Interaction between Polyelectrolyte and Oppositely Charged Surfactant:  Effect of Charge Density

2004 ◽  
Vol 108 (26) ◽  
pp. 8976-8982 ◽  
Author(s):  
C. Wang ◽  
K. C. Tam
Keyword(s):  
Charge Density ◽  
Surfactant Effect ◽  
Oppositely Charged

Soluble complexes in aqueous mixtures of low charge density comb polyelectrolyte and oppositely charged surfactant probed by scattering and NMR

2007 ◽  
Vol 312 (1) ◽  
pp. 21-33 ◽  
Author(s):  
Luis A. Bastardo ◽  
Joseph Iruthayaraj ◽  
Maria Lundin ◽  
Andra Dedinaite ◽  
Aušvydas Vareikis ◽  
...  
Keyword(s):  
Charge Density ◽  
Aqueous Mixtures ◽  
Low Charge ◽  
Oppositely Charged ◽  
Soluble Complexes

Effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals as related to diffuse layer overlapping

Soil Research ◽  
2011 ◽  
Vol 49 (3) ◽  
pp. 231 ◽  
Author(s):  
Yan-ping Wang ◽  
Ren-kou Xu ◽  
Jiu-yu Li
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Surface Charge Density ◽  
Charged Particles ◽  
Double Layers ◽  
Mineral Particles ◽  
Variable Charge ◽  
Electrical Double Layers ◽  
Oppositely Charged ◽  
Positively Charged

Cadmium is a toxic metal with high reactivity in acid variable charge soils. Adsorption and desorption of Cd2+ in soil and mineral particles can be affected by the interaction between the electrical double layers on oppositely charged particles, because the interaction can decrease the surface-charge density of the particles. We studied the effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals and proposed the desorption mechanisms based on the overlapping of diffuse layers between negatively charged soils and mineral particles and positively charged Fe/Al oxide particles. Our results indicate that the overlapping of diffuse layers of electrical double layers between positively charged Fe/Al oxides [crystalline and amorphous Al(OH)3 and amorphous Fe(OH)3] and negatively charged Ultisol, Alfisol, kaolinite, and bentonite caused the effective negative surface-charge density on the soils and minerals to become less negative, and thus the adsorption affinity of these negatively charged surfaces for Cd2+ declined as a result of the incorporation of the Fe/Al oxides. Consequently, the release of exchangeable Cd2+ from the surfaces of the soils and minerals increased with the amount of Fe/Al oxides added. The more positive the charge on the surfaces of the Fe/Al oxides, the stronger the interaction of the electrical double layers between the oxides and soils and minerals, and thus the greater the release of Cd2+ from the soils and minerals. A decrease in pH led to an increase in the positive surface charge on the Fe/Al oxides and enhancement of the interaction of the electrical double layers between the oxides and soils and minerals. As a result, more Cd2+ was desorbed from the soils and minerals. This study suggests that the interaction between oppositely charged particles of variable charge soils can enhance the mobility of cadmium in the soils and thus increase its environmental risk.

scholarly journals Temporal Changes of Adsorbed Layer Thickness and Electrophoresis of Polystyrene Sulfate Latex Particles after Long Incubation of Oppositely Charged Polyelectrolytes with Different Charge Densities

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2394
Author(s):  
Thi Hai Yen Doan ◽  
Tien Duc Pham ◽  
Johan Hunziker ◽  
Thu Ha Hoang
Keyword(s):  
Charge Density ◽  
Layer Thickness ◽  
Electrophoretic Mobility ◽  
Incubation Time ◽  
Adsorbed Layer ◽  
Charge Densities ◽  
Molecular Weights ◽  
Desorption Equilibrium ◽  
Adsorption Desorption ◽  
Oppositely Charged

The different desorption concepts of the two polyelectrolytes PTMA5M and PTMC5M, which have similar molecular weights and differ in the charge density on the polystyrene sulfate latex (PSL) particles by 25 times, and with various charge densities in a long incubation, were systematically investigated based on hydrodynamic adsorbed layer thickness (δH) and electrophoretic mobility (EPM) under two ionic strengths in the present study. Herein, in the case of highly charged polyelectrolyte PTMA5M, desorption continued for 4 h and re-adsorbing proceeded after a longer incubation time higher than 4 h. Meanwhile, in the case of lowly charged polyelectrolyte PTMC5M, an adsorption–desorption equilibrium was suggested to take into account the unchanging of both δH and EPM.

scholarly journals The Effect of Molar Mass and Charge Density on the Formation of Complexes between Oppositely Charged Polyelectrolytes

Polymers ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 50 ◽  
Author(s):  
Feriel Lounis ◽  
Joseph Chamieh ◽  
Laurent Leclercq ◽  
Philippe Gonzalez ◽  
Hervé Cottet
Keyword(s):  
Charge Density ◽  
Molar Mass ◽  
Oppositely Charged ◽  
Formation Of Complexes
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