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- Title
The Size Dependence of Dissolution Thermodynamics of Nanoparticles.
- Authors
Wang, Zhi-Qiang; Xue, Yong-Qiang; Cui, Zi-Xiang; Duan, Hui-Juan; Xia, Xiao-Yan
- Abstract
Dissolution of nanoparticles is involved in the preparation, research and application of nanomaterials, but there is a surprising difference in dissolution thermodynamics between nanoparticles and the corresponding bulk materials. In the paper, the relations of dissolution thermodynamic properties, equilibrium constant of nanoparticles, respectively, and particle size were derived by introducing interface variables and the surface chemical potential. Experimentally, the solubility of nano-barium sulfate with different average particle sizes at different temperatures were determined by the method of electrical conductivity, obtaining the influencing regularities of particle size on the dissolution thermodynamic properties and the equilibrium constant. The regularities are in accordance with the theory. The results show that there are remarkable effects of particle size of nanoparticles on the dissolution thermodynamic properties and the equilibrium constant; with the decreasing of the size of nanoparticles, the dissolution equilibrium constant increases, while the standard dissolution Gibbs free energy, the standard dissolution enthalpy and the standard dissolution entropy decrease; and the logarithm of the dissolution equilibrium constant, the standard dissolution Gibbs free energy, the standard dissolution enthalpy and the standard dissolution entropy are linearly associated with the reciprocal of particle size, respectively. This new theory provides a quantitative description of nanoparticles dissolution behavior, and has important scientific significance for understanding and predicting of thermodynamic regularity of dissolution concerned in the preparation, researches and applications of nanomaterials. The size dependence of equilibrium constant and dissolution thermodynamic properties were analyzed theoretically and studied experimentally, and the experimental results agree with the theoretical analysis. Therefore, the theoretical analysis and the influence regularities describing the size-dependent dissolution thermodynamics of nanoparticles can quantitatively provide guidance for the better and broader applications of nanomaterials.
- Subjects
DISSOLUTION (Chemistry); THERMODYNAMICS; NANOPARTICLE size; BULK solids; EQUILIBRIUM constant (Chemistry)
- Publication
NANO, 2016, Vol 11, Issue 9, p-1
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292016501009