论文标题
昆虫模拟微流体设备中的频率特异性流量控制
Frequency-specific, valveless flow control in insect-mimetic microfluidic devices
论文作者
论文摘要
便宜的,便携式实验室的芯片设备将彻底改变环境监测和全球健康等领域,但是当前的微流体芯片已束缚到广泛的外芯片硬件。然而,昆虫是使用很大程度上未探索的方法在微观上进行独立且熟练地操纵流体的。我们制造了一系列的微流体设备,这些设备模仿了通过同步加速器放射成像观察到的昆虫呼吸运动学的关键特征,包括响应单个波动压力信号的多个呼吸道部分的崩溃。在一个单通道设备中,流速和方向可以仅由无动频率控制,而无需使用内部阀。此外,我们制造了多通道芯片,其单个通道有选择地响应单个全局驱动频率,其各个通道有选择地响应(具有变量,频率的流速或OFF)。我们的结果表明,昆虫模拟设计有可能大幅度减少微流体芯片的驱动开销,并且昆虫呼吸系统可能与阻抗不匹配的泵共享特征。
Inexpensive, portable lab-on-a-chip devices would revolutionize fields like environmental monitoring and global health, but current microfluidic chips are tethered to extensive off-chip hardware. Insects, however, are self-contained and expertly manipulate fluids at the microscale using largely unexplored methods. We fabricated a series of microfluidic devices that mimic key features of insect respiratory kinematics observed by synchrotron-radiation imaging, including the collapse of portions of multiple respiratory tracts in response to a single fluctuating pressure signal. In one single-channel device, the flow rate and direction could be controlled by the actuation frequency alone, without the use of internal valves. Additionally, we fabricated multichannel chips whose individual channels responded selectively (on with a variable, frequency-dependent flow rate, or off) to a single, global actuation frequency. Our results demonstrate that insect-mimetic designs have the potential to drastically reduce the actuation overhead for microfluidic chips, and that insect respiratory systems may share features with impedance-mismatch pumps.