| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Comparative Study of Activity of Different Agings of Aluminum Nanopowders |
| YAN Zheng-Xin1,2, DENG Jun1, WANF Ya-Min2, LIU Wei2 |
| 1Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi'an University of Science and Technology, Xi'an 7100542College of Science, Xi'an University of Science and Technology, Xi'an 710054 |
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| Cite this article: |
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YAN Zheng-Xin, DENG Jun, WANF Ya-Min et al 2009 Chin. Phys. Lett. 26 086101 |
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Abstract The structure and activity of aluminum nanopowders with a 3nm oxide layer on their surface (3-nm-OLA) and 30nm oxide layers on their surface (30-nm-OLA) are investigated comparably under the same normal incident shock wave intensity. Their corresponding reaction products are characterized by x-ray diffraction, high-resolution transmission electron microscopy and x-ray photoelectron spectroscopy. The spectrum of x-ray diffraction shows that there are different phases of alumina in their products, which evidences directly the different reacting temperature in the shock tube. The x-ray photoelectron spectroscopy reveals that the oxide layer thickness is 30nm on the product surface of 30-nm-OLA, while it is only 3nm on 3-nm-OLA. Images of transmission electron microscopy present additional evidence that the agglomeration mechanism is over sintering one in the containing-30-nm-OLA system, the reversed mechanism is observed in the containing-3-nm-OLA
reaction system.
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| Keywords:
61.46.-w
81.40.Vw
34.80.Dp
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Received: 09 March 2009
Published: 30 July 2009
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| PACS: |
61.46.-w
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(Structure of nanoscale materials)
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81.40.Vw
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(Pressure treatment)
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34.80.Dp
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(Atomic excitation and ionization)
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