Borromeo Marcello, Marchesoni Fabio
Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy.
Phys Rev Lett. 2007 Oct 12;99(15):150605. doi: 10.1103/PhysRevLett.99.150605.
Brownian motion on a symmetric vibrated periodic substrate is shown to be extremely sensitive to the particle mass even in the regime of large damping. This phenomenon is the most apparent for high vibration frequencies, a condition of technological interest, which is investigated here both analytically and numerically. When plotted versus the damping constant, both the particle mobility and the diffusion coefficient develop sharp (correlated) peaks, thus suggesting efficient schemes for separating submicron particles according to their mass or geometry.
研究表明，即使在大阻尼状态下，对称振动周期性基底上的布朗运动对粒子质量也极为敏感。这种现象在高振动频率下最为明显，而高振动频率是一个具有技术意义的条件，本文对此进行了分析和数值研究。当绘制粒子迁移率和扩散系数与阻尼常数的关系图时，二者都会出现尖锐的（相关）峰值，这表明可以根据亚微米粒子的质量或几何形状制定有效的分离方案。
