Synthesis of Silica Aerogel by Supercritical Drying Method

Błaszczyński, Tomasz; Ślosarczyk, Agnieszka; Morawski, Maciej

doi:10.1016/j.proeng.2013.04.028

Cited by 94 publications

(46 citation statements)

References 10 publications

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“…modification of the surface of aerogels and their composites with carbon microfibers was conducted in the solution of TMCS (chlorotrimethylsilane)/n-hexane with the volumetric ratio of 1:5 in the temperature of 50°C for 48 h. The supercritical drying in CO 2 was conducted in the research stand built in Institute of Structural Engineering at Poznan University of Technology, according to the procedure described in the article [5]. Carbon microfibers from carbon pitch of 700 lm length and 13 lm diameter in the amount of 15 wt% of silica aerogel mass were used as reinforcement.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterisation of silica aerogel/carbon microfibers nanocomposites dried in supercritical and ambient pressure conditions

Ślosarczyk

Barełkowski

Niemier

et al. 2015

J Sol-Gel Sci Technol

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Experimental results on the physical and chemical properties of silica aerogel and its composites with carbon microfibers are reported. The aerogels and silica aerogel/carbon microfibers nanocomposites were prepared via the sol-gel process of organosilicon compound followed by successive washing and drying in different conditions. Part of nanomaterials was surface modified in TMCS/n-hexane mixture in 50°C and dried in ambient pressure. Simultaneously, the supercritical drying of aerogels and its nanocomposites in CO 2 atmosphere was carried out. The carbon microfibers before usage in silica aerogel composites were chemically treated in nitric acid. The physical properties of silica aerogels were studied by measuring the bulk density, volume shrinkage, porosity, pore volume and thermal conductivity. In the case of pure aerogels dried via supercritical conditions, the structure presented much less contraction during drying and was more resistant to higher temperature. However, the properties of silica aerogels composites with carbon microfibers drying in ambient pressure were better than corresponding composites subjected to supercritical drying. It was shown that simultaneous oxidation of carbon fibres and chemical modification of silica aerogel in TMCS/n-hexane mixture contributed to the stable mesoporous structure of composite with very good physical properties, especially lower shrinkage.& Agnieszka Ś losarczyk agnieszka.slosarczyk@put.poznan.pl

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Section: Methodsmentioning

confidence: 99%

Synthesis and characterisation of silica aerogel/carbon microfibers nanocomposites dried in supercritical and ambient pressure conditions

Ślosarczyk

Barełkowski

Niemier

et al. 2015

J Sol-Gel Sci Technol

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“…Recent studies on SFT have shown that this technology can be also utilized for chemical and biochemical processes (Ikushima, 1997;Jessop and Leitner, 2008;Santos et al, 2016), synthesis of new materials such as silica aerogel (Błaszczyński et al, 2013;Mahadik et al, 2016), a powerful tool for chiral separations (Speybrouck and Lipka, 2016), optimization of graphene production by exfoliation of graphite (Hadi et al, 2016), dry cleaning (McHardy and Sawan, 1998), high-pressure sterilization (Perrut, 2012), jet cutting (Shen et al, 2011), thin-film deposition for microelectronics (Jianzhong et al, 2009), and separation of value-added products from fermentation broths in the field of biotechnology (Fabre et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Study of Solubility in Supercritical Fluids: Thermodynamic Concepts and Measurement Methods - A Review

Rad

Karimi-Sabet

Varaminian

2019

Braz. J. Chem. Eng.

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Due to the importance of supercritical fluid technology (SFT) in different industries, it has been the subject of intense research in recent decades. Solubility is a key concept in SFT. In fact, obtaining knowledge about the theoretical concepts of solubility and related experimental measurement methods can be useful in developing and improving the quality of research in this field. This study reviews the fundamental knowledge of solubility in supercritical fluids and investigates the significant topics in this field, including high-pressure phase behavior, experimental measurement methods, modeling, and molecular simulation of solubility.

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“…Silica aerogels have a promising potential in the building and construction sector as thermal insulation materials due to their low thermal conductivity [1], where their nanoscale silica network can be produced in a sol-gel process [2], and thus silica aerogels attain a relatively low thermal conductivity [3], numerous 50-60 nm air voids impede gaseous thermal conductivity [4], and the three-dimensional silica network makes thermal conductance ineffective, that is, a tortuous silica network has enough networkpath endpoints to impede heat transport [5]. Such nanoscale structures are, to some extent, transparent to thermal radiation [6].…”

Section: Introductionmentioning

confidence: 99%