Preparation of monolithic silica-based aerogels with high thermal stability by ambient pressure drying

Ji, Xiaofei; Zhou, Qian; Qiu, Guibo; Yue, Changsheng; Guo, Min; Chen, Fangqin; Zhang, Mei

doi:10.1016/j.ceramint.2018.03.261

Cited by 33 publications

(5 citation statements)

References 31 publications

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“…The dramatic increase in the apparent density from the PSAM to the HSAM and RSAM demonstrates that plenty of Si-CH 3 and polyurea species are grafted on the HSAM and RSAM, respectively. The SEM images demonstrate that the PSAM and HSAM showed a nanoporous network constructed by colloidal particles and nanopores, which is the same as the typical silica aerogels [ 3 , 44 , 45 ]. The graft of the Si-CH 3 species leads to the decrease in large voids, and the microscopic morphology of the HSAM is similar with the reported hydrophobic silica aerogels [ 9 , 11 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 78%

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Sun

Zhao

Kong

et al. 2022

Gels

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An efficient auto-continuous globing process was developed with a self-built apparatus to synthesize pure silica aerogel microspheres (PSAMs) using sodium silicate as a precursor and water as a solvent. A hydrophobic silica aerogel microsphere (HSAM) was obtained by methyl grafting. A reinforced silica aerogel microsphere (RSAM) was prepared by polymer cross-linking on the framework of the silica gel. The pH value of the reaction system and the temperature of the coagulating bath were critical to form perfect SAMs with a diameter of 3.0 ± 0.2 mm. The grafted methyl groups are thermally stable up to 400 °C. Polymer cross-linking increased the strength significantly, owing to the polymer coating on the framework of silica aerogel. The pore volumes of HSAM (6.44 cm3/g) and RSAM (3.17 cm3/g) were much higher than their state-of-the-art counterparts. Their specific surface areas were also at a high level. The HSAM and RSAM showed high organic sorption capacities, i.e., 17.9 g/g of pump oil, 11.8 g/g of hexane, and 22.2 mg/g of 10 mg/L methyl orange. The novel preparation method was facile, cost-effective, safe, and eco-friendly, and the resulting SAM sorbents were exceptional in capacity, dynamics, regenerability, and stability.

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Section: Resultsmentioning

confidence: 78%

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Sun

Zhao

Kong

et al. 2022

Gels

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“…Ji et al. [ 30 ] prepared a Al 2 O 3 –SiO 2 ‐based aerogel by using Al(H 2 O) 9 (NO 3 ) 3 and TEOS as precursors. The densification of the constituent particles leading to viscous sintering and pore collapse is prevented by the introduction of Al 2 O 3 .…”

Section: Thermal Properties and Applicationsmentioning

confidence: 99%

“…Among all inorganic aerogels, aluminasilica-based aerogels with excellent insulating properties are considered to be suitable substitutes for aerospace applications. Ji et al [30] prepared a Al 2 O 3 -SiO 2 -based aerogel by using Al(H 2 O) 9 (NO 3 ) 3 and TEOS as precursors. The densification of the constituent particles leading to viscous sintering and pore collapse is prevented by the introduction of Al 2 O 3 .…”

Section: Applications Of Inorganic Nanoparticles-based Aerogelsmentioning

confidence: 99%

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

et al. 2021

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Aerogel is a nanoporous solid material with ultrahigh porosity, ultralow density, and thermal conductivity, which is considered to be one of the most promising high‐performance insulation materials today. However, traditional pure inorganic aerogels (i.e., silica aerogel) exhibit inherent structural brittleness, making their processing and handling difficult, and their manufacturing costs are relatively high, which limits their large‐scale practical use. The recently developed aerogel based on polymer nanofibers has ultralow thermal conductivity and density, excellent elasticity, and designable multifunction. More importantly, one‐dimensional polymer nanofibers are directly used as building blocks to construct the network of aerogels via a gelation‐free process. This greatly simplifies the aerogel preparation process, thereby bringing opportunities for large‐scale aerogel applications. The aggregation of inorganic nanomaterials and polymer nanofibers is considered to be a very attractive strategy for obtaining highly flexible, easily available, and multifunctional composite aerogels. Therefore, this review summarizes the recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation. The main processing routes, porous microstructure, mechanical properties, and thermal properties and applications of these aerogels are highlighted. In addition, various future challenges faced by these aerogels in thermal insulation applications are discussed in this review.

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“…Initially, aerogels primarily comprised silica [2], [3], yet Kistler broadened the spectrum by introducing various other types, including mineral aerogels like aluminum oxide and tungsten, along with organic variants such as cellulose, gelatin, and rubber. However, the production processes for these aerogels [4], [5], [6], [7], [8], [9], [10], [11] demanded considerable labor and time.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Thermal Conductivity And Fire Resistance Of Polycotton Via Silica And Titanate Xerogel Coatings: A Comparative Study

ASSAL,

WAZNA,

BOUCHTI

et al. 2024

Preprint

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Titanate and silicate xerogels have garnered considerable attention in the realm of thermal insulation due to their outstanding attributes, encompassing thermal conductivity and fire resistance. This study focused on pioneering a new multifunctional textile by integrating xerogels—both titanate and silicate—as additives for enhancing polycotton fabric. Microstructural analyses involved SEM observations, while diverse chemical bonds were identified through iTR-IR technique. Evaluation of thermal properties encompassed TGA, DSC, and thermal conductivity measurements. Findings reveal that the treated fabrics exhibit exceptional flame resistance, they do not burn and therefore exhibit good fire resistance compared to untreated polycotton. Additionally, the multifunctional fabric showcases enhanced thermal stability compared to its untreated counterpart. Consequently, the application of titanate and silicate xerogel coatings yields a versatile textile with substantial potential for smart clothing and personal heating applications.

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Preparation of monolithic silica-based aerogels with high thermal stability by ambient pressure drying

Cited by 33 publications

References 31 publications

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

Enhancing Thermal Conductivity And Fire Resistance Of Polycotton Via Silica And Titanate Xerogel Coatings: A Comparative Study

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