Coagulation and charging of latex particles in the presence of imogolite

Kobayashi, Motoyoshi; Nitanai, Miki; Satta, Naoya; Adachi, Yasuhisa

doi:10.1016/j.colsurfa.2012.12.057

Cited by 29 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our stability ratio shows typical behaviors expected from the DLVO theory [8]. That is, we confirm that our hematite particles behave normally, while some colloids behave anomaly [25,32]. From Fig.…”

Section: Stability Ratio With Dlvo Theorysupporting

confidence: 86%

Effect of anionic surfactants on the stability ratio and electrophoretic mobility of colloidal hematite particles

Kobayashi

Yuki

Adachi

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

Self Cite

View full text Add to dashboard Cite

Section: Stability Ratio With Dlvo Theorysupporting

confidence: 86%

Effect of anionic surfactants on the stability ratio and electrophoretic mobility of colloidal hematite particles

Kobayashi

Yuki

Adachi

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

Self Cite

View full text Add to dashboard Cite

“…Aggregation occurs at a charge neutralization condition induced by the interaction between oppositely charged interface and ionic substances such as polyelectrolytes [1][2][3], clays [4], multivalent ions [5,6], and surfactants [7,8]. While the attachment of strongly attracted and oppositely charged substances effectively realizes the charge neutralization, the overdose of such substances often results in the charge reversal and re-dispersion of colloidal particles.…”

Section: Introductionmentioning

confidence: 99%

Charge reversal of sulfate latex induced by hydrophobic counterion: effects of surface charge density

2016

Self Cite

View full text Add to dashboard Cite

We studied experimentally and theoretically the charge reversal of sulfate latex colloid in the presence of monovalent hydrophobic counter-ion TPP + (tetraphenylphosponium). The intrinsic or chemical energy of adsorption of TPP + on the latex was evaluated from the concentration at charge reversal. The iso-electric point (IEP) increases with increasing the surface or electrokinetic charge density of sulfate latex spheres. That is, at low surface or electrokinetic charge density, the charge inversion concentration is low, and IEP shifts to higher values with the increase of surface or electrokinetic charge density. The intrinsic energy of adsorption decreases with increasing the surface or electrokinetic charge density. Finally our experimental and theoretical results suggest that the hydrophobicity is a determining factor for the charge inversion of hydrophobic colloids, and the intrinsic energy of adsorption also varies with the variations of surface or electrokinetic charge density.

show abstract

“…To determine the optimum conditions for a flocculation process, it is important to consider the removal characteristics in terms of the flocculation-sedimentation and charge characteristics of the particles in the mixed system. Accordingly, Kobayashi et al [12] described coagulation and dispersion mechanisms, charge neutralization, and sweep coagulation in terms of the charging and coagulation properties of natural imogolite clay by conducting coagulation-sedimentation experiments in latex-imogolite mixed systems under various pH values. However, it is difficult to apply this method for cement suspensions obtained from construction sites, because the wastewaters generated at construction sites differ considerably depending on the type, method, and natural conditions.…”

Section: Introductionmentioning

confidence: 99%

Application of Poly-γ-Glutamic Acid Flocculant to Flocculation–Sedimentation Treatment of Ultrafine Cement Suspension

Yanagibashi

Kobayashi

Omori

2019

Water

Self Cite

View full text Add to dashboard Cite

We examined the effect of poly-γ-glutamic acid flocculant (PGAF) on the removal of ultrafine cement (UFC) particles stabilized by a poly-carboxylate co-polymer, which is a superplasticizer (SP). The flocculation–sedimentation treatment with PGAF successfully removed the SP-stabilized cement particles through the gravitational settling of the formed flocs. The removal efficiency reduced with the increase in the ionic strength, probably because of the shrunk form of poly-γ-glutamic acid (γ-PGA) at high ionic strengths. Increasing the mixing intensity during rapid mixing improved the removal efficiency. A series of flocculation–sedimentation experiments provided a diagram showing the relationship between ionic strengths and the addition amount of PGAF. Our results suggest that PGAF is a good candidate for the purification of cement suspension by flocculation–sedimentation, and a better removal performance can be obtained at lower ionic strengths with intense rapid mixing. From the diagram of the control charts presented in this study, we can determine the optimal addition amount of PGAF for achieving the target removal rate for cement suspension under any ionic strength.

show abstract

Coagulation and charging of latex particles in the presence of imogolite

Cited by 29 publications

References 23 publications

Effect of anionic surfactants on the stability ratio and electrophoretic mobility of colloidal hematite particles

Effect of anionic surfactants on the stability ratio and electrophoretic mobility of colloidal hematite particles

Charge reversal of sulfate latex induced by hydrophobic counterion: effects of surface charge density

Application of Poly-γ-Glutamic Acid Flocculant to Flocculation–Sedimentation Treatment of Ultrafine Cement Suspension

Contact Info

Product

Resources

About