The use of zeta potential measurements in inorganic ion exchange studies

Rãutiu, R.; White, David A.; Adeleye, S. A.; Adkins, L. R.

doi:10.1016/0304-386x(94)90062-0

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…Finally, there exists a paper claiming zeta potential measurements of zeolites; however, the materials under investigation are various clays and ceramic precursors. None of the samples inspected, actually, is a zeolite …”

Section: Introductionmentioning

confidence: 99%

“…None of the samples inspected, actually, is a zeolite. 5 Obviously, the studies published so far 3,4 have been devoted to a few zeolite samples selected for specific applications. In view of the great variety of zeolites with respect to, for instance, lattice and pore structures, crystal sizes and morphologies, chemical compositions, and ion exchange properties, it is difficult to interpret the data available, and it is not yet possible to identify possible trends.…”

Section: Introductionmentioning

confidence: 99%

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Aggregation and Peptization Behavior of Zeolite Crystals in Sols and Suspensions

Maurer

Müller

Kraushaar‐Czarnetzki

2001

Ind. Eng. Chem. Res.

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Many catalyst shaping procedures such as spray drying or extrusion involve aggregation of zeolite crystals with particles of the binder or matrix in the liquid phase. A better control of these processes should result in catalyst bodies with improved diffusional and mechanical properties. We have studied the attractive and repulsive interactions between zeolite crystals in aqueous sols and suspensions by monitoring the zeta ( ) potential and the mean aggregate size at varying pH values. The zeolites under investigation were of the structure types MFI, *BEA, and OFF, with single-crystal diameters ranging from 65 to 3500 nm and with Si/Al ratios between 5 and >2000. The following major observations were made: (i) at the isoelectric point (IEP, defined as the pH at which ) 0 mV), zeolites undergo spontaneous aggregation; (ii) framework aluminum causes a shift of the IEP to lower pH values; (iii) the IEP shifts to very low values as the template of zeolites containing aluminum is removed; and (iv) aggregation and peptization are completely reversible. Among the samples under investigation, no effect of the structure type could be observed. The size of the crystals can affect the slope of the -potential curve as a function of the pH, but not the position of the IEP.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aggregation and Peptization Behavior of Zeolite Crystals in Sols and Suspensions

Maurer

Müller

Kraushaar‐Czarnetzki

2001

Ind. Eng. Chem. Res.

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“…z-potential measurements were performed according to the electrophoretic technique [14] using a Zeta Master (Malvern Instruments). An aqueous 0.001 M KNO 3 solution, which is generally taken as an inert electrolyte for zeta potential experiments [15], was prepared and a small amount of oxide was added in order to measure the zeta potential of the oxides therein. Different amounts of ImiH were added into the solution to investigate the effect of ImiH on the zeta potential of the oxides.…”

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confidence: 99%

Heterogeneous Doping of a Weak Covalent Electrolyte: Proton Conductivity Enhancement of Imidazole by Admixture of Oxide Particles

et al. 2008

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The proton conductivity of composites comprising dispersions of various types of nanometer‐sized oxide particles in pure imidazole is investigated. The composite materials show significantly enhanced (up to a maximum of ten times in the case of sZrO2) ionic conductivity compared to pure imidazole. The reason is the formation of a space–charge layer on the oxide surface, as a consequence of adsorptive interaction.

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“…The strength of the medium needs to be equilibrated by use of some salts, e.g., KNO 3 , as some materials that can develop charges upon small additions of acid or base used to arrange pH of the medium can influence the medium pH greatly. Therefore, zeta potential measurements were generally performed in salt solutions with low concentrations such as 1-100 mM [27]. Intensity (counts) Moreover, the XRD pattern comparison of the g-C 3 N 4 and 5PDA@g-C 3 N 4 structures are also given in Figure 3b.…”

Section: Resultsmentioning

confidence: 99%

Polydopamine Coating of Graphitic Carbon Nitride, g-C3N4, Improves Biomedical Application

Sahiner,

Demirci,

Sahiner

2024

Biomedicines

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Graphitic carbon nitride (g-C3N4) is an intriguing nanomaterial that exhibits photoconductive fluorescence properties under UV–visible light. Dopamine (DA) coating of g-C3N4 prepared from melamine was accomplished via self-polymerization of DA as polydopamine (PDA). The g-C3N4 was coated with PDA 1, 3, and 5 times repeatedly as (PDA@g-C3N4) in tris buffer at pH 8.5. As the number of PDA coatings was increased on g-C3N4, the peak intensity at 1512 cm−1 for N–H bending increased. In addition, the increased weight loss values of PDA@g-C3N4 structures at 600 °C from TGA thermograms confirmed that the coating was accomplished. The band gap of g-C3N4, 2.72 eV, was reduced to 0.87 eV after five coatings with PDA. A pristine g-C3N4 was found to have an isoelectric point (IEP) of 4.0, whereas the isoelectric points of 1PDA@g-C3N4 and 3PDA@g-C3N4 are close to each other at 3.94 and 3.91, respectively. On the other hand, the IEP of 5PDA@g-C3N4 was determined at pH 5.75 assuming complete coating with g-C3N4. The biocompatibility of g-C3N4 and PDA@g-C3N4 against L929 fibroblast cell lines revealed that all PDA@g-C3N4 coatings were found to be biocompatible up to a 1000 mg/mL concentration, establishing that PDA coatings did not adversely affect the biocompatibility of the composite materials. In addition, PDA@g-C3N4 was screened for antioxidant potential via total phenol content (TPC) and total flavonoid content assays and it was found that PDA@g-C3N4 has recognizable TPC values and increased linearly with an increased number of PDA coatings. Furthermore, blood compatibility of pristine g-C3N4 is enhanced considerably upon PDA coating, affirmed by hemolysis and the blood clotting index%. Additionally, α-glucosidase inhibitory properties of PDA@g-C3N4 structures revealed that 67.6 + 9.8% of this enzyme was evenly inhibited by 3PDA@g-C3N4 structure.

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The use of zeta potential measurements in inorganic ion exchange studies

Cited by 12 publications

References 6 publications

Aggregation and Peptization Behavior of Zeolite Crystals in Sols and Suspensions

Aggregation and Peptization Behavior of Zeolite Crystals in Sols and Suspensions

Heterogeneous Doping of a Weak Covalent Electrolyte: Proton Conductivity Enhancement of Imidazole by Admixture of Oxide Particles

Polydopamine Coating of Graphitic Carbon Nitride, g-C3N4, Improves Biomedical Application

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