Interface Energy Measurement of MgO and ZnO: Understanding the Thermodynamic Stability of Nanoparticles


Autoria(s): CASTRO, Ricardo H. R.; TORRES, Ricardo B.; PEREIRA, Gilberto J.; GOUVEA, Douglas
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2010

Resumo

Nanomaterials have triggered excitement in both fundamental science and technological applications in several fields However, the same characteristic high interface area that is responsible for their unique properties causes unconventional instability, often leading to local collapsing during application Thermodynamically, this can be attributed to an increased contribution of the interface to the free energy, activating phenomena such as sintering and grain growth The lack of reliable interface energy data has restricted the development of conceptual models to allow the control of nanoparticle stability on a thermodynamic basis. Here we introduce a novel and accessible methodology to measure interface energy of nanoparticles exploiting the heat released during sintering to establish a quantitative relation between the solid solid and solid vapor interface energies. We exploited this method in MgO and ZnO nanoparticles and determined that the ratio between the solid solid and solid vapor interface energy is 11 for MgO and 0.7 for ZnO. We then discuss that this ratio is responsible for a thermodynamic metastable state that may prevent collapsing of nanoparticles and, therefore, may be used as a tool to design long-term stable nanoparticles.

Brazilian agency FAPESP

FEI University Center

Identificador

CHEMISTRY OF MATERIALS, v.22, n.8, p.2502-2509, 2010

0897-4756

http://producao.usp.br/handle/BDPI/18417

10.1021/cm903404u

http://dx.doi.org/10.1021/cm903404u

Idioma(s)

eng

Publicador

AMER CHEMICAL SOC

Relação

Chemistry of Materials

Direitos

restrictedAccess

Copyright AMER CHEMICAL SOC

Palavras-Chave #SURFACE-ENERGY #GRAIN-BOUNDARY #WATER-ADSORPTION #DIHEDRAL ANGLES #PHASE-STABILITY #GROWTH #ZIRCONIA #ALUMINA #NANOTHERMODYNAMICS #NANOMATERIALS #Chemistry, Physical #Materials Science, Multidisciplinary
Tipo

article

original article

publishedVersion