Influence of different solvents on the morphology of APTMS-modified silicon surfaces

Jakša, Gregor; Štefane, Bogdan; Kovač, Janez

doi:10.1016/j.apsusc.2014.05.157

Cited by 50 publications

(36 citation statements)

References 27 publications

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“…The similar reaction was also reported to take place in water as a polar protic solvent . Through atomic force and scanning electron microscopy studies, Jaksa et al . showed that the silanization of silicon surfaces in acetonitrile and toluene leads to the formation of a rough surface with a large density of amine polymerized molecules in the form of islands.…”

Section: Resultsmentioning

confidence: 60%

“…In the case of wet fibers, it is hypothesized that aminosilane was spontaneously solvelyzed in ethanol, as previously shown by other researchers . The similar reaction was also reported to take place in water as a polar protic solvent . Through atomic force and scanning electron microscopy studies, Jaksa et al .…”

Section: Resultsmentioning

confidence: 60%

“…Both wet and dry fibers treated in ethanol resulted in higher surface area, primarily because of the solvolysis of APS‐NH 2 with ethanol hydroxyl groups which can potentially be leached out with solvents after grafting. The solvolysis of APS with ethanol was confirmed by Kovac and co‐workers . The better solubility of APS in polar solvents (i.e., acetone and ethanol) and higher silane–silica grafting in nonpolar solvents (i.e., toluene) could offer a means for infusion control during the amine grafting process.…”

Section: Resultsmentioning

confidence: 81%

“…The Brunauer–Emmett–Teller (BET) surface area for the bare Zr–Ti–Si/PAI‐HF was calculated to be 57 m 2 g −1 compared to 19, 20, and 17 m 2 g −1 for APS‐grafted dry‐fiber in acetone, ethanol, and toluene, respectively. The surface area of APS‐grafted Zr–Ti–Si/PAI‐HF decreased in the following order: bare fiber≫wet ethanol>wet acetone>dry ethanol>dry acetone≫dry toluene>wet toluene, which presumably reflects the tendency for condensation in the polymerization of silane–silane and silane–silica grafting,,,,, as discussed below.…”

Section: Resultsmentioning

confidence: 88%

“…Basically, amine‐containing molecules need to diffuse into the pores first and then build a covalent bond between the amine–alkoxy groups by grafting . Toluene is the most commonly used solvent for performing aminosilane grafting at high temperatures (≈85 °C); however amine grafting can also be performed using water, acetone, or a mixture of solvents . The replacement of toluene by ethanol and acetone has been previously studied to functionalize sorbents at room temperature, which promotes rapid diffusion into the cavities of the mesoporous materials and swelling of the polymer matrix .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of Post‐Functionalization Conditions on the Carbon Dioxide Adsorption Properties of Aminosilane‐Grafted Zirconia/Titania/Silica‐Poly(amide‐imide) Composite Hollow Fiber Sorbents

Brennan

Thakkar

et al. 2016

Energy Tech

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In this study, 3‐aminopropyltrimethoxysilane (APS) was used as a grafting agent in three solvents with different polarities for post‐functionalization of a ZrO2–TiO2–SiO2/poly(amide‐imide) composite hollow fiber sorbent (Zr–Ti–Si/PAI‐HF) at ambient temperature. The same fiber at two different states: (i) wet (as‐spun) and (ii) dry were used for amine grafting. The influence of the polarity/nature of various solvents such as acetone, ethanol, and toluene on the CO2 sorption characteristics of wet and dry Zr–Ti–Si/PAI‐HF fibers was investigated accordingly. Several parameters such as grafting time (1–4 h), amine concentration (10–50 wt %), and solvent type (acetone, ethanol, and toluene) were systematically varied. The CO2 sorption capacity and breakthrough tests were performed under simulated flue gas conditions for grafted fiber composites. Our results indicate that the CO2 sorption capacity of amine‐grafted Zr–Ti–Si/PAI‐HF strongly depends on both the type of solvent and the state of the fibers (i.e., dryness or wetness). The APS grafting of wet fibers performed in toluene led to high amine loading and CO2 capacity (1.40 mmol g−1), whereas dry fibers gave rise to a relatively low CO2 capacity (0.90 mmol g−1). In contrast, dry fibers functionalized in either acetone or ethanol exhibited higher CO2 capacity compared to the wet fibers prepared in the same solvent. By using ethanol as a solvent, the solvolysis of the Si−O−Si linkages is much faster than the competitive condensation reaction between the silanol groups (Si−OH) of APS moieties and hydroxyl group (OH) of the ethanol, which leads to the lower siloxane formation. In the case of acetone, a dense polymeric network is formed under condensation reaction between an acetone molecule and the amine moieties, thus reducing the amount of primary amine groups available for interacting with the CO2 molecules.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Post‐Functionalization Conditions on the Carbon Dioxide Adsorption Properties of Aminosilane‐Grafted Zirconia/Titania/Silica‐Poly(amide‐imide) Composite Hollow Fiber Sorbents

