scholarly journals Charging dynamics of electrical double layers inside a cylindrical pore: predicting the effects of arbitrary pore size

Soft Matter ◽  
2022 ◽  
Author(s):  
Filipe Henrique ◽  
Pawel J. Zuk ◽  
Ankur Gupta
Keyword(s):  
Transmission Line ◽  
Pore Size ◽  
Debye Length ◽  
Double Layers ◽  
Cylindrical Pore ◽  
Electrical Double Layers ◽  
Charging Dynamics

The effect of arbitrary pore size and Debye length on the charging dynamics of electrical double layers inside a cylindrical pore is computed, and its impact on capacitance, charging timescale, and transmission line circuit is highlighted.

scholarly journals Investigation on the Electrochemical Manipulation of Bio-Molecules in Glass Nanofluidic Channels

2015 ◽  
Vol 18 (4) ◽  
pp. 243-249
Author(s):  
Kun Liu ◽  
Ming Hao ◽  
Donghui Meng ◽  
Xujie Wan ◽  
Songwen Xiao ◽  
...  
Keyword(s):  
Debye Length ◽  
Microfluidic Channel ◽  
Double Layers ◽  
Etching Time ◽  
Advanced Technique ◽  
Ultraviolet Lithography ◽  
Nanofluidic Channels ◽  
Electrical Double Layers ◽  
Colloid Science ◽  
Fundamental Research

As the size of microfluidic channel further shrinks to nanometer, the dimension is approximate to biomolecules as well as Debye length (DL). Great deals of phenomena which do not exist in the usual world will appear. The overlapping of electrical double layers (EDL) in the channel and the increasing of the viscosity are such good examples. All of these phenomena lead to the fundamental research such as colloid science, transport process and micro/nanoscale hydrodynamics. It demands more advanced technique for micro/nanoscale design and fabrication as the channels downing to nanometer scale. In this work, molecular dynamics was adopted to calculate the transport of proteins and water molecules in nanofluidic channels. New methods of nanochannel fabrication were developed based on glass substrate. Glass nanochips were achieved via ultraviolet lithography and wet chemical etching. The channel depth could be adjusted by controlling the etching time. Finally the scanning electron microscope (SEM) and surface profiler were used to characterize the shape and surface morphology of the nanochannel in detail. This study presents the feasibility of such design and fabrication methods, which gives an interesting exploration for the application of nanofluidic technology.

Electrokinetics of polymeric fluids in narrow rectangular confinements

Soft Matter ◽  
2021 ◽  
Author(s):  
Aditya Natu ◽  
Uddipta Ghosh
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Double Layers ◽  
Polymeric Fluids ◽  
Polymeric Liquids ◽  
Electrical Double Layers

Flow of polymeric liquids in narrow confinements of rectangular cross section, in the presence of electrical double layers is analyzed here. Our analysis is motivated by the fact that many...

Molecular solvent models of electrical double layers

1991 ◽  
Vol 36 (11-12) ◽  
pp. 1677-1684 ◽  
Author(s):  
G.M. Torrie ◽  
G.N. Patey
Keyword(s):  
Double Layers ◽  
Electrical Double Layers ◽  
Solvent Models

Electroosmotic Flow in Hydrophobic Microchannels of General Cross Section

2015 ◽  
Vol 138 (3) ◽  
Author(s):  
Morteza Sadeghi ◽  
Arman Sadeghi ◽  
Mohammad Hassan Saidi
Keyword(s):  
Cross Section ◽  
Flow Rate ◽  
Electroosmotic Flow ◽  
Slip Length ◽  
Debye Length ◽  
Surface Hydrophobicity ◽  
Double Layers ◽  
Slip Conditions ◽  
Wall Boundary Conditions ◽  
Electroosmotic Velocity

Adopting the Navier slip conditions, we analyze the fully developed electroosmotic flow in hydrophobic microducts of general cross section under the Debye–Hückel approximation. The method of analysis includes series solutions which their coefficients are obtained by applying the wall boundary conditions using the least-squares matching method. Although the procedure is general enough to be applied to almost any arbitrary cross section, eight microgeometries including trapezoidal, double-trapezoidal, isosceles triangular, rhombic, elliptical, semi-elliptical, rectangular, and isotropically etched profiles are selected for presentation. We find that the flow rate is a linear increasing function of the slip length with thinner electric double layers (EDLs) providing higher slip effects. We also discover that, unlike the no-slip conditions, there is not a limit for the electroosmotic velocity when EDL extent is reduced. In fact, utilizing an analysis valid for very thin EDLs, it is shown that the maximum electroosmotic velocity in the presence of surface hydrophobicity is by a factor of slip length to Debye length higher than the Helmholtz–Smoluchowski velocity. This approximate procedure also provides an expression for the flow rate which is almost exact when the ratio of the channel hydraulic diameter to the Debye length is equal to or higher than 50.

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