Transport and dispersion across wiggling nanopores

Marbach, Sophie; Dean, David S.; Bocquet, Lydéric

doi:10.1038/s41567-018-0239-0

Cited by 98 publications

(118 citation statements)

References 45 publications

(36 reference statements)

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“…The surface aromatic rings can only move in groups inducing three dimensional vibrations to their neighbouring carbons. Notably, similar vibrations and shape agitations were observed on the atoms and surfaces of artificial and biological porins [44,45].…”

Section: Resultssupporting

confidence: 56%

“…They are used regularly to predict how these compounds behave either when they are solvent exposed to membrane substrates or embedded in bilayer environments and polymer matrices [36][37][38][39][40]. Today, CNTs are compared to biological porins and biomimetic (artificial) water channels which undergo structural deformations such as spatial variations of the pore size and shape [41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics of Water Embedded Carbon Nanocones: Surface Waves Observation

et al. 2019

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We employed molecular dynamics simulations on the water solvation of conically shaped carbon nanoparticles. We explored the hydrophobic behaviour of the nanoparticles and investigated microscopically the cavitation of water in a conical confinement with different angles. We performed additional molecular dynamics simulations in which the carbon structures do not interact with water as if they were in vacuum. We detected a waving on the surface of the cones that resembles the shape agitations of artificial water channels and biological porins. The surface waves were induced by the pentagonal carbon rings (in an otherwise hexagonal network of carbon rings) concentrated near the apex of the cones. The waves were affected by the curvature gradients on the surface. They were almost undetected for the case of an armchair nanotube. Understanding such nanoscale phenomena is the key to better designed molecular models for membrane systems and nanodevices for energy applications and separation.

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Section: Resultssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics of Water Embedded Carbon Nanocones: Surface Waves Observation

et al. 2019

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“…Osmosis across dynamically stimulated pores is therefore a subtle problem, which requires proper microscopic foundations. Beyond the fundamental question, adding the sieving frequency as a new tuning parameter may improve separation and selectivity properties of the membranes 158,159 . Representation of the spatiotemporal motion of grafted phenylalanine-glycine nucleoporins (FG-Nups) inside the selectivity filter of the nuclear pore complex.…”

Section: Towards Active Osmosismentioning

confidence: 99%

Osmosis, from molecular insights to large-scale applications

2019

Self Cite

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Osmosis is a universal phenomenon occurring in a broad variety of processes and fields. It is the archetype of entropic forces, both trivial in its fundamental expression -the van 't Hoff perfect gas law -and highly subtle in its physical roots. While osmosis is intimately linked with transport across membranes, it also manifests itself as an interfacial transport phenomenon: the so-called diffusio-osmosis and -phoresis, whose consequences are presently actively explored for example for the manipulation of colloidal suspensions or the development of active colloidal swimmers. Here we give a global and unifying view of the phenomenon of osmosis and its consequences with a multi-disciplinary perspective. Pushing the fundamental understanding of osmosis allows one to propose new perspectives for different fields and we highlight a number of examples along these lines, for example introducing the concepts of osmotic diodes, active separation and far from equilibrium osmosis, raising in turn fundamental questions in the thermodynamics of separation. The applications of osmosis are also obviously considerable and span very diverse fields. Here we discuss a selection of phenomena and applications where osmosis shows great promises: osmotic phenomena in membrane science (with recent developments in separation, desalination, reverse osmosis for water purification thanks in particular to the emergence of new nanomaterials); applications in biology and health (in particular discussing the kidney filtration process); osmosis and energy harvesting (in particular, osmotic power and blue energy as well as capacitive mixing); applications in detergency and cleaning, as well as for oil recovery in porous media.to counteract the flow: the applied pressure is then equal to the osmotic pressure. solute semi-permeable membrane hydrostatic pressure drop relaxation Fig. 1 : Key manifestation of osmosis. A semi-permeable membrane allows transport of water upon a solute concentration difference (in red). The flow of water is directed from the fresh water reservoir to the concentrated reservoir.Osmosis is therefore extremely simple in its expression. Yet it is one of the most subtle physics phenomenon in its roots -it resulted in many debates over years 1,2 . Osmosis also implies subtle J o u r n a l N a me , [ y e a r ] , [ v o l . ] , 1-43 | 1 arXiv:1902.06219v2 [cond-mat.soft] 6 May 2019 2 | 1-43 J o u r n a l N a me , [ y e a r ] , [ v o l . ] , .Noting then that for small pressure drops, µ w (T, p (r) , 0)0) the molec-J o u r n a l N a me , [ y e a r ] , [ v o l . ] , 1-43 | 3where L hyd = κ hyd A /(ηL) is the solvent permeance through the 4 | 1-43 J o u r n a l N a me , [ y e a r ] , [ v o l . ] , 6 | 1-43 J o u r n a l N a me , [ y e a r ] , [ v o l . ] ,

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“…Our instrument can be used to measure tracer diffusion in confined liquids besides water, in particular of liquid electrolytes or lubricants. It can also be used for experimental testing of recent calculations to describe the diffusion in confined liquids with rough or patterned confining walls 46,47 .…”

Section: Resultsmentioning

confidence: 99%

A new method for measurement and quantification of tracer diffusion in nanoconfined liquids

Ajith

Patil

2020

Review of Scientific Instruments

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We report development of a novel instrument to measure tracer diffusion in water under nano-scale confinement. A direct optical access to the confinement region, where water is confined between a tapered fiber and a flat substrate, is made possible by coating the probe with metal and opening a small aperture( 0.1 µm to 1 µm) at its end. A well-controlled cut using an ion beam ensures desired lateral confinement area as well as adequate illumination of the confinement gap. The probe is mounted on a tuning-fork based force sensor to control the separation between the probe and the substrate with nm precision. Fluctuations in fluorescence intensity due to diffusion of a dye molecule in water confined between probe and the sample are recorded using a confocal arrangement with a single photon precision. A Monte-Carlo method is developed to determine the diffusion coefficient from the measured autocorrelation of intensity fluctuations which accommodates the specific geometry of confinement and the illumination profile. The instrument allows measurement of diffusion laws under confinement. We found that the diffusion of a tracer molecule is slowed down by more than ten times for the probe-substrate separations of 5 nm and below.

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Transport and dispersion across wiggling nanopores

Cited by 98 publications

References 45 publications

Molecular Dynamics of Water Embedded Carbon Nanocones: Surface Waves Observation

Molecular Dynamics of Water Embedded Carbon Nanocones: Surface Waves Observation

Osmosis, from molecular insights to large-scale applications

A new method for measurement and quantification of tracer diffusion in nanoconfined liquids

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