Role of Nuclei in Liesegang Pattern Formation: Insights from Experiment and Reaction-Diffusion Simulation
| Autor: | Hideki Nabika, Kei Unoura, Qing Fang, Masaki Itatani |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Chemical models Nucleation Pattern formation Ag nanoparticles 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Surface energy 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy CHEMISTRY METHODS Chemical physics Reaction–diffusion system Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 122:3669-3676 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.7b12688 |
| Popis: | Many types of periodic patterns can spontaneously form in nature across wide spatiotemporal scales. Construction of a chemical model that mimics these periodic patterns are of considerable interest from both scientific and technological viewpoints. The Liesegang phenomenon is one of the chemical models to form periodic patterns with well-defined periodicity. However, the parameters that influence the mechanism and resultant pattern geometry are not completely known. In this study, we use surface chemistry methods to evaluate the influence of nucleation threshold on the geometry of Liesegang patterns. Cysteine was used as an additional ligand for the precursors (Agn nuclei and/or Ag nanoparticles in the present system) to reduce their surface free energy and thus the nucleation free energy. As a result, the formed Liesegang patterns had smaller spacing coefficient (i.e., finer periodic patterns), a phenomenon that was also reproduced using reaction-diffusion simulation with lowered nucleation threshold. Th... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|