Specific Ion Effects on Aggregation and Charging Properties of Boron Nitride Nanospheres
| Autor: | Lívia Vásárhelyi, Tímea Hegedűs, Dóra Takács, Zoltán Kónya, Istvan Szilagyi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
02 engineering and technology
Electrolyte 010402 general chemistry 01 natural sciences Article symbols.namesake Colloid chemistry.chemical_compound Electrochemistry Coagulation (water treatment) General Materials Science Spectroscopy chemistry.chemical_classification Valence (chemistry) Aqueous solution Chemistry Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Chemical engineering Boron nitride symbols van der Waals force Counterion 0210 nano-technology |
| Zdroj: | Langmuir |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | The charging and aggregation properties of boron nitride nanospheres (BNNSs) were investigated in the presence of electrolytes of different compositions and valences in aqueous suspensions. The influence of mono- and multivalent cations (counterions) and anions (coions) on the colloidal stability of the negatively charged particles was studied over a wide range of salt concentrations. For monovalent ions, similar trends were determined in the stability and charging of the particles irrespective of the salt composition, i.e., no ion-specific effects were observed. Once multivalent counterions were involved, the critical coagulation concentrations (CCCs) decreased with the valence in line with the direct Schulze-Hardy rule. The dependence indicated an intermediate charge density for BNNSs. The influence of the coions on the CCCs was weaker and the destabilization ability followed the inverse Schulze-Hardy rule. The predominant interparticle forces were identified as electrical double-layer repulsion and van der Waals attraction. These findings offer useful information to design stable BNNS dispersions in various applications, where mono- and multivalent electrolytes or their mixtures are present in the samples. |
| Databáze: | OpenAIRE |
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