Steric effects on electrokinetic flow of non-linear biofluids

Yazdi, Alireza Ahmadian; Sadeghi, Arman; Saidi, Mohammad Hassan

doi:10.1016/j.colsurfa.2015.08.018

Cited by 20 publications

(1 citation statement)

References 30 publications

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“…The ions, however, are of finite sizes and such an assumption may lead to significant errors when either the channel characteristic length is very small or the ionic concentration is high, especially at large surface potentials for which there will be a huge condensation of ions near the wall. [33][34][35][36][37][38][39][40][41][42][43][44][45][46] The importance of the ionic size (steric) effects is determined by the steric factor n which is the mean volume fraction of each ion in the bulk and is therefore given as n = a 3 n N . In this relationship, a denotes the effective ionic size and n N is the ionic concentration under neutral conditions.…”

Section: Introductionmentioning

confidence: 99%

Drastic alteration of diffusioosmosis due to steric effects

Hoshyargar

Ashrafizadeh

Sadeghi

2015

Phys. Chem. Chem. Phys.

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The inclusion of the ionic size (steric) effects into the steady and locally developed diffusioosmotic flow inside a uniformly charged slit microchannel through a theoretical analysis is the subject of this study. The results indicate essential quantitative and qualitative distinctions between the steric effects on classical electrokinetic phenomena like electroosmosis and on diffusioosmosis. For example, although the steric effect on electroosmotic flow is always unfavorable, it may have a positive influence on diffusioosmosis and even double the mean velocity under certain conditions. Moreover, finite ionic sizes can even change the flow direction with a tendency to increase the chance of flow toward higher concentrations. Another interesting finding is that, unlike electroosmosis, the steric effects on diffusioosmotic flow do not vanish even when the EDL is very thin. The main quantitative difference between the ionic size effects on diffusioosmosis and the other electrokinetic phenomena is the critical zeta potential above which these effects become important which is here found to be only about several tens of millivolts. The more sensitivity of diffusioosmosis to the steric effects and also the above-mentioned surprisingly different trends are attributed to the induced electric field which may drastically get influenced by the steric factor.

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Section: Introductionmentioning

confidence: 99%

Drastic alteration of diffusioosmosis due to steric effects

Hoshyargar

Ashrafizadeh

Sadeghi

2015

Phys. Chem. Chem. Phys.

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Simulation analysis of rectifying microfluidic mixing with field‐effect‐tunable electrothermal induced flow

et al. 2017

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We report herein field-effect control on in-phase electrothermal streaming from a theoretical point of view, a phenomenon termed "alternating-current electrothermal-flow field effect transistor" (ACET-FFET), in the context of a new technology for handing analytes in microfluidics. Field-effect control through a gate terminal endows ACET-FFET the ability to generate arbitrary symmetry breaking in the transverse vortex flow pattern, which makes it attractive for mixing microfluidic samples. A computational model is developed to study the feasibility of this new microfluidic device design for micromixing. The influence of various parameters on developing an efficient mixer is investigated, and an integrated layout of discrete electrode array is suggested for achieving high-throughput mixing. Our physical demonstration with field-effect electrothermal flow control using a simple electrode structure proves invaluable for designing active micromixers for modern micro total analytical system.

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Effects of finite ion size on transport of neutral solute across porous wall of a nanotube

Bhattacharjee

Dejam

2020

Theor. Comput. Fluid Dyn.

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Steric effects on electrokinetic flow of non-linear biofluids

Cited by 20 publications

References 30 publications

Drastic alteration of diffusioosmosis due to steric effects

Drastic alteration of diffusioosmosis due to steric effects

Simulation analysis of rectifying microfluidic mixing with field‐effect‐tunable electrothermal induced flow

Effects of finite ion size on transport of neutral solute across porous wall of a nanotube

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