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Abstract
Fiber-loaded aerogel composites possess remarkable physical and chemical properties, making them extensively used in a variety of science and technology fields. Structural changes were usually taken place inside the aerogel composites under an elevated thermal environment. However, scarce research can be found on the resulted optical properties degradation provoked by thermal exposures, possibly due to technical limitations in the characterization method of aerogel composites. With this motivation, the thermally-induced microstructural changes in fiber-loaded aerogel composites were firstly characterized and discussed in this work by in-situ characterization techniques. For comparison of optical properties of samples under various levels of thermal exposures, an inverse measurement method was developed to characterize intrinsic optical properties of samples based on the measured and predicted normal-hemispherical transmittance and reflectance spectra. The intrinsic optical properties evolution was then correlated with the microstructural developments caused by high-temperature annealings for the samples. The provided information is indispensable for promoting fundamental insights on the underlying physical mechanisms of aerogel composites and provide guidelines for further design and optimization under thermal environments.
Published Version
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