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zhzh0731金虫 (小有名气)
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QCM结果分析
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| 从Fig. 3b可知，注射DMMP后，前1560s石英晶片的振动频率降低至-103Hz，1560s-3560s石英晶体振动频率慢慢上升到-54HZ，之后石英晶体频率不再上升，反而一直缓慢下降，直至19616s振动频率下降到最小为-228HZ，这说明PC-QCM传感器对DMMP作用不仅仅只是物理吸附，同时复合膜还能对DMMP进行化学吸附。前1560s主要体现出P-80对DMMP的物理吸附性能，振动频率下降。1560s-3560s随着膜表面的DMMP溶度增大，装置中DMMP溶度的下降，复合膜对DMMP的吸附速率小于载气对DMMP的洗脱速率，此时已吸附一部分的DMMP慢慢被洗脱下来，振动频率回升。而第三阶段（3560s-19616s）复合膜对DMMP的化学吸附速率大于载气的洗脱速率，主要体现出复合膜对DMMP的反应性，频率再次慢慢下降，最后随着复合膜P-80与DMMP化学吸附位点减少，化学吸附速率慢慢下降直至速率为0，此时达到一个稳定的共振频率。说明P-80对DMMP既有好的物理吸附性能，也有一定的化学吸附能力。 |
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zuodg
铁杆木虫 (正式写手)
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sltmac(金币+1): 赞~~ 2011-06-11 20:23:23
zhzh0731(金币+80, 翻译EPI+1): 谢谢！继续等待QCM高手翻译 2011-06-12 21:36:01
sltmac(金币+50): 2011-06-16 12:06:48
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zhzh0731(金币+80, 翻译EPI+1): 谢谢！继续等待QCM高手翻译 2011-06-12 21:36:01
sltmac(金币+50): 2011-06-16 12:06:48
sltmac(金币+50): 2011-06-16 12:06:52
sltmac(金币+20): 欢迎常来~~ 2011-06-16 12:07:02
| As shown in Figure 3b, after injection of DMMP, vibration frequency before 1560 second decreases to -103Hz, then increase to 54HZ slowly from 1560second to 3560 second. Later that time, instead of increasing, vibration frequency keeps decreasing slowly to minimum value -228HZ at 19616 second. This indicates that effect of PC-QCM sensor on DMMP comprises not only physical adsorption but also chemical adsorption of DMMP by composite film. Before 1560 second, chemical adsorption of DMMP by P-80 coupled with decreasing of vibration frequency is dominant. From 1560 to 3560 second, with increase of DMPP solubility on the surface of film and decrease of DMPP solubility in the instrument, adsorption rate of composite film to DMPP is smaller than elution rate of carrier gas to DMPP. During this time, some of adsorption is gradually eluted and vibration frequency begins to recover. During the third period (3560s-19616s) chemical adsorption rate of composite film to DMPP is larger than elution rate of carrier gas. This period mainly reflects reactive of composite films to DMPP and gradual decrease of vibration frequency. In the end, with adsorption site of P-80 to DMPP, chemical adsorption rate gradually decrease to zero. At this last second, a stable resonance frequency is reached. Research indicates that P-80 display good performances to DMPP with both physical adsorption and chemical adsorption. |
2楼2011-06-11 19:05:42