Zeta potential study of natural- and acid-activated sepiolites in electrolyte solutions

2011 ◽  
Vol 90 (3) ◽  
pp. 785-792 ◽  
Author(s):  
Sedef Dikmen ◽  
Gulgun Yilmaz ◽  
Ertugrul Yorukogullari ◽  
Emine Korkmaz
Keyword(s):  
Zeta Potential ◽  
Electrolyte Solutions ◽  
Potential Study

Zeta potential study of thermally treated dolomite samples in electrolyte solutions

2009 ◽  
Vol 122 (1-3) ◽  
pp. 99-104 ◽  
Author(s):  
Reda Marouf ◽  
Kheira Marouf-Khelifa ◽  
Jacques Schott ◽  
Amine Khelifa
Keyword(s):  
Zeta Potential ◽  
Electrolyte Solutions ◽  
Potential Study ◽  
Thermally Treated

The effects of electrolyte concentration, ion species and pH on the zeta potential and electrokinetic charge density of montmorillonite

Clay Minerals ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 853-861 ◽  
Author(s):  
E. E. Saka ◽  
C. Güler
Keyword(s):  
Zeta Potential ◽  
Charge Density ◽  
Negative Charge ◽  
Electrolyte Concentration ◽  
Great Influence ◽  
Electrolyte Solutions ◽  
Ionic Species ◽  
Positive Sign ◽  
Ion Species ◽  
Influence Of Ph

AbstractIn this study, the influence of pH, electrolyte concentration and type of ionic species (such as LiCl, NaCl, KCl, RbCl, CsCl, CaCl2, AlCl3) on the electrokinetic properties (zeta potential and electrokinetic charge density) of montmorillonite has been quantified. The zeta potential of montmorillonite particles did not change significantly with change in pH. The valencies of the ions have proven to have a great influence on the electrokinetic behaviour of the suspension. There is a gradual decrease in the zeta potential (from —24 mV to —12 mV) with increase in monovalent electrolyte concentration (from 10-4 M to 10-1 M). At any monovalent electrolyte concentration, the magnitude of the zeta potential increased with the electrolytes in the order Li+ > Na+ > K+ > Rb+ > Cs+. The zeta potential of the montmorillonite minerals in CaCl2 solutions illustrated the same behaviour as the monovalent cations. Less negative values were obtained for the CaCl2 electrolyte (∼–10 mV) due to the greater valence of the ions. A sign reversal was observed at an AlCl3 concentration of 5 x 10-4 M, and, at greater concentrations, zeta potential values had a positive sign (∼20 mV).The electrokinetic charge density of montmorillonite showed similar trends of variation in mono and divalent electrolyte solutions. Up to concentrations of ∼10-3 M, it remained practically constant at ∼0.5 x 10-3Cm-2, while for greater electrolyte concentrations the negative charge produced more negative values (–16 x 10-3Cm-2). The electrokinetic charge density of montmorillonite particles was constant at low AlCl3 concentrations, but at certain concentrations it increased rapidly and changed sign to positive.

Effect of clay colloids on the zeta potential of Fe/Al oxide-coated quartz: a streaming potential study

2016 ◽  
Vol 16 (12) ◽  
pp. 2676-2686 ◽  
Author(s):  
Zhong-yi Li ◽  
Ren-kou Xu ◽  
Jiu-yu Li ◽  
Zhi-neng Hong
Keyword(s):  
Zeta Potential ◽  
Streaming Potential ◽  
Potential Study ◽  
Al Oxide

Zeta potential of particle bilayers on mica: A streaming potential study

2011 ◽  
Vol 360 (1) ◽  
pp. 195-203 ◽  
Author(s):  
Maria Zaucha ◽  
Zbigniew Adamczyk ◽  
Jakub Barbasz
Keyword(s):  
Zeta Potential ◽  
Streaming Potential ◽  
Potential Study

Electrokinetics-generated pore fluid and ionic transport in an offshore calcareous soil

2003 ◽  
Vol 40 (6) ◽  
pp. 1185-1199 ◽  
Author(s):  
E Mohamedelhassan ◽  
J Q Shang
Keyword(s):  
Zeta Potential ◽  
Calcareous Soil ◽  
Fluid Transport ◽  
Calcareous Soils ◽  
Maximum Flow ◽  
Ionic Transport ◽  
Electrolyte Solutions ◽  
Pore Fluid ◽  
Zeta Potentials ◽  
Soil Pores

In this study, the electrokinetics-generated pore fluid transport in an offshore calcareous soil is investigated in three steps. The pore fluid of the soil specimen tested has a salinity equivalent to that of seawater (artificial or A-seawater). The electroosmotic flow rates are measured for the A-seawater and two stabilizing permeating solutions, i.e., 15% CaCl2 and 10% Al2(SO4)3·18H2O solutions. The results show that electroosmosis generated significant flow in the soil and can effectively transport the two permeating solutions through soil pores filled with A-seawater. The maximum flow rate is observed in the test conducted with 15% CaCl2 solution, followed by those of A-seawater and 10% Al2(SO4)3·18H2O solutions, respectively. The results also show the significant role of electromigration in transporting the cations in the permeating solutions from the anode to the cathode. In particular, it is found that the electrokinetics-generated ionic transport for calcium (Ca2+) is 6.3 times faster than that for aluminum (Al3+). The surface charge properties of the calcareous soil are studied by measuring the zeta potentials of the soil solids suspended in electrolyte solutions of various types, concentrations, and pH values. The relationship between the experimental and theoretical coefficients of electroosmotic permeability, ke, is examined based on the results from the electrokinetic experiments and the Helmholtz–Smoluchowski model. It is concluded that the effectiveness of electroosmosis in transporting water can be predicted qualitatively or semiquantitatively from the zeta potential of the soil solids suspension. The influence of pore fluid pH on the zeta potential of the soil is also investigated. The study provides important information for the use of electrokinetics to facilitate in situ artificial cementation of calcareous soils for offshore foundation applications.Key words: calcareous soil, electrokinetics, electroosmosis, electromigration, zeta potential, soil–water–electrolyte system.

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