Double-Shelled Yolk–Shell Microspheres with Fe₃O₄ Cores and SnO₂ Double Shells as High-Performance Microwave Absorbers

Double-shelled yolk–shell microspheres with Fe₃O₄ cores and SnO₂ double shells have been successfully synthesized by combining the versatile sol–gel process and hydrothermal shell-by-shell deposition method. The as-synthesized double-shelled Fe₃O₄@SnO₂ yolk–shell microspheres have uniform size, unique morphology, well-defined shells, favorable magnetization, large specific surface area, and high porosity and exhibit significantly enhanced microwave absorption properties in terms of both the maximum reflection loss value and the absorption bandwidth. The excellent microwave absorption properties of these microspheres may be attributed to the unique double-shelled yolk–shell structure and synergistic effect between the magnetic Fe₃O₄ cores and dielectric SnO₂ shells

Synthesis and Microwave Absorption Properties of Yolk–Shell Microspheres with Magnetic Iron Oxide Cores and Hierarchical Copper Silicate Shells

Yolk–shell microspheres with magnetic Fe₃O₄ cores and hierarchical copper silicate shells have been successfully synthesized by combining the versatile sol–gel process and hydrothermal reaction. Various yolk–shell microspheres with different core size and shell thickness can be readily synthesized by varying the experimental conditions. Compared to pure Fe₃O₄, the as-synthesized yolk–shell microspheres exhibit significantly enhanced microwave absorption properties in terms of both the maximum reflection loss value and the absorption bandwidth. The maximum reflection loss value of these yolk–shell microspheres can reach −23.5 dB at 7 GHz with a thickness of 2 mm, and the absorption bandwidths with reflection loss lower than −10 dB are up to 10.4 GHz. Owing to the large specific surface area, high porosity, and synergistic effect of both the magnetic Fe₃O₄ cores and hierarchical copper silicate shells, these unique yolk–shell microspheres may have the potential as high-efficient absorbers for microwave absorption applications

Ultrathin BaTiO₃ Nanowires with High Aspect Ratio: A Simple One-Step Hydrothermal Synthesis and Their Strong Microwave Absorption

In this paper, we report the facile synthesis of ultrathin barium titanate (BaTiO₃) nanowires with gram-level yield via a simple one-step hydrothermal treatment. Our BaTiO₃ nanowires have unique features: single crystalline, uniform size distribution and ultra high aspect ratio. The synergistic effects including both Ostwald ripening and cation exchange reaction are responsible for the growth of the ultrathin BaTiO₃ nanowires. The microwave absorption capability of the ultrathin BaTiO₃ nanowires is improved compared to that of BaTiO₃ nanotorus, with a maximum reflection loss as high as −24.6 dB at 9.04 GHz and an absorption bandwidth of 2.4 GHz (<−10 dB). Our method has some novel advantages: simple, facile, low cost and high synthesis yield, which might be developed to prepare other ferroelectric nanostructures. The strong microwave absorption property of the ultrathin BaTiO₃ nanowires indicates that these nanowires could be used as promising materials for microwave-absorption and stealth camouflage techniques

Additional file 1 of Preoperative splenic area as a prognostic biomarker of early-stage non-small cell lung cancer

Supplementary Material 1: Calculation of the splenic area: After definition of the patients cross-sectionally (panel 1), we used a signal intensity-based threshold approach (1 to 100 HU) to identify the area of the spleen (red, panel 2), a 57-year-old female in the abnormal group; splenic area: 747 cm2 (a), a 67-year-old female in the abnormal group; splenic area: 16.3 cm2 (b), a 77-year-old female in the normal group; splenic area: 30.01 cm2 (c)