一种用于盐水的光电微泵
An Opto-Electric Micropump for Saline Fluids
摘要：
介绍了一种在实验室芯片上实现流体泵送的新方法，泵送速度可达几十微米/秒。聚焦的激光束局部加热电解质。由于在存在温度梯度的情况下正离子和负离子移动的不相等趋势，净电荷倾向于在吸热区域中积累。然后，外部电场对积累的电荷施加净力，从而对水施加净力。对于简单的NaCl+水溶液，这导致水以高达每秒数十微米的速度流动。该方法可以让我们改变方向和流体泵送量，只需更换焦点区域。
英文摘要：
A novel method to pump fluid in lab on chip devices with velocities up to tens of micrometer per second is introduced. A focused laser beam locally heats up an electrolyte. A net charge tends to accumulate in the heat-absorbing area, due to unequal tendencies of positive and negative ions to move in the presence of the temperature gradient. An external electric field then exerts a net force on the accumulated charge and consequently on water. This causes flow of water, with velocities up to tens of micrometer per second, for a simple NaCl+water solution. The method lets us change direction and amount of fluid pumping, simply by replacing the focal area.
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