In the approach, aqueous microdroplets (composed of either deionized water, glycerin solution, normal ink solution, phosphate buffer solution, or NaCl solutions) were released onto a c-cut Fe-doped lithium niobate (LN) crystal using oil and an emulsifying agent called Span 80. A 473-nm laser was then used to excite electrons from Fe^2+/3+ traps in the crystal. When the laser illumination was applied to a microdroplet, the droplet elongated before lifting off and finally moving away from the LN surface (pictured). The effect is due to excess charge accumulation at the interface between the LN surface and the microdroplet.

中文翻译：

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微滴操控

在该方法中，使用油和乳化剂将水性微滴（由去离子水、甘油溶液、普通墨水溶液、磷酸盐缓冲溶液或氯化钠溶液组成）释放到 c 形切割的铁掺杂铌酸锂 (LN) 晶体上称为 Span 80。然后使用 473 nm 激光从晶体中的Fe ^2+/3+陷阱激发电子。当激光照射到微滴上时，微滴在升起并最终远离液氮表面之前会拉长（如图）。该效应是由于液氮表面和微滴之间的界面处的过量电荷积累造成的。