New carbon nanotubes growth process in a closed microfabricated channel for liquid chromatography application

Fonverne, Agnès; Demesmay, Claire; Ricoul, F.; Rouvière, Emmanuelle; Dijon, Jean; Vinet, F.

doi:10.1016/j.sna.2011.02.042

Cited by 17 publications

(11 citation statements)

References 31 publications

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“…Since the group of Regnier first used perfectly ordered pillars as the stationary-phase support structure in chromatography in 1998 [2], pillar array columns (PACs) have been studied intensively by a limited number of research groups [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A dramatic reduction of the disorder related eddy dispersion or A-term of the van Deemter equation has been consistently demonstrated throughout the past decade, but also the freedom in external porosity, flow-through pore shape and channel depth turned out to be features that can be exploited to further tune and improve the column considerably.…”

Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of mesoporous silica layers on radially elongated pillars

Futagami

Hara

Ottevaere

et al. 2017

Journal of Chromatography A

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The present paper describes the application of a sol-gel procedure on radially elongated pillars (REPs) using tetramethoxysilane and methyltrimethoxysilane. After octadecylsilylation, the quality of the porous layered REP (PLREP) columns was evaluated by in-situ determination of migration velocities and band broadening of coumarin dyes with fluorescence microscopy in reversed-phase liquid chromatography. Based on the increase in retention due to the sol-gel process, an increase in accessible specific surface by a factor of 112 was observed. Argon physisorption measurements on bulk monoliths prepared with the same method revealed a predominant pore size of 91Å. Plate heights as low as 0.4-0.8μm (k=0-1.97) could be obtained thanks to the very low dispersion of the REP format and to the fact that the applied silica layer was conformally and uniformly deposited on the flow-through channels. A kinetic plot analysis demonstrated that the studied PLREP column will deliver more theoretical plates per unit of time than a 5μm core shell packed bed when more than 1.0×10 theoretical plates are required.

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Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of mesoporous silica layers on radially elongated pillars

Futagami

Hara

Ottevaere

et al. 2017

Journal of Chromatography A

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“…Pillars with a porous layer: (a) grown outwards (carbon nanotubes) (reprinted from Ref. with permission from Elsevier), (b) grown inwards (anodization) (reproduced from Ref. with permission from the Royal Society of Chemistry).…”

Section: Plug Flowmentioning

confidence: 99%

Chromatography as an inspiration for microreactors

Hereijgers

Breugelmans

Malsche

2015

J. Chem. Technol. Biotechnol.

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In the shift from batch to continuous operations, microreactors, at least in academic research, have become an important segment. One of the next steps in process intensification is believed to be the reduction of axial dispersion, which will not only yield higher efficiencies but also allow integration of the reactor unit with downstream processing. Chromatographic (micro)devices are very interesting in this context as they successfully combine a narrow residence time distribution with a high separation factor. In the present review the low dispersion in microreactors is discussed, with emphasis on throughput, packing and flow distribution units. Subsequently, the relevance and progress during the last decade of combined reaction and separations in chromatographic and membrane based systems is treated. © 2015 Society of Chemical Industry

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“…[1][2][3][4] Due to their outstanding mechanical, chemical and surface properties, carbon nanotubes (CNTs) have attracted interest for various ow systems like lters, 5 membranes, 6,7 or chromatography. 8,9 However, their implementation in ow catalysis [10][11][12] is more limited despite being intensively investigated as supports for various catalysts 13 including particles, 14,15 molecules 16 or enzymes, [17][18][19][20] and for various chemical reactions. The relatively limited use of CNTs in ow systems can be inferred to the challenging dispersion of CNTs 21 especially in aqueous solutions and the related complex processing.…”

Section: Introductionmentioning

confidence: 99%