Thermal conductivity studies of a polyurea cross-linked silica aerogel-RTV 655 compound for cryogenic propellant tank applications in space

Sabri, Firouzeh; Marchetta, Jeffrey G.; Smith, Kevin

doi:10.1016/j.actaastro.2013.06.001

Cited by 26 publications

(12 citation statements)

References 13 publications

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“…PDMS is a clear and inert material often used for a wide variety of situations including optical, biomedical and aerospace applications [5,6,7,8]. A near term goal is to produce a flexible material which can be used for temperature measurement of an underlying surface to which it is attached.…”

Section: Introductionmentioning

confidence: 99%

Sensing with Phosphor-doped PDMS

Sabri

Lynch

Wilson

et al. 2014

IET &Amp; ISA 60th International Instrumentation Symposium 2014

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Thermometry with thermographic phosphors usually involves superficial application of a thin coating to the surface of interest. In contrast, the subject here concerns a thicker luminescent target consisting of a flexible phosphor-doped polymer, from the polydimethylsiloxane (PDMS) family. The purpose is to produce a flexible attachable/detachable material which can be used for temperature measurement of the underlying surface it contacts. PDMS samples loaded with 1, 5, 15, and 50% of the phosphor La 2 O 2 S:Eu were fabricated and tested. For all doping levels, detectable and useful fluorescence signals were readily attained for 365 and 405 nm incident excitation. The PDMS host appeared not to affect the spectral properties of the incorporated phosphor. Additional characterization of optical, thermal and mechanical properties (stress/ strain behavior and temperature dependent compression response) as a function of dopant concentration described here validate this as a temperature sensing material.

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Section: Introductionmentioning

confidence: 99%

Sensing with Phosphor-doped PDMS

Sabri

Lynch

Wilson

et al. 2014

IET &Amp; ISA 60th International Instrumentation Symposium 2014

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“…Milling in a planetary ball mill is the most frequently used method to get carbon aerogel powder, where the monolithic aerogel is placed in a container with balls made of, e.g., ceramic or steel [9,10]. The container of the planetary ball mill mechanically rotates on its axis and powders the material to fine powder through the pressure, friction, cutting, centrifugal, and shearing forces between balls, container walls and samples.…”

Section: Introductionmentioning

confidence: 99%

The effect of pulverization methods on the microstructure of stiff, ductile, and flexible carbon aerogels

et al. 2020

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Carbon aerogels find application in many fields. In most of the applications, they are used as powders and thus need to be pulverized. However, the pulverization could induce various changes in the microstructure of carbon aerogels. The extent of changes depends not only on the dominant forces of used technique, but also on the mechanical and structural properties of initial monolithic samples. In the present work, we discuss the influence of grinding, milling in shaker cryo-mill, and planetary ball mill on stiff, ductile and flexible carbon aerogels. Scanning electron microscopy and transmission electron microscopy images, gas sorption techniques, wide-angle X-ray scattering, and Raman spectroscopy show a strong dependency of the introduced energy amount while pulverization on the structure modification. Results show that stiff carbon aerogels do not undergo noticeable changes. In contrast, ductile carbon aerogels are very sensitive to friction forces. Soft and flexible carbon aerogels undergo drastic changes in the microstructure.

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“…To overcome these problems, improvement of the strength and thermal stability is necessary. Many efforts have focused on improvement of the mechanical properties of the silica aerogels by using structural reinforcement [5][6][7], fiber reinforcement [8][9][10], polymer cross-linking [11][12][13][14] or other chemical or physical means [15][16][17][18][19]. However, it is difficult to form the fiber-reinforced silica aerogel composites into complex shapes.…”

Section: Introductionmentioning

confidence: 99%