scholarly journals ζ-POTENTIAL AND SURFACE CHARGE DENSITY OF TANNIC ACID-TREATED NYLON 6 FIBERS IN ACID DYE SOLUTIONS

1981 ◽  
Vol 37 (6) ◽  
pp. T241-T246 ◽  
Author(s):  
Shinji Ogasawara ◽  
Hiromasa Asami ◽  
Yoshifumi Kimura ◽  
Shigetaka Kuroiwa
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Tannic Acid ◽  
Surface Charge Density ◽  
Nylon 6 ◽  
Acid Dye ◽  
Ζ Potential ◽  
Dye Solutions

The ζ-Potential of Kaolinite Particles

1956 ◽  
Vol 9 (4) ◽  
pp. 450 ◽  
Author(s):  
N Street ◽  
AS Buchanan
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Electrophoretic Mobility ◽  
Surface Charge Density ◽  
Considerable Increase ◽  
Ionic Species ◽  
Ζ Potential ◽  
Potentiometric Titrations ◽  
Kaolinite Suspension

Electrophoretic mobility measurements, and both conductometric and potentiometric titrations, were carried out on a kaolinite suspension throughout its neutralization by various bases. The concentration of the ionic species present was calculated from the conductometric and potentiometric titrations, and the true ζ-potential calculated from the electrophoretic mobility by Stigter and Mysels's (1955) method. The results indicate that a discontinuity exists in the adsorption of ions in the vicinity of pH 6.5-7.0 causing a considerable increase in the surface charge density of the particles.

scholarly journals Density of surface charge is a more predictive factor of the toxicity of cationic carbon nanoparticles than zeta potential

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Maud Weiss ◽  
Jiahui Fan ◽  
Mickaël Claudel ◽  
Thomas Sonntag ◽  
Pascal Didier ◽  
...  
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Airway Inflammation ◽  
Surface Charge Density ◽  
Airway Epithelial Cells ◽  
Mucus Production ◽  
Ζ Potential ◽  
Viability Loss

Abstract Background A positive surface charge has been largely associated with nanoparticle (NP) toxicity. However, by screening a carbon NP library in macrophages, we found that a cationic charge does not systematically translate into toxicity. To get deeper insight into this, we carried out a comprehensive study on 5 cationic carbon NPs (NP2 to NP6) exhibiting a similar zeta (ζ) potential value (from + 20.6 to + 26.9 mV) but displaying an increasing surface charge density (electrokinetic charge, Qek from 0.23 to 4.39 µmol/g). An anionic and non-cytotoxic NP (NP1, ζ-potential = − 38.5 mV) was used as control. Results The 5 cationic NPs induced high (NP6 and NP5, Qek of 2.95 and 4.39 µmol/g, respectively), little (NP3 and NP4, Qek of 0.78 and 1.35 µmol/g, respectively) or no (NP2, Qek of 0.23 µmol/g) viability loss in THP-1-derived macrophages exposed for 24 h to escalating NP dose (3 to 200 µg/mL). A similar toxicity trend was observed in airway epithelial cells (A549 and Calu-3), with less viability loss than in THP-1 cells. NP3, NP5 and NP6 were taken up by THP-1 cells at 4 h, whereas NP1, NP2 and NP4 were not. Among the 6 NPs, only NP5 and NP6 with the highest surface charge density induced significant oxidative stress, IL-8 release, mitochondrial dysfunction and loss in lysosomal integrity in THP-1 cells. As well, in mice, NP5 and NP6 only induced airway inflammation. NP5 also increased allergen-induced immune response, airway inflammation and mucus production. Conclusions Thus, this study clearly reveals that the surface charge density of a cationic carbon NP rather than the absolute value of its ζ-potential is a relevant descriptor of its in vitro and in vivo toxicity.

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