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Dong Z.,Zhejiang University | Ren Z.,Zhejiang University | Wu C.,Zhejiang California International Nano Systems Institute | Pan C.,Zhejiang California International Nano Systems Institute | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2013

Nano-composite sols were prepared using methyltrimethoxysilane as a precursor and commercial silica sols and boehmite sols as nano-phase materials, and the anti-corrosion coatings were deposited on the surface of aluminium plates via a spin method. The effect of curing temperature on the structure and performance of the composite coatings was investigated by thermogravimetry-differential thermal analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, electrochemical impedance spectroscopy and contact angle measurement, respectively. The results show that the composite coatings are stable at <400 °C, and the methyl group (-CH3) in the coatings decomposes gradually at > 400 °C. The coating thickness is 10 (m. The coating prepared in the curing temperature range of 120-240 °C is dense. The coating can crack at 640 °C. The contact angle of the coating decreases from 106°to 20°, the pencil hardness of the coating increases from 3H to 6H, and the adhesion, impact strength and impedance of coatings firstly increases and then decreases with increasing the curing temperature. The optimum impact strength and impedance of the coating obtained at 180 °C are 45 cm/kg and 2.95 × 103(·cm2, respectively.


Li P.,Zhejiang University | Ding X.,Zhejiang University | Ding X.,Zhejiang California International Nano Systems Institute | Yang H.,Zhejiang University | And 3 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2012

The zirconolite-based glass-ceramics were prepared with SiO 2, Al 2O 3, B 2O 3, CaO, TiO 2 and ZrO 2 as raw materials and CeO 2 of 3% (in mass fraction, the same below) as simulated nuclide by a melting method for the disposal of actinides-containing radioactive waste solidification. The glass-ceramics obtained after heat treatments were characterized by X-ray diffraction and field emission scanning electron microscopy, respectively. The leaching resistance performance of glass-ceramics was analyzed via inductively coupled plasma mass spectra. The results show that the zirconolite crystals in the glass-ceramics could be more readily formed by lower mass fraction of TiO 2 and ZrO 2 at B 2O 3 of 12.5%. Single crystalline phase of zirconolite could be easily formed at the same crystallization temperature and with 8.33% B 2O 3, and the glass-ceramics had better leaching resistance performances, its normalized leaching rate of Ce remained at 10 -6 of magnitude after 7 d with the product consistency test method, and the curing effect was obvious.


Meng C.,Zhejiang University | Ding X.,Zhejiang University | Ding X.,Zhejiang California International Nano Systems Institute | Zhao J.,Zhejiang University | And 4 more authors.
Journal of the European Ceramic Society | Year: 2016

Rare-earth phosphates (REPO4) represent one candidate to contain minor actinides separated from used nuclear fuel. In this work, the Gd1-xYbxPO4 (0≤x≤ 1) series is synthesized via conventional solid-state reaction using Gd as the surrogate for trivalent actinides (Am, Cm), with microstructure/phase structure characterized by XRD, XPS, HRTEM and SEM as well. Solid solutions of monazite- and xenotime-type compounds are observed in the system. The structural boundary between two phases is based on the experimental temperature. The monazite→xenotime transformation is most likely to occur on a (200) monazite plane along the [020] zone. The pure xenotime-type crystalline phase with Gd0.9Yb0.1PO4 composition is obtained at 1600°C. © 2015 Elsevier Ltd.


Meng C.,Zhejiang University | Ding X.,Zhejiang University | Ding X.,Zhejiang California International Nano Systems Institute | Zhao J.,Zhejiang University | And 4 more authors.
Progress in Nuclear Energy | Year: 2016

Monazites are of considerable interest for immobilization of minor actinides. In this work, the Gd1-xCexPO4 (0 ≤ x ≤ 1) series is synthesized via conventional solid-state reaction using Ce as the surrogate for minor actinide americium (Am), with microstructure/phase structure characterized by XRD, HRTEM, μ-Raman, and SEM as well. The optimized temperature for preparation of monazite-type Gd0.4Ce0.6PO4 solid solution is more than 1300 °C. At 1400 °C, the GdPO4 ceramic is essentially monazite with little metastable xenotime phase. The metastable xenotime (GdPO4) to monazite transformation occurs during the immobilizing phase of Ce element. The formation of monazite-type Gd1-xCexPO4 solid solutions in the range 0.1 ≤ x ≤ 1 is confirmed by the Rietveld refinement and Raman spectra. The change of Ce content has no significant influence on the morphology of the monazite-type Gd1-xCexPO4 compounds. © 2016 Elsevier Ltd. All rights reserved.


Zhao J.,Zhejiang University | Ding X.,Zhejiang University | Ding X.,Zhejiang California International Nano Systems Institute | Meng C.,Zhejiang University | And 4 more authors.
Progress in Nuclear Energy | Year: 2015

The novel SiO2-ZrO2-calcium alginate aerogels were prepared by Sol-Gel process with phase separation method for investigating the adsorption and immobilization performance of the plutonium and minor actinides from high-level liquid waste (HLLW). The materials contained porous network structure with high surface area (233.44-481.08 m2/g) and pore volume (0.50-1.26 m3/g). The aerogels were superior adsorbents for the removal of plutonium and minor actinides, the maximum adsorption capacity and adsorption rate (35 °C, 75 rpm) reached 231.5 mg/g and 99.2%. For all the waste forms, SiO2, ZrO2 and Ca2SiO4 phases were simultaneously observed in the matrix. Moreover, Ce entered into Ca sites of Ca2SiO4 and Zr sites of ZrO2. The substitution of Ca and Zr by Ce in the Ca2SiO4 and ZrO2 implies a promising disposal measure of actinides. © 2015 Published by Elsevier Ltd.

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