Experiment Probe on Micro-Electric Field Effects on Seepage in Micro Particle Clays

Using laboratory experiment method, the micro-electric field effect on seepage in micro particle clays is discussed in this paper. A series of micro-and mesoscopic parameters and seepage consolidation tests are conducted for the samples of micro particle clays with different ion concentrations in pore water or particle surface electric potentials. The test results show that an increase in particle surface electric potential or a decrease in ion concentration will result in the decrease of equivalent permeability coefficient, consolidation rate and consolidation displacement, revealing the existence of micro-electric field effect on seepage in micro particle clays.

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Evidence for the existence of an electric field effect from the vinyl proton magnetic resonance spectra of 4-substituted styrenes

Canadian Journal of Chemistry ◽

10.1139/v68-632 ◽

1968 ◽

Vol 46 (24) ◽

pp. 3813-3820 ◽

Cited By ~ 20

Author(s):

G. K. Hamer ◽

W. F. Reynolds

Keyword(s):

Chemical Shift ◽

Electric Field ◽

Field Effect ◽

Chemical Shifts ◽

Electric Field Effect ◽

Vinyl Proton ◽

Concentration Effects ◽

Electric Field Effects ◽

Field Effects ◽

Proton Chemical Shifts

Vinyl proton chemical shifts of styrene and six 4-substituted styrenes have been determined at infinite dilution in cyclohexane. It is shown that changes in the chemical shift difference of the β protons, Δ(δC − δB) can be accounted for by electric field effects. Reasonable values of the constant in the Buckingham equation of(−3.11 ± 0.50) × 10−12 and (−4.77 ± 0.83) × 10−12 are obtained from two different types of field effect calculations. Residual chemical shift changes for β protons after correction for electric field effects can be explained in terms of mesomeric and possibly inductive mechanisms. α-Proton chemical shift values cannot be satisfactorily rationalized. Small concentration effects are noted, usually resulting in high field shifts with increasing concentration. Previous results are reexamined in order to resolve a conflict in the literature.

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Cosmic-ray atmospheric electric field effects

Canadian Journal of Physics ◽

10.1139/p95-063 ◽

1995 ◽

Vol 73 (7-8) ◽

pp. 440-443 ◽

Cited By ~ 5

Author(s):

L. I. Dorman ◽

I. V. Dorman

Keyword(s):

Electric Field ◽

Field Effect ◽

Cosmic Ray ◽

Atmospheric Electric Field ◽

Electric Field Effect ◽

Neutron Monitors ◽

Muon Component ◽

Electric Field Effects ◽

Field Effects ◽

Neutron Component

Experimental data on the atmospheric electric field effect in the cosmic-ray muon component are discussed on the basis of the general theory of cosmic-ray meteorological effects. In this framework, we develop the theory of atmospheric electric field effects in the hard- and soft-muons of secondary cosmic rays and in the neutron-monitor counting rates as well. We show that the experimental results can be understood on the basis of this theory. We also show that a sufficient atmospheric electric field effect in the cosmic-ray neutron component is to be expected because the neutron monitors work as analyzers of soft muons and really detect only negative muons as well as neutrons.

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Theoretical Model Study of Micro-Electric Field Effects on Seepage in Micro Particle Clays

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.2946 ◽

2011 ◽

Vol 239-242 ◽

pp. 2946-2952

Author(s):

Ying Guang Fang ◽

Ren Guo Gu ◽

Wei Dong Pan

Keyword(s):

Theoretical Model ◽

Electric Field ◽

Pore Water ◽

Electric Potential ◽

Particle Surface ◽

Quantitative Description ◽

Movement Pattern ◽

Ion Concentration ◽

Electric Field Effect ◽

Micro Particles

Electric charges exist on the clay particle surfaces and induce a micro-electric field which leads to the formation of adsorbed water surrounding clay particles and exerts an influence on the movement pattern of ions in pore water, resulting in the ion effect of seepage in clay. The two factors above will obviously change the characteristics of seepage in micropore of clays. The change of seepage property caused by the factors mentioned above is defined as micro-electric field effect on seepage (MEFES) in clay. The electric potential on the surface of micro particles of clay amounts to tens or hundreds of mV, and then the electric field on the particle surface greatly affects the regulation of seepage. Using theoretical analyses, MEFES in micro particle clays is discussed in this paper. A theoretical model of seepage is proposed for the quantitative description of MEFES. The theoretical model shows the influences of particle surface electric potential, pore sizes, soil conductance, ion concentration in pore water, ion valence , viscosity etc. on seepage characteristics. The equivalent permeability coefficient derived from the theoretical model can be also simplified to that of Darcy’s law without regard to MEFES.

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