▎ 摘　　要

Systems capable of remote handling of liquids in individual microdroplets are of great importance for both technological applications and fundamental studies. Here, we demonstrate the fabrication of a hydrophobic bilayer membrane that can be operated through electrical potential and infrared (IR) light to pick up and drop off liquids in the microliter regime with an accuracy of 5 X 10(-8) L. The weights of the microdroplet picked up by the U-shaped electrical actuator of the reduced graphene oxide (r-GO)/agar bilayer membrane are controlled by varying parameters like the surface tension of the liquid, contact angle of the solid surface, and applied voltage. The wettability of the reduced graphene oxide (r-GO) fraction of the r-GO/agar bilayer membrane is regulated via tuning of the surface roughness by sandwiching different amounts of gold nanoparticles (AuNP). Rapid mixing of liquids caused by the abrupt breaking of the droplets led to ultrafast chemical reactions in the microliter length scale. The r-GO/agar-based electrical arm can also be used to perform routine chemical analyses like acid-base titration in a fast, easy, and chemical-efficient manner.