The role of ion partitioning in electrohydrodynamic characteristics of soft nanofluidics: Inclusion of EDL overlap and steric effects

被引:16
作者
Reshadi, Milad [1 ]
Saidi, Mohammad Hassan [1 ]
机构
[1] Sharif Univ Technol, Sch Mech Engn, CEEC, Tehran 111559567, Iran
基金
美国国家科学基金会;
关键词
Ion partitioning effect; Electroviscous effect; Streaming potential; Electroosmosis; Electrophoresis; ELECTROKINETIC ENERGY-CONVERSION; GRAFTED POLYELECTROLYTE LAYERS; POISSON-BOLTZMANN EQUATION; SELF-ASSEMBLED MONOLAYERS; SOLID-STATE NANOCHANNELS; ELECTROPHORETIC MOBILITY; DIELECTRIC EXCLUSION; ELECTROOSMOTIC FLOW; IRREVERSIBLE-PROCESSES; ELECTROLYTE-SOLUTIONS;
D O I
10.1016/j.ces.2018.05.049
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In this paper, we aim to account for the partitioning of finite sized ions and electric double layer (EDL) overlapping effects on the electrostatics and hydrodynamics of soft nanofluidics by stablishing a modified Poisson-Boltzmann (MPB) equation enjoying mean field approach. The application of the present MPB equation enables us to describe the interaction between the steric effect and electrostatic repulsion of EDL ions due to permittivity difference of polyelectrolyte layer (PEL) and electrolyte solution. Utilizing the Debye-Huckel approximation pertinent to low surface potentials, we analytically derive the solutions of electric potential and velocity profiles of mixed electroosmotic and pressure driven flows in polyelectrolyte grafted nanotubes. As well, we theoretically predict the electrophoretic mobility of soft colloidal particles immersed in aqueous solutions of NaCl, KCl, NaMnO4 and LilO(3) in the presence of ion partitioning effect (IPE). For the case of larger surface potentials, the nonlinear governing equations of the problem are analyzed by finite difference method, and the accuracy of the numerical solutions are examined by verifying the results with existing experimental data. Moreover, we calculate three electrokinetically associated phenomena namely streaming potential, electroviscous effect and electro-chemomechanical energy conversion (ECMEC) efficiency through soft nanotube having constant surface potential/charge density. Then, we compare our results under the purview of the present MPB equation with those predicted by point-like charge modeling of ions. The essential findings of our investigation highlight the importance of accounting for IPE arising from the permittivity difference of PEL and bulk salt solution when high degrees of softness, charge density and thickness of the PEL are encountered in transport mechanism in soft nanofluidics. We also show that one of the most important consequences of IPE is several fold increase of electrophoretic mobility of soft particle and ECMEC efficiency of soft nanotube due to increasing the PEL-electrolyte permittivity difference. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:443 / 458
页数:16
相关论文
共 109 条
  • [1] Layer-by-Layer Assembly of Polyelectrolytes into Ionic Current Rectifying Solid-State Nanopores: Insights from Theory and Experiment
    Ali, Mubarak
    Yameen, Basit
    Cervera, Javier
    Ramirez, Patricio
    Neumann, Reinhard
    Ensinger, Wolfgang
    Knoll, Wolfgang
    Azzaroni, Omar
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2010, 132 (24) : 8338 - 8348
  • [2] A pH-Tunable Nanofluidic Diode with a Broad Range of Rectifying Properties
    Ali, Mubarak
    Ramirez, Patricio
    Mafe, Salvador
    Neumann, Reinhard
    Ensinger, Wolfgang
    [J]. ACS NANO, 2009, 3 (03) : 603 - 608
  • [3] Biosensing and Supramolecular Bioconjugation in Single Conical Polymer Nanochannels. Facile Incorporation of Biorecognition Elements into Nanoconfined Geometries
    Ali, Mubarak
    Yameen, Basit
    Neumann, Reinhard
    Ensinger, Wolfgang
    Knoll, Wolfgang
    Azzaroni, Omar
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (48) : 16351 - 16357
  • [4] [Anonymous], 2005, PHYSICOCHEMICAL HYDR
  • [5] Electrokinetics in nanochannels - Part I. Electric double layer overlap and channel-to-well equilibrium
    Baldessari, Fabio
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2008, 325 (02) : 526 - 538
  • [6] Giant augmentations in electro-hydro-dynamic energy conversion efficiencies of nanofluidic devices using viscoelastic fluids
    Bandopadhyay, Aditya
    Chakraborty, Suman
    [J]. APPLIED PHYSICS LETTERS, 2012, 101 (04)
  • [7] Influence of rigid core permittivity and double layer polarization on the electrophoresis of a soft particle: A numerical study
    Bhattacharyya, S.
    De, Simanta
    [J]. PHYSICS OF FLUIDS, 2016, 28 (01)
  • [8] Volumes and hydration warmth of ions
    Born, M
    [J]. ZEITSCHRIFT FUR PHYSIK, 1920, 1 : 45 - 48
  • [9] Streaming-field-induced convective transport and its influence on the electroviscous effects in narrow fluidic confinement beyond the Debye-Huckel limit
    Chakraborty, Suman
    Das, Siddhartha
    [J]. PHYSICAL REVIEW E, 2008, 77 (03):
  • [10] Streaming potential and electroviscous effects in soft nanochannels: towards designing more efficient nanofluidic electrochemomechanical energy converters
    Chanda, Sourayon
    Sinha, Shayandev
    Das, Siddhartha
    [J]. SOFT MATTER, 2014, 10 (38) : 7558 - 7568