Analyte migration in anisotropic nanostructured ultrathin-layer chromatography media

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

doi:10.1016/j.chroma.2010.12.021

Cited by 32 publications

(16 citation statements)

References 25 publications

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“…That is, Z sol = Z f − Z o , and Eq. (3) reduces to: (4) However, for R F , as defined above, Eq. (4) becomes:…”

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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“…That is, Z sol = Z f − Z o , and Eq. (3) reduces to: (4) However, for R F , as defined above, Eq. (4) becomes:…”

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

View full text Add to dashboard Cite

show abstract

“…The same general approach was used to analyze polyaromatic hydrocarbons in cooking oils, giving a chip‐based technique that could be used for both sample cleanup and analysis . In addition, gold nanoparticles have been placed onto aminopropyl silica by Amoli‐Diva and Pourghazi for use in planar chromatography and the separation of steroids in human urine .…”

Section: Nanomaterials In Planar Liquid Chromatographymentioning

confidence: 99%

Nanomaterials as stationary phases and supports in liquid chromatography

et al. 2017

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The development of various nanomaterials over the last few decades has led to many applications for these materials in liquid chromatography (LC). This review will look at the types of nanomaterials that have been incorporated into LC systems and the applications that have been explored for such systems. A number of carbon-based nanomaterials and inorganic nanomaterials have been considered for use in LC, ranging from carbon nanotubes, fullerenes and nanodiamonds to metal nanoparticles and nanostructures based on silica, alumina, zirconia and titanium dioxide. Many ways have been described for incorporating these nanomaterials into LC systems. These methods have included covalent immobilization, adsorption, entrapment, and the synthesis or direct development of nanomaterials as part of a chromatographic support. Nanomaterials have been used in many types of LC. These applications have included the reversed-phase, normal-phase, ion-exchange, and affinity modes of LC, as well as related methods such as chiral separations, ion-pair chromatography and hydrophilic interaction liquid chromatography. Both small and large analytes (e.g., dyes, drugs, amino acids, peptides and proteins) have been used to evaluate possible applications for these nanomaterial-based methods. The use of nanomaterials in columns, capillaries and planar chromatography has been considered as part of these efforts. Potential advantages of nanomaterials in these applications have included their good chemical and physical stabilities, the variety of interactions many nanomaterials can have with analytes, and their unique retention properties in some separation formats.

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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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Analyte migration in anisotropic nanostructured ultrathin-layer chromatography media

Cited by 32 publications

References 25 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

Nanomaterials as stationary phases and supports in liquid chromatography

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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