Poly(ethylene glycol) as structure directing agent in sol–gel synthesis of amorphous silica

Горбунова, О.В.; Бакланова, О. Н.; Gulyaeva, T. I.; Тренихин, М. В.; Дроздов, В. А.

doi:10.1016/j.micromeso.2014.02.013

Cited by 20 publications

(12 citation statements)

References 40 publications

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“…It is desirable to use PEG of low molecular weight to create a network of interconnected micropores in the films since such PEG can be easily removed after annealing for a shorter time compared to PEG of high molecular weight [27,30]. Therefore, a peroxotungstic acid-based precursor solution was used with addition of PEG 400, PEG 600 (for a formation of micropores [37]) or the diblock copolymer PIB 50 -b-PEO 45 that had been successfully used for the preparation of mesoporous titanium oxide [35,38]. To obtain WO 3 thin films with interconnected mesopores, a mixture of PEG 600 and PIB 50 -b-PEO 45 was established.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Spectroelectrochemical Performance of WO3 Films by Use of Structure-Directing Agents during Film Growth

et al. 2022

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Thin, porous films of WO3 were fabricated by solution-based synthesis via spin-coating using polyethylene glycol (PEG), a block copolymer (PIB50-b-PEO45), or a combination of PEG and PIB50-b-PEO45 as structure-directing agents. The influence of the polymers on the composition and porosity of WO3 was investigated by microwave plasma atomic emission spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, X-ray diffraction, and gas sorption analysis. The electrochromic performance of the WO3 thin films was characterized with LiClO4 in propylene carbonate as electrolyte. To analyze the intercalation of the Li+ ions, time-of-flight secondary ion mass spectrometry, and X-ray photoelectron spectroscopy were performed on films in a pristine or reduced state. The use of PEG led to networks of micropores allowing fast reversible electrochromic switching with a high modulation of the optical transmittance and a high coloration efficiency. The use of PIB50-b-PEO45 provided isolated spherical mesopores leading to an electrochromic performance similar to compact WO3, only. Optimum characteristics were obtained in films which had been prepared in the presence of both, PEG and PIB50-b-PEO45, since WO3 films with mesopores were obtained that were interconnected by a microporous network and showed a clear progress in electrochromic switching beyond compact or microporous WO3.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Spectroelectrochemical Performance of WO3 Films by Use of Structure-Directing Agents during Film Growth

et al. 2022

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“…Sol–gel studies have suggested that the association of PEG macromolecules to form densely tangled sol–gel particle-PEG complexes occur only at the surface of the sol–gel polymer, resulting in very low amounts of PEG within the micropores of the sol–gel polymer [ 30 , 38 ]. PEG macromolecules have been shown to prevent bacterial adhesion when surfaces are coated with PEG [ 39 ].…”

Section: 3 Non-specific Adsorption Of Targeted Bacteria On Non-impmentioning

confidence: 99%

Pathogen-Imprinted Organosiloxane Polymers as Selective Biosensors for the Detection of Targeted E. coli

Dulay¹,

Zaman²,

Jaramillo³

et al. 2018

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Early detection of pathogens requires methods that are fast, selective, sensitive and affordable. We report the development of a biosensor with high sensitivity and selectivity based on the low-cost preparation of organosiloxane (OSX) polymers imprinted with E. coli-GFP (green fluorescent protein). OSX polymers with high optical transparency, no cracking, and no shrinkage were prepared by varying several parameters of the sol-gel reaction. The unique shape and chemical fingerprint of the targeted inactivated E. coli-GFP were imprinted into bulk polymers by replication imprinting where the polymer solution was dropcast onto a bacteria template that produced a replica of the bacterial shape and chemistry on the polymer surface upon removal of the template. Capture performances were studied under non-laminar flow conditions with samples containing inactivated E. coli-GFP and compared to inactivated S. typhimurium-GFP. Capture selectivity ratios are dependent on the type of alkoxysilanes used, the H 2 O:silane molar ratio, and the polymerization temperature. The bacteria concentration in suspension ranged from~6 × 10 5 to 1.6 × 10 9 cells/mL. E. coli-imprinted OSX polymers with polyethylene glycol (PEG) differentiated between the targeted bacterium E. coli, and non-targeted bacteria S. typhimurium and native E. coli-GFP, achieving selectivity ratios up to 4.5 times higher than polydimethylsiloxane (PDMS) and OSX polymers without PEG.

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“…High-molecular organic polymers play the role of a structure-forming matrix for ORMOSIL; one of such polymers is polyethylene glycol (PEG) [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. PEG has hydrophobic hydrocarbon fragments and hydrophilic oxygen bridges, so this polymer can change its polarity depending on the nature of the solvent or other components in the system [ 35 , 36 , 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

Biocompatible Silica-Polyethylene Glycol-Based Composites for Immobilization of Microbial Cells by Sol-Gel Synthesis

et al. 2023

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Biocatalysts based on the methylotrophic yeast Ogataea polymorpha VKM Y-2559 immobilized in polymer-based nanocomposites for the treatment of methanol-containing wastewater were developed. The organosilica composites with different matrix-to-filler ratios derived from TEOS/MTES in the presence of PEG (SPEG-composite) and from silicon-polyethylene glycol (STPEG-composite) differ in the structure of the silicate phase and its distribution in the composite matrix. Methods of fluorescent and scanning microscopy first confirmed the formation of an organosilica shell around living yeast cells during sol-gel bio-STPEG-composite synthesis. Biosensors based on the yeast cells immobilized in STPEG- and SPEG-composites are characterized by effective operation: the coefficient of sensitivity is 0.85 ± 0.07 mgO2 × min−1 × mmol−1 and 0.87 ± 0.05 mgO2 × min−1 × mmol−1, and the long-term stability is 10 and 15 days, respectively. The encapsulated microbial cells are protected from UV radiation and the toxic action of heavy metal ions. Biofilters based on the developed biocatalysts are characterized by high effectiveness in the utilization of methanol-rich wastewater—their oxidative power reached 900 gO2/(m3 × cycle), and their purification degree was up to 60%.

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Poly(ethylene glycol) as structure directing agent in sol–gel synthesis of amorphous silica

Cited by 20 publications

References 40 publications

Enhancing the Spectroelectrochemical Performance of WO3 Films by Use of Structure-Directing Agents during Film Growth

Enhancing the Spectroelectrochemical Performance of WO3 Films by Use of Structure-Directing Agents during Film Growth

Pathogen-Imprinted Organosiloxane Polymers as Selective Biosensors for the Detection of Targeted E. coli

Biocompatible Silica-Polyethylene Glycol-Based Composites for Immobilization of Microbial Cells by Sol-Gel Synthesis

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