scholarly journals Rectification of bipolar nanopores in multivalent electrolytes: effect of charge inversion and strong ionic correlations

2020 ◽  
Vol 22 (34) ◽  
pp. 19033-19045 ◽  
Author(s):  
Dávid Fertig ◽  
Mónika Valiskó ◽  
Dezsö Boda
Keyword(s):  
Surface Charge ◽  
Charge Inversion ◽  
Multivalent Ions ◽  
Multivalent Electrolytes

The conductance properties of bipolar nanopores change non-monotonically with surface charge in the presence of multivalent ions due to charge inversion.

Charge inversion by multivalent ions: Dependence on dielectric constant and surface-charge density

2005 ◽  
Vol 72 (6) ◽  
Author(s):  
K. Besteman ◽  
M. A. G. Zevenbergen ◽  
S. G. Lemay
Keyword(s):  
Dielectric Constant ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Charge Inversion ◽  
Multivalent Ions

Surface charge inversion of self-assembled monolayers by visible light irradiation: cargo loading and release by photoreactions

2013 ◽  
Vol 49 (33) ◽  
pp. 3431 ◽  
Author(s):  
You Yu ◽  
Xiaomin Kang ◽  
Xinshi Yang ◽  
Lihua Yuan ◽  
Wen Feng ◽  
...  
Keyword(s):  
Visible Light ◽  
Surface Charge ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Self Assembled Monolayers ◽  
Charge Inversion ◽  
Assembled Monolayers ◽  
Self Assembled

Charge inversion of colloidal particles in an aqueous solution: Screening by multivalent ions

2001 ◽  
Vol 63 (4) ◽  
Author(s):  
Takamichi Terao ◽  
Tsuneyoshi Nakayama
Keyword(s):  
Aqueous Solution ◽  
Colloidal Particles ◽  
Charge Inversion ◽  
Multivalent Ions

Atomic force microscopy of mica surface after ion replacement

1991 ◽  
Vol 49 ◽  
pp. 628-629 ◽  
Author(s):  
B. L. Dixon Northern ◽  
Y. L. Chen ◽  
J.N. Israelachvili ◽  
J.A.N. Zasadzinski
Keyword(s):  
Surface Charge ◽  
Isomorphous Substitution ◽  
Potassium Ions ◽  
Force Microscopy ◽  
Atomic Force ◽  
Multivalent Ions ◽  
Monovalent Ions ◽  
Muscovite Mica ◽  
Negative Surface ◽  
Negative Surface Charge

Atomic Force Microscope (AFM), is the newest, and potentially most powerful of the scanning probe microscopes. The (AFM) is capable of resolutions approaching atomic dimensions on ideal surfaces. One of the favorite such surfaces is that of mica. Muscovite mica has a platelike structure consisting of an octahedral alumina sheet sandwiched by two tetrahedral silicate sheets. As a result of this structure, mica cleaves readily along a plane leaving a molecularly smooth surface. Because of the isomorphous substitution of the tetravalent silicon by trivalent aluminium, mica has an excess negative surface charge.This negative surface charge of 2.1-1014 charges per cm2 is neutralized by an equal number of positive monovalent ions, mainly potassium ions. The ion-exchangable surface ions of mica, in aqueous solution, can be readily replaced by other monovalent or multivalent ions. This ion exchange alters the surface of the mica. We then follow these changes by imaging with the AFM in air.

Molecular Dynamics Simulation of Electroosmotic Flow in Nanotubes

2007 ◽  
Author(s):  
Yunfei Chen ◽  
Zhonghua Ni ◽  
Guiming Wang ◽  
Dongyan Xu ◽  
Deyu Li
Keyword(s):  
Molecular Dynamics ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Electroosmotic Flow ◽  
Continuum Theory ◽  
Ion Distribution ◽  
Charge Inversion ◽  
Charge Densities ◽  
Simulation Results ◽  
The Continuum

The ion distribution and electroosmotic flow of sodium chloride solutions confined in cylindrical nanochannels with different surface charge densities are studied with molecular dynamics (MD). In order to obtain simulation results corresponding to more realistic situations, the MD simulation consists of two steps. The first step is used to equilibrate the system and obtain a more realistic ion distribution in the solution under different surface charge densities; and the second step is to apply an electrical field to drive the liquid and extract the electroosmotic flow information. Simulation results indicate that a higher surface-charge density corresponds to a higher peak of the counter ion concentration. Predictions based on the continuum theory were also calculated and compared with the molecular dynamics results. Even though the continuum theory cannot reflect the molecular nature of ions and water molecules, it is found that for low surface charge densities, the continuum theory can still give reasonable results if modified boundary conditions are applied. Charge inversion under high surface charge density has been predicted and observed recently, however, the simulation results do not indicate charge inversion even for a surface density as high as −0.34 C/m2. This might be due to the fact that we perform the MD simulations with monovalent ions, which have a tendency to suppress charge inversion, as demonstrated in the recent literature.

scholarly journals An ion-exchange nanomembrane sensor for detection of nucleic acids using a surface charge inversion phenomenon

