Facile Preparation of a Novel HfC Aerogel with Low Thermal Conductivity and Excellent Mechanical Properties.

As indicated in Table 1 , the bulk densities of the aerogels exhibit a decreasing trend with increasing Hf/R molar ratios, with the HfC aerogel achieving an impressively low bulk density of 0.37 g/cm 3 (C6).

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Furthermore, it is noteworthy that the specific surface areas exhibit an increasing trend as the Hf/R molar ratio increases.

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Table 2 reveals an interesting trend: as the molar ratio of Hf/R increases, the gelation time decreases.

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