A coupled effect of dehydration and electrostatic interactions on selective ion transport through charged nanochannels

Nanoscale ◽  
2018 ◽  
Vol 10 (39) ◽  
pp. 18821-18828 ◽  
Author(s):  
Mao Wang ◽  
Wenhao Shen ◽  
Siyuan Ding ◽  
Xue Wang ◽  
Zhong Wang ◽  
...  
Keyword(s):  
Ion Transport ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Electrostatic Interactions ◽  
Ion Selectivity ◽  
Coupled Effect

The interplay between dehydration and electrostatic interactions leads to a switch in ion selectivity in nanochannels as the surface charge density increases.

Graphene quantum dots/graphene fiber nanochannels for osmotic power generation

2019 ◽  
Vol 7 (41) ◽  
pp. 23727-23732 ◽  
Author(s):  
Ki Hyun Lee ◽  
Hun Park ◽  
Wonsik Eom ◽  
Dong Jun Kang ◽  
Sung Hyun Noh ◽  
...  
Keyword(s):  
Power Generation ◽  
Quantum Dots ◽  
Ion Transport ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Ion Selectivity ◽  
High Surface ◽  
Graphene Quantum Dots ◽  
High Surface Charge Density

Graphene quantum dots were intercalated into graphene fiber nanochannel as a nano-charger for high surface charge density. The hybrid nanochannel shows efficient ion transport behaviors and ion selectivity facilitating superior osmotic power generation.

An ion-gating multinanochannel system based on a copper-responsive self-cleaving DNAzyme

2016 ◽  
Vol 52 (65) ◽  
pp. 10020-10023 ◽  
Author(s):  
Yang Chen ◽  
Di Zhou ◽  
Zheyi Meng ◽  
Jin Zhai
Keyword(s):  
Ion Transport ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density

An ion-gating nanochannel system was built by immobilizing a Cu2+-responsive self-cleaving DNAzyme, which could control the ion transport by regulating the surface charge density of the channels.

Quantification of the electrostatic properties of the glomerular filtration barrier modeled as a charged fiber matrix separating anionic from neutral Ficoll

2013 ◽  
Vol 304 (6) ◽  
pp. F781-F787 ◽  
Author(s):  
Carl M. Öberg ◽  
Bengt Rippe
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Glomerular Filtration ◽  
Surface Charge Density ◽  
Electrostatic Interactions ◽  
The Body ◽  
Electrical Charge ◽  
Glomerular Filtration Barrier ◽  
Filtration Barrier ◽  
Fiber Matrix

In the current study we explore the electrostatic interactions on the transport of anionic Ficoll (aFicoll) vs. neutral Ficoll (nFicoll) over the glomerular filtration barrier (GFB) modeled as a charged fiber matrix. We first analyze experimental sieving data for the rat glomerulus, and second, we explore some of the basic implications of a theoretical model for the electrostatic interactions between a charged solute and a charged fiber-matrix barrier. To explain the measured difference in glomerular transport between nFicoll and aFicoll (Axelsson J, Sverrisson K, Rippe A, Fissell W, Rippe B. Am J Physiol 301: F708–F712, 2011), the present simulations demonstrate that the surface charge density needed on a charged fiber matrix must lie between −0.005 C/m2 and −0.019 C/m2, depending on the surface charge density of the solute. This is in good agreement with known surface charge densities for many proteins in the body. In conclusion, the current results suggest that electrical charge makes a moderate contribution to glomerular permeability, while molecular size and conformation seem to be more important. Yet, the weak electrical charge obtained in this study can be predicted to nearly totally exclude albumin from permeating through “high-selectivity” pathways in a charged-fiber matrix of the GFB.

scholarly journals A One-Dimensional Model Capturing Selective Ion Transport Effects in Nanofluidic Devices

2007 ◽  
Author(s):  
Brice T. Hughes ◽  
Jordan M. Berg ◽  
Darryl L. James ◽  
Akif Ibraguimov ◽  
Shaorong Liu ◽  
...  
Keyword(s):  
Ion Transport ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Model Performance ◽  
Convective Transport ◽  
Computationally Efficient ◽  
One Dimensional ◽  
Nanofluidic Devices ◽  
Critical Model

This paper presents a numerical model of one-dimensional, steady-state, multi-species, ion transport along a channel of variable width and depth. It is intended for computationally efficient simulation of devices with large variations in characteristic length scale—for example those incorporating both micro- and nanochannels. The model represents both volume charge in the fluid and surface charge on the channel walls as equivalent linear charge densities. The relative importance of the surface terms is captured by a so-called “overlap parameter” that accounts for electric double-layer effects, such as selective ion transport. Scale transitions are implemented using position-dependent area and perimeter functions. The model is validated against experimental results previously reported in the literature. In particular, model predictions are compared to measurements of fluorescent tracer species in nanochannels, of nanochannel conductivity, and of the relative enhancement and depletion of negatively and positively charged tracer species in a device combining micro- and nanochannels. Surface charge density is a critical model parameter, but in practice it is often poorly known. Therefore it is also shown how the model may be used to estimate surface charge density based on measurements. In two of the three experiments studied the externally applied voltage is low, and excellent results are achieved with electroosmotic terms neglected. In the remaining case a large external potential (∼ 1 kV) is applied, necessitating an additional adjustable parameter to capture convective transport. With this addition, model performance is excellent.

