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C. Wagner, G. Lindermuth, M. Kraft, M. Vellekoop, B. Lendl:
"Evaluation of a four-layer lamination micro mixer used for time resolved FTIR spectroscopy on the low ms time scale";
Poster: International Conference on Advanced Vibrational Spectrosopcy, ICVAS 5, Melbourne; 12.07.2009 - 17.07.2009.

Time resolved measurements are a hot topic in IR spectroscopy today. Two well established techniques, step scan and rapid scan measurements, suffer from the
same major drawback. For both techniques the (bio)chemical reaction under investigation needs to be triggered and additionally, the classical step scan experiment
can only be applied for cyclic reactions.
A very promising approach to overcome the triggering problem is to use micro mixers for time resolved measurements. The basic principle of this technique is to mix
two liquids through diffusion in a mixing channel that also serves as measurement area. The actual measurements take place at well defined spots along this channel, corresponding to specific reaction times: moving the measurement spot towards the entry yields shorter reaction times, moving it towards the channel's end gives longer reaction times. For time resolved FTIR measurements, utilising micro mixers, fast mixing times are crucial to ensure a well defined starting point of the (bio)chemical reaction. This is challenging to achieve in small dimensions, limited by the experimental parameters, due to the laminar flow regime present.

http://publik.tuwien.ac.at/files/PubDat_181340.pdf