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【答案】应助回帖
wuyao118(金币+60, 翻译EPI+1): 好 谢谢！ 2011-07-06 09:03:01
wuyao118(金币+60): 2011-07-16 14:57:39
1 As-prepared microspheres with fluctuation in size and irregularity in shape.
2 The time for the orientated growth of PbS nanosheets generated from nanocrystalline is enough. However, the PbS hollow sub-microsphere couldn’t be well formed because of the small in quantity but to form large size of PbS nanosheet
3 Many agglomerated particles from the rupture of microspheres are prepared when the reaction time prolonging to 36h and few microspheres with fluctuation in size and irregularity in shape. The nanosheet composed with microspheres also shows the irregularity in shape, lower aspect ratio, and there is a tendency for microspheres transforming into nanoparticles. Therefore, the nanoparticles are obtained due to the vanish of bridging action of nanosheets in microspheres, the reason is the large surface area and high specific surface free energy of nanosheets, so it is non-stable in thermodynamics. With the increase in reaction time, it will generate to nanoparticles and glomerate together to reduce its surface free energy sustain stable situation. |
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