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Kraai JA, Rorrer GL, Wang AX. Highly-porous diatom biosilica stationary phase for thin-layer chromatography. J Chromatogr A 2019; 1591:162-170. [DOI: 10.1016/j.chroma.2019.01.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 01/10/2019] [Accepted: 01/12/2019] [Indexed: 11/16/2022]
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2
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Chumpol J, Siri S. Electrospun cellulose acetate membrane for size separating and antibacterial screening of crude polysaccharides. IET Nanobiotechnol 2018; 10:405-410. [PMID: 27906142 DOI: 10.1049/iet-nbt.2015.0120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
This study aims to produce electrospun cellulose acetate (CA) membrane as the alternative supporting medium for a separation of crude polysaccharides by electrophoresis and a screening of their antibacterial activity. Among the tested conditions of fabrication, electrospun CA membrane at 57% porosity showed the best separation of each polysaccharide from the standard mixture and the crude extract of Aloe vera via electrophoresis. As compared with the commercial CA membrane, the produced electrospun CA membrane demonstrated more separated spots of polysaccharides. The antibacterial activity of the electrophoretic polysaccharide was also determined against Escherichia coli and Staphylococcus aureus as the inhibition zone after the bacterial culture agar was overlaid on the membrane and incubated for 24 h. The results of this study suggested the potential application of electrospun CA membrane combining with electrophoresis as a simple method for separating crude polysaccharides and screening for their antibacterial activity.
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Affiliation(s)
- Jiraporn Chumpol
- Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand
| | - Sineenat Siri
- School of Biology, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand.
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3
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Beeram SR, Rodriguez E, Doddavenkatanna S, Li Z, Pekarek A, Peev D, Goerl K, Trovato G, Hofmann T, Hage DS. Nanomaterials as stationary phases and supports in liquid chromatography. Electrophoresis 2017; 38:2498-2512. [DOI: 10.1002/elps.201700168] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 07/12/2017] [Accepted: 07/17/2017] [Indexed: 12/16/2022]
Affiliation(s)
| | | | | | - Zhao Li
- Department of Chemistry University of Nebraska Lincoln NE USA
| | - Allegra Pekarek
- Department of Chemistry University of Nebraska Lincoln NE USA
| | - Darin Peev
- Department of Electrical Engineering University of Nebraska Lincoln NE USA
| | - Kathryn Goerl
- Department of Chemistry University of Nebraska Lincoln NE USA
| | - Gianfranco Trovato
- Department of Electrical Engineering University of Nebraska Lincoln NE USA
| | - Tino Hofmann
- Department of Electrical Engineering University of Nebraska Lincoln NE USA
| | - David S. Hage
- Department of Chemistry University of Nebraska Lincoln NE USA
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4
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Fichou D, Morlock GE. Open-Source-Based 3D Printing of Thin Silica Gel Layers in Planar Chromatography. Anal Chem 2017; 89:2116-2122. [PMID: 28208299 DOI: 10.1021/acs.analchem.6b04813] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
On the basis of open-source packages, 3D printing of thin silica gel layers is demonstrated as proof-of-principle for use in planar chromatography. A slurry doser was designed to replace the plastic extruder of an open-source Prusa i3 printer. The optimal parameters for 3D printing of layers were studied, and the planar chromatographic separations on these printed layers were successfully demonstrated with a mixture of dyes. The layer printing process was fast. For printing a 0.2 mm layer on a 10 cm × 10 cm format, it took less than 5 min. It was affordable, i.e., the running costs for producing such a plate were less than 0.25 Euro and the investment costs for the modified hardware were 630 Euro. This approach demonstrated not only the potential of the 3D printing environment in planar chromatography but also opened new avenues and new perspectives for tailor-made plates, not only with regard to layer materials and their combinations (gradient plates) but also with regard to different layer shapes and patterns. As such an example, separations on a printed plane layer were compared with those obtained from a printed channeled layer. For the latter, 40 channels were printed in parallel on a 10 cm × 10 cm format for the separation of 40 samples. For producing such a channeled plate, the running costs were below 0.04 Euro and the printing process took only 2 min. All modifications of the device and software were released open-source to encourage reuse and improvements and to stimulate the users to contribute to this technology. By this proof-of-principle, another asset was demonstrated to be integrated into the Office Chromatography concept, in which all relevant steps for online miniaturized planar chromatography are performed by a single device.
