Device for controlling particle distribution in an evaporating droplet using radial electroosmotic flow

摘要

The present invention provides a device comprising: a first field forming electrode formed around a droplet containing particles; And a second field-forming electrode fixed to the substrate, insulated from the electrode, and disposed at the center of the droplet. According to the present invention, by using a microelectrode system consisting of a circular electrode around the edge of a droplet and a bottom-center point electrode, a radial electroosmotic flow can be induced at the bottom surface of the droplet to produce a uniform solute distribution after complete evaporation. Can be. At this time, the radial electroosmotic flow changes in direction and intensity and is applied periodically over time. Particles used for homogenization are selected from the group consisting of polymers, organics, inorganics, metals, or biomolecules. , Or from the group consisting of negatively charged particles.