Pressure control as an effective method to modulate aggregative growth of nanoparticles
| Autor: | Yanglong Guo, Wangcheng Zhan, Xia Qian, Jian Xu, Guo-Jun Zhou, Yuan Shu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Atmospheric pressure 020502 materials Metals and Alloys Nucleation Nanoparticle Selective catalytic reduction Ag nanoparticles 02 engineering and technology Condensed Matter Physics chemistry.chemical_compound Adsorption 0205 materials engineering Chemical engineering chemistry Oleylamine Metallic materials Materials Chemistry Physical and Theoretical Chemistry |
| Zdroj: | Rare Metals. 40:1808-1816 |
| ISSN: | 1867-7185 1001-0521 |
| Popis: | Recent studies suggested that the interactions between particles can induce aggregative nucleation and growth processes beyond those predicted by the traditional LaMer model of nanoparticle formation, but their nucleation and growth processes are still unclear. Here, we report a simple way to control the interaction between nanoparticles by manipulating the oleylamine (OAm) adsorbed on the surface of the nanoparticles. The size distributions of Ag nanoparticles produced at different reaction pressures were monitored as evidence for aggregative growth. From these kinetic data, the aggregative nucleation rate (Γ) of primary Ag nanoparticles under a 0.01 MPa was demonstrated to be faster than that under atmospheric pressure. This leads to a higher uniformity of Ag nanoparticles in a shorter time (10 min) than that achievable with previous methods. Furthermore, Ag nanoparticles supported on TiO2 exhibited a remarkable performance in the catalytic reduction of 4-nitrophenol (4-NP). After 4 min, 4-NP was completely reduced into 4-aminophenol (4-AP). |
| Databáze: | OpenAIRE |
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