Evaluations of Silica Aerogel-Based Flexible Blanket as Passive Thermal Control Element for Spacecraft Applications

Hasan, Mohammed Adnan; Rashmi, S. H.; Akinlabi, Esther T.; Bhavanisankar, Prudhivi Yashwantkumar; Sherikar, Baburao N.; Sridhara, N.; Dey, Arjun

doi:10.1007/s11665-018-3232-y

Cited by 29 publications

(17 citation statements)

References 24 publications

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“…Here, some reaction might take place. Hasan et al [30] presented combined measurements on aerogel samples, including calorimetry tests. They showed a critical region between 130-260 °C.…”

Section: Scanning Electron Microscope Resultsmentioning

confidence: 99%

“…The results are presented From Figure 6, it is visible that the specific heat capacity at room temperature is about 1000 J/(kg•K), while it is constant almost between 70-120 • C. After this, a continuously increasing part is visible, while a great change is observable above 240 • C. Here, some reaction might take place. Hasan et al [30] presented combined measurements on aerogel samples, including calorimetry tests. They showed a critical region between 130-260 • C.…”

Section: Results Of Xrd Measurementsmentioning

confidence: 99%

“…Moreover, besides these investigations, tests with an X-ray diffractometer (XRD) should be carried out. Several papers [28,29] present the XRD measurements of the aerogels after annealing at elevated temperatures, which are usually over 500 • C. Also, differential scanning calorimetry (DSC) investigations combined with scanning electron microscopy as well as with sorption measurements were executed on aerogels [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

et al. 2019

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Nowadays, besides the use of conventional insulations (plastic foams and wool materials), aerogels are one of the most promising thermal insulation materials. As one of the lightest solid materials available today, aerogels are manufactured through the combination of a polymer with a solvent, forming a gel. For buildings, the fiber-reinforced types are mainly used. In this paper, the changes both in the thermal performance and the material structure of the aerogel blanket are followed after thermal annealing. The samples are put under isothermal heat treatments at 70 °C for weeks, as well as at higher temperatures (up to 210 °C) for one day. The changes in the sorption properties that result from the annealing are presented. Furthermore, the changes in the thermal conductivity are followed by a Holometrix Lambda heat flow meter. The changes in the structure and surface of the material due to the heat treatment are investigated by X-ray diffraction and with scanning electron microscopy. Besides, the above-mentioned measurement results of differential scanning calorimetry experiments are also presented. As a result of using equipment from different laboratories that support each other, we found that the samples go through structural changes after undergoing thermal annealing. We manifested that the aerogel granules separate down from the glass fibers and grow up. This phenomenon might be responsible for the change in the thermal conductivity of the samples.

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“…Here, some reaction might take place. Hasan et al [30] presented combined measurements on aerogel samples, including calorimetry tests. They showed a critical region between 130-260 °C.…”

Section: Scanning Electron Microscope Resultsmentioning

confidence: 99%

Section: Results Of Xrd Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

et al. 2019

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“…Other authors presented important information from heat-treated samples by using differential scanning calorimetry (DSC). Moreover, the application of optical microscope and executing humidity test in a climatic chamber is also necessary to know the physical behavior of the samples [19][20][21][22]. The tested aerogel material contains not only silica, but different organic groups as methyl, OH and carbon.…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal annealing on structural properties of silica aerogel super insulation material

Lakatos

Csarnovics

2019

J Therm Anal Calorim

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Nowadays, aerogel materials are some of the lightest thermal insulation materials available on the construction market; they are produced by the mixing of polymers with solvents since they create a gel. Insulated fibrous-enhanced forms are the most frequently used ones. The type, which is used for thermal insulation, is usually produced by mixing the glass fiber net with the liquid-solid solution. The present paper talks about the structural modifications caused by heat treatment of the aerogel-reinforced with fiberglass. The aerogel probes were subjected to thermal annealing, and once they got isothermal heat treatments for weeks at 70 °C, moreover, untreated samples were subjected to stepwise thermal treatments between 100 and 250 °C for 1 day. Both the heat treatments were executed in dryer equipment under atmospheric air. Changes both in the structure and in chemical bonds of the untreated and annealed samples were followed. Raman spectra have been obtained for the samples. The structural changes have an influence on the studied material as well as in thermal properties. The structural and thermal properties were put under investigation after executing heat treatments on them. Jumps in the thermal conductivity could be connected with some structural changes. Due to the annealing intensity of the peaks connected with Si-O, crystalline SiO is increased, while CH, CH2, CH3,-OH and others are decreased.

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“…This requires the thermal control system to have accurate heating capacity. For the thermal control system, the heating loop of several tens or even hundreds of loops must be performed [4,5]. A series of temperature-controlled, program-controlled power supplies are required for control.…”

Section: Methodsmentioning

confidence: 99%

The Research of Integrated-Programmable Power Control of Thermal Vacuum Test for Sustainable Energy Development

Feng¹,

Wang²,

Liao³

et al. 2018

Proceedings of the 2018 International Symposium on Communication Engineering &Amp; Computer Science (CECS 2018)

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There hasn't been a quick and easy way to physically connect outdated test instruments to your computer, most engineers need to program and control test instruments and communicate with them from a PC or laptop, It wound wasted a lot of time and effort getting your instruments hooked up, dealing with driver issues and writing code. Thermal vacuum test and thermal balance test are required in the development process of aerospace equipment, the integrated technology of thermal vacuum test and thermal balance test can more reasonably organize the thermal test process and further improve the development efficiency, in order to study the achievable integration of thermal test technology. the internal connection between two kinds of thermal tests was analyzed, and a test method of using one thermal boundary temperature control simulation device to complete two thermal tests in a test was proposed. Based on this, a simulation example of the integration of a program-controlled power supply for a project was used to verify the correctness of the integrated technology, that can simplify outdated test instruments connection, communication, and programming tasks.

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Evaluations of Silica Aerogel-Based Flexible Blanket as Passive Thermal Control Element for Spacecraft Applications

Cited by 29 publications

References 24 publications

Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

Effects of the Heat Treatment in the Properties of Fibrous Aerogel Thermal Insulation

Influence of thermal annealing on structural properties of silica aerogel super insulation material

The Research of Integrated-Programmable Power Control of Thermal Vacuum Test for Sustainable Energy Development

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