Pore expanding effect of hydrophobic agent on 100 nm-sized mesoporous silica particles estimated based on Hansen solubility parameters

Fujimoto, Kota; Watanabe, Kanako; Ishikawa, Shunho; Ishii, Haruyuki; Suga, Kazuyoshi; Nagao, Daisuke

doi:10.1016/j.colsurfa.2020.125647

Cited by 8 publications

(3 citation statements)

References 47 publications

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“…In the CTAB hydrolysis stage, gelatin and NaOH produce a sol in the form of micro-sized particles suspended in the solution. The subsequent step is the gel, which is the polycondensation reaction in the form of a transition from the sol to a gel, during which the micro solids begin to condense into a more complicated network [28]. In the polycondensation stage, the interaction of CTAB, gelatin and alkaline solution drives droplet size so that the gel formed is a collection of semi-solid microdroplets.…”

Section: Resultsmentioning

confidence: 99%

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Ulfa,

Anggreani,

Mulyani

et al. 2024

Bull. Chem. React. Eng. Catal.

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Hexagonal TiO2/SiO2 Porous Microplates have been successfully synthesized by incorporation of Ti precursors into SiO2 synthesized from Si precursors in a gelatin-CTAB mixture via the hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), EDX, nitrogen adsorption-desorption and Fourier transform infrared spectroscopy (FTIR). The sample has a surface area of 735 m2/g, pore volume of 0.67 cc/g, and pore diameter of 3.2 nm, according to the results of the characterization of hexagonal TiO2/SiO2 porous microplates. The transformation of SiO2 microspheres into hexagonal TiO2/SiO2 porous microplates is revealed by a microparticle size increase of 84% and the transition of Si−O bonds into Ti−O and Si−O as measured by FTIR. The photocatalytic activity of hexagonal TiO2/SiO2 porous microplates resulted in 81.15% photodegradation of methylene blue under UV light irradiation within 60 min, which was 21 % better than SiO2. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Section: Resultsmentioning

confidence: 99%

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Ulfa,

Anggreani,

Mulyani

et al. 2024

Bull. Chem. React. Eng. Catal.

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“…The micelle templating method has been widely employed for preparing porous materials since its discovery by Beck et al in 1992. The micelle templating method is also applicable for coating spherical silica particles with mesoporous shells (SiO 2 @ m SiO 2 ). , Our research group − succeeded in synthesizing spherical mesoporous silica particles with and without nonporous cores using the micelle templating method in which a cationic surfactant, cetyltrimethylammonium bromide (CTAB), was used. ,,, Some other researchers reported an approach to effectively form mesoporous shells on the core particles. The conditions for the synthesis of SiO 2 @ m SiO 2 , including the concentrations of the silica source ,, and core particles, , were varied to control the thickness of the mesoporous shells.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Secondary Particle Number with the Debye–Hückel Parameter for Thickening Mesoporous Silica Shells Formed on Spherical Cores

et al. 2021

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Mesoporous silica shells were formed on nonporous spherical silica cores during the sol−gel reaction to elucidate the mechanism for the generation of secondary particles that disturb the efficient growth of mesoporous shells on the cores. Sodium bromide (NaBr) was used as a typical electrolyte for the sol−gel reaction to increase the ionic strength of the reactant solution, which effectively suppressed the generation of secondary particles during the reaction wherein a uniform mesoporous shell was formed on the spherical core. The number of secondary particles (N 2nd ) generated at an ethanol/water weight ratio of 0.53 was plotted against the Debye−Huckel parameter κ to quantitatively understand the Debye screening effect on secondary particle generation. Parameter κa, where a is the average radius of the secondary particles finally obtained in the silica coating, expresses the trend in N 2nd at different concentrations of ammonia and NaBr. N 2nd was much lower than that expected theoretically from the variation of secondary particle sizes at a constant Debye− Huckel parameter. A similar correlation with κa was observed at the high and low ethanol/water weight ratios of 0.63 and 0.53, respectively, with different hydrolysis rate constants. The good correlation between N 2nd and κa revealed that controlling the ionic strength of the silica coating is an effective approach to suppress the generation of secondary particles for designing mesoporous shells with thicknesses appropriate for their application as high-performance liquid chromatography column packing materials.

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“…However, declining textural and structural material by increasing iron improved the photocatalytic activity due to the site's active enhancement [41][42][43][44][45]. The application of Pluronic P123 as a template or surfactant increased the uniformity of particle growth during the thermal treatment and stabilized the crystal phase at higher heating temperatures [46][47][48][49][50][51][52][53][54][55][56]. Moreover, according to the review, the synthesis of Fe-TiO2 with various methods and conditions showed an increase in a specific surface area from 100 m 2 /g to 160 m 2 /g depending on the type of materials, surfactants, ratios of surfactants, Fe, and Ti precursors, and calcination condition .…”

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confidence: 99%

Comparation Review between of Titania (TiO<sub>2</sub>) Synthesis Using CTAC and Fe-TiO<sub>2</sub> Synthesis Using Pluronic P123 as Surfactant

Ulfa,

Anjelina,

Nina

2023

MSF

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This study reviewed the synthesis of Titania with different shapes in the presence of cetyltrimethylammonium chloride (CTAC) as the famous stabilizer for directly altering the morphology and dimensions. These CTAC stabilizers usually provide the synthesis of Titania with a narrow size distribution and mostly single-crystalline structures in high yields. Many papers on the synthesis of Titania are available. However, only a few articles focus on the synthesis of Titania using CTAC as the stabilizer. The general rule for the shape transformation of Titania by CTAC stabilizer can be easily summarized based on the literature during the last ten year from https://www.sciencedirect.com/ as the data source.

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Pore expanding effect of hydrophobic agent on 100 nm-sized mesoporous silica particles estimated based on Hansen solubility parameters

Cited by 8 publications

References 47 publications

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Hexagonal TiO2/SiO2 Porous Microplates for Methylene Blue Photodegradation

Correlation of Secondary Particle Number with the Debye–Hückel Parameter for Thickening Mesoporous Silica Shells Formed on Spherical Cores

Comparation Review between of Titania (TiO<sub>2</sub>) Synthesis Using CTAC and Fe-TiO<sub>2</sub> Synthesis Using Pluronic P123 as Surfactant

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