Facile synthesis of silica aerogel composites via ambient-pressure drying without surface modification or solvent exchange

Du, Dongxuan; Feng, Jian; Feng, Junzong; Li, Liangjun

doi:10.1016/j.vacuum.2019.109117

Cited by 29 publications

(15 citation statements)

References 24 publications

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“…This method is widely used to produce nanoparticles in powder form [28][29][30]. Similarly, the sol-gel method is a well known technique used widely to synthesize silica and silica gel [31,32]. It mainly involves the hydrolysis and condensation of metal alkoxides like TEOS or inorganic salts like sodium silicate in the presence of a catalyst.…”

Section: Synthesis Of Snps (Chemical Methods)mentioning

confidence: 99%

A Comprehensive Review of Synthesis, Applications and Future Prospects for Silica Nanoparticles (SNPs)

Akhter

Rao

Abbasi

et al. 2022

Silicon

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Silica nanoparticles (SNPs) have shown great applicability potential in a number of fields like chemical, biomedical, biotechnology, agriculture, environmental remediation and even wastewater purification. With remarkably instinctive properties like mesoporous structure, high surface area, tunable pore size/diameter, biocompatibility, modifiability and polymeric hybridizability, the SNPs are growing in their applicable potential even further. These particles are shown to be non-toxic in nature, hence safe to be used in biomedical research. Moreover, the molecular mobilizability onto the internal and external surface of the particles makes them excellent carriers for biotic and non-biotic compounds. In this respect, the present study comprehensively reviews the most important and recent applications of SNPs in a number of fields along with synthetic approaches. Moreover, despite versatile contributions, the applicable potential of SNPs is still a tip of the iceberg waiting to be exploited more, hence, the last section of the review presents the future prospects containing only few of the many gaps/research extensions regarding SNPs that need to be addressed in future work.

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Section: Synthesis Of Snps (Chemical Methods)mentioning

confidence: 99%

A Comprehensive Review of Synthesis, Applications and Future Prospects for Silica Nanoparticles (SNPs)

Akhter

Rao

Abbasi

et al. 2022

Silicon

View full text Add to dashboard Cite

show abstract

“…In this method, the physical features of the NPs, such as shape and particle size, can be adjusted to achieve the desired results. Similarly, the sol-gel technique is a well-known approach for producing Si and Si gel (Du et al, 2020;Sriwuryandari et al, 2020). In the presence of a catalyst, it mainly includes the hydrolysis and condensation of metal alkoxides such as TEOS (Tetraethyl orthosilicate) or inorganic salts such as sodium silicate.…”

Section: Chemical Synthesis Of Sinpsmentioning

confidence: 99%

Silica nanoparticles as novel sustainable approach for plant growth and crop protection

Goswami

Mathur

2022

Heliyon

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“…The reason is that under the same volume condition, with the increase of fiber density, the proportion of high-strength aerogel matrix in the composite material decreased, which made it unable to provide a strong support for the composite material. The comprehensive performance of SAC was best at a fiber density of 0.24 g/cm 3 , and its compressive strength at 10% strain was 1.348 MPa, which was 1146% higher than that of the same type of aerogel insulation composite [ 20 ]. Strong aerogels and toughened fibers play an important role in the preparation of regular-shaped and high-strength aerogel composites.…”

Section: Resultsmentioning

confidence: 99%

“…Since then, researchers have prepared silica aerogels using methyltrimethoxysilane (MTMS) as a precursor by APD without solvent replacement [ 11 , 12 , 13 , 14 , 15 , 16 ], but aerogels have poor mechanical properties and are prone to brittle fracture during use [ 17 , 18 , 19 ]. Our research group [ 20 ] used MTMS as the precursor and mullite fiber as the reinforcing phase to prepare an aerogel insulation composite material in the early stage, which has a low thermal conductivity (0.0403 W/m·K at room temperature and 0.101 W/m·K at 1100 °C), but its strength is not strong enough to resist external vibration and compression during use (0.108 MPa at 10% strain). In addition, flammable and explosive ethanol is used in the preparation process, which is dangerous and not friendly to the environment.…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of High Strength Silica Aerogel Composites via a Water Solvent System and Ambient Pressure Drying without Surface Modification or Solvent Replacement

Liu

Jiang

et al. 2021

Materials

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To further reduce the manufacturing cost and improve safety, silica aerogel composites (SAC) with low density and low thermal conductivity synthesized via ambient pressure drying (APD) technology have gradually become one of the most focused research areas. As a solvent, ethanol is flammable and needs to be replaced by other low surface tension solvents, which is dangerous and time-consuming. Therefore, the key steps of solvent replacement and surface modification in the APD process need to be simplified. Here, we demonstrate a facile strategy for preparing high strength mullite fiber reinforced SAC, which is synthesized by APD using water as a solvent, rather than using surface modification or solvent replacement. The effects of the fiber density on the physical properties, mechanical properties, and thermal conductivities of SAC are discussed in detail. The results show that when the fiber density of SAC is 0.24 g/cm3, the thermal conductivity at 1100 °C is 0.127 W/m·K, and the compressive strength at 10% strain is 1.348 MPa. Because of the simple synthesis process and excellent thermal-mechanical performance, the SAC is expected to be used as an efficient and economical insulation material.

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Facile synthesis of silica aerogel composites via ambient-pressure drying without surface modification or solvent exchange

Cited by 29 publications

References 24 publications

A Comprehensive Review of Synthesis, Applications and Future Prospects for Silica Nanoparticles (SNPs)

A Comprehensive Review of Synthesis, Applications and Future Prospects for Silica Nanoparticles (SNPs)

Silica nanoparticles as novel sustainable approach for plant growth and crop protection

Facile Preparation of High Strength Silica Aerogel Composites via a Water Solvent System and Ambient Pressure Drying without Surface Modification or Solvent Replacement

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