Effects of the internal structure of spheroidal divalent ions on the charge density profiles of the electric double layer

2012 ◽  
Vol 137 (22) ◽  
pp. 224701 ◽  
Author(s):  
José Guadalupe Ibarra-Armenta ◽  
Alberto Martín-Molina ◽  
Klemen Bohinc ◽  
Manuel Quesada-Pérez
Keyword(s):  
Charge Density ◽  
Internal Structure ◽  
Double Layer ◽  
Electric Double Layer ◽  
Divalent Ions ◽  
Density Profiles

Ferroelectric field control of charge density in oxide films with polarization reversal by electric double layer

2018 ◽  
Vol 113 (14) ◽  
pp. 143501 ◽  
Author(s):  
Ryutaro Nishino ◽  
Yusuke Kozuka ◽  
Fumitaka Kagawa ◽  
Masaki Uchida ◽  
Masashi Kawasaki
Keyword(s):  
Charge Density ◽  
Double Layer ◽  
Electric Double Layer ◽  
Oxide Films ◽  
Polarization Reversal ◽  
Field Control

scholarly journals Electric Double Layer and Orientational Ordering of Water Dipoles in Narrow Channels within a Modified Langevin Poisson-Boltzmann Model

Entropy ◽  
2020 ◽  
Vol 22 (9) ◽  
pp. 1054
Author(s):  
Mitja Drab ◽  
Ekaterina Gongadze ◽  
Veronika Kralj-Iglič ◽  
Aleš Iglič
Keyword(s):  
Charge Density ◽  
Double Layer ◽  
Electric Double Layer ◽  
Energy Functional ◽  
Large Radius ◽  
Charged Surface ◽  
Volume Charge ◽  
Volume Charge Density ◽  
Poisson Boltzmann ◽  
Orientational Ordering

The electric double layer (EDL) is an important phenomenon that arises in systems where a charged surface comes into contact with an electrolyte solution. In this work we describe the generalization of classic Poisson-Boltzmann (PB) theory for point-like ions by taking into account orientational ordering of water molecules. The modified Langevin Poisson-Boltzmann (LPB) model of EDL is derived by minimizing the corresponding Helmholtz free energy functional, which includes also orientational entropy contribution of water dipoles. The formation of EDL is important in many artificial and biological systems bound by a cylindrical geometry. We therefore numerically solve the modified LPB equation in cylindrical coordinates, determining the spatial dependencies of electric potential, relative permittivity and average orientations of water dipoles within charged tubes of different radii. Results show that for tubes of a large radius, macroscopic (net) volume charge density of coions and counterions is zero at the geometrical axis. This is attributed to effective electrolyte charge screening in the vicinity of the inner charged surface of the tube. For tubes of small radii, the screening region extends into the whole inner space of the tube, leading to non-zero net volume charge density and non-zero orientational ordering of water dipoles near the axis.

Charge Density Dependent Two-Channel Conduction in Organic Electric Double Layer Transistors (EDLTs)

2014 ◽  
Vol 26 (16) ◽  
pp. 2527-2532 ◽  
Author(s):  
Wei Xie ◽  
Feilong Liu ◽  
Sha Shi ◽  
P. Paul Ruden ◽  
C. Daniel Frisbie
Keyword(s):  
Charge Density ◽  
Double Layer ◽  
Electric Double Layer ◽  
Density Dependent
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