Online‐Analysis on Acoustically Levitated Droplets
Online‐Analysis on Acoustically Levitated Droplets
复制标题
声学悬浮液滴的在线分析
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Stammer
中科院分区：
文献类型：
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作者：
Silke Biedasek;M. Abboud;H. Moritz;A. Stammer
在40 kHz声悬浮器中悬浮丙烯酸水溶液。通过与内标相关的拉曼光谱监测悬浮液滴中的单体量。因此，通过拉曼光谱研究单体的蒸发以及由氧化还原体系引发的聚合反应，并将所得数据与HPLC数据进行比较。由于蒸发导致的单体量的减少可以与聚合反应清楚地区分开。此外，在整个聚合反应中液滴内的温度测量显示了源自聚合热的典型温度过程。
Aqueous solutions of acrylic acid were levitated in a 40 kHz acoustic levitator. The monomer amount in the levitated droplets was monitored by Raman spectroscopy relating to an internal standard. Thus evaporation of the monomer as well as polymerization reactions initiated by a redox system were investigated by Raman spectroscopy and resultant data were compared to HPLC data. Decreases in monomer amount due to evaporation can be clearly distinguished from polymerization reactions. Additionally, temperature measurement within the droplet throughout a polymerization reaction shows the typical temperature course originating from the heat of polymerization.