2014 ◽  
Vol 60 ◽  
pp. 92-100 ◽  
Author(s):  
Satyajyoti Senapati ◽  
Zdenek Slouka ◽  
Sunny S. Shah ◽  
Susanta K. Behura ◽  
Zonggao Shi ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Nucleic Acids ◽  
Surface Charge ◽  
Charge Inversion ◽  
Inversion Phenomenon

Effects of pH, Ca- and SO4-concentration on surface charge and colloidal stability of goethite and hematite – consequences for the adsorption of anionic organic substances

Clay Minerals ◽  
2010 ◽  
Vol 45 (1) ◽  
pp. 1-13 ◽  
Author(s):  
J. Walsch ◽  
S. Dultz
Keyword(s):  
Surface Charge ◽  
Colloidal Stability ◽  
Streaming Potential ◽  
Cationic Polyelectrolyte ◽  
Solution Chemistry ◽  
Point Of Zero Charge ◽  
Stability Field ◽  
Fe Oxides ◽  
Multivalent Ions ◽  
Polyelectrolyte Titration

AbstractSoil solution chemistry, especially pH and the presence of multivalent ions, affects the surface charge (SC) of Fe oxides and accordingly colloidal stability and sorption properties. The SC of synthetic goethite and hematite was quantified in the presence of different electrolytes (NaCl, CaCl2, Na2SO4and CaSO4) by combining the streaming potential with polyelectrolyte titration. The point of zero charge (PZC) for goethite was observed at pH 8.2 and the stability field around the PZC, where colloids are flocculated, is more extended (±1 pH unit) than that of hematite with a PZC at pH 7.1 (±0.5 pH unit). The SC decreases with increasing SO4concentration, indicating adsorption of SO4on the oxide, whereas the presence of Ca increases the SC. At pH 4, the addition of 0.1 mmol l–1Na2SO4induced a decrease in SC from 1.5 to 0.380 μmolcm–2for goethite and from 0.85 to 0.42 μmolcm–2for hematite. In a suspension with 0.1 mmol l–1Na2SO4, the number of colloids is already reduced, and both oxides flocculate rapidly and completely at >0.5 mmol l–1Na2SO4. While the addition of SO4did not affect charge titrations with the cationic polyelectrolyte, the anionic polyelectrolyte formed complexes with Ca, resulting in an overestimation of positive SC. The electrolyte CaSO4is most efficient at keeping goethite and hematite in the pH range 4–10 in the flocculated state. Besides pH, the presence of multivalent ions should also be considered when predicting colloid mediated transport and adsorption properties of anionic substances by Fe oxides in soil systems.

scholarly journals Experimental Observation of Surface Charge Inversion in a Biological Nanopore in Presence of Monovalent and Multivalent Cations

2014 ◽  
Vol 106 (2) ◽  
pp. 210a
Author(s):  
María L. López-Peris ◽  
María Queralt-Martín ◽  
Vicente M. Aguilella ◽  
Antonio Alcaraz
Keyword(s):  
Surface Charge ◽  
Experimental Observation ◽  
Charge Inversion

scholarly journals LOW TEMPERATURE PHYSICS AT ROOM TEMPERATURE IN WATER: CHARGE INVERSION IN CHEMICAL AND BIOLOGICAL SYSTEMS

2002 ◽  
Vol 12 (02) ◽  
pp. 235-265 ◽  
Author(s):  
A. YU. GROSBERG ◽  
T. T. NGUYEN ◽  
B. I. SHKLOVSKII
Keyword(s):  
Room Temperature ◽  
Double Helix ◽  
Mean Field ◽  
Universal Theory ◽  
Dna Uptake ◽  
Charge Inversion ◽  
Multivalent Ions ◽  
Poisson Boltzmann ◽  
Chemical And Biological Systems ◽  
Dna Double Helix

We review recent advances in the physics of strongly interacting charged systems functioning in water at room temperature. We concentrate on the phenomena which go beyond the framework of mean field theories, whether linear Debye-Hückel or non-linear Poisson-Boltzmann. We place major emphasis on charge inversion - a counterintuitive phenomenon in which a strongly charged particle, called macroion, binds so many counterions that its net charge changes sign. We discuss the universal theory of charge inversion based on the idea of a strongly correlated liquid of adsorbed counterions, similar to a Wigner crystal. This theory has a vast array of applications, particularly in biology and chemistry; for example, the DNA double helix in the presence of positive multivalent ions (e.g., polycations) acquires a net positive charge and drifts as a positive particle in electric field. This simplifies DNA uptake by the cell as needed for gene therapy, because the cell membrane is negatively charged. We discuss also the analogies of charge inversion in other fields of physics.

Electrochemical surface charge-inversion from semi-insulating Sb2Se3 photoanodes and abrupt photocurrent generation for water splitting

2018 ◽  
Vol 11 (9) ◽  
pp. 2540-2549 ◽  
Author(s):  
Young Been Kim ◽  
Joo Sung Kim ◽  
Seung Ki Baek ◽  
Young Dae Yun ◽  
Sung Woon Cho ◽  
...  
Keyword(s):  
Surface Charge ◽  
Work Function ◽  
Water Splitting ◽  
Charge Inversion ◽  
Photocurrent Generation ◽  
Inversion Mechanism

Artificially synthesized n-type Sb2Se3 with a low work function produces abrupt photocurrent generation via a novel surface charge-inversion mechanism.

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