Patent ID: 8470570

Claim:
An apparatus for printing a biomolecular droplet onto a substrate using an electric charge concentration effect, the apparatus comprising: an electric field forming electrode which comprises an accommodating area in which a biomolecular droplet comprising micro magnetic beads and biomolecules is accommodated and a nozzle formed on an end of the accommodating area through which the biomolecular droplet is discharged; a grounded substrate disposed below the electric field forming electrode, which comprises a target surface onto which the biomolecular droplet discharged from the nozzle of the electric field forming electrode is deposited; a magnet disposed below the substrate which applies a magnetic force on the micro magnetic beads; and an open circuit type voltage applying unit electrically connected to the electric field forming electrode which applies a charge to the electric field forming electrode which generates an electrical force which causes the biomolecular droplet to be ejected onto the target surface of the substrate due to a force generated by the charge in the electric field forming electrode and a charge induced on the substrate by the charge in the electric field forming electrode, wherein the biomolecular droplet suspended from the nozzle is tapered and has a lower portion with reduced width in which micro magnetic beads are concentrated with the biomolecules at a lowest point in the biomolecular droplet, and has a smaller size and volume, than that of a biomolecular droplet without micro magnetic beads, and wherein the biomolecular droplet so printed on a substrate has a smaller size than that of a biomolecular droplet printed without micro magnetic beads.