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Affiliation(s)
- Dimitri Fichou
- Chair of Food Sciences, Institute of Nutritional Science, and Interdisciplinary Research Center (IFZ), Justus Liebig University Giessen , Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany
| | - Gertrud E Morlock
- Chair of Food Sciences, Institute of Nutritional Science, and Interdisciplinary Research Center (IFZ), Justus Liebig University Giessen , Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany
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5
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Peev D, Hofmann T, Kananizadeh N, Beeram S, Rodriguez E, Wimer S, Rodenhausen KB, Herzinger CM, Kasputis T, Pfaunmiller E, Nguyen A, Korlacki R, Pannier A, Li Y, Schubert E, Hage D, Schubert M. Anisotropic contrast optical microscope. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:113701. [PMID: 27910407 DOI: 10.1063/1.4965878] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An optical microscope is described that reveals contrast in the Mueller matrix images of a thin, transparent, or semi-transparent specimen located within an anisotropic object plane (anisotropic filter). The specimen changes the anisotropy of the filter and thereby produces contrast within the Mueller matrix images. Here we use an anisotropic filter composed of a semi-transparent, nanostructured thin film with sub-wavelength thickness placed within the object plane. The sample is illuminated as in common optical microscopy but the light is modulated in its polarization using combinations of linear polarizers and phase plate (compensator) to control and analyze the state of polarization. Direct generalized ellipsometry data analysis approaches permit extraction of fundamental Mueller matrix object plane images dispensing with the need of Fourier expansion methods. Generalized ellipsometry model approaches are used for quantitative image analyses. These images are obtained from sets of multiple images obtained under various polarizer, analyzer, and compensator settings. Up to 16 independent Mueller matrix images can be obtained, while our current setup is limited to 11 images normalized by the unpolarized intensity. We demonstrate the anisotropic contrast optical microscope by measuring lithographically defined micro-patterned anisotropic filters, and we quantify the adsorption of an organic self-assembled monolayer film onto the anisotropic filter. Comparison with an isotropic glass slide demonstrates the image enhancement obtained by our method over microscopy without the use of an anisotropic filter. In our current instrument, we estimate the limit of detection for organic volumetric mass within the object plane of ≈49 fg within ≈7 × 7 μm2 object surface area. Compared to a quartz crystal microbalance with dissipation instrumentation, where contemporary limits require a total load of ≈500 pg for detection, the instrumentation demonstrated here improves sensitivity to a total mass required for detection by 4 orders of magnitude. We detail the design and operation principles of the anisotropic contrast optical microscope, and we present further applications to the detection of nanoparticles, to novel approaches for imaging chromatography and to new contrast modalities for observations on living cells.
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Affiliation(s)
- D Peev
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - T Hofmann
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - N Kananizadeh
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - S Beeram
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - E Rodriguez
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - S Wimer
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | | | - C M Herzinger
- J. A. Woollam Co., Inc., Lincoln, Nebraska 68508-2243, USA
| | - T Kasputis
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
| | | | - A Nguyen
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - R Korlacki
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - A Pannier
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - Y Li
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - E Schubert
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - D Hage
- Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - M Schubert
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
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6
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Häbe TT, Morlock GE. Miniaturization of Instrumental Planar Chromatography with Focus on Mass Spectrometry. Chromatographia 2016. [DOI: 10.1007/s10337-016-3113-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Moheman A, Alam MS, Mohammad A. Recent trends in electrospinning of polymer nanofibers and their applications in ultra thin layer chromatography. Adv Colloid Interface Sci 2016; 229:1-24. [PMID: 26792019 DOI: 10.1016/j.cis.2015.12.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 12/05/2015] [Accepted: 12/06/2015] [Indexed: 02/02/2023]
Abstract
Fabrication of polymer derived electrospun nanofibers by electrospinning as chromatographic sorbent bed for ultra-thin layer chromatography (UTLC) is a very demanding topic in analytical chemistry. This review presents an overview of recent development in the fabrication of polymer derived electrospun nanofibers and their applications to design UTLC plates as stationary phases for on-plate identification and separation of analytes from their mixture solutions. It has been reported that electrospun fiber based stationary phases in UTLC have enhanced separation efficiency to provide separation of analyte mixture in a shorter development time than those of traditional particle-based TLC stationary phases. In addition, electrospun UTLC is cost effective and can be modified for obtaining different surface selectivities by changing the polymer materials to electrospun devices. Electrospun UTLC plates are not available commercially till date and efforts are being rendered for their commercialization. The morphology and diameter of electrospun nanofibers are highly dependent on several parameters such as type of polymer, polymer molecular weight, solvent, viscosity, conductivity, surface tension, applied voltage, collector distance and flow rate of the polymer solution during electrospinning process. Among the aforementioned parameters, solution viscosity is an important parameter which is mainly influenced by polymer concentration. This review provides evidence for the fabrication of UTLC plates containing electrospun polymer nanofibers. Furthermore, the future prospects related to electrospinning and its application in obtaining of different types of electrospun nanofibers are discussed. The present communication is aimed to review the work which appeared during 2009-2014 on the application of polymer derived electrospun nanofibers in ultra thin layer chromatography.
