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wuyao118金虫 (小有名气)
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[求助]
无机材料化学专业：请教高手翻译几句话，不胜感激！
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1 微米球大小不均匀、形状不规则 2 PbS纳米晶有足够的时间定向生长为尺寸较大的纳米片，但纳米片的数量少。 导致不能很好地形成PbS空心微米球，而形成尺寸较大的PbS纳米片 3 当反应时间太长(36 h)时，生成了许多由微米球破裂生成的团聚颗粒，只有少数形状不规则、大小不均一的微米球，且组成微米球的纳米片形状很不规则，长径比降低、有逐渐转变为纳米颗粒的倾向。致使空心微米球由于失去了纳米片的架桥作用而破裂成颗粒，这是因为一方面，构成空心微米球的纳米片比表面积大、比表面自由能高，因而在热力学上是不稳定的，随着反应时间的延长，会转变为颗粒并团聚，以降低其表面自由能，达到稳定状态； [ Last edited by wuyao118 on 2011-7-5 at 16:21 ] |
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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
wuyao118(金币+60): 2011-07-16 14:57:39
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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. |
2楼2011-07-06 08:46:42