论文标题
纳米尺度分辨率，摇摆棘轮中球形颗粒的多渠道分离，屏障高度增加
Nanometer scale resolution, multi-channel separation of spherical particles in a rocking ratchet with increasing barrier heights
论文作者
论文摘要
我们提出了一种基于纳米流体摇动的布朗尼电动机的纳米颗粒大小分离装置。它具有棘轮形的静电颗粒电势，沿粒子传输方向增加屏障高度。利用具有屏障高度的粒子电流的急剧下降，以将颗粒悬浮液分为多个子人群。通过求解fokker-planck方程，我们表明分离机制的物理学受棘轮正向倾斜下的能量格局的控制。因此，对于给定的设备几何形状和排序持续时间，施加力是增加分离分辨率的唯一可调参数。对于3.5 V施加电压和20 s排序的实验条件，我们预测分离分辨率为$ \ sim 2 $ nm，并由用于分离名义80和100 nm直径的球形金颗粒的实验数据支持。
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.
