An intumescent metamaterial is a material that can expand or contract in volume by adjusting its structure and composition . Naturally porous materials with unique pore structures and chemical compositions can be used as substrates for intumescent metamaterials. This paper introduces the application of the dual gradient structure of natural porous materials in the design of intumescent metamaterials, including its principle, preparation method and future development direction.
Metamaterials are a class of materials with special structures and properties, which can control electromagnetic waves, sound waves and other fluctuations by adjusting their microstructure. Intumescent metamaterials can achieve volume expansion or contraction under external stimuli through the adjustment of microstructure, and have a wide range of application potentials. Naturally porous materials are important research objects in the design of intumescent metamaterials due to their pore structure and ease of handling.
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