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Cheng J.,Beijing Information Science and Technology University | Cheng J.,Beijing University of Posts and Telecommunications | Cheng J.,Key Laboratory for Modern Measurement and Control Technology | Cheng J.,Beijing Institute of Technology | And 12 more authors.
CrystEngComm | Year: 2010

Lead nitrate mixed with alkali in solution generates insoluble precipitates. The morphology and microstructure of the precipitates are dramatically influenced by the chloride anion concentration in the lead nitrate precursor solution. To intensively investigate the effect of the chloride anion concentration, we performed a series of controllable experiments with different concentrations of chloride anions (the concentration ratios of Pb 2+:Cl- = 1:0, 1:0.2, 1:0.5, 1:1, 1:2, and 1:3 in the solution) at different solution temperatures of 90 and 80 °C. The results reveal that, with the increasing concentration of chloride anions, the colour of the precipitates changes from yellow to red and finally to white; the morphology of the precipitates changes from plate-like to rod-like; the crystal structure of the precipitates changes from β-PbO to a mixture of β- and α-PbO (or α-PbO), and finally to lead hydroxide. These results suggest that adding chloride could lead to the formation of rod-like morphology and simultaneously could restrain the dehydration of Pb(OH)2. © The Royal Society of Chemistry 2010. Source


Cheng J.,Beijing University of Posts and Telecommunications | Cheng J.,Beijing Information Science and Technology University | Cheng J.,Key Laboratory for Modern Measurement and Control Technology | Zou X.-P.,Beijing Information Science and Technology University | And 11 more authors.
Chinese Physics Letters | Year: 2010

We present a simple method to synthesize Pb(OH)2 nanorods by solution-phase reaction. Rod-like lead hydroxide precipitates are obtained by mixing lead nitrate with a concentration of about 0.01 M and potassium hydroxide with concentration of about 0.03 M in an aqueous solution. Sodium chloride as an additive is premixed with the lead nitrate aqueous solution. The presence of chloride ions in the precursor solution results in the rod-like morphology of lead hydroxide precipitates. The growth mechanism of the lead hydroxide nanorods is discussed. © 2010 Chinese Physical Society and IOP Publishing Ltd. Source


Wang M.,Beijing Information Science and Technology University | Wang M.,Key Laboratory for Modern Measurement and Control Technology | Zou X.,Beijing Information Science and Technology University | Zou X.,Key Laboratory for Modern Measurement and Control Technology | And 10 more authors.
Journal of Computational and Theoretical Nanoscience | Year: 2010

It is important and interesting thing to recognize the atomic structure of graphite by processing graphite STM images, which is useful to automatically give the hexagonal topology structure duringin-situ STM scanning of graphite. In this paper, we report some digital image processing algorithm applications on the recognition of atomic structure of graphite. At last, we also write the software with c++ codes, which applying the digital image processing algorithms. And from the result of processing a typical STM image of graphite, we can clearly see graphite hexagon structure. Copyright © 2010 American Scientific Publishers I All rights reserved. Source

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