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Affiliation(s)
- Abdul Moheman
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi 110062, India
| | - Mohammad Sarwar Alam
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi 110062, India.
| | - Ali Mohammad
- Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India
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8
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Moheman A, Alam MS, Gupta A, Dhakate SR, Kumar A, Mohammad A. Fabrication of nanofiber stationary phases from chopped polyacrylonitrile co-polymer microfibers for use in ultrathin layer chromatography of amino acids. RSC Adv 2016. [DOI: 10.1039/c6ra15465d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Polyacrylonitrile co-polymer microfibers of diameter 12.5 μm was used for electrospinning to produce nanofibers and then used as a stationary phase in UTLC for on-plate identification and separation of amino acid from drug sample.
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Affiliation(s)
- A. Moheman
- Department of Chemistry
- Faculty of Science
- Jamia Hamdard
- New Delhi 110062
- India
| | - M. Sarwar Alam
- Department of Chemistry
- Faculty of Science
- Jamia Hamdard
- New Delhi 110062
- India
| | - A. Gupta
- Physics and Engineering of Carbon
- Division of Materials Physics and Engineering
- National Physical Laboratory (CSIR)
- New Delhi 110012
- India
| | - S. R. Dhakate
- Physics and Engineering of Carbon
- Division of Materials Physics and Engineering
- National Physical Laboratory (CSIR)
- New Delhi 110012
- India
| | - A. Kumar
- Department of Chemistry
- Faculty of Science
- Jamia Hamdard
- New Delhi 110062
- India
| | - A. Mohammad
- Department of Applied Chemistry
- Faculty of Engineering and Technology
- Aligarh Muslim University
- Aligarh 202002
- India
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9
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Häbe TT, Morlock GE. Office Chromatography: Precise printing of sample solutions on miniaturized thin-layer phases and utilization for scanning Direct Analysis in Real Time mass spectrometry. J Chromatogr A 2015; 1413:127-34. [DOI: 10.1016/j.chroma.2015.08.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 07/31/2015] [Accepted: 08/03/2015] [Indexed: 10/23/2022]
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10
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Kanyal SS, Häbe TT, Cushman CV, Dhunna M, Roychowdhury T, Farnsworth PB, Morlock GE, Linford MR. 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. J Chromatogr A 2015; 1404:115-23. [DOI: 10.1016/j.chroma.2015.05.053] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 05/21/2015] [Accepted: 05/21/2015] [Indexed: 11/26/2022]
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11
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Morlock GE. Miniaturized planar chromatography using office peripherals--office chromatography. J Chromatogr A 2014; 1382:87-96. [PMID: 25442326 DOI: 10.1016/j.chroma.2014.09.050] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 09/18/2014] [Accepted: 09/19/2014] [Indexed: 11/26/2022]
Abstract
Office chromatography (OC) harnesses the novel combination of miniaturized planar separation science and modern print & media technologies. Interdisciplinary knowledge is the essence: Printing of solutions on powerful miniaturized planar separation materials in combination with image capturing and evaluation tools enables an innovative analytical online system. Site-specific printing as lines or areas on defined sections of the layer comprises important steps like application of samples, feeding of the mobile phase as well as supply of the derivatization reagent. Also printing of bioassays can be combined for effect-directed detections and the homogeneous printing of the ultrathin layer itself, enabling tailor-made gradient-layer or multi-layer plates. OC exploits image-giving miniaturized chromatograms being captured and processed with a flatbed scanner or mini-camera. Thus, miniaturized separation materials are the core of OC. Monolithic, electrospun, nanostructured glancing angle deposition and carbon nanotube-templated microfabricated layers or even pillar arrays or polymer brush coated sub-μm silica particles were demonstrated, showing promising results. Layer thicknesses from 50 μm down to few micrometers were explored. A high-throughput capacity is given through the parallel development of as many as possible tiny-printed samples on the separation material. The migration time was reduced to a few minutes and the calculated analysis time per sample lasted few seconds. Considering a substantially reduced solvent consumption at short run times for parallel analysis of numerous samples at the same time, OC is an appropriate analytical technique for green chemistry. OC facilitates the whole planar separation process to be performed with no other equipment but a combined device of printer and flatbed scanner or mini-camera. At the same time, OC can be expected to become a widespread and economical technique with the user-friendliness of high-end office tools, appealing to users.