Brennan

Thakkar

et al. 2016

Energy Tech

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Interaction Study of Anti‐E. coli Immobilization on 1DZnO at Nanoscale for Optical Biosensing Application

Salinas

Galdámez‐Martínez

Tolibia

et al. 2023

Adv Materials Inter

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Developing low‐cost biosensing platforms for robust detection response and sensitivity at low concentrations is of great interest. This work reports synthesizing 1D ZnO nanostructured materials (1DZnO) with controllable properties utilizing a metal catalyst‐assisted vapor phase growth technique (VLS). The obtained materials are functionalized with (3‐aminopropyl) trimetoxysilane (APTMS) and immobilized with anti‐Escherichia coli enteropathogenic (EPEC) antibodies. Characterization results show changes in the optical and structural properties of 1DZnO that are correlated with the biofunctionalization methodologies. Further, the biofunctionalization process is assessed on 1DZnO surface platforms to obtain acceptable antibody immobilization efficiencies (52%, 96%, and 100%) using a low‐concentration antibody solution (30 µg ml−1). Special techniques such as focused ion beam micromachining and scanning tunneling electron microscopy are proposed to appreciate the semiconductor biofunctionalization layer around 1DZnO and explain the physics of the interaction process. It is found that morphology obtained from distinct synthesis methods, solvents, and functionalization agents can generate functional groups for biomolecule attachment. Remarkably, it is demonstrated that biofunctionalization on 1DZnO takes place all over a single nanostructure. This work presents a proof‐of‐concept focused on generating pathogen sensing platforms using 1DznO semiconducting materials, providing new insights into bio‐analytes interaction with structures at the nanoscale.

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Organic Compound Modified Cu‐Based Catalysts for the Hydrogenation of Esters

Cui,

Jing,

2024

ChemCatChem

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Cu/SiO2 catalysts are widely applied to the hydrogenation of dimethyl oxalate and ethylene carbonate to the corresponding ethylene glycol and methanol simultaneously, while ethylene glycol and methanol are important bulk commodities and raw materials for the production of oxygen‐containing chemicals and fuels. However, Cu particles usually aggregate or sinter to deactivate and the ratio of surface Cu0/Cu+ species is also difficult to control under the reaction conditions, so that the catalyst activity and stability is still a big challenge. It was found that modification of Cu‐based catalysts with some organic compounds inhibited the agglomeration of Cu particles, regulated the ratio of surface Cu0/Cu+ species, and even generated a carbon layer to protect the Cu particles, which definitely improved the stability of the catalyst along with the enhanced catalytic performance. In this review, recent developments in ester hydrogenation over organic compounds‐modified Cu/SiO2 catalysts were summarized and the issues to be further clarified are discussed as well.

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Influence of different solvents on the morphology of APTMS-modified silicon surfaces

Cited by 50 publications

References 27 publications

Effect of Post‐Functionalization Conditions on the Carbon Dioxide Adsorption Properties of Aminosilane‐Grafted Zirconia/Titania/Silica‐Poly(amide‐imide) Composite Hollow Fiber Sorbents

Effect of Post‐Functionalization Conditions on the Carbon Dioxide Adsorption Properties of Aminosilane‐Grafted Zirconia/Titania/Silica‐Poly(amide‐imide) Composite Hollow Fiber Sorbents

Interaction Study of Anti‐E. coli Immobilization on 1DZnO at Nanoscale for Optical Biosensing Application

Organic Compound Modified Cu‐Based Catalysts for the Hydrogenation of Esters

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