Fabric-based infrared (IR) stealth composites with thermal insulation and low emissivity are desirable for improving IR camouflage of military targets and thermal management of special environments. Therefore, a flexible and foldable composite fabric with a sandwich structure is delicate designed in this work aiming to realize dual-modes IR effects. Polyester fabric chemically plated with copper-nickel (Cu/Ni@PF) and aluminum foil (AF) are on the top and bottom, respectively, acting as low emissivity layers. The medium layer is constructed by silica aerogel microspheres (SAM) with thickeners and waterborne polyurethanes (WPU) functioned as thermal insulation. The thermal conductivity of as-prepared composite fabric is only 0.05904 W/(m·K). When the AF is heated to 70 °C, the introduction of the SAM in the medium layer with the thickness of 300 μm makes Cu/Ni@PF as top surface exhibit a obvious temperature difference of 11.7 °C, demonstrating excellent thermal insulation. The AF maintains a low emissivity of less than 0.2, and the emissivity of Cu/Ni@PF was also as low as 0.296 at 8–14 μm, which can effectively shield the IR signal. Thanks to the Cu/Ni@PF as the top surface, the radiation temperature displays only 36.3 °C when heated at 70 °C, which meaning the dramatic IR signal strength reduce. Therefore, this dual-modes flexible and foldable composite can be a potential candidate in the IR stealth fields.

中文翻译：

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可折叠三明治织物复合材料具有隔热和低发射率，可实现高效红外隐形


具有隔热和低发射率的基于织物的红外（IR）隐形复合材料非常适合改善军事目标的红外伪装和特殊环境的热管理。因此，本工作精心设计了一种具有三明治结构的柔性可折叠复合织物，旨在实现双模红外效果。化学镀铜镍（Cu/Ni@PF）和铝箔（AF）的聚酯织物分别位于顶部和底部，作为低发射率层。中间层由二氧化硅气凝胶微球（SAM）与增稠剂和起隔热作用的水性聚氨酯（WPU）构成。所制备的复合织物的导热系数仅为0.05904 W/(m·K)。当AF加热到70℃时，在厚度为300μm的介质层中引入SAM使得Cu/Ni@PF作为顶面表现出11.7℃的明显温差，表现出优异的隔热性。 AF保持低于0.2的低发射率，Cu/Ni@PF在8-14μm处的发射率也低至0.296，可以有效屏蔽红外信号。由于Cu/Ni@PF作为顶面，当加热到70°C时，辐射温度仅为36.3°C，这意味着红外信号强度急剧降低。因此，这种双模柔性可折叠复合材料可以成为红外隐形领域的潜在候选者。