Secondary Particle Formation during the Nonaqueous Synthesis of Metal Oxide Nanocrystals
| Autor: | Klaus Huber, Pierre Stolzenburg, Benjamin Hämisch, Sebastian Richter, Georg Garnweitner |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Economies of agglomeration Nucleation Population balance equation Nanoparticle 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surface energy 0104 chemical sciences Colloid Particle aggregation Chemical engineering Electrochemistry Particle General Materials Science 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 34(43) |
| ISSN: | 1520-5827 |
| Popis: | This study aims to elucidate the aggregation and agglomeration behavior of TiO2 and ZrO2 nanoparticles during the nonaqueous synthesis. We found that zirconia nanoparticles immediately form spherical-like aggregates after nucleation with a homogeneous size of 200 nm, which can be related to the metastable state of the nuclei and the reduction of surface free energy. These aggregates further agglomerate, following a diffusion-limited colloid agglomeration mechanism that is additionally supported by the high fractal dimension of the resulting agglomerates. In contrast, TiO2 nanoparticles randomly orient and follow a reaction-limited colloid agglomeration mechanism that leads to a dense network of particles throughout the entire reaction volume. We performed in situ laser light transmission measurements and showed that particle formation starts earlier than previously reported. A complex population balance equation model was developed that is able to simulate particle aggregation as well as agglomeration, wh... |
| Databáze: | OpenAIRE |
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