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首页> 外文会议>American Society of Mechanical Engineers(ASME) Integrated Nanosystems Conference: Design, Synthesis, and Applications(NANO 2004); 20040922-24; Pasadena,CA(US) >TRANSPORT PHENOMENA IN NANOFLUIDIC CHANNELS
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TRANSPORT PHENOMENA IN NANOFLUIDIC CHANNELS

机译：纳米流体通道中的运输现象

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摘要

Ion transport in nanoscale channels has recently received increasing attention. Much of that has resulted from experiments that report modulation of ion transport through the protein ion channel, α-hemolysin, due to passage of single biomolecules of DNA or proteins. This has prompted research towards fabricating synthetic nanopores out of inorganic materials and studying biomolecular transport through them. Recently, the synthesis of arrays of silica nanotubes with internal diameters in the range of 5-100 nm and with lengths 1-20 μm was reported. These tubes could potentially allow new ways of detecting and manipulating single biomolecules and new types of devices to control ion transport. Theoretical modeling of ionic distribution and transport in silica nanotubes, 30 nm in diameter and 5 μm long, suggest that when the diameter is smaller than the Debye length, a unipolar solution of counterions is created within the nanotube and the coions are electrostatically repelled. We proposed two different types of devices to use this unipolar nature of solution, i.e. 'transistor' and 'battery'. When the electric potential bias is applied at two ends of a nanotube, ionic current is generated. By locally modifying the surface charge density through a gate electrode, the concentration of counterions can be depleted under the gate and the ionic current can be significantly suppressed. This could form the basis of a unipolar ionic field-effect transistor. By applying the pressure bias instead of electric potential bias, the fluid flow is generated. Because only the counterions are located inside the channel, the streaming current and streaming potential are generated. This could form the basis of an electro-chemo-mechanical battery. In the present study, transport phenomena in nanofluidic channels were investigated and the performance characteristics were evaluated using continuum dynamics.
机译：纳米通道中的离子传输最近受到越来越多的关注。大多数是由于实验的结果，该实验报告了由于DNA或蛋白质的单个生物分子通过而调节了通过蛋白质离子通道α-溶血素的离子运输的调节。这促使人们进行研究，以利用无机材料制造合成纳米孔，并研究通过它们的生物分子运输。最近，报道了内径在5-100nm范围内且长度在1-20μm的二氧化硅纳米管阵列的合成。这些管可能潜在地提供检测和操纵单个生物分子的新方法以及控制离子传输的新型设备。直径为30 nm，长度为5μm的二氧化硅纳米管中离子分布和迁移的理论模型表明，当直径小于Debye长度时，会在纳米管内产生抗衡离子的单极性溶液，并且将阳离子静电排斥。我们提出了两种不同类型的设备来使用这种单极性解决方案，即``晶体管''和``电池''。当在纳米管的两端施加电势偏压时，产生离子电流。通过通过栅电极局部改变表面电荷密度，可以在栅之下耗尽抗衡离子的浓度，并且可以显着抑制离子电流。这可以构成单极离子场效应晶体管的基础。通过施加压力偏置而不是电势偏置，产生了流体流。由于仅抗衡离子位于通道内部，因此会生成流电流和流电势。这可以构成电化学电池的基础。在本研究中，研究了纳米流体通道中的传输现象，并使用连续介质动力学评估了性能特征。

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