Al₂O₃/SnO₂ Co‐Nanoparticle Modified Grafted Collagen for Improving Thermal Stability and Infrared Emissivity

Abstract

Al 2 O 3 /SnO 2 co-nanoparticles were prepared with a modified sol-gel technique followed by a thermal treatment process. With these co-nanoparticles the grafted collagen-Al 2 O 3 /SnO 2 nanocomposites were obtained using a supersonic dispersion method. X-ray diffraction, FT-IR analysis, transmission electron microscopy, TGA/DTA and infrared emissivity test were performed to characterize the resulting nanoparticles and nanocomposites, respectively. The Al 2 O 3 /SnO 2 co-nanoparticles showed a narrow distribution of size between 20-40 nm and could be uniformly absorbed on the tri-helix scaffolds of the grafted collagen without any aggregation. The nanocomposites possessed better thermal stability and substantially lower infrared emissivity than the grafted collagen and Al 2 O 3 /SnO 2 co-nanoparticles with an increase of degradation temperature from 39 to 210 ℃ and a decrease of infrared emissivity from 0.850 of the grafted collagen and 0.708 of the Al 2 O 3 /SnO 2 co-nanoparticles to 0.424, which provided a potential application of the nanocomposites to areas such as photoelectronics.

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