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Affiliation(s)
- Gertrud E Morlock
- Food Science, Justus Liebig University Giessen, Interdisciplinary Research Centre (IFZ) and Institute of Nutritional Science, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany.
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12
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Newsome TE, Olesik SV. Silica-based nanofibers for electrospun ultra-thin layer chromatography. J Chromatogr A 2014; 1364:261-70. [DOI: 10.1016/j.chroma.2014.08.065] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 08/19/2014] [Accepted: 08/21/2014] [Indexed: 11/26/2022]
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13
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Kanyal S, Jensen D, Dadson A, Vanfleet R, Davis R, Linford M. Atomic layer deposition of aluminum-free silica onto patterned carbon nanotube forests in the preparation of microfabricated thin-layer chromatography plates. JPC-J PLANAR CHROMAT 2014. [DOI: 10.1556/jpc.27.2014.3.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Nováková Z, Oriňáková R, Oriňák A, Škantárová L, Hubálek J, Lofaj F. Electrochemical synthesis and functionality evaluation of silver nanostructured layers. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zuzana Nováková
- Department of Physical and Theoretical Chemistry, Faculty of Science; Comenius University; Mlynska Dolina SK-84215 Bratislava 4 Slovak Republic
| | - Renáta Oriňáková
- Department of Physical Chemistry, Faculty of Science; P.J. Šafárik University; Moyzesova 11 SK-04154 Košice Slovak Republic
| | - Andrej Oriňák
- Department of Physical Chemistry, Faculty of Science; P.J. Šafárik University; Moyzesova 11 SK-04154 Košice Slovak Republic
| | - Lenka Škantárová
- Department of Physical Chemistry, Faculty of Science; P.J. Šafárik University; Moyzesova 11 SK-04154 Košice Slovak Republic
| | - Jaromír Hubálek
- Center SIX, Faculty of Electrical Engineering and Communication; Brno University of Technology; Technicka 12 CZ-61600 Brno Czech Republic
| | - Frantisek Lofaj
- Institute of Materials Research; Slovak Academy of Sciences; Watsonova 47 SK-04353 Košice Slovak Republic
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15
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Rodenhausen KB, Schmidt D, Rice C, Hofmann T, Schubert E, Schubert M. Detection of Organic Attachment onto Highly Ordered Three-Dimensional Nanostructure Thin Films by Generalized Ellipsometry and Quartz Crystal Microbalance with Dissipation Techniques. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/978-3-642-40128-2_7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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Wannenmacher J, Jim SR, Taschuk MT, Brett MJ, Morlock GE. Ultrathin-layer chromatography on SiO2, Al2O3, TiO2, and ZrO2 nanostructured thin films. J Chromatogr A 2013; 1318:234-43. [DOI: 10.1016/j.chroma.2013.09.083] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Kirchert S, Wang Z, Taschuk MT, Jim SR, Brett MJ, Morlock GE. Inkjet application, chromatography, and mass spectrometry of sugars on nanostructured thin films. Anal Bioanal Chem 2013; 405:7195-203. [DOI: 10.1007/s00216-013-7131-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 05/30/2013] [Accepted: 06/07/2013] [Indexed: 11/28/2022]
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Jim SR, Foroughi-Abari A, Krause KM, Li P, Kupsta M, Taschuk MT, Cadien KC, Brett MJ. Ultrathin-layer chromatography nanostructures modified by atomic layer deposition. J Chromatogr A 2013; 1299:118-25. [PMID: 23768654 DOI: 10.1016/j.chroma.2013.05.050] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 05/17/2013] [Accepted: 05/21/2013] [Indexed: 10/26/2022]
Abstract
Stationary phase morphology and surface chemistry dictate the properties of ultrathin-layer chromatography (UTLC) media and interactions with analytes in sample mixtures. In this paper, we combined two powerful thin film deposition techniques to create composite chromatography nanomaterials. Glancing angle deposition (GLAD) produces high surface area columnar microstructures with aligned macropores well-suited for UTLC. Atomic layer deposition (ALD) enables precise fabrication of conformal, nanometer-scale coatings that can tune surfaces of these UTLC films. We coated ∼5μm thick GLAD SiO2 UTLC media with <10nm thick ALD metal oxides (Al2O3, ZrO2, and ZnO) to decouple surface chemistry from the underlying GLAD scaffold microstructure. The effects of ALD coatings on GLAD UTLC media were investigated using transmission electron microscopy (TEM), gas adsorption porosimetry, and lipophilic dye separations. The results collectively show that the most significant changes occur over the first few nanometers of ALD coating. They further demonstrate independent control of film microstructure and surface characteristics. ALD coatings can enhance complex GLAD microstructures to engineer new composite nanomaterials potentially useful in analytical chromatography.
