Nanofluidic rocking Brownian motors

被引：109

作者：

Skaug, Michael J. ^{[1
]}

Schwemmer, Christian ^{[1
]}

Fringes, Stefan ^{[1
]}

Rawlings, Colin D. ^{[1
]}

Knoll, Armin W. ^{[1
]}

机构：

[1] IBM Res Zurich, CH-8803 Ruschlikon, Switzerland

来源：

SCIENCE | 2018年 / 359卷 / 6383期

基金：

欧洲研究理事会; 瑞士国家科学基金会;

关键词：

LATERAL DISPLACEMENT; THERMAL RATCHETS; NANO-OBJECTS; SEPARATION; PARTICLES; MOTION; FLUID; GLASS; DNA;

D O I：

10.1126/science.aal3271

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Control and transport of nanoscale objects in fluids is challenging because of the unfavorable scaling of most interaction mechanisms to small length scales. We designed energy landscapes for nanoparticles by accurately shaping the geometry of a nanofluidic slit and exploiting the electrostatic interaction between like-charged particles and walls. Directed transport was performed by combining asymmetric potentials with an oscillating electric field to achieve a rocking Brownian motor. Using gold spheres 60 nanometers in diameter, we investigated the physics of the motor with high spatiotemporal resolution, enabling a parameter-free comparison with theory. We fabricated a sorting device that separates 60-and 100-nanometer particles in opposing directions within seconds. Modeling suggests that the device separates particles with a radial difference of 1 nanometer.

引用

页码：1505 / 1508

页数：4

共 30 条

[1] Thermodynamics and kinetics of a Brownian motor [J].