MicroChannel Adsorption for Component Collection

In addition to electrophoresis-based collection of DNA in microchannels (see Section 7.7.3), adsorbents have been used to collect and purify DNA. In these cases, microchannels are generally used because of the small quantity of material requiring collection. Using solid phase extraction, sorbent particles of nano- and micro-silica and micro-sized octadecylsilica were immobilized using sol-gel chemistry to hU the microchannels of the microfluidic device [194]. DNA as well as several organic compoimds were evaluated for adsorption and desorption. They showed excellent adsorption, but poor recovery because they were difficult to extract. 

A single-channel TSA system was developed for NASA COj collection and compression from the Martian atmosphere [196]. Accordingly, there was a need for a lightweight, highly efficient compressor. Based on the results of single- 

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