Nanofluidique

Résumé

La nanofluidique est la branche de la nanophysique qui étudie les écoulements au contact d'objets dont au moins une des dimensions est inférieure à cent nanomètres. À cette échelle, de l'ordre de grandeur de celle des molécules qui le composent, le fluide est soumis à des contraintes qui n'existent pas aux échelles plus grandes et présente, en conséquence, un comportement spécifique. Les perspectives offertes par la découverte de phénomènes surprenants aux nanoéchelles promettent un bel avenir à cette branche de la science dont on ne connaît encore probablement qu'une infime partie. L'apparition, à l'échelle nanométrique, de phénomènes qui n'existent pas à des échelles plus grandes, est due à la compétition entre les effets de volume et les effets de surface. Notes et références Voir aussi Bibliographie

Eijkel, J. C. T. et van den Berg, 2005, Microfluid. Nanofluid. 1, 249.
Bocquet L. et Charlaix E., 2009, Nanofluidics, from bulk to interfaces,

Source officielle

https://fr.wikipedia.org/wiki/Nanofluidique

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Publications associées (27)

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Personnes associées (4)

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Cours associés (2)

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, ,

The understanding of the exact boundary conditions at the interface between a solid and a fluid is becoming increasingly important, as the limitations of the no-slip boundary condition are becoming apparent, especially in micro- and nanofluidics applications. We present a systematic study of controlled partial-slip boundary conditions in multiparticle collision dynamics simulations. By studying a plane Poiseuille flow, we demonstrate that, in general, the slip length of the fluid strongly depends on the microscopic dynamics in the vicinity of the solid surface. We empirically derive the dependence of the slip length on the properties of the MPC fluid and of the wall, and demonstrate that the wall slip in this coarse-grained simulation approach is linearly correlated with the flux of momentum across the fluid-solid interface.

Royal Soc Chemistry2013

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Electrostatically gated nanofluidic membranes: Technological developments and use of electrochemically polarizable materials

Stefano Silvio Giovanni Varricchio

Solid-state nanoporous membranes able to control ionic flows at the molecular level could have important applications in fields of research such as water filtration, nanomedicine, energy production, drug delivery, and bio-chemical analysis. The ability to dynamically control the surface charge and the electrical potential inside nanopores extends the range of applications from passive to active devices, such as nanofluidic transistors. In the first part of the thesis a new wafer-scale manufacturing method for solid-state nanoporous membranes based on casting of sacrificial templates is proposed. This way it is possible to individually define the position and geometry of every nanopore by design, independently from the materials used, whichmake this fabrication strategy adapted to the manufacturing of both passive and active nanofluidic devices. In the second part of the thesis this technology was used to fabricate electrostatically gated nanofluidic membranes with nanopores integrating polarizable electrodes made of amorphous carbon inside the nanochannels. Those membranes demonstrated the ability to modulate the ionic conductivity of the nanopores via the variation of the surface charge of the nanochannels with a sensitivity two-three orders of magnitude larger compared to nanochannels gated through metal-oxide electrodes.

EPFL2018

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We present a new fabrication method for solid-state nanoporous membranes based on sacrificial template structures made of silicon. The process consists of creating membranes by evaporating thin-films on sacrificial templates which, after their selective removal, opens the nanopores and releases the free-standing membranes. This way it is possible to define the geometry of the pore by design and to build the membrane by stacking thin-films of various materials through evaporation. Such a membrane with controlled porosity, pore geometry, thickness and nano-channel composition provides new opportunities for selective chemical functionalization, gating, electrical sensing or electrical stimulation inside the nanopore.

2015

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