ORCID Profile
0000-0002-3067-9582
Current Organisations
Chongqing University
,
Institute of Metal Research Chinese Academy of Sciences
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Publisher: American Chemical Society (ACS)
Date: 08-11-2008
DOI: 10.1021/JP807580T
Publisher: American Chemical Society (ACS)
Date: 10-12-2020
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2008
DOI: 10.1142/S1793292008000976
Abstract: Incorporating the bond–order–length–strength correlation mechanism [C. Q. Sun, Prog. Solid State Chem.35, 1 (2007)] and Born's criterion for melting [J. Chem. Phys.7, 591 (1939)] into the conventional Hall–Petch relationship has turned out an analytical expression for the size and temperature dependence of the mechanical strength of nanograins, known as the inverse Hall–Petch relationship (IHPR). Reproduction of the measured IHPR of Ni , NiP , and TiO 2 nanocrystals revealed that: (i) the competition between the size-induced energy–density gain and atomic cohesive energy loss in the surface skins of nanograins originate from the IHPR (ii) the competition between the activation and inhibition of atomic dislocations motion activate the entire IHPR behavior (iii) the bond nature involved and the T/T m ratio between the temperature of operating and the temperature of melting dictate the measured strongest sizes of a given specimen (iv) a quasimolten phase present before melting determines the size-induced softening and the superplasticity of nanostructures.
Publisher: AIP Publishing
Date: 04-2011
DOI: 10.1063/1.3569743
Abstract: As a group of wonder materials, gold and silver at the nanoscale demonstrate many intriguing properties that cannot be seen from their bulk counterparts. However, consistent insight into the mechanism behind the fascinations and their interdependence given by one integrated model is highly desirable. Based on Goldschmidt-Pauling’s rule of bond contraction and its extension to the local bond energy, binding energy density, and atomic cohesive energy, we have developed such a model that is able to reconcile the observed size dependence of the lattice strain, core level shift, elastic modulus, and thermal stability of Au and Ag nanostructures from the perspective of skin-depth bond order loss. Theoretical reproduction of the measured size trends confirms that the undercoordination-induced local bond contraction, bond strength gain, and the associated binding energy density gain, the cohesive energy loss and the tunable fraction of such undercoordinated atoms dictate the observed fascinations, which should shed light on the understanding of the unusual behavior of other nanostructured materials as well.
Publisher: Elsevier BV
Date: 05-2017
Publisher: Hindawi Limited
Date: 2015
DOI: 10.1155/2015/829367
Publisher: Elsevier BV
Date: 12-2016
Publisher: IOP Publishing
Date: 12-2008
Publisher: Inderscience Publishers
Date: 2002
Publisher: American Chemical Society (ACS)
Date: 10-10-2008
DOI: 10.1021/JP8063068
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B915099D
Abstract: Synthesis of metal molybdates (XMoO(4), X = Ca, Sr, Ba) have received much attention recently because of their interesting structural and luminescent properties. Here novel erythrocyte-like CaMoO(4) hierarchical nanostructures are synthesized via a simple surfactant-free hydrothermal route. The formation of the calcium molybdate erythrocytes is controllable through adjusting the fundamental experimental parameters including reaction time, temperature and DMAc to H(2)O ratio. The as-synthesized products are characterized using X-ray powder diffraction, scanning electron microscopy, Brunauer-Emmett-Teller and transmission electron microscopy. The results show that the nucleation and growth of the novel erythrocyte-like CaMoO(4) hierarchical nanostructures are governed by an oriented attachment growth mechanism. The luminescent properties of the CaMoO(4) erythrocytes are then studied using a spectrophotometer and the erythrocyte-like CaMoO(4) nanostructures display a strong blue emission. This study provides an easy surfactant-free synthetic route for the controllable construction of inorganic materials with high hierarchy in the absence of any surfactants.
Publisher: Elsevier BV
Date: 08-1999
Location: China
No related grants have been discovered for Shao-Yun Fu.