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Affiliation(s)
- S R Jim
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada.
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21
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Hall J, Taschuk M, Brett M. Polarity-adjustable reversed phase ultrathin-layer chromatography. J Chromatogr A 2012; 1266:168-74. [DOI: 10.1016/j.chroma.2012.10.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 10/05/2012] [Accepted: 10/08/2012] [Indexed: 11/16/2022]
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22
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Siewert JMA, LaForge JM, Taschuk MT, Brett MJ. Disassembling glancing angle deposited films for high-throughput, single-post growth scaling measurements. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2012; 18:1135-1142. [PMID: 23095449 DOI: 10.1017/s1431927612001080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
With growing interest in nanostructured thin films produced by glancing angle deposition (GLAD), it becomes increasingly important to understand their overall growth mechanics and nanocolumn structure. We present a new method of isolating the individual nanocolumns of GLAD films, facilitating automated measurement of their broadening profiles. Data collected for α = 81° TiO2 vertical nanocolumns deposited across a range of substrate rotation rates demonstrates that these rates influence growth scaling parameters. Further, individual posts were found in each case that violate predicted Kardar-Parisi-Zhang growth scaling limits. The technique's current iteration is comparable to existing techniques in speed: though data were studied from 10,756 individual objects, the majority could not be confidently used in subsequent analysis. Further refinement may allow high-throughput automated film characterization and permit close examination of subtle growth trends, potentially enhancing control over GLAD film broadening and morphology.
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Affiliation(s)
- Joshua Morgan Arthur Siewert
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada. jsiewert@ualberta
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Chen J, Abell J, Huang YW, Zhao Y. On-chip ultra-thin layer chromatography and surface enhanced Raman spectroscopy. LAB ON A CHIP 2012; 12:3096-3102. [PMID: 22740336 DOI: 10.1039/c2lc40221a] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We demonstrate that silver nanorod (AgNR) array substrates can be used for on-chip separation and detection of chemical mixtures by combining ultra-thin layer chromatography (UTLC) and surface enhanced Raman spectroscopy (SERS). The UTLC-SERS plate consists of an AgNR array fabricated by oblique angle deposition. The capability of the AgNR substrates to separate the different compounds in a mixture was explored using a mixture of four dyes and a mixture of melamine and Rhodamine 6G at varied concentrations with different mobile phase solvents. After UTLC separation, spatially-resolved SERS spectra were collected along the mobile phase development direction and the intensities of specific SERS peaks from each component were used to generate chromatograms. The AgNR substrates demonstrate the potential for separating the test dyes with plate heights as low as 9.6 μm. The limits of detection are between 10(-5)-10(-6) M. Furthermore, we show that the coupling of UTLC with SERS improves the SERS detection specificity, as small amounts of target analytes can be separated from the interfering background components.
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Affiliation(s)
- Jing Chen
- Nanoscale Science and Engineering Center, Department of Food Science and Technology, University of Georgia, Athens, GA 30602, USA.
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Oko A, Jim S, Taschuk M, Brett M. Time resolved chromatograms in ultra-thin layer chromatography. J Chromatogr A 2012; 1249:226-32. [DOI: 10.1016/j.chroma.2012.05.090] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2012] [Revised: 05/23/2012] [Accepted: 05/24/2012] [Indexed: 11/17/2022]
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25
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Jim S, Oko A, Taschuk M, Brett M. Morphological modification of nanostructured ultrathin-layer chromatography stationary phases. J Chromatogr A 2011; 1218:7203-10. [DOI: 10.1016/j.chroma.2011.08.024] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 08/08/2011] [Accepted: 08/09/2011] [Indexed: 11/28/2022]
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