Application of Silica Aerogel in Composites Protecting Against Thermal Radiation

Krzemińska, Sylwia; Cieślak, Małgorzata; Kamińska, Irena; Nejman, Alicja

doi:10.2478/aut-2020-0008

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…So it is a simpler way to apply aerogel. Similar findings were reported in our previous studies [53] concerning a textile-polymer composite produced by coating a meta-aramid fabric with a granular aerogel dispersion. The RHTI24 increased by approx.…”

Section: Aerogel Effects On Thermal Radiationsupporting

confidence: 92%

“…Jin et al [12] pointed to some problems with material homogeneity, with the main difficulty being the use of acetone as a solvent in the process of nonwoven impregnation with an aerogel dispersion. A similar problem was noted by Krzemińska et al [53] for a meta-aramid fabric coated with a latex dispersion with aerogel (100-700 μm particle size) as aerogel particles tended to be crushed in the process of coating. As a result, the obtained improvement of thermal resistance properties may be lower than expected.…”

Section: Aerogel Effects On Convective Heat Resistancesupporting

confidence: 67%

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Characterization of Heat Protective Aerogel-Enhanced Textile Packages

Krzemińska¹,

Greszta²,

Miśkiewicz³

2020

IJHT

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The aim of this study was to investigate the effects of aerogel application on the thermal properties of textile packages intended for use in protective clothing. The packages were prepared in the form of removable inserts filled with aerogel, differing in terms of fabric and design. The developed packages were tested for resistance to the three major types of heat: radiant, convective, and contact. The package variant with superior thermal performance was also evaluated for water vapor resistance. The package after incorporation of aerogel was found to approximately double radiant and convective heat resistance, with an approx. eightfold improvement for contact heat at the highest test temperature 250℃. Threshold time increased from (17.7±0.7) s to (139.9±4.9) s for the optimum aerogel-enhanced package variant with the greatest number of pouches, which met the criteria of the highest performance level. The thermal conductivity and thermal resistance of three fabrics selected for testing were tested in order to determine their basic thermal insulation properties. In general, packages containing a larger number of narrower pouches exhibited higher thermal protective performance. The results show that the developed textile packages with aerogel can be successfully used in thermal protective clothing.

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Section: Aerogel Effects On Thermal Radiationsupporting

confidence: 92%

Section: Aerogel Effects On Convective Heat Resistancesupporting

confidence: 67%

Characterization of Heat Protective Aerogel-Enhanced Textile Packages

Krzemińska¹,

Greszta²,

Miśkiewicz³

2020

IJHT

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“…It has therefore been found that the lamination of aerogel composites is an effective solution to prevent the spread of the aerogel to the environment. The problem with aerogel crushing was also noticed by Krzemińska et al [ 59 ], who were coating fabric with a polymer dispersion with the addition of silica aerogel in the form of granules. Based on the SEM micrographs, the authors noted an approximate 50-fold reduction in the size of the aerogel particles as a result of applying a coating containing 6% aerogel to the fabric.…”

Section: Resultsmentioning

confidence: 80%

Multilayer Nonwoven Inserts with Aerogel/PCMs for the Improvement of Thermophysiological Comfort in Protective Clothing against the Cold

et al. 2022

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This study aimed to assess the developed nonwoven inserts with aerogel/PCM (phase change material) microcapsules for use in protective clothing against cold in terms of properties related to thermophysiological comfort. These inserts were obtained by the thermal bonding of a multilayer system consisting of needled-punched nonwovens and silica aerogel particles and/or PCM microcapsules evenly distributed between them. The influence of aerogel and PCM microcapsules on the basic physical properties of inserts, their microstructure, air permeability, and water vapor resistance was investigated and analyzed. The thermal insulation properties of inserts were assessed based on thermal conductivity results. The inserts with PCMs were also tested for their ability to regulate the temperature in the undergarment microclimate using the differential scanning calorimeter (DSC) and the “skin model” device. The research showed that the use of aerogel allowed for reducing the thermal conductivity of the insert by approximately 13% compared to the insert without additives. The high values obtained of the melting and crystallization enthalpy of inserts with PCMs confirmed their high efficiency in the heat absorption and release. Thus, the use of aerogel and PCMs in protective clothing against cold seems to be an effective solution for improving its protective properties and actively adapting its thermal insulation to the changing temperature conditions and the activity level of employees.

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“…The most commonly used solution, especially in the protective clothing protecting against extremely low temperatures, is that of nonwoven composites consisting of a silica aerogel matrix and a reinforcing material, which is a nonwoven fabric [20]. The…”

Section: Introductionmentioning

confidence: 99%

Application of Coating Mixture Based on Silica Aerogel to Improve Thermal Protective Performance of Fabrics

Miśkiewicz

Tokarska

Frydrych

2022

AUTEX Research Journal

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The main aim of this research is to improve the protective thermal performance of fabrics. Flame-resistant fabrics characterizing comparable thermal properties were chosen, cotton fabric with a flame-retardant finish and Nomex® fabric. To improve thermal parameters the coating mixture, based on silica aerogel, was applied on one side of the sample surface. Parameters such as the thermal conductivity, resistance to contact, and radiant heat were determined based on the standards, which set high expectations for the protective clothing. Analysis of the coated fabrics surfaces was conducted based on confocal microscopy. It was found that the coating mixture caused a decrease in thermal conductivity. All the modified fabrics reached 1st efficiency level of protection against contact and radiant heat. The best sample from the point of view of protection against contact and radiant heat was modified cotton fabric with a flame-retardant finish. The coating mixture contained 45 wt% of silica aerogel. Moreover, better adhesion of the coating mixture to the cotton fabric compared with Nomex® fabric was observed.

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Application of Silica Aerogel in Composites Protecting Against Thermal Radiation

Cited by 8 publications

References 30 publications

Characterization of Heat Protective Aerogel-Enhanced Textile Packages

Characterization of Heat Protective Aerogel-Enhanced Textile Packages

Multilayer Nonwoven Inserts with Aerogel/PCMs for the Improvement of Thermophysiological Comfort in Protective Clothing against the Cold

Application of Coating Mixture Based on Silica Aerogel to Improve Thermal Protective Performance of Fabrics

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