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- Author or Editor: Hong-Wen Wang x
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Abstract
Raw chemicals such as metal nitrates and chlorides were found to affect the thermal decomposition behaviour of EDTA-gel precursors used for the production of ceramic powders. Fine, homogeneous ceramic powders were produced from nitrate solutions while chlorides gave segregated phases. In studies on the production of lead zirconate titanate (PZT) using chlorides, the segregation and loss of lead was observed and shown to be caused by the formation and evaporation of PbCl2. Thermal analysis (DTA/TG) quantitatively proved the suggested reaction mechanism for this phase segregation. Crystallization of the desired perovskite phase of lead zirconate titanate (PZT) and barium titanate (BT) initiated at temperatures as low as 250°C in the nitrate-EDTA precursors. Water of crystallization and formation of BaCO3 in the barium titanate precursor were suggested to account for differences in the observed decompositional behaviours of the BT and PZT precursors.
Abstract
A new nitrido-188Re complex, 188ReN-NEMPTDD, was synthesized through a modified method in high yield. This complex was stable in vitro. The biodistribution in normal mice showed that this ReN complex accumulated in the liver and was eliminated quickly from almost all organs. VX2 carcinoma was grown in the livers of rabbits. Transcatheter arterial embolization (TAE) was performed using 188ReN-NEMPTDD/lipiodol solution. The SPECT images showed that the lipiodol solution could be concentrated in the tumor for about 12 hours. These results indicated that 188ReN-NEMPTDD/lipiodol could be a potential radiopharmaceutical for liver cancer.
Abstract
The partitioning of actinides from simulated high level liquid waste (HLLW) originated from the Purex process has been studied using a mixture of dihexyl N,N-diethylcarbamoylmethyl-phosphonate (DHDECMP) and tributylphosphonate (TBP) in kerosene (OK). The distribution ratios of actinides were investigated as a function of a number of parameters such as the concentration of nitric acid, salting-out reagent, Gd(III) in the aqueous phase, extractant in the organic phase, and temperature. The extraction complexes, extraction reaction constant k, and thermodynamic parameters 
H, G and S were determined. The extraction of actinides from simulated HLLW by DHDECMP-TBP/OK has been carried out using a miniature countercurrent centrifugal contactor. The results show that the removal efficiency of actinides is greater than 99.9%. A conceptual flowsheet for the removal of actinides from HLLW is proposed.
