Agglomeration of ZnS nanoparticles without capping additives at different temperatures

• Authors: Petr Praus , Richard Dvorský , Petr Kovář , Ladislav Svoboda
• Languages of publication: EN

Abstracts

EN

ZnS nanoparticles were precipitated in diluted aqueous solutions of zinc and sulphide ions without capping additives at a temperature interval of 0.5–20°C. ZnS nanoparticles were arranged in large flocs that were disaggregated into smaller agglomerates with hydrodynamic sizes of 70–150 nm depending on temperature. A linear relationship between hydrodynamic radius (R
a) and temperature (T) was theoretically derived as R
a =652 - 2.11 T.The radii of 1.9–2.2 nm of individual ZnS nanoparticles were calculated on the basis of gap energies estimated from their UV absorption spectra. Low zeta potentials of these dispersions of −5.0 mV to −6.3 mV did not depend on temperature. Interactions between individual ZnS nanoparticles were modelled in the Material Studio environment. Water molecules were found to stabilize ZnS nanoparticles via electrostatic interactions.

Keywords

EN

ZnS nanoparticles; Agglomeration; Low temperatures; Molecular modeling

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2014
• Volume: 12
• Issue: 3
• Pages: 312-317

Dates

published

1 - 3 - 2014

online

21 - 12 - 2013

Contributors

author

Petr Praus

• VŠB-Technical University of Ostrava

author

Richard Dvorský

• VŠB-Technical University of Ostrava

author

Petr Kovář

• Charles University in Prague, Faculty of Mathematics and Physics

author

Ladislav Svoboda

• VŠB-Technical University of Ostrava

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Identifiers

DOI

10.2478/s11532-013-0385-2