Starch aerogels were prepared via dissolution in water (thermomechanical treatment), retrogradation, solvent exchange, and drying with supercritical CO₂. Amylose content in starches was varied from 0 to 100%. The aerogels’ bulk density, morphology, specific surface area, thermal conductivity, and mechanical properties under compression were investigated. Pea starch aerogels had one of the highest specific surface area and lowest density and thermal conductivity (0.021–0.023 W/m·K), with the latter indicating that a new thermal superinsulation material was obtained. A detailed study of the influence of processing parameters on pea starch aerogels properties showed the importance of retrogradation time which decreases specific surface area and increases mechanical properties and thermal conductivity. Finally, a comparison of starch aerogel thermal conductivity with that of other bioaerogels is performed.

中文翻译：

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淀粉气凝胶：超级隔热材料家族的成员

淀粉气凝胶是通过溶于水（热机械处理），回生，溶剂交换以及用超临界CO ₂干燥制备的。淀粉中的直链淀粉含量从0到100％不等。研究了气凝胶的堆积密度，形态，比表面积，热导率和压缩状态下的机械性能。豌豆淀粉气凝胶具有最高的比表面积和最低的密度和热导率（0.021-0.023 W / m·K）之一，后者表明获得了一种新型的超绝热材料。对加工参数对豌豆淀粉气凝胶性能的影响进行的详细研究表明，凝结时间的重要性在于凝结时间的减少，这会降低比表面积并增加机械性能和导热性。最后，将淀粉气凝胶的热导率与其他生物气凝胶的热导率进行比较。