聚氨基甲酸乙酯(PU)泡沫目前不受欢迎,这不仅是由于它易燃烧,产生有毒的烟雾,而且还由于它含有消耗臭氧的含氯氟烃CFCs。作为热绝缘材料取而代之的一种办法是使用气溶胶,一种多孔的氧化物材料,其中的空隙至少占材料体积的99％。在已知的最轻材料中,这种气溶胶是通过在液体临界点之上热压处 Polyurethane foam is currently unpopular not only because it is flammable and produces toxic fumes, but also because it contains ozone-depleting CFCs. One way to replace it as a thermal insulating material is to use aerosols, a porous oxide material with voids accounting for at least 99% of the material’s volume. Among the lightest materials known, this aerosol is produced by hot pressing above the liquid’s critical point