Dielectric Constant of Liquids Confined in the Extended Nanospace Measured by a Streaming Potential Method

2015 ◽  
Vol 87 (3) ◽  
pp. 1475-1479 ◽  
Author(s):  
Kyojiro Morikawa ◽  
Yutaka Kazoe ◽  
Kazuma Mawatari ◽  
Takehiko Tsukahara ◽  
Takehiko Kitamori
Keyword(s):  
Dielectric Constant ◽  
Streaming Potential ◽  
Potential Method ◽  
Extended Nanospace

The Determination of Electrokinetic Coupling-Coefficient and Zeta Potential of Rock Samples by Electrokinetic Measurements

2012 ◽  
Vol 516-517 ◽  
pp. 1870-1873 ◽  
Author(s):  
Jun Wang ◽  
Heng Shan Hu
Keyword(s):  
Zeta Potential ◽  
Coupling Coefficient ◽  
Streaming Potential ◽  
Potential Method ◽  
Surface Conductivity ◽  
Reliable Estimate ◽  
Surface Conductance ◽  
Streaming Current ◽  
Low Concentrations

The electrokinetic effects are important in the understanding of electric properties in porous medium. In this study, the streaming potential and streaming current of saturated samples are measured at different concentrations, then three methods are applied to obtain the zeta-potential and electrokinetic coupling coefficient. The study shows that the results obtained from streaming potential and streaming current methods agree well with each other, but the results obtained from simplified streaming potential method become seriously inaccurate at low concentrations due to the influence of surface conductance. This experimental study also provides a reliable estimate of the surface conductivity and its contribution to zeta-potential at given concentrations.

Streaming potential/current measurement system for investigation of liquids confined in extended-nanospace

Lab on a Chip ◽  
2010 ◽  
Vol 10 (7) ◽  
pp. 871 ◽  
Author(s):  
Kyojiro Morikawa ◽  
Kazuma Mawatari ◽  
Masaru Kato ◽  
Takehiko Tsukahara ◽  
Takehiko Kitamori
Keyword(s):  
Measurement System ◽  
Streaming Potential ◽  
Current Measurement ◽  
Extended Nanospace

Characterization of Polyelectrolyte Multilayers by the Streaming Potential Method

Langmuir ◽  
2004 ◽  
Vol 20 (24) ◽  
pp. 10517-10525 ◽  
Author(s):  
Z. Adamczyk ◽  
M. Zembala ◽  
P. Warszyński ◽  
B. Jachimska
Keyword(s):  
Streaming Potential ◽  
Potential Method ◽  
Polyelectrolyte Multilayers

Electrokinetic Phenomena of Sulfonated-Polyethersulfone Ultrafiltration Membrane Modified by TiO2 Nanoparticles

2010 ◽  
Vol 152-153 ◽  
pp. 639-642
Author(s):  
Ming Liang Luo ◽  
Jia Lin Liu ◽  
Hong Jian Liu ◽  
Zi Long Jia
Keyword(s):  
Composite Membrane ◽  
Self Assembly ◽  
Streaming Potential ◽  
Potential Method ◽  
Inversion Method ◽  
Nano Tio2 ◽  
Electrokinetic Phenomena ◽  
Uf Membranes ◽  
Phase Inversion Method ◽  
Sulfonated Polyethersulfone

The sulfonated-polyethersulfone (SPES)/nano-TiO2 composite ultrafiltration (UF) membranes were prepared by phase inversion method with nano-TiO2 as additive. The TiO2 self-assembly on the SPES membrane was confirmed by FT-IR and the isoelectric point’s analysis (IEPs). The electrokinetic phenomena of composite membrane in the different single electrolyte solution were investigated by the streaming potential method. The results showed that the IEP of the SPES-UF membrane modified by nano-TiO2 shifts from 3.5 to 2.9, and the composite membrane shows a stronger electronegativity, which indicates the antifouling performance improvement of the SPES-UF membrane modified by nano-TiO2. The valences of the cations and anions have an important influence on the streaming potential of the composite UF membrane.

