Electrophoretic mobility of carboxyl latex particles in the mixed solution of 1:1 and 2:1　electrolytes or 1:1 and 3:1 electrolytes: Experiments and modeling

Nishiya, Manami; Sugimoto, Takashige; Kobayashi, Motoyoshi

doi:10.1016/j.colsurfa.2016.05.045

Cited by 20 publications

(18 citation statements)

References 33 publications

(40 reference statements)

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“…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 or overcharging is induced by the overcompensation of counter-ions adjacent to the surface of oppositely charged particle. The overcompensation by counter-ions is considered to be driven by ion-ion correlation, specific binding, hydrophobic interaction, and so on [5][6][7]9]. The importance of the effect of hydrophobicity and hydrophilicity was clearly demonstrated by some studies, where the electrophoretic mobility of hydrophobic and hydrophilic particles were measured in the presence of big hydrophobic ions [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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

2016

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2016

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“…Ohshima et al [44] proposed an approximate expression of electrophoretic mobility in the case of symmetrical electrolytes successfully applied [42] and valid for κ a ≥ 10, that however comes with a more complex analytical expression. Also, in the case of mixed solutions (1:1 and 2:1 or 1:1 and 3:1 electrolytes), Nishiya et al [45] proposed a modeling strategy from the surface potential to the electrophoretic mobility based on Ohshima approximations. As the electrolytes used in this study are 1:1 and 1:2, this approach was not considered here.…”

Section: From Surface Potential ϕ 0 To Theoretical Electrophoretic Momentioning

confidence: 99%

“…As the ionic strength is increasing, these adsorbed ions will desorb further from the surface, in analogy with the desorption of ionic species in soils while increasing the ionic strength [46]. Several studies [42,45,47] compute the adsorbed charge density using a Stern layer model. However, this approach needs data (notably the ion bulk concentration) that is not given by the industrial latex provider.…”

Section: Modification Of the Charge Balance Solvedmentioning

confidence: 99%

Estimation of characteristic coagulation time based on Brownian coagulation theory and stability ratio modeling using electrokinetic measurements

Lachin

Sauze

Raimondi

et al. 2019

Chemical Engineering Journal

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“…The surface charging properties of colloidal particles are strongly affected by the adsorption of oppositely-charging species such as polyelectrolytes [5,6], surfactants [7,8], and multivalent ions [9][10][11] onto the surfaces. Such adsorption can induce so-called charge reversal/overcharging which causes the change in sign of the net surface charges due to the excess accumulation of counter ionic species [12].…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic mobility of carboxyl latex particles: effects of hydrophobic monovalent counter-ions

2017

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To investigate the effect of hydrophobicity on the charge reversal of colloidal particles, we measured and analyzed the electrophoretic mobility (EPM) of carboxyl latex particles in mixed electrolytes solutions containing potassium chloride KCl and tetraphenylphosphonium chloride TPPCl. Tetraphenylphosphonium (TPP +) ion strongly adsorbs on the particle surface due to its hydrophobicity, and thus causes the charge reversal/overcharging. Measurements of EPM were carried out as functions of pH, ionic strength, and the mixed molar ratio of X=[TPP + ]/[K + ] to unveil the influence of surface charge on hydrophobic interaction. Experimental EPM was analyzed by using 1-pK H Stern Gouy Chapmann model with the Ohshima equation including the relaxation effect or the Smoluchowski equation neglecting the relaxation effect for calculating theoretical EPM values. Our results demonstrate that carboxyl latex particles show charge reversal indicated by positive EPMs at low pH due to the accumulation of TPP + ions on the surface and the reversed EPM values at low pH are augmented with increasing the mixed molar ratio of X=[TPP + ]/[K + ]. Also, we observed that charge re-reversal at higher pH as the deprotonation of surface carboxyl groups proceeded. The pH at which the charge re-reversal occurred increased with increasing the mixed molar ratio. From the comparison between our experiments and theoretical analysis, we found that the intrinsic energy of adsorption decreases with increasing the surface charge density to describe the observed charge re-reversal. These results indicate that the intrinsic adsorption energy of TPP + , which is probably due to hydrophobic interaction, decreases with increasing the surface charge density.

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Electrophoretic mobility of carboxyl latex particles in the mixed solution of 1:1 and 2:1　electrolytes or 1:1 and 3:1 electrolytes: Experiments and modeling

Cited by 20 publications

References 33 publications

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

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

Estimation of characteristic coagulation time based on Brownian coagulation theory and stability ratio modeling using electrokinetic measurements

Electrophoretic mobility of carboxyl latex particles: effects of hydrophobic monovalent counter-ions

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Electrophoretic mobility of carboxyl latex particles in the mixed solution of 1:1 and 2:1 electrolytes or 1:1 and 3:1 electrolytes: Experiments and modeling

Cited by 20 publications

References 33 publications

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

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

Estimation of characteristic coagulation time based on Brownian coagulation theory and stability ratio modeling using electrokinetic measurements

Electrophoretic mobility of carboxyl latex particles: effects of hydrophobic monovalent counter-ions

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Electrophoretic mobility of carboxyl latex particles in the mixed solution of 1:1 and 2:1　electrolytes or 1:1 and 3:1 electrolytes: Experiments and modeling