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Organic phase change materials (PCMs) have great potential in thermal protection applications but they suffer from high volumetric change and easy leakage, which require "leak-proof" packaging materials with low thermal conductivity. Herein, we successfully modify SiO 2 through a simple 2-step method consisting of n-hexane activation followed by short-chain alkane silanization. The modified SiO 2 (M-SiO 2 ) exhibits superior hydrophobic property while maintaining the intrinsic high porosity of SiO 2 . The surface modification significantly improves the absorption rate of RT60 in SiO 2 by 38%. The M-SiO 2 /RT60 composite shows high latent heat of 180 J·g -1 , low thermal conductivity of 0.178 W·m -1 ·K -1 , and great heat capacity behavior in a high-power thermal circuit with low penetrated heating flow. Our results provide a simple approach for preparing hydrophobic SiO 2 with high absorption of organic PCM for thermal protection applications.

Short-Chain Modified SiO2 with High Absorption of Organic PCM for Thermal Protection