Zeta potentials of monodispersed, spherical silica particles in mixed solvents as a function of cesium chloride concentration

Kosmulski, Marek; Eriksson, Patrik; Brancewicz, Chris; Rosenholm, Jarl B.

doi:10.1016/s0927-7757(99)00027-8

Cited by 19 publications

(9 citation statements)

References 13 publications

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“…Thus, modification of the silica surface with silanes has great effect on the zeta potential. Analysis of this effect for selected silanes has been reported in other papers (Kosmulski and Eriksson, 2000;Tsai and Wu, 2004;Alkan et al, 2005a, b, c;Demirbaş et al, 2007;Jesionowski et al, 2010).…”

Section: Introductionmentioning

confidence: 63%

Electrokinetic properties of hybrid pigments obtained via adsorption of organic dyes on the silica support

Jesionowski

Nowacka

Ciesielczyk

2012

Pigment &Amp; Resin Technology

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Purpose -The purpose of this paper is to characterise the electrokinetic properties of pigments supported on both unmodified and modified silica. The paper describes the preparation of hybrid pigments via adsorption of organic dyes on silica supports and determination of the zeta potential and electrophoretic mobility of the materials obtained. Design/methodology/approach -The materials studied were hybrid pigments obtained as a result of adsorption of two basic dyes: C.I. Basic Red 1 and C.I. Basic Orange 14 and one acidic dye C.I. Mordant Red 3 from solutions of concentrations of 500, 2,000 and 3,000 mg/dm 3 on the surface of both unmodified and modified silica supports. The agent used for modification of the silica surface was N-2-(aminoethyl)-3-aminopropyltrimethoxysilane. Findings -The modification of the silica surface with aminosilane was found to change, significantly, the electrokinetic character of the inorganic support. This change was interpreted as being due to the ionisation of ZNH 2 groups from the modifier molecule, which changes the surface charge. Electrokinetic curves of the pigment composites changed considerably as a function of the type and concentration of the organic dye adsorbed. Research limitations/implications -Only SiO 2 supports (unmodified and aminosilane-grafted) and C.I. Basic Red 1, C.I. Basic Orange 14 or C.I. Mordant Red 3 dyes adsorbed on its surface were evaluated. Other dyes could also be studied. Practical implications -Measurements of the zeta potential were used to characterise the stability of colloidal dispersions of paints or dyes and to control the stability of paints on storage and their performance on painting and drying. Originality/value -The paper demonstrates that the measurements of zeta potential permit determination of the optimum conditions for the use of a given pigment. The finding of the change of the zeta potential of a given pigment and so, also its application properties as a result of different functional groups in the dye or the modifying agent molecules.

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Section: Introductionmentioning

confidence: 63%

Electrokinetic properties of hybrid pigments obtained via adsorption of organic dyes on the silica support

Jesionowski

Nowacka

Ciesielczyk

2012

Pigment &Amp; Resin Technology

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“…It is known from the literature that p K a of chemical groups depends on the solvent, − so that a surface can be characterized by effective charge density that is modulated by the medium it is exposed to. Nonaqueous capillary electrophoresis, as well as ionic conductance experiments through porous media and zeta potential measurements of particles provided evidence that p K a values changed with the change of the solvent and solvent mixtures. Surface properties in mixtures of solvents depend on the relative ratio of the solvents and can be further modulated by the addition of salt.…”

Section: Introductionmentioning

confidence: 98%

“…The role of salt is typically described by the screening effectas the salt concentration increases, the zeta potential of the surface decreases. There was also a surprising experiment reported, which showed that Cs + ions had an ability to invert silica surface potential from negative to positive but only in solvents with a dielectric constant lower than 25 …”

Section: Introductionmentioning

confidence: 99%

“…There was also a surprising experiment reported, which showed that Cs + ions had an ability to invert silica surface potential from negative to positive but only in solvents with a dielectric constant lower than 25. 41 In this manuscript, we explore properties of a polymer carboxylated surface whose effective charge can be modulated as well as inverted from negative to positive in LiClO 4 solutions in organic solvents with dielectric constant that is higher or lower than 25. The method we apply enables probing surface charge properties not only as a function of the solvent and salt concentration but also as a function of voltage, thus providing a direct link between surface charge properties and electrokinetic phenomena.…”

Section: ■ Introductionmentioning

confidence: 99%

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Electrokinetic Phenomena in Organic Solvents

2019

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Solid/liquid interfaces play a key role in separation processes, energy storage devices, and transport in nanoscale systems. Nanopores and mesopores with well-defined geometry and chemical characteristics have been a valuable tool to unravel electrochemical properties of interfaces, but the majority of studies have been focused on aqueous solutions. Here, we present experiments and numerical modeling aimed at characterizing effective surface charge of polymer pores in mixtures of water and alcohols as well as in propylene carbonate and acetone. The charge properties of pore walls are probed through analysis of current–voltage curves recorded in the presence of salt concentration gradients. The presence and direction of electro-osmotic flow lead to asymmetric current–voltage curves, with rectification characteristics determined by the polarity of surface charge. The results suggest that the effective surface charge of the pore walls depends not only on the type of solvent but also on the concentration of the electrolyte and voltage. We identified conditions at which polymer pores that are negatively charged in aqueous solutions become positively charged in propylene carbonate and acetone. The findings are of importance for nonaqueous separations, fundamental knowledge on solid/liquid interfaces in organic media, and preparation of porous devices with tunable surface charge characteristics.

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“…Permanently anchoring nanoparticles on various oxide nanospheres can be achieved for a number of transition metals by direct reduction of organometallic complexes of the type [Li(THF) 2 ] 2 AE [MR 4 ], with ''THF'' being C 4 H 8 O (tetrahydrofurane), ''M'' being Ni, Pt, Pd, and ''R'' being CH 3 (methyl) or C 6 H 6 (phenyl) ligands, on oxide surfaces of well defined hydroxyl concentration [36,37,52]. Therefore, understanding of structural and functional characteristics of the oxide surface [55][56][57][58][59][60][61] in dependence on pretreatment, modification and metal loading is important.…”

Section: Introductionmentioning

confidence: 99%

Structural characteristics of oxide nanosphere supported metal nanoparticles

et al. 2007

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Structural characterization by transmission electron microscopy of metal nanoparticle coatings on oxide nanospheres has been employed to point out the potential of such materials for use as porous support model catalysts. On silica and titania nanospheres of various origins surface-mediated metal deposition at mild temperature conditions has been utilized to fabricate Pt, Pd, Ag, and Au nanoparticle coatings on the oxide supports. Promising coating characteristics have been achieved for Ag and Au nanoparticles by direct reduction on terminating hydroxyl-rich Sto¨ber silica. A high-resolution electron microscopy analysis directed to surface stress, lattice contraction and planar lattice defects of the latter particles revealed no strong metal-support interaction.

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Zeta potentials of monodispersed, spherical silica particles in mixed solvents as a function of cesium chloride concentration

Cited by 19 publications

References 13 publications

Electrokinetic properties of hybrid pigments obtained via adsorption of organic dyes on the silica support

Electrokinetic properties of hybrid pigments obtained via adsorption of organic dyes on the silica support

Electrokinetic Phenomena in Organic Solvents

Structural characteristics of oxide nanosphere supported metal nanoparticles

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