Institute of Physics of Materials AS CR, v. v. i. > Projects > The role of stress state and vacancy supersaturation at the formation of binary hollow nanoparticles
The role of stress state and vacancy supersaturation at the formation of binary hollow nanoparticles
| Investigator | RNDr. Jiří Svoboda, CSc., DSc. |
| Number of Project | P108-10-1781 |
| Agency | Grantová agentura České republiky |
| Duration | 2009-12-31 - 2012-12-30 |
Anotace |
| The formation of hollow nanospheres by means of gas-solid reaction of metallic nanospheres with an external gas atmosphere is a well known problem. From the experimental studies it is evident that the formation of a hollow nanosphere of stoichiomentric phase MpXq must be preceded by the formation of a sufficiently thick MpXq nanoshell on the metallic core of phase M. The developed theoretical models assume that a significant supersaturation of vacancies and/or a very high hydrostatic stress are built up in the M core due to Kirkendall effect, which leads to the nucleation of a hollow by vacancy condensation. The developed models indicate that the building of the very high hydrostatic stress in the M core is decisive for the hollow nucleation. |
