Journal
SCIENCE
Volume 359, Issue 6383, Pages 1505-1508Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal3271
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Funding
- European Research Council [307079]
- European Commission [FP7-ICT-2011-8, 318804]
- Swiss National Science Foundation [200020-144464]
- Swiss National Science Foundation (SNF) [200020_144464] Funding Source: Swiss National Science Foundation (SNF)
- European Research Council (ERC) [307079] Funding Source: European Research Council (ERC)
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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.
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