摘要:
A method of printing droplets using capillary electric charge concentration includes: providing a capillary nozzle comprising a back-end part and a front-end part disposed substantially opposite the back-end part; spacing a target member apart from the front-end part of the capillary nozzle at a predetermined distance; immersing the back-end part in a solution; and supplying a voltage to the solution. The back-end part transmits the solution to the front-end part.
摘要:
Disclosed is an apparatus and method for ejecting droplets using charge concentration and liquid bridge breakup. The droplet ejection apparatus includes a reservoir storing a liquid; a capillary nozzle having a lower end submerged in the liquid stored in the reservoir and an upper end exposed outside the surface of the liquid, the capillary nozzle transferring the liquid to the upper end using capillary force; a potentiostat for applying a voltage to the liquid; a substrate mount on which a substrate is disposed to face the upper end of the capillary nozzle; and a distance adjusting unit for reciprocatingly moving the substrate between first and second positions with respect to the capillary nozzle, wherein the first position denotes a position where a distance between the upper end of the capillary nozzle and the surface of the substrate is less than a effective distance.
摘要:
Disclosed is an apparatus and method for ejecting droplets using charge concentration and liquid bridge breakup. The droplet ejection apparatus includes a reservoir storing a liquid; a capillary nozzle having a lower end submerged in the liquid stored in the reservoir and an upper end exposed outside the surface of the liquid, the capillary nozzle transferring the liquid to the upper end using capillary force; a potentiostat for applying a voltage to the liquid; a substrate mount on which a substrate is disposed to face the upper end of the capillary nozzle; and a distance adjusting unit for reciprocatingly moving the substrate between first and second positions with respect to the capillary nozzle, wherein the first position denotes a position where a distance between the upper end of the capillary nozzle and the surface of the substrate is less than a effective distance.
摘要:
A device for printing a droplet onto a substrate includes: a droplet generating member which is needle-shaped and comprises a receiving portion disposed vertically to receive a solution, and a discharge hole connected to the receiving portion and formed on a bottom of the receiving portion so that the solution can be discharged from the receiving portion; a substrate disposed below the droplet generating member, the substrate includes a target portion to which the droplet discharged from the discharge hole of the droplet generating member is dropped and attached; a voltage applier applying a voltage to the droplet so that the droplet can be dropped onto the target portion of the substrate; a volume measuring unit measuring the volume of the droplet; and a droplet control unit maintaining the volume of the droplet at a predetermined level based on the measured volume of the droplet.
摘要:
Provided is a microfluidic valve, a method of manufacturing the microfluidic valve, and a microfluidic device that employs the microfluidic valve. The microfluidic valve includes a platform that includes two substrates combined facing each other; a channel having a first depth allowing a fluid to flow between the two substrates; a valve gap that is disposed on at least a region of the channel and has a second depth which is smaller than the first depth; and a valve plug that is disposed to fill the valve gap and is formed of a valve material made by mixing a phase change material, which is solid at room temperature, with a plurality of exothermic particles that emit an amount of heat sufficient to melt the phase change material by absorbing electromagnetic waves.
摘要:
A centrifugal force based microfluidic device including a thermal activation unit, a microfluidic system including the same, and a method of operating the microfluidic system are provided. The thermal activation unit accompanies a temperature change in order to carry out its functions and having heat generation particles that absorb electromagnetic waves and generate heat in the activation unit therein.
摘要:
A centrifugal micro fluidic system and a centrifugal magnetic position control device used in the centrifugal micro fluidic system for controlling the position of magnetic beads are provided. The centrifugal micro fluidic system comprising, a rotatable platform; a micro fluidic structure which is disposed in the platform; and a plurality of objects which include functional groups on surfaces thereof so as to capture a target material from the fluid and carry the target material while being suspended in and separated from the fluid in the micro fluidic structure, wherein the movements of the objects are controlled by a force affecting the objects differently compared to the force's effect on the fluid. When the objects are made of a magnetic material, the force may be a magnetic force applied by the centrifugal magnetic position control device.
摘要:
Provided is a rotatable microfluidic device for conducting simultaneously two or more assays. The device includes a platform which can be rotated, a first unit which is disposed at one portion of the platform and detects a target material from a sample using surface on which a capture probe selectively binds to the target material is attached, and a second unit which is disposed at another portion of the platform and detects a target material included in the sample by a different reaction from the reaction conducted in the first unit.
摘要:
Provided is a rotatable disc-shaped microfluidic device which can electrochemically detect electrolytes comprised in a specimen. The microfluidic device including: a specimen chamber which accommodates a specimen; a detection chamber which receives the specimen from the specimen chamber; and an ion sensor which is formed in the detection chamber to electrochemically detect electrolytes in the specimen and includes an indicator electrode, a standard electrode and an ion selective film formed on a portion of the indicator electrode. The standard specimen is accommodated in the detection chamber, and a standard potential is measured. Then, the specimen is accommodated in the detection chamber, and a measurement potential is obtained to detect the concentration of the electrolytes comprised in the specimen.
摘要:
Provided is a rotatable disc-shaped microfluidic device which can electrochemically detect electrolytes comprised in a specimen. The microfluidic device including: a specimen chamber which accommodates a specimen; a detection chamber which receives the specimen from the specimen chamber; and an ion sensor which is formed in the detection chamber to electrochemically detect electrolytes in the specimen and includes an indicator electrode, a standard electrode and an ion selective film formed on a portion of the indicator electrode. The standard specimen is accommodated in the detection chamber, and a standard potential is measured. Then, the specimen is accommodated in the detection chamber, and a measurement potential is obtained to detect the concentration of the electrolytes comprised in the specimen.