Producing of Monolithic Layers of Silica for Thin-Layer Chromatography by Sol-Gel Synthesis

Frolova, A. M.; Chukhlieb, M. A.; Drobot, A. V.; Kryshtal, A. P.; Loginova, Lidia P.; Boichenko, Alexander P.

doi:10.2174/1876531900901010040

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…Silica is a highly versatile material, with many applications in filtration, separation or removal of pollutants, as the catalytic support, or as the material for gas storage systems due to its high and tunable porosity. − When prepared in the form of porous monoliths, silica shows an intrinsic high brittleness. Silica is also one of the materials of choice in the preparation of polymer composites because silica particles can be prepared in large quantities for a low price and in a very wide range of sizes and shapes .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Machine-Learning Methods of Nacre-like Composites from the Self-Assembly of Magnetic Colloids Exposed to Rotating Magnetic Fields

Medinger

Nedyalkova

Furlan

et al. 2021

ACS Appl. Mater. Interfaces

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Composite materials designed by nature, such as nacre, can display unique mechanical properties and have therefore been often mimicked by scientists. In this work, we prepared composite materials mimicking the nacre structure in two steps. First, we synthesized a silica gel skeleton with a layered structure using a bottom-up approach by modifying a sol–gel synthesis. Magnetic colloids were added to the sol solution, and a rotating magnetic field was applied during the sol–gel transition. When exposed to a rotating magnetic field, magnetic colloids organize in layers parallel to the plane of rotation of the field and template the growing silica phase, resulting in a layered anisotropic silica network mimicking the nacre’s inorganic phase. Heat treatment has been applied to further harden the silica monoliths. The final nacre-inspired composite is created by filling the porous structure with a monomer, leading to a soft elastomer upon polymerization. Compression tests of the platelet-structured composite show that the mechanical properties of the nacre-like composite material far exceed those of nonstructured composite materials with an identical chemical composition. Increased toughness and a nearly 10-fold increase in Young’s modulus were achieved. The natural brittleness and low elastic deformation of silica monoliths could be overcome by mimicking the natural architecture of nacre. Pattern recognition obtained with a classification of machine learning algorithms was applied to achieve a better understanding of the physical and chemical parameters that have the highest impact on the mechanical properties of the monoliths. Multivariate statistical analysis was performed to show that the structural control and the heat treatment have a very strong influence on the mechanical properties of the monoliths.

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Section: Introductionmentioning

confidence: 99%

Preparation and Machine-Learning Methods of Nacre-like Composites from the Self-Assembly of Magnetic Colloids Exposed to Rotating Magnetic Fields

Medinger

Nedyalkova

Furlan

et al. 2021

ACS Appl. Mater. Interfaces

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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: 99%

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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“…Recently, however, there have been efforts to apply newer technologies and materials to TLC. These have included monolithic silica, [1,2] electrospun polymer fibers, [3,4] monolithic porous polymer layers, [5,6] and vacuum deposition of glancing angle deposition structures. [7,8] Some of us have also been active in this area, microfabricating TLC plates based on infiltrated, patterned carbon nanotube (CNT) forests, [9][10][11][12] and characterizing the materials in them.…”

Section: Introductionmentioning

confidence: 99%

Hydroxylation of the silica in microfabricated thin layer chromatography plates as probed by time-of-flight secondary ion mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Kanyal

Singh

Cushman

et al. 2014

Surf. Interface Anal.

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Microfabricated silica thin layer chromatography (TLC) plates have previously been prepared on patterned carbon nanotube forests. The high temperatures used in their fabrication reduce the number of hydroxyl groups on their surfaces. Fortunately, silica can be rehydroxylated. In diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), a silanol peak below 3740 cm À1 indicates a well-hydroxylated silica surface that is fit for chromatography. Hydroxylations of our materials with HF are so effective that it is not possible to discern the position of this peak. In contrast, this signal is discernable when the plates are treated with NH 4 OH. To find a more convenient method for studying the surfaces of TLC plates, time-of-flight secondary ion mass spectroscopy (ToF-SIMS) was considered. ToF-SIMS is advantageous because multiple microfabricated TLC plates must be scraped to obtain enough silica for one DRIFT analysis, while static SIMS can be performed on very small regions (500 × 500 μm 2 or less) of individual plates. Ratios of the SiOH + and Si + ToF-SIMS signals for microfabricated TLC plates correlated well with~3740 cm À1 silanol peaks from DRIFT. Thus, SIMS allows direct analysis of all of our treated and untreated plates, including those hydroxylated with HF. The best hydroxylation condition for HF, which was better than any studied for NH 4 OH, was around 150 ppm at room temperature. The best hydroxylation condition for NH 4 OH was 50°C for 72 h. ToF-SIMS versus DRIFT results of commercial TLC plates were also obtained and evaluated.

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Producing of Monolithic Layers of Silica for Thin-Layer Chromatography by Sol-Gel Synthesis

Cited by 11 publications

References 18 publications

Preparation and Machine-Learning Methods of Nacre-like Composites from the Self-Assembly of Magnetic Colloids Exposed to Rotating Magnetic Fields

Preparation and Machine-Learning Methods of Nacre-like Composites from the Self-Assembly of Magnetic Colloids Exposed to Rotating Magnetic Fields

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

Hydroxylation of the silica in microfabricated thin layer chromatography plates as probed by time-of-flight secondary ion mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

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