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In this study, different amounts of cinnamomum essential oil (CEO) were encapsulated in chitosan nanoparticles (NPs) (CS-NPs) through oil-in-water emulsification and ionic gelation. An ultraviolet-visible spectrophotometer, Fourier-transform infrared spectroscopy, synchronous thermal analysis, and X-ray diffraction were employed to analyze the CEO encapsulation. As observed by field-emission scanning electron microscopy, NP size analysis and zeta potential, the prepared CS-NPs, containing CEO (CS-CEO), were spherical with uniformly distributed sizes (diameters: 190–340 nm). The ranges of encapsulation efficiency (EE) and loading capacity (LC) were 4.6–32.9% and 0.9–10.4%, with variations in the starting weight ratio of CEO to CS from 0.11 to 0.53 (w/w). It was also found that the antioxidant activity of the CS-NPs loaded with CEO increased as the EE increased. The active ingredients of the CEO were prevented from being volatilized, significantly improving the chemical stability. The antioxidant activity of CS-CEO was higher than that of the free CEO. These results indicate the promising potential of CS-CEO as an antioxidant for food processing, and packaging applications.

Silk was used as the template to prepare biomorphic Al 2 O 3 fibers. Silk fibers were first immersed into an AlCl 3 solution and then sintered at high temperatures to produce the final Al 2 O 3 fibers. Their microstructures, phases, synthesis process, infrared absorption spectra, and thermal conductivity were analyzed. The results show that these Al 2 O 3 fibers retained the morphologies of silk. Different from the traditional Al 2 O 3 fibers, these biomorphic fibers exhibit hollow and possess a good ability of absorbing infrared got from the silk, so that they possessed better heat-insulating property than the traditional Al 2 O 3 fibers.

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