred molecules) of bioparticles in nanoliter/picoliter quantities of a sample. The apparatus involves a very small and low cost apparatus that contains a fluorometer. The detection process uses the fluorescence of nanoparticles. Dielectrophoresis is used to concentrate, mix and position the target particles with regard to the light sensor such that maximum detection efficiency is achieved. This allows low cost implementation of low cost point of care tests for disease (animal and plant), infection, food-borne bacteria detection, nucleotide sequencing and pathogen detection (bioterrorism) in real world applications.
摘要:
A dielectrophoresis (DEP) apparatus including a concentration gradient generating unit, a method of separating a target material in a sample solution using the DEP apparatus, and a method of screening the optimum condition for separating a target material are provided.