An Updated Overview of Silica Aerogel-Based Nanomaterials

Niculescu, Adelina-Gabriela; Tudorache, Dana-Ionela; Bocioagă, Maria; Mihaiescu, Dan Eduard; Hadibarata, Tony; Grumezescu, Alexandru Mihai

doi:10.3390/nano14050469

Cited by 4 publications

(2 citation statements)

References 165 publications

(287 reference statements)

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“…The conventional process for synthesizing aerogels involves five steps: sol-gel, solvent exchange, aging, supercritical drying, and heat treatment [27,28]. The BaTiO 3 nanoparticles (BTO NPs) were synthesized utilizing the aforementioned procedure.…”

Section: Resultsmentioning

confidence: 99%

Ag Nanoparticles Deposited onto BaTiO3 Aerogel for Highly Efficient Photodegradation

Wu,

Yan,

Xie

et al. 2024

Gels

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Given the increasingly severe environmental problems caused by water pollution, the degradation of organic dyes can be effectively achieved through the utilization of photocatalysis. In this work, metal alkoxides and a combination of alcohol/hydrophobic solvents are employed to prepare BaTiO3 aerogels via a liquid-phase and template-free synthetic route. The preparation process of the aerogels solely entails facile agitation and supercritical drying, eliminating the need for additional heat treatment. The binary solvent of ethanol and toluene is identified as the optimal choice, resulting in a significantly enhanced surface area (up to 223 m2/g) and an abundant pore structure of BaTiO3 aerogels compared to that of the BaTiO3 nanoparticles. Thus, the removal efficiency of the BaTiO3 aerogel sample for MO is nearly twice as high as that of the BaTiO3 nanoparticles sample. Noble metal Ag nanoparticles’ deposition onto the BaTiO3 aerogel surface is further achieved via the photochemical deposition method, which enhances the capture of photogenerated electrons, thereby ensuring an elevated level of photocatalytic efficiency. As a result, Ag nanoparticles deposited on BaTiO3 aerogel can degrade MO completely after 40 min of illumination, while the corresponding aerogel before modification can only remove 80% of MO after 60 min. The present work not only complements the preparatory investigation of intricate aerogels but also offers a fresh perspective for the development of diverse perovskite aerogels with broad applications.

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Section: Resultsmentioning

confidence: 99%

Ag Nanoparticles Deposited onto BaTiO3 Aerogel for Highly Efficient Photodegradation

Wu,

Yan,

Xie

et al. 2024

Gels

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“…Porous ceramics are frequently examined as thermal insulation materials due to their distinctive features, such as high porosity, low bulk density, low thermal conductivity, and exceptional resistance to high temperatures and corrosion [ 2 ]. Porous ceramics, such as SiO 2 [ 3 ], Al 2 O 3 [ 4 ], ZrO 2 [ 5 ], SiC [ 6 , 7 , 8 , 9 , 10 ], TiC [ 11 , 12 ], ZrC [ 13 , 14 , 15 ], and HfC [ 16 , 17 ], exhibit outstanding thermal insulation performances characterized by high melting points, excellent high-temperature stability, and robust mechanical properties, rendering them highly promising for high-temperature insulation applications.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical Property and Thermal Conductivity of Porous TiCO Ceramic Fabricated by In Situ Carbothermal Reduction of Phenolic Resin and Titania

Cao,

Wang,

et al. 2024

Nanomaterials

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The porous TiCO ceramic was synthesized through a one-step sintering method, utilizing phenolic resin, TiO2 powder, and KCl foaming agent as raw materials. Ni(NO3)2·6H2O was incorporated as a catalyst to facilitate the carbothermal reaction between the pyrolytic carbon and TiO2 powder. The influence of Ni(NO3)2·6H2O catalyst content (0, 5, 10 wt.% of the TiO2 powder) on the microstructure, compressive strength, and thermal conductivity of the resultant porous TiCO ceramic was examined. X-ray diffraction and X-ray photoelectron spectroscopy results confirmed the formation of TiC and TiO in all samples, with an increase in the peak of TiC and a decrease in that of TiO as the Ni(NO3)2·6H2O content increased from 0% to 10%. Scanning electron microscopy results demonstrated a morphological change in the pore wall, transforming from a honeycomb-like porous structure composed of well-dispersed carbon and TiC-TiO particles to rod-shaped TiC whiskers, interconnected with each other as the catalyst content increased from 0% to 10%. Mercury intrusion porosimetry results proved a dual modal pore-size distribution of the samples, comprising nano-scale pores and micro-scale pores. The micro-scale pore size of the samples minorly changed, while the nano-scale pore size escalated from 52 nm to 138 nm as the catalyst content increased from 0 to 10%. The morphology of the pore wall and nano-scale pore size primarily influenced the compressive strength and thermal conductivity of the samples by affecting the load-bearing capability and solid heat-transfer conduction path, respectively.

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Fabrication and Advanced Imaging Characterization of Magnetic Aerogel-Based Thin Films for Water Decontamination

Niculescu,

Mihaiescu,

Bîrcă

et al. 2024

Gels

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Aerogels have emerged as appealing materials for various applications due to their unique features, such as low density, high porosity, high surface area, and low thermal conductivity. Aiming to bring the advantages of these materials to the environmental field, this study focuses on synthesizing magnetic silica aerogel-based films suitable for water decontamination. In this respect, a novel microfluidic platform was created to obtain core-shell iron oxide nanoparticles that were further incorporated into gel-forming precursor solutions. Afterward, dip-coating deposition was utilized to create thin layers of silica-based gels, which were further processed by 15-hour gelation time, solvent transfer, and further CO2 desiccation. A series of physicochemical analyses (XRD, HR-MS FT-ICR, FT-IR, TEM, SEM, and EDS) were performed to characterize the final films and intermediate products. The proposed advanced imaging experimental model for film homogeneity and adsorption characteristics confirmed uniform aerogel film deposition, nanostructured surface, and ability to remove pesticides from contaminated water samples. Based on thorough investigations, it was concluded that the fabricated magnetic aerogel-based thin films are promising candidates for water decontamination and novel solid-phase extraction sample preparation.

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An Updated Overview of Silica Aerogel-Based Nanomaterials

Cited by 4 publications

References 165 publications

Ag Nanoparticles Deposited onto BaTiO3 Aerogel for Highly Efficient Photodegradation

Ag Nanoparticles Deposited onto BaTiO3 Aerogel for Highly Efficient Photodegradation

Microstructure, Mechanical Property and Thermal Conductivity of Porous TiCO Ceramic Fabricated by In Situ Carbothermal Reduction of Phenolic Resin and Titania

Fabrication and Advanced Imaging Characterization of Magnetic Aerogel-Based Thin Films for Water Decontamination

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