The Effects of Residual Lignin Content on Wood Fibre Reinforced Polypropylene Composites

2007 ◽  
Vol 29-30 ◽  
pp. 323-326
Author(s):  
M.D.H. Beg ◽  
K.L. Pickering
Keyword(s):  
Lignin Content ◽  
Streaming Potential ◽  
Potential Method ◽  
Kraft Pulping ◽  
Impact Testing ◽  
Wood Fibre ◽  
Accelerated Weathering ◽  
Residual Lignin ◽  
Polypropylene Composites ◽  
Twin Screw

This study investigates the effect weathering on composites made from fibre subjected to various stages of a standard Kraft pulping process. Pre-washed, washed and bleached Kraft wood fibre of kappa numbers 27, 17, and 1 was assessed in terms of its surface potential using the streaming potential method and combined with polypropylene (PP) to produce composites. Composites were prepared using a twin screw extruder followed by pelletising and injection moulding. Tensile testing, hardness testing and impact testing were carried out to evaluate the composite mechanical properties. It was found that fibre with higher amounts of residual lignin content led to composites with lower tensile and impact strengths and increased degradability when subjected to accelerated weathering testing.

scholarly journals The electrokinetic potential of barium sulphate

1948 ◽  
Vol 195 (1041) ◽  
pp. 150-162 ◽  
Keyword(s):  
Elevated Temperatures ◽  
Electrokinetic Potential ◽  
Selective Adsorption ◽  
Streaming Potential ◽  
Inorganic Ions ◽  
Potential Method ◽  
Barium Sulphate ◽  
Saturated Solution ◽  
Prolonged Treatment ◽  
The Difference

The electrokinetic potential of barium sulphate, recrystallized from hot concentrated sulphuric acid and subsequently ignited, was investigated against its saturated solution in water by the streaming potential method. The potential is positive and reproducible. The potential of natural barite is also positive but smaller than that of the recrystallized barium sulphate. The difference is not due to impurity in the natural barium sulphate, but it is more likely to be due to irregularity of the surface and consequent distortion of the lattice of the recrystallized barium sulphate. The greater the distortion, the higher is the ζ-potential. The influence of most electrolytes on the potential is completely reversible if there has been contact only at room temperature. Irreversible electrolyte effects are found after prolonged treatment at elevated temperatures. Barium salts and sulphates have a stronger influence on the potential than most other inorganic ions, including multivalent ions such as lanthanum. The potential is a logarithmic function of the activity of the electrolyte solution, but the slope of the curves is smaller than that expected for a thermodynamically reversible electrode. The magnitude of the influence of electrolytes on the potential of recrystallized barium sulphate and of natural barite is very much the same, in spite of the fact that the absolute values of potential of the two types are very different, which is contrary to expectation on the basis of a purely electrostatic theory of ion adsorption. The potential of barium sulphate in its saturated solution cannot be wholly explained by selective adsorption of ions from the solution, but the relative tendencies of the ions to be released from the crystal lattice must be taken into consideration.

Computer Simulation of the Metal Silicide

2012 ◽  
Vol 170-173 ◽  
pp. 3367-3370
Author(s):  
Dong Chen ◽  
Chao Xu
Keyword(s):  
Dielectric Constant ◽  
First Principles ◽  
Plasma Frequency ◽  
Low Frequency ◽  
Potential Method ◽  
Frequency Region ◽  
Optical Parameters ◽  
Metal Silicide ◽  
Near Future ◽  
Pseudo Potential

We have investigated the optical properties of the Fm-3m-Mg2Si using the first-principles plane-wave pseudo-potential method. Some important optical parameters (reflectivity, refractive index, extinction coefficient, loss function and dielectric function) are calculated and investigated at high pressure. The calculated static dielectric constant ε(0) is 15.9. The computed plasma frequency is 12eV. Some interesting features in the optical parameters are found in the low frequency region. Nevertheless, the calculated result needs to be testified by experiments in the near future.

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