Effect of organic-silane additives on textural–structural properties of mesoporous silicate materials

Кондрашова, Н. Б.; Saenko, E. V.; Lebedeva, I. I.; Вальцифер, В. А.; Стрельников, В. Н.

doi:10.1016/j.micromeso.2011.12.017

Cited by 15 publications

(3 citation statements)

References 15 publications

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“…This trend toward a more disordered mesoporous phase upon integration of an organic linker was also reported by Travaglini et al, who studied the integration of linkers in MS particles, with a higher content of the organic linker resulting in broader and less intense SAXS peaks. Thus, it appears that the presence of the bulky, hydrophobic, organic LB linker hinders the formation of an ordered mesoporous phase in C/S-UCNP-LBMS-100, confirming our hypothesis presented above.…”

Section: Resultssupporting

confidence: 88%

Upconverting Nanoparticles Coated with Light-Breakable Mesoporous Silica for NIR-Triggered Release of Hydrophobic Molecules

Tam,

Picchetti,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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Upconverting nanoparticles (UCNPs) doped with Yb3+ and Tm3+ are near-infrared (NIR) to ultraviolet (UV) transducers that can be used for NIR-controlled drug delivery. However, due to the low quantum yield of upconversion, high laser powers and long irradiation times are required to trigger this drug release. In this work, we report the one-step synthesis of a nanocomposite consisting of a LiYbF4:Tm3+@LiYF4 UCNP coated with mesoporous UV-breakable organosilica shells of various thicknesses. We demonstrate that a thin shell accelerates the breakage of the shell at 1 W/cm2 NIR light exposure, a laser power up to 9 times lower than that of conventional systems. When the mesopores are loaded with hydrophobic vitamin D3 precursor 7-dehydrocholesterol (7-DH), shell breakage results in subsequent cargo release. Its minimal toxicity in HeLa cells and successful internalization into the cell cytoplasm demonstrate its biocompatibility and potential application in biological systems. The tunability of this system due to its simple, one-step synthesis process and its ability to operate at low laser powers opens up avenues in UCNP-powered NIR-triggered drug delivery toward a more scalable, flexible, and ultimately translational option.

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Section: Resultssupporting

confidence: 88%

Upconverting Nanoparticles Coated with Light-Breakable Mesoporous Silica for NIR-Triggered Release of Hydrophobic Molecules

Tam,

Picchetti,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

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“…The chemical reagents used in this study are as follows: tetraethoxysilane Si(OC 2 H 5 ) 4 (TEOS, 98%), (3-aminopropyl) In order to find a proper functional additive for fire and explosion suppression compositions based on ammonium phosphate, we tested different types of silica materials: MCM-41 (samples S1 and S2), MCM-48 (sample S3), SBA-15 (sample S4), and Aerosil 380 (sample S5). The mole ratios for the components of mesoporous silica oxide samples were determined based on the results of the previous studies in which the samples were synthesized by the template hydrothermal synthesis method: 52,53 The 20−50 μm size fraction (average particle diameter of 35 μm) was selected as most effective for fire-extinguishing ability. An increase in powder dispersion would result in better fire-extinguishing efficiency, yet the higher the dispersion, the worse the powder flows.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…In order to find a proper functional additive for fire and explosion suppression compositions based on ammonium phosphate, we tested different types of silica materials: MCM-41 (samples S1 and S2), MCM-48 (sample S3), SBA-15 (sample S4), and Aerosil 380 (sample S5). The mole ratios for the components of mesoporous silica oxide samples were determined based on the results of the previous studies in which the samples were synthesized by the template hydrothermal synthesis method: , sample S1, 1:0.2:3.5:100 TEOS/CTAB/NH 3 /H 2 O; sample S2, 1:0.4:0.1:0.4:100 TEOS/CTAB/(3-aminopropyl)trimethoxysilane (APTMS)/NaOH/H 2 O; sample S3, 1:0.4:0.4:100 TEOS/CTAB/NaOH/H 2 O; sample S4, 1:0.017:3.45:41 TEOS/Pluronic P-123/HCl/H 2 O.…”

Section: Experimental Sectionmentioning

confidence: 99%

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Saenko

Yan

Shamsutdinov

et al. 2020

ACS Appl. Nano Mater.

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This paper describes a fire and explosion suppression formulation with increased flowability that ensures fast operation and high efficiency of an active explosion suppression system (complete fire and explosion suppression time = 2.25 ms; spraying capacity = over 98%). For the first time, the possibility of using mesoporous materials of different structures with high specific surface area as flow additives for these formulations has been reported. This also covers the results of an experimental study on the influence of various mesoporous silica materials used as additives on the rheological characteristics of a monoammonium phosphate (MAP)-based fire and explosion suppressant. Particular attention is paid to analysis of the results of the experiments in which the mesoporous materials are protected from moisture via poly(methylhydrosiloxane) hydrophobic modification. The study of the rheology of powders indicates that the flow parameters depend on the surface characteristics of silica nanoparticles and their size and concentration. The incorporation of superhydrophobized silica into MAP leads to a decrease in the cohesion force and an increase in the flow function ff (composition contact angle > 163°). The amount of superhydrophobic silica also affects the autoadhesion forces between particles. It has been established that the minimum resistance of a fire and explosion suppression powder to the flow occurs when modified nanoparticles with SBA-15-type structure are used as additives. The efficiency of hydrophobized silica materials as additives increases greatly with a decrease in the size of their particle agglomerates. The joint use of SBA-15 and Aerosil 380 silicas makes it possible to improve the rheological properties of the fire and explosion suppression formulation and to significantly increase its flowability.

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Preparation and Properties of Iron Oxide Doped Mesoporous Silica Systems

Кондрашова

Shamsutdinov

Батуева

et al. 2019

J Inorg Organomet Polym

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Effect of organic-silane additives on textural–structural properties of mesoporous silicate materials

Cited by 15 publications

References 15 publications

Upconverting Nanoparticles Coated with Light-Breakable Mesoporous Silica for NIR-Triggered Release of Hydrophobic Molecules

Upconverting Nanoparticles Coated with Light-Breakable Mesoporous Silica for NIR-Triggered Release of Hydrophobic Molecules

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Preparation and Properties of Iron Oxide Doped Mesoporous Silica Systems

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