纳米尺度分辨率，在具有增加的势垒高度的摇摆棘轮中多通道分离球形颗粒
Nanometer scale resolution, multi-channel separation of spherical particles in a rocking ratchet with increasing barrier heights
摘要：
我们提出了一种基于纳米流体摇摆布朗马达的纳米颗粒尺寸分离装置。它的特点是棘轮形的静电粒子的潜力与增加的势垒高度沿粒子输送方向。利用粒子电流随势垒高度的急剧下降将粒子悬浮液分离成多个亚群。通过求解Fokker-Planck方程，我们表明，分离机制的物理是由棘轮前倾下的能量景观。对于给定的装置几何形状和分选持续时间，所施加的力因此是增加分离分辨率的唯一可调参数。对于3.5 V的施加电压和20 s的分选的实验条件下，我们预测的分离分辨率为$\sim 2$ nm，由实验数据支持的标称80和100 nm直径的球形金颗粒分离。
英文摘要：
We present a nanoparticle size-separation device based on a nanofluidic rocking Brownian motor. It features a ratchet-shaped electrostatic particle potential with increasing barrier heights along the particle transport direction. The sharp drop of the particle current with barrier height is exploited to separate a particle suspension into multiple sub-populations. By solving the Fokker--Planck equation, we show that the physics of the separation mechanism is governed by the energy landscape under forward tilt of the ratchet. For a given device geometry and sorting duration, the applied force is thus the only tunable parameter to increase the separation resolution. For the experimental conditions of 3.5 V applied voltage and 20 s sorting, we predict a separation resolution of $\sim 2$ nm, supported by experimental data for separating spherical gold particles of nominal 80 and 100 nm diameters.
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