Experimental investigation of the band broadening originating from the top and bottom walls in micromachined nonporous pillar array columns

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Eghbali, Hamed and Malsche, Wim de and Smet, Jan de and Billen, Jeroen and Pra, Mauro de and Kok, Wim Th. and Schoenmakers, Peter J. and Gardeniers, Han and Desmet, Gert (2007) Experimental investigation of the band broadening originating from the top and bottom walls in micromachined nonporous pillar array columns. Journal of Separation Science, 30 (16). pp. 2605-2613. ISSN 1615-9306

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Abstract:We report on the experimental investigation of the effect of the top and bottom wall plates in micromachined nonporous pillar array columns. It has been found that their presence yields an additional c-term type of band broadening that can make up a significant fraction of the total band broadening (at least if considering nonporous pillars and a nonretained tracer). Their presence also induces a clear (downward) shift of the optimal velocity. These observations are, however in excellent quantitative agreement with the theoretical expectations obtained from a computational fluid dynamics study. The presently obtained experimental results, hence, demonstrate that the employed high aspect ratio Bosch etching process can be used to fabricate micromachined pillar arrays that are sufficiently refined to achieve the theoretical performance limit.

Item Type:Article
Copyright:© 2007 WILEY-VCH Verlag GmbH & Co. KGaA
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/74806
Official URL:http://dx.doi.org/10.1002/jssc.200700203
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Metis ID: 244783