Transactions of Nonferrous Metals Society of China,2015年25(11):3651-3656 ISSN：1003-6326
[刘刚] Cent S Univ, Xiangya Hosp, Dept Hepatobiliary, Changsha 410008, Hunan, Peoples R China.;[刘刚] Cent S Univ, Xiangya Hosp, Enter Surg Res Ctr, Changsha 410008, Hunan, Peoples R China.;[刘刚; 孙维佳] Cent S Univ, Xiangya Hosp, Dept Gen Surg, Changsha 410008, Hunan, Peoples R China.;[梁叔全; 唐莎莎; 刘军] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
[Sun, Wei-jia] Cent S Univ, Xiangya Hosp, Dept Gen Surg, Changsha 410008, Hunan, Peoples R China.
nanometer materials;lithium-ion batteries;molten salt reaction;energy materials;nano-coating
A cost-effective carbon-free nanocoating strategy was developed for the synthesis of ultra-fine SnO_2 coating α-Fe_2O_3 core-shell nanoparticles. This strategy only involves a two-step molten salt reaction at low temperature of 300 °C. The as-prepared α-Fe_2O_3@SnO_2 core-shell nanocomposites show enhanced electrochemical performances than the bare α-Fe_2O_3 nanoparticles. This involved metal oxide nanocoating method is easy to be carried out, and the heat treatment temperature is much lower than that of other traditional solid-state annealing method and many carbon or metal oxide nanocoating methods. The molten salt method may also be used to produce other metal oxides coating nanostructures as the electrode materials for lithium-ion batteries.
The chromaticity of the Cu-12Mn-13Zn-1Sn-1Al-0.1Si-0.1Ce (wt.%) alloy was tested using a BYK color difference meter and calculated following the CIE 1976LAB standard system. The value of L*, a* and b* was 70.02, 0.6 and 7.2 respectively. The hot deformation behavior was tested on a Gleeble-1500 thermal simulator, at different deforming temperatures with varying strain rates. The stress-strain behavior of the alloy was obtained, the thermal deformation activation energy Q was calculated, the processing maps were established, and the microstructures evolution of the alloy during hot deformation was characterized. With the true strain of 0.7, two unstable zones were found to be located at 600-650 degrees C with the strain rate of 0.56-10 s(-1), and 780-800 degrees C with the strain rate of 0.56-10 s(-1). The cold workability of the alloy and its annealing schedule have also been studied. Eventually, the cold rolling deformation approaches 75%, and the available annealing temperature stays in a wide range. (C) 2012 Elsevier B.V. All rights reserved.
[Liang, Shuquan; Wang, Mingpu; Xiong, Shiyun; Li, Yejun; Qi, Weihong; Li, Zhou] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Liang, Shuquan; Wang, Mingpu; Qi, Weihong; Li, Zhou] Minist Educ, Key Lab Nonferrous Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Huang, Baiyun] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
[Qi, Weihong] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
The size-temperature phase diagram of titanium nanoparticles has been obtained by calculating the corresponding Gibbs free energies of the FCC, BCC and HCP structures. It is found that these structures can transform from one into the other at specific sizes and temperature ranges, which is consistent with the available data reported in the literatures. Most importantly, we firstly predict that titanium particles with BCC structure can change to the FCC one in the size range 8.1–27.3 nm and in the temperature range 1156–1715 K.
The microstructure transition, shape memory effect, machinability and mechanical property of the CuAlMnZn alloy with and without Te have been studied using X-ray diffraction analysis, chips observation and scanning electron microscopy (SEM), tensile strength test and differential scanning calorimeter (DSC), and semi-quantitative shape memory effect (SME) test. The particles with richer Te dispersedly distributed in grain interior and boundary with size of 2-5 mu m. After the addition of Te, the CuAlMnZnTe alloy machinability has been effectively increased to approach that of BZn15-24-1.5 and its shape memory property remains the same as the one of CuAlMnZn alloy. The CuAlMnZn shape memory alloys with and without Te both have good ductility as annealed at 700 degrees C for 15 min. (C) 2011 Elsevier B.V. All rights reserved.
Dendronized polyamides of generations 1 and 2 were grafted with ethylenediamine (en) ligands at their peripheries by the condensation of chloromethyl groups and en molecules. The obtained dendronized complexes were further equipped with MoO(2)acac(2) to form the catalysts PGn-en-Mo. The results of FT-IR and thiocyanate photometric analysis confirmed the successful immobilization of Mo catalysts on dendronized polyamides. The catalytic properties of PGn-en-Mo were first studied in the epoxidation of cyclohexene with tert-butyl hydroperoxide and exhibited high catalytic activity and selectivity. (C) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 128: 642-646, 2013