Charging and aggregation of negatively charged colloidal latex particles in the presence of multivalent oligoamine cations

Szilágyi, István; Połomska, Anna; Citherlet, Damian; Sadeghpour, Amin; Borkovec, Michal

doi:10.1016/j.jcis.2012.09.058

Cited by 36 publications

(40 citation statements)

References 45 publications

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“…For the first two anions, only one CCC was observed since restabilization did not occur ( Fig. 38,39,73 As discussed above, multivalent ions are more powerful in the destabilization of MgAl-NO 3 -LDH suspensions. The first CCC decreases with the valence due to the increasing affinity and stronger adsorption on the MgAl-NO 3 -LDH surface.…”

Section: Effect Of Multivalent Anionsmentioning

confidence: 79%

“…different compositions are widely used to capture these anions in water purification processes, 12,13 their effect on colloidal stability has not been studied in detail to date. Such a restabilization effect is typically induced by polyelectrolytes and multivalent ions in the presence of oppositely charged colloidal particles 15,38,39,61,73 and can be explained as follows. 5A).…”

Section: Effect Of Divalent Anionsmentioning

confidence: 99%

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Ion specific effects on the stability of layered double hydroxide colloids

et al. 2016

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Positively charged layered double hydroxide particles composed of Mg(2+) and Al(3+) layer-forming cations and NO3(-) charge compensating anions (MgAl-NO3-LDH) were synthesized and the colloidal stability of their aqueous suspensions was investigated in the presence of inorganic anions of different charges. The formation of the layered structure was confirmed by X-ray diffraction, while the charging and aggregation properties were explored by electrophoresis and light scattering. The monovalent anions adsorb on the oppositely charged surface to a different extent according to their hydration state leading to the Cl(-) > NO3(-) > SCN(-) > HCO3(-) order in surface charge densities. The ions on the right side of the series induce the aggregation of MgAl-NO3-LDH particles at lower concentrations, whereas in the presence of the left ones, the suspensions are stable even at higher salt levels. The adsorption of multivalent anions gave rise to charge neutralization and charge reversal at appropriate concentrations. For some di, tri and tetravalent ions, charge reversal resulted in restabilization of the suspensions in the intermediate salt concentration regime. Stable samples were also observed at low salt levels. Particle aggregation was fast near the charge neutralization point and at high concentrations. These results, which evidence the colloidal stability of MgAl-NO3-LDH in the presence of various anions, are of prime fundamental interest. These are also critical for applications to develop stable suspensions of primary particles for water purification processes, with the aim of the removal of similar anions by ion exchange.

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Section: Effect Of Multivalent Anionsmentioning

confidence: 79%

Section: Effect Of Divalent Anionsmentioning

confidence: 99%

Ion specific effects on the stability of layered double hydroxide colloids

et al. 2016

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“…The good agreement between surface potentials obtained from electrophoresis at two different particle concentrations for N6 suggests that the adsorbed amount is negligible with respect to the amount in solution. 51,52 Correspondingly, the total concentration in these experiments corresponds to the free concentration in solution. Deviations occur only at concentrations below 10 −6 M, where the adsorbed amount is no longer negligible with respect to the total amount of N6.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Forces between Negatively Charged Interfaces in the Presence of Cationic Multivalent Oligoamines Measured with the Atomic Force Microscope

et al. 2015

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The colloidal probe technique was used to accurately measure forces between water–solid interfaces of negatively charged latex particles in aqueous solutions of linear, cationic oligoamines of different valence up to roughly +4. These measurements were realized between pairs of particles with the atomic force microscope. Monovalent and divalent amines behave as simple electrolytes, and the forces are dominated by double layer repulsion at low concentrations and van der Waals attraction at high concentrations, as suggested by the classical theory by Derjaguin, Landau, Verwey, and Overbeek (DLVO). Additional attractive non-DLVO force of a short range can be evidenced, and its origin is attributed to hydrophobic interaction between the surfaces. Trivalent and tetravalent oligoamines induce a charge reversal and equally an additional attractive non-DLVO force. The charge reversal originates from the adsorption of these oligoamines to the particle surface. The additional non-DLVO force is more long-ranged than the ones observed in the presence of amines of low valence. This additional attraction is probably related to ion–ion correlations, existing surface heterogeneities, and the chainlike nature of the amines investigated

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“…39,40 Similar stability behaviour was reported for the aggregation of latex particles in the presence of multivalent ions or short-chain oligoamines. 65,66 In particular, the similarity to the system with the oligoamines is striking, and deservers further discussion. 66 These authors have studied electrophoresis and particle aggregation rates for negatively charged sulfate latex particles in the presence of aliphatic oligoamines with the structural formula H 2 NCH 2 CH 2 (NHCH 2 CH 2 ) n NH 2 for n = 0, 1, 2, and 4.…”

Section: Effect Of the Alkyl Chain Lengthmentioning

confidence: 99%

Charging and aggregation of latex particles in aqueous solutions of ionic liquids: towards an extended Hofmeister series

Oncsik

Désert

Trefalt

et al. 2016

Phys. Chem. Chem. Phys.

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The effect of ionic liquid (IL) constituents and other monovalent salts on the stability of polystyrene latex particles was studied by electrophoresis and light scattering in dilute aqueous suspensions. The surface charge and the aggregation rate were both sensitive to the type of ion leading to different critical coagulation concentration (CCC) values. Systematic variation of the type of IL cation and anion allows us to place these ions within the Hofmeister series. We find that the dicyanoamide anion should be placed between iodide and thiocyanate, while all 1-alkyl-3-methylimidazolium cations can be positioned to the left of the tetramethylammonium and ammonium ions. The hydrophobicity of the 1-butyl-1-methylpyrrolidinium (BMPL(+)) ion is intermediate between 1-ethyl-3-methylimidazolium (EMIM(+)) and 1-butyl-3-methylimidazolium (BMIM(+)). With increasing alkyl chain length, the 1-alkyl-3-methylimidazolium cations adsorb on the latex particles very strongly, and 1-hexyl-3-methylimidazolium (HMIM(+)) and 1-octyl-3-methylimidazolium (OMIM(+)) lead to pronounced charge reversal and to an intermediate restabilization region.

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Charging and aggregation of negatively charged colloidal latex particles in the presence of multivalent oligoamine cations

Cited by 36 publications

References 45 publications

Ion specific effects on the stability of layered double hydroxide colloids

Ion specific effects on the stability of layered double hydroxide colloids

Forces between Negatively Charged Interfaces in the Presence of Cationic Multivalent Oligoamines Measured with the Atomic Force Microscope

Charging and aggregation of latex particles in aqueous solutions of ionic liquids: towards an extended Hofmeister series

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