Preparation of silica coatings with continuously adjustable refractive indices and wettability properties <i>via</i> sol–gel method

Xia, Bibo; Yan, Lianghong; Li, Yuanyang; Zhang, Shuming; He, Maogang; Li, Hao; Yan, Hongwei

doi:10.1039/c7ra12817g

Cited by 30 publications

(22 citation statements)

References 37 publications

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“…The thickness of silica onto surface of MNPs could be increased by varying the molar ratio of H 2 O/tetra-ethyl orthosilicate (TEOS). 43 On increasing the molar ratio, the size of silica coating also increases. The SEM images supported the formation of spherically shaped Fe 3 O 4 NPs, which was in accordance with TEM analysis.…”

Section: ■ Introductionmentioning

confidence: 99%

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO₂@Fe₃O₄ Nanoparticles

et al. 2020

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An ecofriendly, magnetically retrievable amine-functionalized SiO2@Fe3O4 catalyst was successfully synthesized and affirmed by several physicochemical characterization tools, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM), energy-dispersive X-ray spectroscopy (EDX), and powder X-ray diffraction. Thereafter, the catalytic performance of this environmentally benign NH2@SiO2@Fe3O4 catalyst was investigated in the one-pot multicomponent synthesis of 2-amino-4H-benzo[b]pyran derivatives. The reaction was simply achieved by grinding of various substituted aromatic aldehydes, dimedone, and malononitrile at room temperature under solvent and waste-free conditions with excellent yields and high purity. Moreover, the developed catalyst not only possesses immense potential to accelerate the synthesis of bioactive pyran derivatives but also exhibits several remarkable attributes like broad functional group tolerance, durability, improved yield, reusability, and recyclability. Besides, various other fascinating advantages of this protocol are milder reaction conditions, cost effectiveness, short reaction time, and simple work up procedures.

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Section: ■ Introductionmentioning

confidence: 99%

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO₂@Fe₃O₄ Nanoparticles

et al. 2020

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“…4a (left axis; black symbols) and correlate with measured contact angles (right axis; orange symbols). 40 A larger simulated hydrophilicity implies a better interaction with the surface thus better wetting so that the experimental contact angle decreases. A closer inspection of Fig.…”

Section: Discussionmentioning

confidence: 99%

From time dependent incorporation of molecular building blocks to application properties for inorganic and organic three-dimensional network polymers

Keer¹,

Kilic²,

Steenberge³

et al. 2020

Preprint

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The three-dimensional configurational arrangement of natural and synthetic network materials determines their application range. Control of the real time incorporation of each building block, hence, all functional groups is desired so that we can regulate macroscopic properties from the molecular level onwards. Here we interconnect kinetic Monte Carlo simulations from the field of chemical kinetics and molecular dynamic simulations from the field of physics. We visualize for (in)organic network material synthesis how the initial building blocks interact timewise and spatially, accounting for variations in inter- and intramolecular chemical reactivity, diffusivity, segmental compositions, branch/network point locations, and defects. We use the kinetic and three-dimensional structural information to construct structure-property relationships based on molecular descriptors such as the molecular pore size or dangling chain distribution, differentiating between ideal and non-ideal structural elements. The generic nature is illustrated by constructing such relationships for the synthesis of organosilica, epoxy-amine and Diels-Alder based networks.

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“…Compared with the mentioned methods, the sol-gel process is the most used method for preparing the hybrid silica coatings due to its main advantages, such as easy preparation at room temperature, low cost of process, reproducibility, high flexibility in composition and selectivity, good mechanical adherence to the substrate, high purity of the resulting materials, and high thermal stability [10][11][12]. Iline-Vul et al [13] obtained fluorine-conjugated silica microparticles using the sol-gel technique.…”

Section: Introductionmentioning

confidence: 99%

Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

Purcar

Rădiţoiu

et al. 2021

Applied Sciences

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In this research, we report a simple and inexpensive way to prepare transparent and hydrophobic hybrid coatings through deposition of different silica materials on polyvinyl chloride (PVC) substrates. The silica materials were prepared using an acid-catalyzed sol–gel method at room temperature (25 ± 2 °C), using alkoxysilanes: tetraethoxysilane (TEOS), as the silica source, and ethoxydimethylvinylsilane (DMVES), triethoxyoctylsilane (OTES), and trimethoxyhexadecylsilane (HDTMES), as modifier agents. The obtained materials were characterized (either as powders or as thin films) by Fourier-transform infrared spectroscopy (FTIR), UV/Vis spectroscopy, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), atomic force microscopy (AFM), spectroscopic ellipsometry (SE), and water contact-angle measurements. UV/Vis spectra showed that the PVC substrate coated with the silica material containing TEOS/DMVES/OTES had a transmittance of about 90% in the wavelength range of 650–780 nm. The water contact angles increased from 83° for uncoated PVC substrate to ~94° for PVC substrates coated with the sol–gel silica materials. These PVC films with hybrid silica coatings can be used as the materials for outdoor applications, such as energy-generating solar panel window blinds or PVC clear Windmaster outdoor blinds.

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Preparation of silica coatings with continuously adjustable refractive indices and wettability properties via sol–gel method

Abstract: Silica coatings with continuously adjustable refractive indices and wettability properties were prepared through a sol–gel base-catalyzed process.

Cited by 30 publications

References 37 publications

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO₂@Fe₃O₄ Nanoparticles

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO₂@Fe₃O₄ Nanoparticles

From time dependent incorporation of molecular building blocks to application properties for inorganic and organic three-dimensional network polymers

Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

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Preparation of silica coatings with continuously adjustable refractive indices and wettability properties via sol–gel method

Abstract: Silica coatings with continuously adjustable refractive indices and wettability properties were prepared through a sol–gel base-catalyzed process.

Cited by 30 publications

References 37 publications

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO2@Fe3O4 Nanoparticles

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO2@Fe3O4 Nanoparticles

From time dependent incorporation of molecular building blocks to application properties for inorganic and organic three-dimensional network polymers

Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

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Product

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Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO₂@Fe₃O₄ Nanoparticles

Green and Mechanochemical One-Pot Multicomponent Synthesis of Bioactive 2-amino-4H-benzo[b]pyrans via Highly Efficient Amine-Functionalized SiO₂@Fe₃O₄ Nanoparticles