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An important and time consuming step in aerogel production is supercritical drying. Improved understanding of the process is necessary to accelerate aerogel production and thus make aerogels more economically feasible and their use more widespread. A model has been formulated which analyzes transport of supercritical carbon dioxide and ethanol within a single pore of silica aerogel during drying ... read moreand shows that drying is a diffusion dependent process. Furthermore, this model elucidates the importance of accurately determining the binary diffusion coefficient in the ethanol-CO2 system, specifically its dependence on system composition. A second model analyzes drying in a sheet of aerogel as CO2 flows through a narrow gap adjacent to it. This model quantified the importance of ethanol buildup in the narrow gap on the transient drying process, which was shown to be negligible in the parametric range examined.read less
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