Morphological modification of nanostructured ultrathin-layer chromatography stationary phases

Jim, Steven R.; Oko, A.J.; Taschuk, Michael T.; Brett, Michael

doi:10.1016/j.chroma.2011.08.024

Cited by 33 publications

(15 citation statements)

References 28 publications

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“…Efficiencies or numbers of theoretical plates were calculated from: (2) where W is the width of the analyte band. Observed plate heights and variances were calculated using an equation described by Poole and Poole [38]: (3) where Z o represents the distance between the solvent entry position and the position of the applied sample spot, and Z f represents the distance the solvent travels from its entry position.…”

Section: Image and Data Analysismentioning

confidence: 99%

“…Of late, various research groups have shown interest in developing TLC plates with new materials and fabrication techniques. These include monolithic silica [1], glancing angle deposition (GLAD) [2][3][4], polymer monoliths [5][6][7][8], and electrospun polymers [9,10]. Our group has also been active in this area, reporting TLC plates with high efficiencies and short run times prepared from microfabricated, patterned, and infiltrated carbon nanotube (CNT) forests [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Atomic layer deposition of aluminum-free silica onto patterned carbon nanotube forests in the preparation of microfabricated thin-layer chromatography plates

Kanyal¹,

Jensen²,

Dadson³

et al. 2014

Journal of Planar Chromatography – Modern TLC

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SummaryWe describe the direct, conformal, atomic layer deposition (ALD) of silica onto carbon nanotubes (CNTs) in the microfabrication of thinlayer chromatography (TLC) plates. As before, these plates were prepared with zig-zag hedge and channel microstructures, with high aspect ratio, porous hedges. After ALD, scanning electron microscopy (SEM) showed an increase in the radius of the CNTs of 8-40 nm. X-ray photoelectron spectroscopy (XPS) showed that the plates were composed almost entirely of silicon and oxygen, without contamination of metals or other elements that might compromise chromatographic performance, e.g., aluminum. Time-of-flight secondary ion mass spectrometry confirmed the extremely low level of aluminum in the plates. The final TLC layer thickness was ca. 50 μm. Separations of a test mixture of dyes from CAMAG (Muttenz, Switzerland) on an uncoated silica plate under traditional, normal phase conditions gave efficiencies of 40,000-140,000 plates m −1 with migration distances ranging from 2 to 36 mm. A separation of two fluorescent dyes, eosin Y disodium salt and sulforhodamine B, on an amino silane-coated plate gave efficiencies of ca. 170,000 and 200,000 plates m −1 , with hR F values of 76 and 88, respectively. Run times on these new plates were much faster than on conventional TLC plates.

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Section: Image and Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic layer deposition of aluminum-free silica onto patterned carbon nanotube forests in the preparation of microfabricated thin-layer chromatography plates

Kanyal¹,

Jensen²,

Dadson³

et al. 2014

Journal of Planar Chromatography – Modern TLC

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“…Functionalizing thin films by controlled porosity engineering is a very interesting route to achieve desired physical film properties for various applications such as chromatography or optical humidity and biochemical sensing [1][2][3] . Glancing angle deposition is an appropriate physical vapor deposition technique to fabricate nanostructured thin films with columnar characteristics and allows for tailoring especially optical properties by controlling nanostructure geometry and porosity 4 .…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Bruggeman effective medium approaches for slanted columnar thin films

Schmidt

Schubert

2013

Journal of Applied Physics

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Two different formalisms for the homogenization of composite materials containing ellipsoidal inclusions based on Bruggeman's original formula for spherical inclusions can be found in the literature. Both approximations determine the effective macroscopic permittivity of such an idealized composite assuming randomly distributed dielectric particles of equal shape and differ only in the definition of the depolarization factors. The two approaches are applied to analyze ellipsometric Mueller matrix spectra acquired in the visible and nearinfrared spectral region from metal and semiconductor slanted columnar thin films. Furthermore, the effective dielectric function tensor generated by the two Bruggeman formalisms is compared to effective major axes dielectric functions individually determined with a homogeneous biaxial layer approach. Best-match model parameters of all three model approaches are discussed and compared to estimates from scanning electron microscope images. The structural parameters obtained from all three optical modeling approaches agree well with the electron microscopy technique. A comparative discussion is given for the validity and applicability of the three model approaches for analysis of future devices structures that may require optical readout using generalized ellipsometry methods.

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“…Recently, several unconventional methods and materials have been used for nanostructured or binder-free ultrathin-layer chromatography (UTLC) plate manufacture. These include glancing angle deposition (GLAD) [1][2][3], monoliths [4][5][6][7][8][9][10], and electrospun polymers [11][12][13][14]. To this end, patterned, infiltrated, microfabricated carbon nanotube (CNT)-templated UTLC plates based on a zigzag geometry have also been introduced [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 98%

Microfabrication, separations, and detection by mass spectrometry on ultrathin-layer chromatography plates prepared via the low-pressure chemical vapor deposition of silicon nitride onto carbon nanotube templates

Kanyal

Häbe

Cushman

et al. 2015

Journal of Chromatography A

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Morphological modification of nanostructured ultrathin-layer chromatography stationary phases

Cited by 33 publications

References 28 publications

Atomic layer deposition of aluminum-free silica onto patterned carbon nanotube forests in the preparation of microfabricated thin-layer chromatography plates

Atomic layer deposition of aluminum-free silica onto patterned carbon nanotube forests in the preparation of microfabricated thin-layer chromatography plates

Anisotropic Bruggeman effective medium approaches for slanted columnar thin films

Microfabrication, separations, and detection by mass spectrometry on ultrathin-layer chromatography plates prepared via the low-pressure chemical vapor deposition of silicon nitride onto carbon nanotube templates

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