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Liquid dispensing and writing in the extremely small size regime areimportant for applications in many current technologies, such as micro/nanofabrication, biological/chemical patterning and analysis, and drug discovery.Most of current dispensing/writing methods can be sorted into a category ofliquid flowing through tiny tubes or nozzles that requires inputting an impulseenergy, which leads to complex procedures, expensive equipment and narrowmaterial applicability, especially for biomaterials. Here, we report a methodthat may lead to a new category: liquid flows over the tapered surface of a pinwith longitudinal nano grooves on the surface to uninterruptedly performdroplet dispensing and direct writing. The dispensed droplet diameters werecontrollable from several microns down to 150 nm, and the written line heightswere as low as 5 nm. The mechanism underlying automatic liquid storage onconical surface and spontaneous liquid transport through nano grooves isrevealed and well modeled by a simple relationship. Furthermore, thenano-grooved pins are much simpler and cheaper in fabrication than nanoscaletubes and nozzles, and pins have much depressed clogging problems that aretypically troublesome for tubes and nozzles. Our new strategy may constitute abasis for creating liquid dispensing/writing technologies that aresimultaneously smaller, simpler, faster and applicable for more types ofmaterials.

Liquid dispensing and writing by a nano-grooved pin