The invention relates to a method for manufacturing an airgel of silicon nanowires, comprising at least the steps consisting in (i) having a dispersion of silicon nanowires in an aqueous, alcoholic or hydroalcoholic solvent medium; and (ii) removing said solvent medium by drying under conditions conducive to the formation of an airgel. It also relates to an airgel of silicon nanowires and its implementation for the preparation of an airgel of nanowires based on silica, as well as the use of such aerogels of nanowires based on silica for the manufacture of insulation products. thermal and / or phonic; catalyst supports or also as reinforcing fillers for the preparation of a lightweight composite material.
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