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Published on: January 10, 2019
Spontaneous electrical charging of droplets by conventional pipetting
Dongwhi Choi1, Horim Lee, Do Jin Im
1Department of Mechanical Engineering, Pohang University of Science and Technology, San 31 Hyoja-dong, Nam-Gu, Pohang, Gyeongbuk, 790-784, South Korea.
Abstract:
We report that a droplet dispensed from a micropipette almost always has a considerable electrical charge of a magnitude dependent on the constituents of the droplet, on atmospheric humidity and on the coating material of pipette tip. We show that this natural electrification of a droplet originates from the charge separation between a droplet and pipette tip surface by contact with water due to the ionization of surface chemical groups. Charge on a droplet can make it difficult to detach the droplet from the pipette tip, can decrease its surface tension, can affect the chemical characteristics of solutions due to interactions with charged molecules, and can influence the combination and localization of charged bio-molecules; in all cases, the charge may affect results of experiments in which any of these factors is important. Thus, these findings reveal experimental parameters that should be controlled in experiments that use micropipettes.
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