Entropic electrokinetics: recirculation, particle separation, and negative mobility
We show that when particles are suspended in an electrolyte confined between corrugated charged surfaces, electrokinetic flows lead to a new set of phenomena such as particle separation, mixing for low-Reynolds micro- and nanometric devices, and negative mobility. Our analysis shows that such phenom...
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| Veröffentlicht in: | Physical review letters 2014-09, Vol.113 (12), p.128301-128301, Article 128301 |
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| container_end_page | 128301 |
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| container_issue | 12 |
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| container_title | Physical review letters |
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| creator | Malgaretti, Paolo Pagonabarraga, Ignacio Rubi, J Miguel |
| description | We show that when particles are suspended in an electrolyte confined between corrugated charged surfaces, electrokinetic flows lead to a new set of phenomena such as particle separation, mixing for low-Reynolds micro- and nanometric devices, and negative mobility. Our analysis shows that such phenomena arise, for incompressible fluids, due to the interplay between the electrostatic double layer and the corrugated geometrical confinement and that they are magnified when the width of the channel is comparable to the Debye length. Our characterization allows us to understand the physical origin of such phenomena, therefore, shedding light on their possible relevance in a wide variety of situations ranging from nano- and microfluidic devices to biological systems. |
| doi_str_mv | 10.1103/physrevlett.113.128301 |
| format | Article |
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Our analysis shows that such phenomena arise, for incompressible fluids, due to the interplay between the electrostatic double layer and the corrugated geometrical confinement and that they are magnified when the width of the channel is comparable to the Debye length. 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Our analysis shows that such phenomena arise, for incompressible fluids, due to the interplay between the electrostatic double layer and the corrugated geometrical confinement and that they are magnified when the width of the channel is comparable to the Debye length. 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| source | MEDLINE; American Physical Society Journals; Recercat |
| subjects | Channels Corrugating Devices Double layer Electrokinetics Electrolytes Electrolytes - chemistry Entropy Experiments Física de partícules Ion Channels - chemistry Ions - chemistry Kinetic theory of matter Kinetics Microfluidic Analytical Techniques Models, Chemical Nanostructure Particle physics Separation Static Electricity Teoria cinètica de la matèria |
| title | Entropic electrokinetics: recirculation, particle separation, and negative mobility |
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