Charge Characteristics of Nanofiltration Membrane by Streaming Potential Method

2011 ◽  
Vol 396-398 ◽  
pp. 547-551 ◽  
Author(s):  
Bao Wei Su ◽  
Xiao Jie Duan ◽  
Mao Wei Dou ◽  
Xue Li Gao ◽  
Cong Jie Gao
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Electrostatic Interactions ◽  
Membrane Surface ◽  
Streaming Potential ◽  
Freundlich Isotherm ◽  
Potential Method ◽  
Nanofiltration Membrane ◽  
Membrane Surface Charge

Surface charge properties of DL nanofiltration membrane were studied using streaming potential method. The results indicate that in the experimental concentration range, the relationship between NF membrane surface charge density and electrolyte solution concentration is in good agreement with Freundlich-isotherm adsorption, which indicates that the membrane surface charge comes from the adsorption of ions of the solution. In addition, the analysis of anion and cation adsorption on nanofiltration membrane surface showed that adsorption of common ions to the Inner Helmholtz Plane through specific adsorption increases the charge density, while adsorption of counter ions to the Outer Helmholtz Plane through electrostatic interactions leads to electric double-layer contracting inward, decreasing the membrane surface charge density.

scholarly journals Mapping Surface Charge Distribution of Single-Cell via Charged Nanoparticle

Cells ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1519
Author(s):  
Leixin Ouyang ◽  
Rubia Shaik ◽  
Ruiting Xu ◽  
Ge Zhang ◽  
Jiang Zhe
Keyword(s):  
Cell Surface ◽  
Charge Density ◽  
Surface Charge ◽  
Charge Distribution ◽  
Surface Charge Density ◽  
Single Cells ◽  
Fluorescent Light ◽  
Fluorescent Nanoparticles ◽  
Cell Surface Charge ◽  
Surface Charge Distribution

Many bio-functions of cells can be regulated by their surface charge characteristics. Mapping surface charge density in a single cell’s surface is vital to advance the understanding of cell behaviors. This article demonstrates a method of cell surface charge mapping via electrostatic cell–nanoparticle (NP) interactions. Fluorescent nanoparticles (NPs) were used as the marker to investigate single cells’ surface charge distribution. The nanoparticles with opposite charges were electrostatically bonded to the cell surface; a stack of fluorescence distribution on a cell’s surface at a series of vertical distances was imaged and analyzed. By establishing a relationship between fluorescent light intensity and number of nanoparticles, cells’ surface charge distribution was quantified from the fluorescence distribution. Two types of cells, human umbilical vein endothelial cells (HUVECs) and HeLa cells, were tested. From the measured surface charge density of a group of single cells, the average zeta potentials of the two types of cells were obtained, which are in good agreement with the standard electrophoretic light scattering measurement. This method can be used for rapid surface charge mapping of single particles or cells, and can advance cell-surface-charge characterization applications in many biomedical fields.

Triboelectrification of nanocomposites using identical polymer matrixes with different concentrations of nanoparticle fillers

2021 ◽  
Author(s):  
Linards Lapčinskis ◽  
Artis Linarts ◽  
Kaspars Mālnieks ◽  
Hyunseung Kim ◽  
Kristaps Rubenis ◽  
...  
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Polymer Layers

In this study, we investigate triboelectrification in polymer-based nanocomposites using identical polymer matrixes containing different concentrations of nanoparticles (NPs). The triboelectric surface charge density on polymer layers increased as the...

scholarly journals Effect of Selected Anionic and Cationic Drugs Affecting the Central Nervous System on Electrical Properties of Phosphatidylcholine Liposomes: Experiment and Theory

2021 ◽  
Vol 22 (5) ◽  
pp. 2270
Author(s):  
Joanna Kotyńska ◽  
Monika Naumowicz
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Barbituric Acid ◽  
Membrane Surface ◽  
Adsorption Equilibria ◽  
Two Component ◽  
The Central Nervous System

Interactions between phospholipid membranes and selected drugs affecting the central nervous system (CNS) were investigated. Small, unilamellar liposomes were used as biomimetic cell membrane models. Microelectrophoretic experiments on two-component liposomes were performed using the electrophoretic light scattering technique (ELS). The effect of both positively (perphenazine, PF) and negatively (barbituric acid, BA) charged drugs on zwitterionic L-α-phosphatidylcholine (PC) membranes were analyzed. Experimental membrane surface charge density (d) data were determined as a function of pH. Quantitative descriptions of the adsorption equilibria formed due to the binding of solution ions to analyzed two-component membranes are presented. Binding constants of the solution ions with perphenazine and barbituric acid-modified membranes were determined. The results of our research show that both charged drugs change surface charge density values of phosphatidylcholine membranes. It can be concluded that perphenazine and barbituric acid are located near the membrane surface, interacting electrostatically with phosphatidylcholine polar heads.

Surface charging parameters of charged particles in symmetrical electrolyte solutions

2020 ◽  
Vol 22 (35) ◽  
pp. 20123-20142
Author(s):  
Hadi Saboorian-Jooybari ◽  
Zhangxin Chen
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Electrolyte Solution ◽  
Surface Charge Density ◽  
Potential Surface ◽  
Research Work ◽  
Charged Particles ◽  
Electrolyte Solutions ◽  
Surface Charging ◽  
Curvature Dependence

This research work is directed at development of accurate physics-based formulas for quantification of curvature-dependence of surface potential, surface charge density, and total surface charge for cylindrical and spherical charged particles immersed in a symmetrical electrolyte solution.

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