Silica and Silica-Based Materials for Biotechnology, Polymer Composites, and Environmental Protection

Zdarta, Jakub; Jesionowski, Teofil

doi:10.3390/ma15217703

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The discovery of silica-based nanostructured materials opened new perspectives for the development of new materials with organized structures containing heteroatoms [ 1 , 2 ]. Due to the high surface area and accessibility of their pore systems, these materials have been promising as acid catalysts in petrochemical processes [ 3 , 4 , 5 ], supports for heteropolyacids [ 6 , 7 , 8 ], liquid phase catalysis [ 9 , 10 , 11 ], and in advanced materials technology [ 12 , 13 , 14 , 15 , 16 , 17 ]. Due to the great interest in these materials, it is necessary to develop new methodologies for synthesis, post-synthesis treatments, in addition to new characterization methods.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO2 (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)

et al. 2023

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The nanostructured lanthanide-silica materials of the Ln–SiO2 type (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) were synthesized by the hydrothermal method at 100 °C, using cetyltrimethylammonium as a structural template, silica gel and sodium silicate as a source of silicon, and lanthanide oxides, with Si/Ln molar ratio = 50. The resulting materials were calcined at 500 °C using nitrogen and air, and characterized by X-ray diffraction (XRD), Fourier-Transform infrared absorption spectroscopy, scanning electron microscopy, thermogravimetry (TG), surface area by the BET method and acidity measurements by n-butylamine adsorption. The XRD and chemical analysis indicated that the SiO2 presented a hexagonal structure and the incorporation of lanthanides in the structure changes the properties of the Ln–SiO2 materials. The heavier the lanthanide element, the higher the Si/Ln ratio. The TG curves showed that the decomposition of the structural template occurs in the materials at temperatures below 500 °C. The samples showed variations in specific surface area, mean pore diameter and silica wall thickness, depending on the nature of the lanthanide. The incorporation of different lanthanides in the silica generated acid sites of varied strength. The hydrothermal stability of the Ln–SiO2 materials evaluated at high temperatures, evidenced that the properties can be controlled for application in adsorption and catalysis processes.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO2 (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)

et al. 2023

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“…Fused silica [ 8 , 9 , 10 , 11 ] was a common candidate for ceramic cores, by virtue of its low thermal expansion coefficient (0.55 × 10 −6 /K between 25 °C and 1000 °C), low sintering temperatures, chemical stability against superalloy liquids and superior leachability in aqueous alkali; it was reported that 90% of the present ceramic cores were silica-based [ 1 ]. However, the resistance to high-temperature deformation required improvement, due to the low viscosity of silica glass at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property

Niu

Wang

et al. 2023

Materials

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Silica-based ceramic cores play key roles in the casting of aeroengine blades, but they are highly limited by the poor high-temperature mechanical property. Here, fused mullite (FM) and sintered mullite (SM) powders were modified in silica-based ceramic cores, and the microstructure evolution and crystallization kinetics of ceramic cores depending on mullite types were studied. The ceramic cores with FM showed a dense microstructure and superior mechanical properties compared to those with SM. The ceramic cores with 10 wt.% of FM showed a crystallization activation energy of 1119.5 kJ/mol and a crystallization exponent of 1.74, and the values of 938.4 kJ/mol and 1.86 as SM were employed; the decreased crystallization activation energy and the elevated crystallization exponent by SM suggested that the excess impurities of alkali oxides and alkaline-earth oxides significantly promoted the crystallization of cristobalite. Even though the ceramic cores with mullite powders decreased slightly in the room-temperature mechanical property, their high-temperature flexure strength and creep deformation resistance were enhanced. The ceramic cores with 10 wt.% of FM showed excellent comprehensive performance, with linear shrinkage of 0.69%, room-temperature strength of 18.9 MPa, and high-temperature strength of 15.5 MPa, which satisfied the demands for hollow-blade casting.

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Isopropyl myristate oil-based pickering emulsions stabilized by N-[3-(trimethoxysilyl)propyl]ethylenediamine-modified biosilica nanoparticles from rice husk

Olusanya,

Ajayi,

Olumayede

et al. 2023

Biomass Conv. Bioref.

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Silica and Silica-Based Materials for Biotechnology, Polymer Composites, and Environmental Protection

Abstract: Over recent years, silica and silica-based materials have become some of the most frequently used materials worldwide [...]

Cited by 4 publications

References 7 publications

Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO2 (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)

Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO2 (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)

Microstructure and Crystallization Kinetics of Silica-Based Ceramic Cores with Enhanced High-Temperature Property

Isopropyl myristate oil-based pickering emulsions stabilized by N-[3-(trimethoxysilyl)propyl]ethylenediamine-modified biosilica nanoparticles from rice husk

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