设计并制作了一种y型无电场电渗泵芯片,以聚电解质静电自组装技术在侧臂通道分别修饰正、负电荷形成电渗泵,实现中间主通道无电场干扰。侧臂由多个平行亚通道构成,以增强电渗泵流速。使用中性离子示踪法、毛细管法分别测定电渗泵流速与压强,考察了电场、亚通道个数及深度对流速与压强的影响。结果表明,流速、压强随外加电场增大而增大,并呈线性关系;流速随侧臂亚通道个数增大而增大,压强随通道深度减小而增大。当电场强度为600V/CM时,含9个深10μM、宽度25μM亚通道的电渗泵流速与压强分别为672nl/MIn和442PA。A novel Y-shaped electro-osmotic pump consisting of two arms which has small sub-channels in parallel was developed.Two arm-channels were modified with cationic and anio-nic polyelectrolyte respectively,allowing a field-free flow to be generated in main-channel.Flow rate and pressure were measured by particle tracking and capillary method respectively,and the influence of electric field, numbers and depth of sub-channel on flow rate and pressure was investigated as well.Results showed that both of flow rate and pumping pressure increased linearly with electric field.As the number of subchannels increases,the flow rate becomes higher by increasing the cross-sectional area at a constant electric field.Meanwhile,the pressure falls as depth of sub-channel increases.Flow rate and pumping pressure were 672nL/min and 442Pa respectively for the pump with 9 sub-channels(10am deep、25μm wide)in parallel,when electric field was 600V/cm.国家自然科学基金面上项目20675066;国家基础科学人才培养基金J0630429项目资
