It is well known that solute usually carries out non-uniform deposition when deposited from evaporating droplet. In this study, the evaporation behavior of volatile micro droplets with nanoliter volume has been modeled and experimented in detail to insight this phenomenon. The results showed that there are two phases (I: constant baseline region in first 50% of total time, II: constant contact-angle region in the later 50% of total time) existing during the whole evaporation of water droplets. Average volume rate of evaporation is -1.66nl/s for initial baseline of 2.27mm during 2160seconds. Furthermore, the evaporation experiment performed in circular nanoliter wells of 65 μm high and diameters ranging from 240μm to 1270μm demonstrated that the moving speeds of thin water film during rupture ranged from 20μm/s to 25μm/s, circular wells of larger size carried out, higher initial broken percentage. This study will be beneficial to the design of microstuctures for uniform solute deposition from the evaporation of liquid droplets.
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机译：众所周知，当沉积蒸发液滴时，溶质通常在沉积时进行不均匀的沉积。在该研究中，挥发性微液滴具有纳米液体积的蒸发行为已经详细建模和实验，以实现这一现象。结果表明，在整个蒸发过程中，II阶段有两相（I：在总时间的总时间的前50％的恒定基线区域，II：恒定的50％的恒定接触角区域）存在于水滴的整个蒸发过程中。初始基线的平均蒸发量为-1.66nl / s 2.27mm期间2160秒。此外，在65μm高的圆形纳米孔孔中进行的蒸发实验，直径为240μm至1270μm，证明了破裂期间的薄水膜的移动速度范围为20μm/ s至25μm/ s，圆形井进行，更高的初始损坏百分比。该研究将对微压设计用于均匀溶质沉积从液滴的蒸发的设计。
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