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首页> 外文会议>US Combustion Meeting; 20070325-28; San Diego,CA(US) >Flame synthesis of molybdenum oxide hollow micro-channels
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Flame synthesis of molybdenum oxide hollow micro-channels

机译：火焰氧化钼空心微通道的合成

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The experimental studies on the synthesis of MoO_2 hollow micro-channels are performed using an opposed flow diffusion flame formed by methane/acetylene and oxygen enriched air streams. The morphology and growth rate variations are studied by introducing a molybdenum probe at a specified flame environment for varying deposition times. It is found that deposition time is an important synthesis parameter controlling the size and morphology of the crystalline whiskers. Micro-channels and needle-like structures are observed when the Mo probe is inserted at the flame height of 12.0 mm for a period of time less than a minute. An average channel width and length of ～ 0.9 and 9.2 μm was measured, respectively. Increasing the deposition time up to 3 minutes, while exposing the probe to identical flame temperature and chemical conditions, results in the formation of channel-like structures with increased thicknesses and lengths. The channel width and length increases to an average value of ～3.2 and 18 μm, respectively. Furthermore, the exposure of the probe for a time period of 4.5 minutes for the same flame height resulted in the formation of very long channels with very thick walls, with average channel width and length of ～ 8.5 and 40.2 μm, respectively. For the deposition times from 1 to 4.5 minutes, the channels are completely hollow and contain very large cavities that are free of other materials. The formation of dendrites is observed for deposition times exceeding five minutes.
机译：MoO_2中空微通道合成的实验研究是使用由甲烷/乙炔和富氧空气流形成的对流扩散火焰进行的。通过在指定的火焰环境下引入钼探针以改变沉积时间，可以研究形态和生长速率的变化。发现沉积时间是控制晶须的大小和形态的重要合成参数。当将Mo探针以12.0 mm的火焰高度插入不到一分钟的时间时，会观察到微通道和针状结构。测量的平均通道宽度和长度分别为〜0.9和9.2μm。将探针暴露于相同的火焰温度和化学条件下，将沉积时间延长至3分钟，会导致形成通道状结构，并增加厚度和长度。通道宽度和长度分别增加到〜3.2和18μm的平均值。此外，在相同的火焰高度下，探针暴露4.5分钟的时间导致形成了非常长的通道，其壁非常厚，平均通道宽度和长度分别约为8.5和40.2μm。对于1到4.5分钟的沉积时间，通道完全是中空的，并且包含非常大的空腔，没有其他材料。在超过五分钟的沉积时间内观察到树枝状晶体的形成。

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