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Ghosh R, Chen G, Umatheva U, Gatt P. A flow distribution and collection feature for ensuring scalable uniform flow in a chromatography device. J Chromatogr A 2020; 1618:460892. [DOI: 10.1016/j.chroma.2020.460892] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/28/2019] [Accepted: 01/14/2020] [Indexed: 01/05/2023]
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Gilar M, McDonald TS, Gritti F, Roman GT, Johnson JS, Bunner B, Michienzi JD, Collamati RA, Murphy JP, Satpute DD, Bannon MP, DellaRovere D, Jencks RA, Dourdeville TA, Fadgen KE, Gerhardt GC. Chromatographic performance of microfluidic liquid chromatography devices: Experimental evaluation of straight versus serpentine packed channels. J Chromatogr A 2017; 1533:127-135. [PMID: 29249537 DOI: 10.1016/j.chroma.2017.12.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 12/06/2017] [Accepted: 12/12/2017] [Indexed: 10/18/2022]
Abstract
We prepared a series of planar titanium microfluidic (μLC) columns, each 100 mm long, with 0.15, 0.3 and 0.5 mm i.d.'s. The microfluidic columns were packed with 1.8 μm C18 sorbent and tested under isocratic and gradient conditions. The efficiency and peak capacity of these devices were monitored using a micro LC instrument with minimal extra column dispersion. Columns with serpentine channels were shown to perform worse than those with straight channels. The loss of efficiency and peak capacity was more prominent for wider i.d. columns, presumably due to on-column band broadening imparted by the so-called "race-track" effect. The loss of chromatographic performance was partially mitigated by tapering the turns (reduction in i.d. through the curved region). While good performance was obtained for 0.15 mm i.d. devices even without turn tapering, the performance of 0.3 mm i.d. columns could be brought on par with capillary LC devices by tapering down to 2/3 of the nominal channel width in the turn regions. The loss of performance was not fully compensated for in 0.5 mm devices even when tapering was employed; 30% loss in efficiency and 10% loss in peak capacity was observed. The experimental data for various devices were compared using the expected theoretical relationship between peak capacity Pc and efficiency N; (Pc-1) = N0.5 × const. While straight μLC columns showed the expected behavior, the devices with serpentine channels did not adhere to the plot. The results suggest that the loss of efficiency due to the turns is more pronounced than the corresponding loss of peak capacity.
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Affiliation(s)
- Martin Gilar
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA.
| | | | - Fabrice Gritti
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | | | - Jay S Johnson
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | - Bernard Bunner
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | | | | | - Jim P Murphy
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
| | | | | | | | | | | | - Keith E Fadgen
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
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Khirevich S, Höltzel A, Seidel-Morgenstern A, Tallarek U. Geometrical and topological measures for hydrodynamic dispersion in confined sphere packings at low column-to-particle diameter ratios. J Chromatogr A 2012; 1262:77-91. [PMID: 23000179 DOI: 10.1016/j.chroma.2012.08.086] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 08/28/2012] [Accepted: 08/29/2012] [Indexed: 10/27/2022]
Abstract
At low column-to-particle diameter (or aspect) ratio (d(c)/d(p)) the kinetic column performance is dominated by the transcolumn disorder that arises from the morphological gradient between the more homogeneous, looser packed wall region and the random, dense core. For a systematic analysis of this morphology-dispersion relation we computer-generated a set of confined sphere packings varying three parameters: aspect ratio (d(c)/d(p)=10-30), bed porosity (ɛ=0.40-0.46), and packing homogeneity. Plate height curves were received from simulation of hydrodynamic dispersion in the packings over a wide range of reduced velocities (v=0.5-500). Geometrical measures derived from radial porosity and velocity profiles were insufficient as morphological descriptors of the plate height data. After Voronoi tessellation of the packings, topological information was obtained from the statistical moments of the free Voronoi volume (V(free)) distributions. The radial profile of the standard deviation of the V(free) distributions in the form of an integral measure was identified as a quantitative scalar measure for the transcolumn disorder. The first morphology-dispersion correlation for confined sphere packings deepens our understanding of how the packing microstructure determines the kinetic column performance.
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Affiliation(s)
- Siarhei Khirevich
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
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Daneyko A, Hlushkou D, Khirevich S, Tallarek U. From random sphere packings to regular pillar arrays: Analysis of transverse dispersion. J Chromatogr A 2012; 1257:98-115. [DOI: 10.1016/j.chroma.2012.08.024] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 08/02/2012] [Accepted: 08/05/2012] [Indexed: 11/26/2022]
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Daneyko A, Khirevich S, Höltzel A, Seidel-Morgenstern A, Tallarek U. From random sphere packings to regular pillar arrays: Effect of the macroscopic confinement on hydrodynamic dispersion. J Chromatogr A 2011; 1218:8231-48. [DOI: 10.1016/j.chroma.2011.09.039] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Revised: 09/06/2011] [Accepted: 09/13/2011] [Indexed: 11/16/2022]
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Daneyko A, Höltzel A, Khirevich S, Tallarek U. Influence of the Particle Size Distribution on Hydraulic Permeability and Eddy Dispersion in Bulk Packings. Anal Chem 2011; 83:3903-10. [DOI: 10.1021/ac200424p] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anton Daneyko
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
| | - Alexandra Höltzel
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
| | - Siarhei Khirevich
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
| | - Ulrich Tallarek
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35032 Marburg, Germany
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