Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals

Kunming, China

Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals

Kunming, China
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Kim Dan H.,Kunming University of Science and Technology | Kim Dan H.,Tuyhoa Industrial College | Zhou D.,Kunming University of Science and Technology | Zhou D.,Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals | And 10 more authors.
Optics and Laser Technology | Year: 2014

The glass and glass-ceramics samples with composition of 50SiO 2-10AlF3-(30-x)BaF2-5TiO2-3. 95LaF3- xMnCO3-0.05ErF3-1YbF3 (in mol%, x=0, 0.5, 0.8, 1.0, and 1.2) were prepared using the conventional quenching techniques. The effects of Mn2+ ions on the enhancement red upconversion emission of Mn2+/Er3+/Yb3+ tri-doped transparent glass-ceramics under the changing of heat treatment temperatures and concentrations of Mn2+ ions were investigated. The structural investigation carried out by X-ray diffraction (XRD), and transmission electron microscopy evidenced the formation of cubic Ba 2LaF7 nanocrystals. The efficiency upconversion emission of Mn2+/Er3+/Yb3+ tri-doped was observed in the glass-ceramics. The upconversion mechanism and energy transfer between Mn 2+-Yb3+ dimer and Er3+ ions were investigated. © 2014 Published by Elsevier Ltd.


Wang X.-X.,Kunming University of Science and Technology | Wang X.-X.,Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals | Wang X.-X.,Key Laboratory of Advanced Materials of Yunnan Province | Gan G.-Y.,Kunming University of Science and Technology | And 20 more authors.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

Oxymethylene solution (37%), cupric sulfate pentahydrate, ethylene diamine tetraacetic acid disodium salt (EDTA2Na), sodium potassium tartrate tetrahydrate, paladium chloride, sodium hydrate, and ammonia water were used as raw materials. By means of oxydic and deoxidized reactions of electroless plating with unoiling, coarsening, hypersensitization and activation, the oxydic and deoxidized Cu products were coated on the surface of micron ZnO powders, thus obtaining the Cu/ZnO composite powders. The preparation technologies and microscopic aspects of Cu/ZnO composite powders were studied in brief. The technological parameters were optimized through contrastive analyses and tests, namely, the optimal conditions of electroless plating are: cupric sulfate pentahydrate 22 g/L, oxymethylene solution (37%) 26 ml/L, temperature 50°C, pH value 12.


Song Z.,Kunming University of Science and Technology | Song Z.,Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals | Yin Z.,Kunming University of Science and Technology | Li C.,Kunming University of Science and Technology | And 9 more authors.
Materials Science and Engineering C | Year: 2012

An effective approach to fabricate porous bone regenerative composite scaffolds with surface-immobilized nano-hydroxyapatite (nHA) is developed in this research. In the typical preparation process, surface-repellent stable colloidal nHA with surface carbonyl functionality was fabricated through in-situ polyvinyl pyrrolidone (PVP)-grafting synthesis without any organic solvents and potentially harmful additives. Followed by freezing and lyophilizing homogenous PVP-grafted nHA and chitosan mixtures, three dimensional nHA and chitosan composite scaffolds were then obtained. The TEM images and XPS analysis show that the discrete nHA was anchored at nano-level on the pore surface of chitosan scaffold by mediating PVP chemical-linkage. The PVP-grafting offers an efficient and safe approach to prepare nHA with the surface reactivity and is promising to be widely used in the fabrication of novel composite scaffolds for bone tissue engineering. © 2012 Elsevier B.V. All rights reserved.


Song Z.,Kunming University of Science and Technology | Song Z.,Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals | Xu Y.,Kunming University of Science and Technology | Li C.,Kunming University of Science and Technology | And 12 more authors.
Ceramics International | Year: 2013

Eu3+-activated MgAl(PO4)O:phosphor has been synthesized by a high temperature solid state reaction and efficient red emission under near-ultraviolet excitation is observed. The emission spectrum shows a dominant peak at 594 nm due to the 5D0→ 7F1 transition of Eu3+. The excitation spectrum is coupled well with the emission of UV LED (350-410 nm). The effect of Eu 3+ concentration on the luminescent properties of MgAl(PO 4)O:Eu3+ and the mechanism of concentration quenching of Eu3+ are studied. The results show that MgAl(PO4)O:Eu 3+ is a promising red-emitting phosphor for white LEDs. © 2012 Elsevier Ltd and Techna Group S.r.l.


Zhang S.-L.,Kunming University of Science and Technology | Zhang S.-L.,Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals | Zhang S.-L.,Key Laboratory of Advanced Materials of Yunnan Province | Yuan J.,Kunming University of Science and Technology | And 20 more authors.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

The preparation of the hydrophobic and oleophobic ABS sheets by the auxiliary addition and template methods and its double lyophobic mechanism were studied. Through adding nanometer titanium dioxide and silicon dioxide as the auxiliary materials and the method that dissolved the micro/nano-Al on the surface of ABS-Al sheets to form pores, ABS sheets with low surface energy and micro/nano structure on the surface were formed. The contact angles of the formed ABS sheets with water and oil were measured by the contact angle measurement instrument. The surface morphologies of the ABS sheets were analyzed by SEM. The results show that ABS-Al sheets treated by diluted hydrochloric acid had the best hydrophobic characteristic with the contact angle of 117°, which is 67° greater than that of the un-treated ABS sheets. This is due to the diluted hydrochloric acid dissolved the Al particles on the surface of the ABS-Al sheets thus formed micro/nano structure with a rough surface morphology.


Li C.,Kunming University of Science and Technology | Song Z.,Kunming University of Science and Technology | Song Z.,Key Laboratory of Advanced Materials in Rare and Precious and Nonferrous Metals | Qiu J.,Kunming University of Science and Technology | And 12 more authors.
Journal of Luminescence | Year: 2012

Bismuth ions doped Ba 10(PO 4) 6Cl 2 was synthesized by solid state reaction and its spectral properties were investigated. The results showed that the samples prepared in air only presented typical ultraviolet (UV) luminescence of Bi 3+ at 370 nm, however broadband yellowwhite and near infrared (NIR) emission could be observed in the samples prepared in reductive atmosphere, indicating those broadband emissions are related to the presence of low valent bismuth species. Correlating excitation and emission data with the charge of available lattice sites suggest that Bi 3+ coexist with Bi 3+, and each locate on one of the two available Ba 2+ lattice sites. We propose that broadband yellowwhite and NIR emissions are ascribed to the related transitions of Bi 3+ ion. © 2012 Elsevier B.V.

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